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UNLOCKED_STDIO (3) | C library functions | Unix Manual Pages | :man

NAME

*_unlocked - non-locking stdio functions

CONTENTS

Synopsis
Description

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_SOURCEor_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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