unlocked_stdio

NAME

getc_unlocked, getchar_unlocked, putc_unlocked, putchar_unlocked - non-locking 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);



#define _BSD_SOURCE /* or _SVID_SOURCE */

#include <stdio.h>



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);



#define _GNU_SOURCE

#include <stdio.h>



char *fgets_unlocked(char *s, int n, FILE *stream);

int fputs_unlocked(const char *s, FILE *stream);



#define _GNU_SOURCE

#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);

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)