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



NAME
       getc_unlocked, getchar_unlocked, putc_unlocked, putchar_unlocked - non-
       locking stdio functions

SYNOPSIS
       #include <&lt;stdio.h>&gt;

       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 <&lt;stdio.h>&gt;

       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 <&lt;stdio.h>&gt;

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

       #define _GNU_SOURCE
       #include <&lt;wchar.h>&gt;

       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  with-
       out  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 3.05 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/.



                                  2007-07-26                 UNLOCKED_STDIO(3)