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



NAME
       *_unlocked - non-locking stdio functions

SYNOPSIS
       #include 

       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 or _GNU_SOURCE */
       #include 

       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 

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

       #define _GNU_SOURCE
       #include 

       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 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 flock-
       file(3).

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 systems, and are available in recent glibc.  They should probably not be used.

SEE ALSO
       flockfile(3)



                                            2001-10-18                          UNLOCKED_STDIO(3)