UNLOCKED_STDIO
Section: Linux Programmer's Manual (3)
Updated: 2008-08-29
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NAME
getc_unlocked, getchar_unlocked, putc_unlocked,
putchar_unlocked - nonlocking stdio functions
SYNOPSIS
#include <stdio.h>
int getc_unlocked(FILE *stream);
int getchar_unlocked(void);
int putc_unlocked(int c, FILE *stream);
int putchar_unlocked(int c);
void clearerr_unlocked(FILE *stream);
int feof_unlocked(FILE *stream);
int ferror_unlocked(FILE *stream);
int fileno_unlocked(FILE *stream);
int fflush_unlocked(FILE *stream);
int fgetc_unlocked(FILE *stream);
int fputc_unlocked(int c, FILE *stream);
size_t fread_unlocked(void *ptr, size_t size, size_t n,
FILE *stream);
size_t fwrite_unlocked(const void *ptr, size_t size, size_t n,
FILE *stream);
char *fgets_unlocked(char *s, int n, FILE *stream);
int fputs_unlocked(const char *s, FILE *stream);
#include <wchar.h>
wint_t getwc_unlocked(FILE *stream);
wint_t getwchar_unlocked(void);
wint_t fgetwc_unlocked(FILE *stream);
wint_t fputwc_unlocked(wchar_t wc, FILE *stream);
wint_t putwc_unlocked(wchar_t wc, FILE *stream);
wint_t putwchar_unlocked(wchar_t wc);
wchar_t *fgetws_unlocked(wchar_t *ws, int n, FILE *stream);
int fputws_unlocked(const wchar_t *ws, FILE *stream);
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
getc_unlocked(),
getchar_unlocked(),
putc_unlocked(),
putchar_unlocked():
-
_POSIX_C_SOURCE >= 1 || _XOPEN_SOURCE || _POSIX_SOURCE ||
_BSD_SOURCE || _SVID_SOURCE
clearerr_unlocked(),
feof_unlocked(),
ferror_unlocked(),
fileno_unlocked(),
fflush_unlocked(),
fgetc_unlocked(),
fputc_unlocked(),
fread_unlocked(),
fwrite_unlocked():
-
_BSD_SOURCE || _SVID_SOURCE
fgets_unlocked(),
fputs_unlocked(),
getwc_unlocked(),
getwchar_unlocked(),
fgetwc_unlocked(),
fputwc_unlocked(),
putwchar_unlocked(),
fgetws_unlocked(),
fputws_unlocked():
-
_GNU_SOURCE
DESCRIPTION
Each of these functions has the same behavior as its counterpart
without the "_unlocked" suffix, except that they do not use locking
(they do not set locks themselves, and do not test for the presence
of locks set by others) and hence are thread-unsafe.
See
flockfile(3).
CONFORMING TO
The four functions
getc_unlocked(),
getchar_unlocked(),
putc_unlocked(),
putchar_unlocked()
are in POSIX.1-2001.
The nonstandard
*_unlocked()
variants occur on a few Unix systems, and are available in recent glibc.
They should probably not be used.
SEE ALSO
flockfile(3),
stdio(3),
feature_test_macros(7)
COLOPHON
This page is part of release 3.27 of the Linux
man-pages
project.
A description of the project,
and information about reporting bugs,
can be found at
http://www.kernel.org/doc/man-pages/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- CONFORMING TO
-
- SEE ALSO
-
- COLOPHON
-
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