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);
"#define _BSD_SOURCE""/*or_SVID_SOURCEor_GNU_SOURCE*/
#include <stdio.h>
"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 <stdio.h>
"char *fgets_unlocked(char *"s", int "n", FILE *"stream);
"int fputs_unlocked(const char *"s", FILE *"stream);
#define _GNU_SOURCE
#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);
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 flockfile(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)
