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NAME | SYNOPSIS | DESCRIPTION | ATTRIBUTES | CONFORMING TO | SEE ALSO | COLOPHON |
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UNLOCKED_STDIO(3) Linux Programmer's Manual UNLOCKED_STDIO(3)
getc_unlocked, getchar_unlocked, putc_unlocked, putchar_unlocked -
nonlocking stdio functions
#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():
/* Since glibc 2.24: */ _POSIX_C_SOURCE >= 199309L
|| /* Glibc versions <= 2.23: */ _POSIX_C_SOURCE
|| /* Glibc versions <= 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 since 2.19: */ _DEFAULT_SOURCE
|| /* Glibc versions <= 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).
┌─────────────────────┬───────────────┬───────────────────────┐
│Interface │ Attribute │ Value │
├─────────────────────┼───────────────┼───────────────────────┤
│getc_unlocked(), │ Thread safety │ MT-Safe race:stream │
│putc_unlocked(), │ │ │
│clearerr_unlocked(), │ │ │
│fflush_unlocked(), │ │ │
│fgetc_unlocked(), │ │ │
│fputc_unlocked(), │ │ │
│fread_unlocked(), │ │ │
│fwrite_unlocked(), │ │ │
│fgets_unlocked(), │ │ │
│fputs_unlocked(), │ │ │
│getwc_unlocked(), │ │ │
│fgetwc_unlocked(), │ │ │
│fputwc_unlocked(), │ │ │
│putwc_unlocked(), │ │ │
│fgetws_unlocked(), │ │ │
│fputws_unlocked() │ │ │
├─────────────────────┼───────────────┼───────────────────────┤
│getchar_unlocked(), │ Thread safety │ MT-Unsafe race:stdin │
│getwchar_unlocked() │ │ │
├─────────────────────┼───────────────┼───────────────────────┤
│putchar_unlocked(), │ Thread safety │ MT-Unsafe race:stdout │
│putwchar_unlocked() │ │ │
├─────────────────────┼───────────────┼───────────────────────┤
│feof_unlocked(), │ Thread safety │ MT-Safe │
│ferror_unlocked(), │ │ │
│fileno_unlocked() │ │ │
└─────────────────────┴───────────────┴───────────────────────┘
The four functions getc_unlocked(), getchar_unlocked(),
putc_unlocked(), putchar_unlocked() are in POSIX.1-2001 and
POSIX.1-2008.
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 4.15 of the Linux man-pages project. A
description of the project, information about reporting bugs, and the
latest version of this page, can be found at
https://www.kernel.org/doc/man-pages/.
2017-09-15 UNLOCKED_STDIO(3)
Pages that refer to this page: ferror(3), fflush(3), fgetc(3), fgetwc(3), fgetws(3), flockfile(3), fputwc(3), fputws(3), fread(3), gets(3), getwchar(3), puts(3), putwchar(3), stdio(3)
Copyright and license for this manual page
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