The sigset() function is used to modify signal disposition
by handling receipt of the signal number sig in one of three
ways: taking the default action for the signal, ignoring the signal, or
catching the signal. If the value of disp is
SIG_DFL, default handling for that signal occurs.
If the value of disp is SIG_IGN, the signal
is ignored. Otherwise, disp points to a function (a signal
handler) to be called when that signal occurs.
If disp is the address of the signal handler, the system
adds sig to the signal mask of the calling process before
executing the signal handler. When the signal handler returns, the system
restores the signal mask of the calling process to its state prior to
delivering the signal. If disp is SIG_HOLD,
the system adds sig to the signal mask of the calling process
and leaves the signal's disposition unchanged.
If sigset() is used to set the disposition of
SIGCHLD to a signal handler, SIGCHLD
is not sent when the children of the
calling process are stopped or continued.
If sigset() is used to
set the disposition of SIGCHLD to SIG_IGN,
the child processes of the calling
process does not create zombie processes when they terminate. If
the calling process subsequently waits for its children, it
blocks until all of its children terminate; it then returns a
value of -1 with errno set to ECHILD.
Specifies the signal, which may be any signal except
SIGKILL or SIGSTOP.
Specifies the signal's disposition, which may be SIG_DFL,
SIG_HOLD, SIG_IGN, or the address of a
sigset() returns SIG_HOLD if the signal
had been blocked, or it returns the signal's previous disposition if it
had not been blocked. On failure, it returns SIG_ERR and
sets errno to one of the following values:
The value of sig is not a valid
signal or is equal to SIGKILL or SIGSTOP.
PTC MKS Toolkit for Professional Developers
PTC MKS Toolkit for Professional Developers 64-Bit Edition
PTC MKS Toolkit for Enterprise Developers
PTC MKS Toolkit for Enterprise Developers 64-Bit Edition
- kill(), pause(), sigaction(), sighold(), sigignore(), signal(), sigpause(), sigrelse(), wait()
PTC MKS Toolkit 10.3 Documentation Build 39.