NAME | SYNOPSIS | DESCRIPTION | CONFORMING TO | SEE ALSO | COLOPHON

The Linux Programming Interface

UNLOCKED_STDIO(3)             Linux Programmer's Manual             UNLOCKED_STDIO(3)

NAME         top

       getc_unlocked,  getchar_unlocked, putc_unlocked, putchar_unlocked - nonlocking
       stdio functions

SYNOPSIS         top

       #include <stdio.h>

       int getc_unlocked(FILE *stream);
       int getchar_unlocked(void);
       int putc_unlocked(int c, FILE *stream);
       int putchar_unlocked(int c);

       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);

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

       #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);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       getc_unlocked(), getchar_unlocked(), putc_unlocked(), putchar_unlocked():
           _POSIX_C_SOURCE >= 1 || _XOPEN_SOURCE || _POSIX_SOURCE || _BSD_SOURCE ||
           _SVID_SOURCE

       clearerr_unlocked(), feof_unlocked(), ferror_unlocked(), fileno_unlocked(),
       fflush_unlocked(), fgetc_unlocked(), fputc_unlocked(), fread_unlocked(),
       fwrite_unlocked():
           _BSD_SOURCE || _SVID_SOURCE

       fgets_unlocked(), fputs_unlocked(), getwc_unlocked(), getwchar_unlocked(),
       fgetwc_unlocked(), fputwc_unlocked(), putwchar_unlocked(), fgetws_unlocked(),
       fputws_unlocked():
           _GNU_SOURCE

DESCRIPTION         top

       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         top

       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         top

       flockfile(3), stdio(3)

COLOPHON         top

       This page is part of release 3.32 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/.

                                      2008-08-29                    UNLOCKED_STDIO(3)

HTML rendering created 2010-12-03 by Michael Kerrisk, author of The Linux Programming Interface