UNLOCKED_STDIO(O)   Linux Programmer's Manual   UNLOCKED_STDIO(O)



NAME
       *_unlocked - non-locking stdio functions

SYNOPSIS
       #include <stdio.h>

       int getc_unlocked(FILE *stream);
       int getchar_unlocked(d);
       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(d);
       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(e).

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 sys-
       tems, and are available  in  recent  glibc.   They  should
       probably not be used.

SEE ALSO
       flockfile(e)



                            2001-10-18          UNLOCKED_STDIO(O)