getc_unlocked, getchar_unlocked, putc_unlocked, putchar_unlocked − nonlocking stdio functions
Standard C library (libc, −lc)
#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 *_Nullable
stream);
int
fgetc_unlocked(FILE *stream);
int fputc_unlocked(int c, FILE
*stream);
size_t
fread_unlocked(void ptr[restrict
.size * .n],
size_t size, size_t n,
FILE *restrict stream);
size_t fwrite_unlocked(const void ptr[restrict
.size * .n],
size_t size, size_t n,
FILE *restrict stream);
char
*fgets_unlocked(char s[restrict
.n], int n, FILE *restrict
stream);
int fputs_unlocked(const char *restrict s,
FILE *restrict 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[restrict
.n], int n,
FILE *restrict stream);
int fputws_unlocked(const wchar_t *restrict
ws,
FILE *restrict stream);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
getc_unlocked(),
getchar_unlocked(), putc_unlocked(),
putchar_unlocked():
/* glibc >= 2.24: */ _POSIX_C_SOURCE >= 199309L
|| /* glibc <= 2.23: */ _POSIX_C_SOURCE
|| /* glibc <= 2.19: */ _SVID_SOURCE || _BSD_SOURCE
clearerr_unlocked(),
feof_unlocked(), ferror_unlocked(),
fileno_unlocked(), fflush_unlocked(),
fgetc_unlocked(), fputc_unlocked(),
fread_unlocked(), fwrite_unlocked():
/* glibc >= 2.19: */ _DEFAULT_SOURCE
|| /* glibc <= 2.19: */ _SVID_SOURCE || _BSD_SOURCE
fgets_unlocked(),
fputs_unlocked(), getwc_unlocked(),
getwchar_unlocked(), fgetwc_unlocked(),
fputwc_unlocked(), putwchar_unlocked(),
fgetws_unlocked(), fputws_unlocked():
_GNU_SOURCE
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).
For an explanation of the terms used in this section, see attributes(7).
getc_unlocked()
getchar_unlocked()
putc_unlocked()
putchar_unlocked()
POSIX.1-2008.
Others:
None.
getc_unlocked()
getchar_unlocked()
putc_unlocked()
putchar_unlocked()
POSIX.1-2001.
flockfile(3), stdio(3)