• NAME
  
  getc_unlocked, getchar_unlocked, putc_unlocked, putchar_unlocked - non-locking stdio functions
• 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
  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
  
  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 3.19 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/.
  

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