unlocked_stdio

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);

       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
       Each of these functions has the same behavior as its counterpart  with-
       out  the  "_unlocked" suffix, except that they do not use locking (they
       |clearerr_unlocked(), |               |                       |
       |fflush_unlocked(),   |               |                       |
       |fgetc_unlocked(),    |               |                       |
       |fputc_unlocked(),    |               |                       |
       |fread_unlocked(),    |               |                       |
       |fwrite_unlocked(),   |               |                       |
       |fgets_unlocked(),    |               |                       |
       |fputs_unlocked(),    |               |                       |
       |getwc_unlocked(),    |               |                       |
       |fgetwc_unlocked(),   |               |                       |
       |fputwc_unlocked(),   |               |                       |
       |putwc_unlocked(),    |               |                       |
       |fgetws_unlocked(),   |               |                       |
       |fputws_unlocked()    |               |                       |
       +---------------------+---------------+-----------------------+
       |getchar_unlocked(),  | Thread safety | MT-Unsafe race:stdin  |
       |getwchar_unlocked()  |               |                       |
       +---------------------+---------------+-----------------------+
       |putchar_unlocked(),  | Thread safety | MT-Unsafe race:stdout |
       |putwchar_unlocked()  |               |                       |
       +---------------------+---------------+-----------------------+
       |feof_unlocked(),     | Thread safety | MT-Safe               |
       |ferror_unlocked(),   |               |                       |
       |fileno_unlocked()    |               |                       |
       +---------------------+---------------+-----------------------+

CONFORMING TO
       The     four     functions     getc_unlocked(),     getchar_unlocked(),
       putc_unlocked(),   putchar_unlocked()   are   in    POSIX.1-2001    and
       POSIX.1-2008.

       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), stdio(3)

COLOPHON
       This page is part of release 4.04 of the Linux  man-pages  project.   A
       description  of  the project, information about reporting bugs, and the
       latest    version    of    this    page,    can     be     found     at
       http://www.kernel.org/doc/man-pages/.

                                  2015-08-08                 UNLOCKED_STDIO(3)
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