unlocked_stdio
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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 non-standard *_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 2.79 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/.


  Copyright (C) 2001 Andries Brouwer <aebcwi.nl>.

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