| Config - access Perl configuration information |
Config - access Perl configuration information
use Config;
if ($Config{usethreads}) {
print "has thread support\n"
}
use Config qw(myconfig config_sh config_vars config_re);
print myconfig();
print config_sh();
print config_re();
config_vars(qw(osname archname));
The Config module contains all the information that was available to
the Configure program at Perl build time (over 900 values).
Shell variables from the config.sh file (written by Configure) are
stored in the readonly-variable %Config, indexed by their names.
Values stored in config.sh as 'undef' are returned as undefined
values. The perl exists function can be used to check if a
named variable exists.
myconfig()-V in Switches in the perlrun manpage.
config_sh()config_re($regex)config_sh() but returns, as a list, only the config entries who's
names match the $regex.
config_vars(@names)name='value';
Names which are unknown are output as name='UNKNOWN';.
See also -V:name in Switches in the perlrun manpage.
Here's a more sophisticated example of using %Config:
use Config;
use strict;
my %sig_num;
my @sig_name;
unless($Config{sig_name} && $Config{sig_num}) {
die "No sigs?";
} else {
my @names = split ' ', $Config{sig_name};
@sig_num{@names} = split ' ', $Config{sig_num};
foreach (@names) {
$sig_name[$sig_num{$_}] ||= $_;
}
}
print "signal #17 = $sig_name[17]\n";
if ($sig_num{ALRM}) {
print "SIGALRM is $sig_num{ALRM}\n";
}
Because this information is not stored within the perl executable itself it is possible (but unlikely) that the information does not relate to the actual perl binary which is being used to access it.
The Config module is installed into the architecture and version specific library directory ($Config{installarchlib}) and it checks the perl version number when loaded.
The values stored in config.sh may be either single-quoted or
double-quoted. Double-quoted strings are handy for those cases where you
need to include escape sequences in the strings. To avoid runtime variable
interpolation, any $ and @ characters are replaced by \$ and
\@, respectively. This isn't foolproof, of course, so don't embed \$
or \@ in double-quoted strings unless you're willing to deal with the
consequences. (The slashes will end up escaped and the $ or @ will
trigger variable interpolation)
Most Config variables are determined by the Configure script
on platforms supported by it (which is most UNIX platforms). Some
platforms have custom-made Config variables, and may thus not have
some of the variables described below, or may have extraneous variables
specific to that particular port. See the port specific documentation
in such cases.
_aThis variable defines the extension used for ordinary library files. For unix, it is .a. The . is included. Other possible values include .lib.
_exeThis variable defines the extension used for executable files.
DJGPP, Cygwin and OS/2 use .exe. Stratus VOS uses .pm.
On operating systems which do not require a specific extension
for executable files, this variable is empty.
_oThis variable defines the extension used for object files. For unix, it is .o. The . is included. Other possible values include .obj.
afsThis variable is set to true if AFS (Andrew File System) is used
on the system, false otherwise. It is possible to override this
with a hint value or command line option, but you'd better know
what you are doing.
afsrootThis variable is by default set to /afs. In the unlikely case this is not the correct root, it is possible to override this with a hint value or command line option. This will be used in subsequent tests for AFSness in the Perl configure and test process.
alignbytesThis variable holds the number of bytes required to align a double-- or a long double when applicable. Usual values are 2, 4 and 8. The default is eight, for safety.
ansi2knrThis variable is set if the user needs to run ansi2knr. Currently, this is not supported, so we just abort.
aphostnameThis variable contains the command which can be used to compute the host name. The command is fully qualified by its absolute path, to make it safe when used by a process with super-user privileges.
api_revisionThe three variables, api_revision, api_version, and
api_subversion, specify the version of the oldest perl binary
compatible with the present perl. In a full version string
such as 5.6.1, api_revision is the 5.
Prior to 5.5.640, the format was a floating point number,
like 5.00563.
perl.c:incpush() and lib/lib.pm will automatically search in
$sitelib/.. for older directories back to the limit specified
by these api_ variables. This is only useful if you have a
perl library directory tree structured like the default one.
See INSTALL for how this works. The versioned site_perl
directory was introduced in 5.005, so that is the lowest
possible value. The version list appropriate for the current
system is determined in inc_version_list.U.
XXX To do: Since compatibility can depend on compile time
options (such as bincompat, longlong, etc.) it should
(perhaps) be set by Configure, but currently it isn't.
Currently, we read a hard-wired value from patchlevel.h.
Perhaps what we ought to do is take the hard-wired value from
patchlevel.h but then modify it if the current Configure
options warrant. patchlevel.h then would use an #ifdef guard.
api_subversionThe three variables, api_revision, api_version, and
api_subversion, specify the version of the oldest perl binary
compatible with the present perl. In a full version string
such as 5.6.1, api_subversion is the 1. See api_revision for
full details.
api_versionThe three variables, api_revision, api_version, and
api_subversion, specify the version of the oldest perl binary
compatible with the present perl. In a full version string
such as 5.6.1, api_version is the 6. See api_revision for
full details. As a special case, 5.5.0 is rendered in the
old-style as 5.005. (In the 5.005_0x maintenance series,
this was the only versioned directory in $sitelib.)
api_versionstringThis variable combines api_revision, api_version, and api_subversion in a format such as 5.6.1 (or 5_6_1) suitable for use as a directory name. This is filesystem dependent.
arThis variable is used internally by Configure to determine the
full pathname (if any) of the ar program. After Configure runs,
the value is reset to a plain ar and is not useful.
archlibThis variable holds the name of the directory in which the user wants to put architecture-dependent public library files for $package. It is most often a local directory such as /usr/local/lib. Programs using this variable must be prepared to deal with filename expansion.
archlibexpThis variable is the same as the archlib variable, but is filename expanded at configuration time, for convenient use.
archname64This variable is used for the 64-bitness part of $archname.
archnameThis variable is a short name to characterize the current architecture. It is used mainly to construct the default archlib.
archobjsThis variable defines any additional objects that must be linked in with the program on this architecture. On unix, it is usually empty. It is typically used to include emulations of unix calls or other facilities. For perl on OS/2, for example, this would include os2/os2.obj.
asctime_r_protoThis variable encodes the prototype of asctime_r.
It is zero if d_asctime_r is undef, and one of the
REENTRANT_PROTO_T_ABC macros of reentr.h if d_asctime_r
is defined.
awkThis variable is used internally by Configure to determine the
full pathname (if any) of the awk program. After Configure runs,
the value is reset to a plain awk and is not useful.
baserevThe base revision level of this package, from the .package file.
bashThis variable is defined but not used by Configure. The value is a plain '' and is not useful.
binThis variable holds the name of the directory in which the user wants to put publicly executable images for the package in question. It is most often a local directory such as /usr/local/bin. Programs using this variable must be prepared to deal with ~name substitution.
binexpThis is the same as the bin variable, but is filename expanded at configuration time, for use in your makefiles.
bisonThis variable is used internally by Configure to determine the
full pathname (if any) of the bison program. After Configure runs,
the value is reset to a plain bison and is not useful.
byaccThis variable is used internally by Configure to determine the
full pathname (if any) of the byacc program. After Configure runs,
the value is reset to a plain byacc and is not useful.
byteorderThis variable holds the byte order in a UV. In the following,
larger digits indicate more significance. The variable byteorder
is either 4321 on a big-endian machine, or 1234 on a little-endian,
or 87654321 on a Cray ... or 3412 with weird order !
cThis variable contains the \c string if that is what causes the echo command to suppress newline. Otherwise it is null. Correct usage is $echo $n ``prompt for a question: $c''.
castflagsThis variable contains a flag that precise difficulties the compiler has casting odd floating values to unsigned long: 0 = ok 1 = couldn't cast < 0 2 = couldn't cast >= 0x80000000 4 = couldn't cast in argument expression list
catThis variable is used internally by Configure to determine the
full pathname (if any) of the cat program. After Configure runs,
the value is reset to a plain cat and is not useful.
ccThis variable holds the name of a command to execute a C compiler which
can resolve multiple global references that happen to have the same
name. Usual values are cc and gcc.
Fervent ANSI compilers may be called c89. AIX has xlc.
cccdlflagsThis variable contains any special flags that might need to be
passed with cc -c to compile modules to be used to create a shared
library that will be used for dynamic loading. For hpux, this
should be +z. It is up to the makefile to use it.
ccdlflagsThis variable contains any special flags that might need to be passed to cc to link with a shared library for dynamic loading. It is up to the makefile to use it. For sunos 4.1, it should be empty.
ccflagsThis variable contains any additional C compiler flags desired by the user. It is up to the Makefile to use this.
ccflags_uselargefilesThis variable contains the compiler flags needed by large file builds and added to ccflags by hints files.
ccnameThis can set either by hints files or by Configure. If using
gcc, this is gcc, and if not, usually equal to cc, unimpressive, no?
Some platforms, however, make good use of this by storing the
flavor of the C compiler being used here. For example if using
the Sun WorkShop suite, ccname will be workshop.
ccsymbolsThe variable contains the symbols defined by the C compiler alone. The symbols defined by cpp or by cc when it calls cpp are not in this list, see cppsymbols and cppccsymbols. The list is a space-separated list of symbol=value tokens.
ccversionThis can set either by hints files or by Configure. If using a (non-gcc) vendor cc, this variable may contain a version for the compiler.
cf_byLogin name of the person who ran the Configure script and answered the questions. This is used to tag both config.sh and config_h.SH.
cf_emailElectronic mail address of the person who ran Configure. This can be used by units that require the user's e-mail, like MailList.U.
cf_timeHolds the output of the date command when the configuration file was
produced. This is used to tag both config.sh and config_h.SH.
charsizeThis variable contains the value of the CHARSIZE symbol, which
indicates to the C program how many bytes there are in a character.
chgrpThis variable is defined but not used by Configure. The value is a plain '' and is not useful.
chmodThis variable is used internally by Configure to determine the
full pathname (if any) of the chmod program. After Configure runs,
the value is reset to a plain chmod and is not useful.
chownThis variable is defined but not used by Configure. The value is a plain '' and is not useful.
clocktypeThis variable holds the type returned by times(). It can be long,
or clock_t on BSD sites (in which case <sys/types.h> should be
included).
commThis variable is used internally by Configure to determine the
full pathname (if any) of the comm program. After Configure runs,
the value is reset to a plain comm and is not useful.
compressThis variable is defined but not used by Configure. The value is a plain '' and is not useful.
containsThis variable holds the command to do a grep with a proper return
status. On most sane systems it is simply grep. On insane systems
it is a grep followed by a cat followed by a test. This variable
is primarily for the use of other Configure units.
cpThis variable is used internally by Configure to determine the
full pathname (if any) of the cp program. After Configure runs,
the value is reset to a plain cp and is not useful.
cpioThis variable is defined but not used by Configure. The value is a plain '' and is not useful.
cppThis variable is used internally by Configure to determine the
full pathname (if any) of the cpp program. After Configure runs,
the value is reset to a plain cpp and is not useful.
cpp_stuffThis variable contains an identification of the concatenation mechanism used by the C preprocessor.
cppccsymbolsThe variable contains the symbols defined by the C compiler when it calls cpp. The symbols defined by the cc alone or cpp alone are not in this list, see ccsymbols and cppsymbols. The list is a space-separated list of symbol=value tokens.
cppflagsThis variable holds the flags that will be passed to the C pre- processor. It is up to the Makefile to use it.
cpplastThis variable has the same functionality as cppminus, only it applies to cpprun and not cppstdin.
cppminusThis variable contains the second part of the string which will invoke
the C preprocessor on the standard input and produce to standard
output. This variable will have the value - if cppstdin needs
a minus to specify standard input, otherwise the value is ``''.
cpprunThis variable contains the command which will invoke a C preprocessor on standard input and put the output to stdout. It is guaranteed not to be a wrapper and may be a null string if no preprocessor can be made directly available. This preprocessor might be different from the one used by the C compiler. Don't forget to append cpplast after the preprocessor options.
cppstdinThis variable contains the command which will invoke the C preprocessor on standard input and put the output to stdout. It is primarily used by other Configure units that ask about preprocessor symbols.
cppsymbolsThe variable contains the symbols defined by the C preprocessor alone. The symbols defined by cc or by cc when it calls cpp are not in this list, see ccsymbols and cppccsymbols. The list is a space-separated list of symbol=value tokens.
crypt_r_protoThis variable encodes the prototype of crypt_r.
It is zero if d_crypt_r is undef, and one of the
REENTRANT_PROTO_T_ABC macros of reentr.h if d_crypt_r
is defined.
cryptlibThis variable holds -lcrypt or the path to a libcrypt.a archive if
the crypt() function is not defined in the standard C library. It is
up to the Makefile to use this.
cshThis variable is used internally by Configure to determine the
full pathname (if any) of the csh program. After Configure runs,
the value is reset to a plain csh and is not useful.
ctermid_r_protoThis variable encodes the prototype of ctermid_r.
It is zero if d_ctermid_r is undef, and one of the
REENTRANT_PROTO_T_ABC macros of reentr.h if d_ctermid_r
is defined.
ctime_r_protoThis variable encodes the prototype of ctime_r.
It is zero if d_ctime_r is undef, and one of the
REENTRANT_PROTO_T_ABC macros of reentr.h if d_ctime_r
is defined.
d__fwalkThis variable conditionally defines HAS__FWALK if _fwalk() is
available to apply a function to all the file handles.
d_accessThis variable conditionally defines HAS_ACCESS if the access() system
call is available to check for access permissions using real IDs.
d_accessxThis variable conditionally defines the HAS_ACCESSX symbol, which
indicates to the C program that the accessx() routine is available.
d_aintlThis variable conditionally defines the HAS_AINTL symbol, which
indicates to the C program that the aintl() routine is available.
If copysignl is also present we can emulate modfl.
d_alarmThis variable conditionally defines the HAS_ALARM symbol, which
indicates to the C program that the alarm() routine is available.
d_archlibThis variable conditionally defines ARCHLIB to hold the pathname
of architecture-dependent library files for $package. If
$archlib is the same as $privlib, then this is set to undef.
d_asctime_rThis variable conditionally defines the HAS_ASCTIME_R symbol,
which indicates to the C program that the asctime_r()
routine is available.
d_atolfThis variable conditionally defines the HAS_ATOLF symbol, which
indicates to the C program that the atolf() routine is available.
d_atollThis variable conditionally defines the HAS_ATOLL symbol, which
indicates to the C program that the atoll() routine is available.
d_attributThis variable conditionally defines HASATTRIBUTE, which
indicates the C compiler can check for function attributes,
such as printf formats.
d_bcmpThis variable conditionally defines the HAS_BCMP symbol if
the bcmp() routine is available to compare strings.
d_bcopyThis variable conditionally defines the HAS_BCOPY symbol if
the bcopy() routine is available to copy strings.
d_bsdThis symbol conditionally defines the symbol BSD when running on a
BSD system.
d_bsdgetpgrpThis variable conditionally defines USE_BSD_GETPGRP if
getpgrp needs one arguments whereas USG one needs none.
d_bsdsetpgrpThis variable conditionally defines USE_BSD_SETPGRP if
setpgrp needs two arguments whereas USG one needs none.
See also d_setpgid for a POSIX interface.
d_bzeroThis variable conditionally defines the HAS_BZERO symbol if
the bzero() routine is available to set memory to 0.
d_casti32This variable conditionally defines CASTI32, which indicates whether the C compiler can cast large floats to 32-bit ints.
d_castnegThis variable conditionally defines CASTNEG, which indicates
wether the C compiler can cast negative float to unsigned.
d_charvsprThis variable conditionally defines CHARVSPRINTF if this system
has vsprintf returning type (char*). The trend seems to be to
declare it as ``int vsprintf()''.
d_chownThis variable conditionally defines the HAS_CHOWN symbol, which
indicates to the C program that the chown() routine is available.
d_chrootThis variable conditionally defines the HAS_CHROOT symbol, which
indicates to the C program that the chroot() routine is available.
d_chsizeThis variable conditionally defines the CHSIZE symbol, which
indicates to the C program that the chsize() routine is available
to truncate files. You might need a -lx to get this routine.
d_classThis variable conditionally defines the HAS_CLASS symbol, which
indicates to the C program that the class() routine is available.
d_closedirThis variable conditionally defines HAS_CLOSEDIR if closedir() is
available.
d_cmsghdr_sThis variable conditionally defines the HAS_STRUCT_CMSGHDR symbol,
which indicates that the struct cmsghdr is supported.
d_constThis variable conditionally defines the HASCONST symbol, which
indicates to the C program that this C compiler knows about the
const type.
d_copysignlThis variable conditionally defines the HAS_COPYSIGNL symbol, which
indicates to the C program that the copysignl() routine is available.
If aintl is also present we can emulate modfl.
d_cryptThis variable conditionally defines the CRYPT symbol, which
indicates to the C program that the crypt() routine is available
to encrypt passwords and the like.
d_crypt_rThis variable conditionally defines the HAS_CRYPT_R symbol,
which indicates to the C program that the crypt_r()
routine is available.
d_cshThis variable conditionally defines the CSH symbol, which
indicates to the C program that the C-shell exists.
d_ctermid_rThis variable conditionally defines the HAS_CTERMID_R symbol,
which indicates to the C program that the ctermid_r()
routine is available.
d_ctime_rThis variable conditionally defines the HAS_CTIME_R symbol,
which indicates to the C program that the ctime_r()
routine is available.
d_cuseridThis variable conditionally defines the HAS_CUSERID symbol, which
indicates to the C program that the cuserid() routine is available
to get character login names.
d_dbl_digThis variable conditionally defines d_dbl_dig if this system's
header files provide DBL_DIG, which is the number of significant
digits in a double precision number.
d_dbminitprotoThis variable conditionally defines the HAS_DBMINIT_PROTO symbol,
which indicates to the C program that the system provides
a prototype for the dbminit() function. Otherwise, it is
up to the program to supply one.
d_difftimeThis variable conditionally defines the HAS_DIFFTIME symbol, which
indicates to the C program that the difftime() routine is available.
d_dirfdThis variable conditionally defines the HAS_DIRFD constant,
which indicates to the C program that dirfd() is available
to return the file descriptor of a directory stream.
d_dirnamlenThis variable conditionally defines DIRNAMLEN, which indicates
to the C program that the length of directory entry names is
provided by a d_namelen field.
d_dlerrorThis variable conditionally defines the HAS_DLERROR symbol, which
indicates to the C program that the dlerror() routine is available.
d_dlopenThis variable conditionally defines the HAS_DLOPEN symbol, which
indicates to the C program that the dlopen() routine is available.
d_dlsymunThis variable conditionally defines DLSYM_NEEDS_UNDERSCORE, which
indicates that we need to prepend an underscore to the symbol
name before calling dlsym().
d_dosuidThis variable conditionally defines the symbol DOSUID, which
tells the C program that it should insert setuid emulation code
on hosts which have setuid #! scripts disabled.
d_drand48_rThis variable conditionally defines the HAS_DRAND48_R symbol,
which indicates to the C program that the drand48_r()
routine is available.
d_drand48protoThis variable conditionally defines the HAS_DRAND48_PROTO symbol,
which indicates to the C program that the system provides
a prototype for the drand48() function. Otherwise, it is
up to the program to supply one.
d_dup2This variable conditionally defines HAS_DUP2 if dup2() is
available to duplicate file descriptors.
d_eaccessThis variable conditionally defines the HAS_EACCESS symbol, which
indicates to the C program that the eaccess() routine is available.
d_endgrentThis variable conditionally defines the HAS_ENDGRENT symbol, which
indicates to the C program that the endgrent() routine is available
for sequential access of the group database.
d_endgrent_rThis variable conditionally defines the HAS_ENDGRENT_R symbol,
which indicates to the C program that the endgrent_r()
routine is available.
d_endhentThis variable conditionally defines HAS_ENDHOSTENT if endhostent() is
available to close whatever was being used for host queries.
d_endhostent_rThis variable conditionally defines the HAS_ENDHOSTENT_R symbol,
which indicates to the C program that the endhostent_r()
routine is available.
d_endnentThis variable conditionally defines HAS_ENDNETENT if endnetent() is
available to close whatever was being used for network queries.
d_endnetent_rThis variable conditionally defines the HAS_ENDNETENT_R symbol,
which indicates to the C program that the endnetent_r()
routine is available.
d_endpentThis variable conditionally defines HAS_ENDPROTOENT if endprotoent() is
available to close whatever was being used for protocol queries.
d_endprotoent_rThis variable conditionally defines the HAS_ENDPROTOENT_R symbol,
which indicates to the C program that the endprotoent_r()
routine is available.
d_endpwentThis variable conditionally defines the HAS_ENDPWENT symbol, which
indicates to the C program that the endpwent() routine is available
for sequential access of the passwd database.
d_endpwent_rThis variable conditionally defines the HAS_ENDPWENT_R symbol,
which indicates to the C program that the endpwent_r()
routine is available.
d_endsentThis variable conditionally defines HAS_ENDSERVENT if endservent() is
available to close whatever was being used for service queries.
d_endservent_rThis variable conditionally defines the HAS_ENDSERVENT_R symbol,
which indicates to the C program that the endservent_r()
routine is available.
d_eofnblkThis variable conditionally defines EOF_NONBLOCK if EOF can be seen
when reading from a non-blocking I/O source.
d_euniceThis variable conditionally defines the symbols EUNICE and VAX, which
alerts the C program that it must deal with ideosyncracies of VMS.
d_faststdioThis variable conditionally defines the HAS_FAST_STDIO symbol,
which indicates to the C program that the ``fast stdio'' is available
to manipulate the stdio buffers directly.
d_fchdirThis variable conditionally defines the HAS_FCHDIR symbol, which
indicates to the C program that the fchdir() routine is available.
d_fchmodThis variable conditionally defines the HAS_FCHMOD symbol, which
indicates to the C program that the fchmod() routine is available
to change mode of opened files.
d_fchownThis variable conditionally defines the HAS_FCHOWN symbol, which
indicates to the C program that the fchown() routine is available
to change ownership of opened files.
d_fcntlThis variable conditionally defines the HAS_FCNTL symbol, and indicates
whether the fcntl() function exists
d_fcntl_can_lockThis variable conditionally defines the FCNTL_CAN_LOCK symbol
and indicates whether file locking with fcntl() works.
d_fd_macrosThis variable contains the eventual value of the HAS_FD_MACROS symbol,
which indicates if your C compiler knows about the macros which
manipulate an fd_set.
d_fd_setThis variable contains the eventual value of the HAS_FD_SET symbol,
which indicates if your C compiler knows about the fd_set typedef.
d_fds_bitsThis variable contains the eventual value of the HAS_FDS_BITS symbol,
which indicates if your fd_set typedef contains the fds_bits member.
If you have an fd_set typedef, but the dweebs who installed it did
a half-fast job and neglected to provide the macros to manipulate
an fd_set, HAS_FDS_BITS will let us know how to fix the gaffe.
d_fgetposThis variable conditionally defines HAS_FGETPOS if fgetpos() is
available to get the file position indicator.
d_finiteThis variable conditionally defines the HAS_FINITE symbol, which
indicates to the C program that the finite() routine is available.
d_finitelThis variable conditionally defines the HAS_FINITEL symbol, which
indicates to the C program that the finitel() routine is available.
d_flexfnamThis variable conditionally defines the FLEXFILENAMES symbol, which
indicates that the system supports filenames longer than 14 characters.
d_flockThis variable conditionally defines HAS_FLOCK if flock() is
available to do file locking.
d_flockprotoThis variable conditionally defines the HAS_FLOCK_PROTO symbol,
which indicates to the C program that the system provides
a prototype for the flock() function. Otherwise, it is
up to the program to supply one.
d_forkThis variable conditionally defines the HAS_FORK symbol, which
indicates to the C program that the fork() routine is available.
d_fp_classThis variable conditionally defines the HAS_FP_CLASS symbol, which
indicates to the C program that the fp_class() routine is available.
d_fpathconfThis variable conditionally defines the HAS_FPATHCONF symbol, which
indicates to the C program that the pathconf() routine is available
to determine file-system related limits and options associated
with a given open file descriptor.
d_fpclassThis variable conditionally defines the HAS_FPCLASS symbol, which
indicates to the C program that the fpclass() routine is available.
d_fpclassifyThis variable conditionally defines the HAS_FPCLASSIFY symbol, which
indicates to the C program that the fpclassify() routine is available.
d_fpclasslThis variable conditionally defines the HAS_FPCLASSL symbol, which
indicates to the C program that the fpclassl() routine is available.
d_fpos64_tThis symbol will be defined if the C compiler supports fpos64_t.
d_frexplThis variable conditionally defines the HAS_FREXPL symbol, which
indicates to the C program that the frexpl() routine is available.
d_fs_data_sThis variable conditionally defines the HAS_STRUCT_FS_DATA symbol,
which indicates that the struct fs_data is supported.
d_fseekoThis variable conditionally defines the HAS_FSEEKO symbol, which
indicates to the C program that the fseeko() routine is available.
d_fsetposThis variable conditionally defines HAS_FSETPOS if fsetpos() is
available to set the file position indicator.
d_fstatfsThis variable conditionally defines the HAS_FSTATFS symbol, which
indicates to the C program that the fstatfs() routine is available.
d_fstatvfsThis variable conditionally defines the HAS_FSTATVFS symbol, which
indicates to the C program that the fstatvfs() routine is available.
d_fsyncThis variable conditionally defines the HAS_FSYNC symbol, which
indicates to the C program that the fsync() routine is available.
d_ftelloThis variable conditionally defines the HAS_FTELLO symbol, which
indicates to the C program that the ftello() routine is available.
d_ftimeThis variable conditionally defines the HAS_FTIME symbol, which indicates
that the ftime() routine exists. The ftime() routine is basically
a sub-second accuracy clock.
d_GconvertThis variable holds what Gconvert is defined as to convert
floating point numbers into strings. By default, Configure
sets this macro to use the first of gconvert, gcvt, or sprintf
that pass sprintf-%g-like behaviour tests. If perl is using
long doubles, the macro uses the first of the following
functions that pass Configure's tests: qgcvt, sprintf (if
Configure knows how to make sprintf format long doubles--see
sPRIgldbl), gconvert, gcvt, and sprintf (casting to double).
The gconvert_preference and gconvert_ld_preference variables
can be used to alter Configure's preferences, for doubles and
long doubles, respectively. If present, they contain a
space-separated list of one or more of the above function
names in the order they should be tried.
d_Gconvert may be set to override Configure with a platform- specific function. If this function expects a double, a different value may need to be set by the uselongdouble.cbu call-back unit so that long doubles can be formatted without loss of precision.
d_getcwdThis variable conditionally defines the HAS_GETCWD symbol, which
indicates to the C program that the getcwd() routine is available
to get the current working directory.
d_getespwnamThis variable conditionally defines HAS_GETESPWNAM if getespwnam() is
available to retrieve enchanced (shadow) password entries by name.
d_getfsstatThis variable conditionally defines the HAS_GETFSSTAT symbol, which
indicates to the C program that the getfsstat() routine is available.
d_getgrentThis variable conditionally defines the HAS_GETGRENT symbol, which
indicates to the C program that the getgrent() routine is available
for sequential access of the group database.
d_getgrent_rThis variable conditionally defines the HAS_GETGRENT_R symbol,
which indicates to the C program that the getgrent_r()
routine is available.
d_getgrgid_rThis variable conditionally defines the HAS_GETGRGID_R symbol,
which indicates to the C program that the getgrgid_r()
routine is available.
d_getgrnam_rThis variable conditionally defines the HAS_GETGRNAM_R symbol,
which indicates to the C program that the getgrnam_r()
routine is available.
d_getgrpsThis variable conditionally defines the HAS_GETGROUPS symbol, which
indicates to the C program that the getgroups() routine is available
to get the list of process groups.
d_gethbyaddrThis variable conditionally defines the HAS_GETHOSTBYADDR symbol, which
indicates to the C program that the gethostbyaddr() routine is available
to look up hosts by their IP addresses.
d_gethbynameThis variable conditionally defines the HAS_GETHOSTBYNAME symbol, which
indicates to the C program that the gethostbyname() routine is available
to look up host names in some data base or other.
d_gethentThis variable conditionally defines HAS_GETHOSTENT if gethostent() is
available to look up host names in some data base or another.
d_gethnameThis variable conditionally defines the HAS_GETHOSTNAME symbol, which
indicates to the C program that the gethostname() routine may be
used to derive the host name.
d_gethostbyaddr_rThis variable conditionally defines the HAS_GETHOSTBYADDR_R symbol,
which indicates to the C program that the gethostbyaddr_r()
routine is available.
d_gethostbyname_rThis variable conditionally defines the HAS_GETHOSTBYNAME_R symbol,
which indicates to the C program that the gethostbyname_r()
routine is available.
d_gethostent_rThis variable conditionally defines the HAS_GETHOSTENT_R symbol,
which indicates to the C program that the gethostent_r()
routine is available.
d_gethostprotosThis variable conditionally defines the HAS_GETHOST_PROTOS symbol,
which indicates to the C program that <netdb.h> supplies
prototypes for the various gethost*() functions.
See also netdbtype.U for probing for various netdb types.
d_getitimerThis variable conditionally defines the HAS_GETITIMER symbol, which
indicates to the C program that the getitimer() routine is available.
d_getloginThis variable conditionally defines the HAS_GETLOGIN symbol, which
indicates to the C program that the getlogin() routine is available
to get the login name.
d_getlogin_rThis variable conditionally defines the HAS_GETLOGIN_R symbol,
which indicates to the C program that the getlogin_r()
routine is available.
d_getmntThis variable conditionally defines the HAS_GETMNT symbol, which
indicates to the C program that the getmnt() routine is available
to retrieve one or more mount info blocks by filename.
d_getmntentThis variable conditionally defines the HAS_GETMNTENT symbol, which
indicates to the C program that the getmntent() routine is available
to iterate through mounted files to get their mount info.
d_getnbyaddrThis variable conditionally defines the HAS_GETNETBYADDR symbol, which
indicates to the C program that the getnetbyaddr() routine is available
to look up networks by their IP addresses.
d_getnbynameThis variable conditionally defines the HAS_GETNETBYNAME symbol, which
indicates to the C program that the getnetbyname() routine is available
to look up networks by their names.
d_getnentThis variable conditionally defines HAS_GETNETENT if getnetent() is
available to look up network names in some data base or another.
d_getnetbyaddr_rThis variable conditionally defines the HAS_GETNETBYADDR_R symbol,
which indicates to the C program that the getnetbyaddr_r()
routine is available.
d_getnetbyname_rThis variable conditionally defines the HAS_GETNETBYNAME_R symbol,
which indicates to the C program that the getnetbyname_r()
routine is available.
d_getnetent_rThis variable conditionally defines the HAS_GETNETENT_R symbol,
which indicates to the C program that the getnetent_r()
routine is available.
d_getnetprotosThis variable conditionally defines the HAS_GETNET_PROTOS symbol,
which indicates to the C program that <netdb.h> supplies
prototypes for the various getnet*() functions.
See also netdbtype.U for probing for various netdb types.
d_getpagszThis variable conditionally defines HAS_GETPAGESIZE if getpagesize()
is available to get the system page size.
d_getpbynameThis variable conditionally defines the HAS_GETPROTOBYNAME
symbol, which indicates to the C program that the
getprotobyname() routine is available to look up protocols
by their name.
d_getpbynumberThis variable conditionally defines the HAS_GETPROTOBYNUMBER
symbol, which indicates to the C program that the
getprotobynumber() routine is available to look up protocols
by their number.
d_getpentThis variable conditionally defines HAS_GETPROTOENT if getprotoent() is
available to look up protocols in some data base or another.
d_getpgidThis variable conditionally defines the HAS_GETPGID symbol, which
indicates to the C program that the getpgid(pid) function
is available to get the process group id.
d_getpgrp2This variable conditionally defines the HAS_GETPGRP2 symbol, which
indicates to the C program that the getpgrp2() (as in DG/UX) routine
is available to get the current process group.
d_getpgrpThis variable conditionally defines HAS_GETPGRP if getpgrp() is
available to get the current process group.
d_getppidThis variable conditionally defines the HAS_GETPPID symbol, which
indicates to the C program that the getppid() routine is available
to get the parent process ID.
d_getpriorThis variable conditionally defines HAS_GETPRIORITY if getpriority()
is available to get a process's priority.
d_getprotobyname_rThis variable conditionally defines the HAS_GETPROTOBYNAME_R symbol,
which indicates to the C program that the getprotobyname_r()
routine is available.
d_getprotobynumber_rThis variable conditionally defines the HAS_GETPROTOBYNUMBER_R symbol,
which indicates to the C program that the getprotobynumber_r()
routine is available.
d_getprotoent_rThis variable conditionally defines the HAS_GETPROTOENT_R symbol,
which indicates to the C program that the getprotoent_r()
routine is available.
d_getprotoprotosThis variable conditionally defines the HAS_GETPROTO_PROTOS symbol,
which indicates to the C program that <netdb.h> supplies
prototypes for the various getproto*() functions.
See also netdbtype.U for probing for various netdb types.
d_getprpwnamThis variable conditionally defines HAS_GETPRPWNAM if getprpwnam() is
available to retrieve protected (shadow) password entries by name.
d_getpwentThis variable conditionally defines the HAS_GETPWENT symbol, which
indicates to the C program that the getpwent() routine is available
for sequential access of the passwd database.
d_getpwent_rThis variable conditionally defines the HAS_GETPWENT_R symbol,
which indicates to the C program that the getpwent_r()
routine is available.
d_getpwnam_rThis variable conditionally defines the HAS_GETPWNAM_R symbol,
which indicates to the C program that the getpwnam_r()
routine is available.
d_getpwuid_rThis variable conditionally defines the HAS_GETPWUID_R symbol,
which indicates to the C program that the getpwuid_r()
routine is available.
d_getsbynameThis variable conditionally defines the HAS_GETSERVBYNAME
symbol, which indicates to the C program that the
getservbyname() routine is available to look up services
by their name.
d_getsbyportThis variable conditionally defines the HAS_GETSERVBYPORT
symbol, which indicates to the C program that the
getservbyport() routine is available to look up services
by their port.
d_getsentThis variable conditionally defines HAS_GETSERVENT if getservent() is
available to look up network services in some data base or another.
d_getservbyname_rThis variable conditionally defines the HAS_GETSERVBYNAME_R symbol,
which indicates to the C program that the getservbyname_r()
routine is available.
d_getservbyport_rThis variable conditionally defines the HAS_GETSERVBYPORT_R symbol,
which indicates to the C program that the getservbyport_r()
routine is available.
d_getservent_rThis variable conditionally defines the HAS_GETSERVENT_R symbol,
which indicates to the C program that the getservent_r()
routine is available.
d_getservprotosThis variable conditionally defines the HAS_GETSERV_PROTOS symbol,
which indicates to the C program that <netdb.h> supplies
prototypes for the various getserv*() functions.
See also netdbtype.U for probing for various netdb types.
d_getspnamThis variable conditionally defines HAS_GETSPNAM if getspnam() is
available to retrieve SysV shadow password entries by name.
d_getspnam_rThis variable conditionally defines the HAS_GETSPNAM_R symbol,
which indicates to the C program that the getspnam_r()
routine is available.
d_gettimeodThis variable conditionally defines the HAS_GETTIMEOFDAY symbol, which
indicates that the gettimeofday() system call exists (to obtain a
sub-second accuracy clock). You should probably include <sys/resource.h>.
d_gmtime_rThis variable conditionally defines the HAS_GMTIME_R symbol,
which indicates to the C program that the gmtime_r()
routine is available.
d_gnulibcDefined if we're dealing with the GNU C Library.
d_grpasswdThis variable conditionally defines GRPASSWD, which indicates
that struct group in <grp.h> contains gr_passwd.
d_hasmntoptThis variable conditionally defines the HAS_HASMNTOPT symbol, which
indicates to the C program that the hasmntopt() routine is available
to query the mount options of file systems.
d_htonlThis variable conditionally defines HAS_HTONL if htonl() and its
friends are available to do network order byte swapping.
d_ilogblThis variable conditionally defines the HAS_ILOGBL symbol, which
indicates to the C program that the ilogbl() routine is available.
If scalbnl is also present we can emulate frexpl.
d_indexThis variable conditionally defines HAS_INDEX if index() and
rindex() are available for string searching.
d_inetatonThis variable conditionally defines the HAS_INET_ATON symbol, which
indicates to the C program that the inet_aton() function is available
to parse IP address dotted-quad strings.
d_int64_tThis symbol will be defined if the C compiler supports int64_t.
d_isasciiThis variable conditionally defines the HAS_ISASCII constant,
which indicates to the C program that isascii() is available.
d_isfiniteThis variable conditionally defines the HAS_ISFINITE symbol, which
indicates to the C program that the isfinite() routine is available.
d_isinfThis variable conditionally defines the HAS_ISINF symbol, which
indicates to the C program that the isinf() routine is available.
d_isnanThis variable conditionally defines the HAS_ISNAN symbol, which
indicates to the C program that the isnan() routine is available.
d_isnanlThis variable conditionally defines the HAS_ISNANL symbol, which
indicates to the C program that the isnanl() routine is available.
d_killpgThis variable conditionally defines the HAS_KILLPG symbol, which
indicates to the C program that the killpg() routine is available
to kill process groups.
d_lchownThis variable conditionally defines the HAS_LCHOWN symbol, which
indicates to the C program that the lchown() routine is available
to operate on a symbolic link (instead of following the link).
d_ldbl_digThis variable conditionally defines d_ldbl_dig if this system's
header files provide LDBL_DIG, which is the number of significant
digits in a long double precision number.
d_linkThis variable conditionally defines HAS_LINK if link() is
available to create hard links.
d_localtime_rThis variable conditionally defines the HAS_LOCALTIME_R symbol,
which indicates to the C program that the localtime_r()
routine is available.
d_locconvThis variable conditionally defines HAS_LOCALECONV if localeconv() is
available for numeric and monetary formatting conventions.
d_lockfThis variable conditionally defines HAS_LOCKF if lockf() is
available to do file locking.
d_longdblThis variable conditionally defines HAS_LONG_DOUBLE if
the long double type is supported.
d_longlongThis variable conditionally defines HAS_LONG_LONG if
the long long type is supported.
d_lseekprotoThis variable conditionally defines the HAS_LSEEK_PROTO symbol,
which indicates to the C program that the system provides
a prototype for the lseek() function. Otherwise, it is
up to the program to supply one.
d_lstatThis variable conditionally defines HAS_LSTAT if lstat() is
available to do file stats on symbolic links.
d_madviseThis variable conditionally defines HAS_MADVISE if madvise() is
available to map a file into memory.
d_mblenThis variable conditionally defines the HAS_MBLEN symbol, which
indicates to the C program that the mblen() routine is available
to find the number of bytes in a multibye character.
d_mbstowcsThis variable conditionally defines the HAS_MBSTOWCS symbol, which
indicates to the C program that the mbstowcs() routine is available
to convert a multibyte string into a wide character string.
d_mbtowcThis variable conditionally defines the HAS_MBTOWC symbol, which
indicates to the C program that the mbtowc() routine is available
to convert multibyte to a wide character.
d_memchrThis variable conditionally defines the HAS_MEMCHR symbol, which
indicates to the C program that the memchr() routine is available
to locate characters within a C string.
d_memcmpThis variable conditionally defines the HAS_MEMCMP symbol, which
indicates to the C program that the memcmp() routine is available
to compare blocks of memory.
d_memcpyThis variable conditionally defines the HAS_MEMCPY symbol, which
indicates to the C program that the memcpy() routine is available
to copy blocks of memory.
d_memmoveThis variable conditionally defines the HAS_MEMMOVE symbol, which
indicates to the C program that the memmove() routine is available
to copy potentatially overlapping blocks of memory.
d_memsetThis variable conditionally defines the HAS_MEMSET symbol, which
indicates to the C program that the memset() routine is available
to set blocks of memory.
d_mkdirThis variable conditionally defines the HAS_MKDIR symbol, which
indicates to the C program that the mkdir() routine is available
to create directories..
d_mkdtempThis variable conditionally defines the HAS_MKDTEMP symbol, which
indicates to the C program that the mkdtemp() routine is available
to exclusively create a uniquely named temporary directory.
d_mkfifoThis variable conditionally defines the HAS_MKFIFO symbol, which
indicates to the C program that the mkfifo() routine is available.
d_mkstempThis variable conditionally defines the HAS_MKSTEMP symbol, which
indicates to the C program that the mkstemp() routine is available
to exclusively create and open a uniquely named temporary file.
d_mkstempsThis variable conditionally defines the HAS_MKSTEMPS symbol, which
indicates to the C program that the mkstemps() routine is available
to exclusively create and open a uniquely named (with a suffix)
temporary file.
d_mktimeThis variable conditionally defines the HAS_MKTIME symbol, which
indicates to the C program that the mktime() routine is available.
d_mmapThis variable conditionally defines HAS_MMAP if mmap() is
available to map a file into memory.
d_modflThis variable conditionally defines the HAS_MODFL symbol, which
indicates to the C program that the modfl() routine is available.
d_modfl_pow32_bugThis variable conditionally defines the HAS_MODFL_POW32_BUG symbol,
which indicates that modfl() is broken for long doubles >= pow(2, 32).
For example from 4294967303.150000 one would get 4294967302.000000
and 1.150000. The bug has been seen in certain versions of glibc,
release 2.2.2 is known to be okay.
d_modflprotoThis symbol, if defined, indicates that the system provides
a prototype for the modfl() function. Otherwise, it is up
to the program to supply one. C99 says it should be
long double modfl(long double, long double *);
d_mprotectThis variable conditionally defines HAS_MPROTECT if mprotect() is
available to modify the access protection of a memory mapped file.
d_msgThis variable conditionally defines the HAS_MSG symbol, which
indicates that the entire msg*(2) library is present.
d_msg_ctruncThis variable conditionally defines the HAS_MSG_CTRUNC symbol,
which indicates that the MSG_CTRUNC is available. #ifdef is
not enough because it may be an enum, glibc has been known to do this.
d_msg_dontrouteThis variable conditionally defines the HAS_MSG_DONTROUTE symbol,
which indicates that the MSG_DONTROUTE is available. #ifdef is
not enough because it may be an enum, glibc has been known to do this.
d_msg_oobThis variable conditionally defines the HAS_MSG_OOB symbol,
which indicates that the MSG_OOB is available. #ifdef is
not enough because it may be an enum, glibc has been known to do this.
d_msg_peekThis variable conditionally defines the HAS_MSG_PEEK symbol,
which indicates that the MSG_PEEK is available. #ifdef is
not enough because it may be an enum, glibc has been known to do this.
d_msg_proxyThis variable conditionally defines the HAS_MSG_PROXY symbol,
which indicates that the MSG_PROXY is available. #ifdef is
not enough because it may be an enum, glibc has been known to do this.
d_msgctlThis variable conditionally defines the HAS_MSGCTL symbol, which
indicates to the C program that the msgctl() routine is available.
d_msggetThis variable conditionally defines the HAS_MSGGET symbol, which
indicates to the C program that the msgget() routine is available.
d_msghdr_sThis variable conditionally defines the HAS_STRUCT_MSGHDR symbol,
which indicates that the struct msghdr is supported.
d_msgrcvThis variable conditionally defines the HAS_MSGRCV symbol, which
indicates to the C program that the msgrcv() routine is available.
d_msgsndThis variable conditionally defines the HAS_MSGSND symbol, which
indicates to the C program that the msgsnd() routine is available.
d_msyncThis variable conditionally defines HAS_MSYNC if msync() is
available to synchronize a mapped file.
d_munmapThis variable conditionally defines HAS_MUNMAP if munmap() is
available to unmap a region mapped by mmap().
d_mymallocThis variable conditionally defines MYMALLOC in case other parts
of the source want to take special action if MYMALLOC is used.
This may include different sorts of profiling or error detection.
d_nanosleepThis variable conditionally defines HAS_NANOSLEEP
if nanosleep() is available to sleep with 1E-9 sec accuracy.
d_niceThis variable conditionally defines the HAS_NICE symbol, which
indicates to the C program that the nice() routine is available.
d_nl_langinfoThis variable conditionally defines the HAS_NL_LANGINFO symbol, which
indicates to the C program that the nl_langinfo() routine is available.
d_nv_preserves_uvThis variable indicates whether a variable of type nvtype can preserve all the bits a variable of type uvtype.
d_off64_tThis symbol will be defined if the C compiler supports off64_t.
d_old_pthread_create_joinableThis variable conditionally defines pthread_create_joinable.
undef if pthread.h defines PTHREAD_CREATE_JOINABLE.
d_oldpthreadsThis variable conditionally defines the OLD_PTHREADS_API symbol,
and indicates that Perl should be built to use the old
draft POSIX threads API. This is only potentially meaningful if
usethreads is set.
d_oldsockThis variable conditionally defines the OLDSOCKET symbol, which
indicates that the BSD socket interface is based on 4.1c and not 4.2.
d_open3This variable conditionally defines the HAS_OPEN3 manifest constant,
which indicates to the C program that the 3 argument version of
the open(2) function is available.
d_pathconfThis variable conditionally defines the HAS_PATHCONF symbol, which
indicates to the C program that the pathconf() routine is available
to determine file-system related limits and options associated
with a given filename.
d_pauseThis variable conditionally defines the HAS_PAUSE symbol, which
indicates to the C program that the pause() routine is available
to suspend a process until a signal is received.
d_perl_otherlibdirsThis variable conditionally defines PERL_OTHERLIBDIRS, which
contains a colon-separated set of paths for the perl binary to
include in @INC. See also otherlibdirs.
d_phostnameThis variable conditionally defines the HAS_PHOSTNAME symbol, which
contains the shell command which, when fed to popen(), may be
used to derive the host name.
d_pipeThis variable conditionally defines the HAS_PIPE symbol, which
indicates to the C program that the pipe() routine is available
to create an inter-process channel.
d_pollThis variable conditionally defines the HAS_POLL symbol, which
indicates to the C program that the poll() routine is available
to poll active file descriptors.
d_portableThis variable conditionally defines the PORTABLE symbol, which
indicates to the C program that it should not assume that it is
running on the machine it was compiled on.
d_PRId64This variable conditionally defines the PERL_PRId64 symbol, which indiciates that stdio has a symbol to print 64-bit decimal numbers.
d_PRIeldblThis variable conditionally defines the PERL_PRIfldbl symbol, which indiciates that stdio has a symbol to print long doubles.
d_PRIEUldblThis variable conditionally defines the PERL_PRIfldbl symbol, which
indiciates that stdio has a symbol to print long doubles.
The U in the name is to separate this from d_PRIeldbl so that even
case-blind systems can see the difference.
d_PRIfldblThis variable conditionally defines the PERL_PRIfldbl symbol, which indiciates that stdio has a symbol to print long doubles.
d_PRIFUldblThis variable conditionally defines the PERL_PRIfldbl symbol, which
indiciates that stdio has a symbol to print long doubles.
The U in the name is to separate this from d_PRIfldbl so that even
case-blind systems can see the difference.
d_PRIgldblThis variable conditionally defines the PERL_PRIfldbl symbol, which indiciates that stdio has a symbol to print long doubles.
d_PRIGUldblThis variable conditionally defines the PERL_PRIfldbl symbol, which
indiciates that stdio has a symbol to print long doubles.
The U in the name is to separate this from d_PRIgldbl so that even
case-blind systems can see the difference.
d_PRIi64This variable conditionally defines the PERL_PRIi64 symbol, which indiciates that stdio has a symbol to print 64-bit decimal numbers.
d_PRIo64This variable conditionally defines the PERL_PRIo64 symbol, which indiciates that stdio has a symbol to print 64-bit octal numbers.
d_PRIu64This variable conditionally defines the PERL_PRIu64 symbol, which indiciates that stdio has a symbol to print 64-bit unsigned decimal numbers.
d_PRIx64This variable conditionally defines the PERL_PRIx64 symbol, which indiciates that stdio has a symbol to print 64-bit hexadecimal numbers.
d_PRIXU64This variable conditionally defines the PERL_PRIXU64 symbol, which
indiciates that stdio has a symbol to print 64-bit hExADECimAl numbers.
The U in the name is to separate this from d_PRIx64 so that even
case-blind systems can see the difference.
d_procselfexeDefined if $procselfexe is symlink to the absolute pathname of the executing program.
d_pthread_atforkThis variable conditionally defines the HAS_PTHREAD_ATFORK symbol,
which indicates to the C program that the pthread_atfork()
routine is available.
d_pthread_attr_setscopeThis variable conditionally defines HAS_PTHREAD_ATTR_SETSCOPE if
pthread_attr_setscope() is available to set the contention scope
attribute of a thread attribute object.
d_pthread_yieldThis variable conditionally defines the HAS_PTHREAD_YIELD
symbol if the pthread_yield routine is available to yield
the execution of the current thread.
d_pwageThis variable conditionally defines PWAGE, which indicates
that struct passwd contains pw_age.
d_pwchangeThis variable conditionally defines PWCHANGE, which indicates
that struct passwd contains pw_change.
d_pwclassThis variable conditionally defines PWCLASS, which indicates
that struct passwd contains pw_class.
d_pwcommentThis variable conditionally defines PWCOMMENT, which indicates
that struct passwd contains pw_comment.
d_pwexpireThis variable conditionally defines PWEXPIRE, which indicates
that struct passwd contains pw_expire.
d_pwgecosThis variable conditionally defines PWGECOS, which indicates
that struct passwd contains pw_gecos.
d_pwpasswdThis variable conditionally defines PWPASSWD, which indicates
that struct passwd contains pw_passwd.
d_pwquotaThis variable conditionally defines PWQUOTA, which indicates
that struct passwd contains pw_quota.
d_qgcvtThis variable conditionally defines the HAS_QGCVT symbol, which
indicates to the C program that the qgcvt() routine is available.
d_quadThis variable, if defined, tells that there's a 64-bit integer type, quadtype.
d_random_rThis variable conditionally defines the HAS_RANDOM_R symbol,
which indicates to the C program that the random_r()
routine is available.
d_readdir64_rThis variable conditionally defines the HAS_READDIR64_R symbol,
which indicates to the C program that the readdir64_r()
routine is available.
d_readdirThis variable conditionally defines HAS_READDIR if readdir() is
available to read directory entries.
d_readdir_rThis variable conditionally defines the HAS_READDIR_R symbol,
which indicates to the C program that the readdir_r()
routine is available.
d_readlinkThis variable conditionally defines the HAS_READLINK symbol, which
indicates to the C program that the readlink() routine is available
to read the value of a symbolic link.
d_readvThis variable conditionally defines the HAS_READV symbol, which
indicates to the C program that the readv() routine is available.
d_recvmsgThis variable conditionally defines the HAS_RECVMSG symbol, which
indicates to the C program that the recvmsg() routine is available.
d_renameThis variable conditionally defines the HAS_RENAME symbol, which
indicates to the C program that the rename() routine is available
to rename files.
d_rewinddirThis variable conditionally defines HAS_REWINDDIR if rewinddir() is
available.
d_rmdirThis variable conditionally defines HAS_RMDIR if rmdir() is
available to remove directories.
d_safebcpyThis variable conditionally defines the HAS_SAFE_BCOPY symbol if
the bcopy() routine can do overlapping copies. Normally, you
should probably use memmove().
d_safemcpyThis variable conditionally defines the HAS_SAFE_MEMCPY symbol if
the memcpy() routine can do overlapping copies.
For overlapping copies, memmove() should be used, if available.
d_sanemcmpThis variable conditionally defines the HAS_SANE_MEMCMP symbol if
the memcpy() routine is available and can be used to compare relative
magnitudes of chars with their high bits set.
d_sbrkprotoThis variable conditionally defines the HAS_SBRK_PROTO symbol,
which indicates to the C program that the system provides
a prototype for the sbrk() function. Otherwise, it is
up to the program to supply one.
d_scalbnlThis variable conditionally defines the HAS_SCALBNL symbol, which
indicates to the C program that the scalbnl() routine is available.
If ilogbl is also present we can emulate frexpl.
d_sched_yieldThis variable conditionally defines the HAS_SCHED_YIELD
symbol if the sched_yield routine is available to yield
the execution of the current thread.
d_scm_rightsThis variable conditionally defines the HAS_SCM_RIGHTS symbol,
which indicates that the SCM_RIGHTS is available. #ifdef is
not enough because it may be an enum, glibc has been known to do this.
d_SCNfldblThis variable conditionally defines the PERL_PRIfldbl symbol, which indiciates that stdio has a symbol to scan long doubles.
d_seekdirThis variable conditionally defines HAS_SEEKDIR if seekdir() is
available.
d_selectThis variable conditionally defines HAS_SELECT if select() is
available to select active file descriptors. A <sys/time.h>
inclusion may be necessary for the timeout field.
d_semThis variable conditionally defines the HAS_SEM symbol, which
indicates that the entire sem*(2) library is present.
d_semctlThis variable conditionally defines the HAS_SEMCTL symbol, which
indicates to the C program that the semctl() routine is available.
d_semctl_semid_dsThis variable conditionally defines USE_SEMCTL_SEMID_DS, which
indicates that struct semid_ds * is to be used for semctl IPC_STAT.
d_semctl_semunThis variable conditionally defines USE_SEMCTL_SEMUN, which
indicates that union semun is to be used for semctl IPC_STAT.
d_semgetThis variable conditionally defines the HAS_SEMGET symbol, which
indicates to the C program that the semget() routine is available.
d_semopThis variable conditionally defines the HAS_SEMOP symbol, which
indicates to the C program that the semop() routine is available.
d_sendmsgThis variable conditionally defines the HAS_SENDMSG symbol, which
indicates to the C program that the sendmsg() routine is available.
d_setegidThis variable conditionally defines the HAS_SETEGID symbol, which
indicates to the C program that the setegid() routine is available
to change the effective gid of the current program.
d_seteuidThis variable conditionally defines the HAS_SETEUID symbol, which
indicates to the C program that the seteuid() routine is available
to change the effective uid of the current program.
d_setgrentThis variable conditionally defines the HAS_SETGRENT symbol, which
indicates to the C program that the setgrent() routine is available
for initializing sequential access to the group database.
d_setgrent_rThis variable conditionally defines the HAS_SETGRENT_R symbol,
which indicates to the C program that the setgrent_r()
routine is available.
d_setgrpsThis variable conditionally defines the HAS_SETGROUPS symbol, which
indicates to the C program that the setgroups() routine is available
to set the list of process groups.
d_sethentThis variable conditionally defines HAS_SETHOSTENT if sethostent() is
available.
d_sethostent_rThis variable conditionally defines the HAS_SETHOSTENT_R symbol,
which indicates to the C program that the sethostent_r()
routine is available.
d_setitimerThis variable conditionally defines the HAS_SETITIMER symbol, which
indicates to the C program that the setitimer() routine is available.
d_setlinebufThis variable conditionally defines the HAS_SETLINEBUF symbol, which
indicates to the C program that the setlinebuf() routine is available
to change stderr or stdout from block-buffered or unbuffered to a
line-buffered mode.
d_setlocaleThis variable conditionally defines HAS_SETLOCALE if setlocale() is
available to handle locale-specific ctype implementations.
d_setlocale_rThis variable conditionally defines the HAS_SETLOCALE_R symbol,
which indicates to the C program that the setlocale_r()
routine is available.
d_setnentThis variable conditionally defines HAS_SETNETENT if setnetent() is
available.
d_setnetent_rThis variable conditionally defines the HAS_SETNETENT_R symbol,
which indicates to the C program that the setnetent_r()
routine is available.
d_setpentThis variable conditi