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

       getc_unlocked,  getchar_unlocked, putc_unlocked, putchar_unlocked - nonlocking stdio func-

       #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():

       clearerr_unlocked(), feof_unlocked(), ferror_unlocked(), fileno_unlocked(),
       fflush_unlocked(), fgetc_unlocked(), fputc_unlocked(), fread_unlocked(),

       fgets_unlocked(), fputs_unlocked(), getwc_unlocked(), getwchar_unlocked(),
       fgetwc_unlocked(), fputwc_unlocked(), putwchar_unlocked(), fgetws_unlocked(),

       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  flock-

       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.

       flockfile(3), stdio(3)

       This  page  is  part of release 3.53 of the Linux man-pages project.  A description of the
       project,    and	  information	 about	  reporting    bugs,	can    be    found     at

					    2008-08-29				UNLOCKED_STDIO(3)
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