putchar_unlocked()

write character to standard output (not thread-safe) 

Function

SYNOPSIS

#include <stdio.h>

int putchar_unlocked(int c);

DESCRIPTION

The putchar_unlocked() macro is equivalent to putc_unlocked(c, stdout). It writes a byte with value c, cast as an unsigned character, to the standard output stream stdout. After putchar_unlocked() returns, the character may be held in an internal buffer either until fflush() or fclose() are executed on stdout, or until the process executes exit() or abort().

This function may safely be used in a multi-threaded process only if the invoking thread owns stream, within a scope protected by flockfile() (or ftrylockfile()) and funlockfile().

PARAMETERS

c 

Is the character to be written.

RETURN VALUES

On success, putchar_unlocked() returns the value c that it wrote to stdout. On failure, it returns EOF and sets errno to one of the following values:

EACCES 

Another process has the file locked.

EBADF 

stdout is not a valid stream opened for writing.

EINTR 

A signal interrupted the call.

EIO 

An output error occurred.

ENOMEM 

Memory could not be allocated for internal buffers.

ENOSPC 

An attempt was made to write to a full disk.

ENXIO 

A device error occurred.

EPIPE 

An attempt was made to write to a closed pipe.

CONFORMANCE

POSIX.1 (1996).

MULTITHREAD SAFETY LEVEL

Unsafe.

PORTING ISSUES

If stdout is associated with a file opened in text mode, linefeed is translated to carriage-return linefeed on output. No such translation occurs if stdout is opened in binary mode.

AVAILABILITY

MKS Toolkit for Professional Developers
MKS Toolkit for Enterprise Developers
MKS Toolkit for Enterprise Developers 64-Bit Edition

SEE ALSO

Functions:
abort(), exit(), fclose(), fflush(), flockfile(), fputc(), fputs(), ftrylockfile(), funlockfile(), putc(), putc_unlocked(), putchar(), puts()

MKS Toolkit 9.2 Documentation Build 16.