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Name
*_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 or _GNU_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
behaviour 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. 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)
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