Manpages

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():

/* Since glibc 2.24: */ _POSIX_C_SOURCE >= 199309L
|| /* Glibc versions <= 2.23: */ _POSIX_C_SOURCE
|| /* Glibc versions <= 2.19: */ _SVID_SOURCE || _BSD_SOURCE

clearerr_unlocked(), feof_unlocked(), ferror_unlocked(), fileno_unlocked(), fflush_unlocked(), fgetc_unlocked(), fputc_unlocked(), fread_unlocked(), fwrite_unlocked():

/* Glibc since 2.19: */ _DEFAULT_SOURCE
|| /* Glibc versions <= 2.19: */ _SVID_SOURCE || _BSD_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).

ATTRIBUTES

For an explanation of the terms used in this section, see attributes(7).

Image /var/www/mancx/application/src/../www/___/img/man3/man3/unlocked_stdio1.png

CONFORMING TO

The four functions getc_unlocked(), getchar_unlocked(), putc_unlocked(), putchar_unlocked() are in POSIX.1-2001 and POSIX.1-2008.

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)

COLOPHON

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