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2017-09-15
Aliases: clearerr_unlocked(3), clearerr_unlocked(3), clearerr_unlocked(3), clearerr_unlocked(3), clearerr_unlocked(3), clearerr_unlocked(3), clearerr_unlocked(3), clearerr_unlocked(3), clearerr_unlocked(3), clearerr_unlocked(3), feof_unlocked(3), feof_unlocked(3), feof_unlocked(3), feof_unlocked(3), feof_unlocked(3), feof_unlocked(3), feof_unlocked(3), feof_unlocked(3), feof_unlocked(3), feof_unlocked(3), ferror_unlocked(3), ferror_unlocked(3), ferror_unlocked(3), ferror_unlocked(3), ferror_unlocked(3), ferror_unlocked(3), ferror_unlocked(3), ferror_unlocked(3), ferror_unlocked(3), ferror_unlocked(3), fflush_unlocked(3), fflush_unlocked(3), fflush_unlocked(3), fflush_unlocked(3), fflush_unlocked(3), fflush_unlocked(3), fflush_unlocked(3), fflush_unlocked(3), fflush_unlocked(3), fflush_unlocked(3), fgetc_unlocked(3), fgetc_unlocked(3), fgetc_unlocked(3), fgetc_unlocked(3), fgetc_unlocked(3), fgetc_unlocked(3), fgetc_unlocked(3), fgetc_unlocked(3), fgetc_unlocked(3), fgetc_unlocked(3), fgets_unlocked(3), fgets_unlocked(3), fgets_unlocked(3), fgets_unlocked(3), fgets_unlocked(3), fgets_unlocked(3), fgets_unlocked(3), fgets_unlocked(3), fgets_unlocked(3), fgets_unlocked(3), fgetwc_unlocked(3), fgetwc_unlocked(3), fgetwc_unlocked(3), fgetwc_unlocked(3), fgetwc_unlocked(3), fgetwc_unlocked(3), fgetwc_unlocked(3), fgetwc_unlocked(3), fgetwc_unlocked(3), fgetwc_unlocked(3), fgetws_unlocked(3), fgetws_unlocked(3), fgetws_unlocked(3), fgetws_unlocked(3), fgetws_unlocked(3), fgetws_unlocked(3), fgetws_unlocked(3), fgetws_unlocked(3), fgetws_unlocked(3), fgetws_unlocked(3), fileno_unlocked(3), fileno_unlocked(3), fileno_unlocked(3), fileno_unlocked(3), fileno_unlocked(3), fileno_unlocked(3), fileno_unlocked(3), fileno_unlocked(3), fileno_unlocked(3), fileno_unlocked(3), fputc_unlocked(3), fputc_unlocked(3), fputc_unlocked(3), fputc_unlocked(3), fputc_unlocked(3), fputc_unlocked(3), fputc_unlocked(3), fputc_unlocked(3), fputc_unlocked(3), fputc_unlocked(3), fputs_unlocked(3), fputs_unlocked(3), fputs_unlocked(3), fputs_unlocked(3), fputs_unlocked(3), fputs_unlocked(3), fputs_unlocked(3), fputs_unlocked(3), fputs_unlocked(3), fputs_unlocked(3), fputwc_unlocked(3), fputwc_unlocked(3), fputwc_unlocked(3), fputwc_unlocked(3), fputwc_unlocked(3), fputwc_unlocked(3), fputwc_unlocked(3), fputwc_unlocked(3), fputwc_unlocked(3), fputwc_unlocked(3), fputws_unlocked(3), fputws_unlocked(3), fputws_unlocked(3), fputws_unlocked(3), fputws_unlocked(3), fputws_unlocked(3), fputws_unlocked(3), fputws_unlocked(3), fputws_unlocked(3), fputws_unlocked(3), fread_unlocked(3), fread_unlocked(3), fread_unlocked(3), fread_unlocked(3), fread_unlocked(3), fread_unlocked(3), fread_unlocked(3), fread_unlocked(3), fread_unlocked(3), fread_unlocked(3), fwrite_unlocked(3), fwrite_unlocked(3), fwrite_unlocked(3), fwrite_unlocked(3), fwrite_unlocked(3), fwrite_unlocked(3), fwrite_unlocked(3), fwrite_unlocked(3), fwrite_unlocked(3), fwrite_unlocked(3), getchar_unlocked(3), getchar_unlocked(3), getchar_unlocked(3), getchar_unlocked(3), getchar_unlocked(3), getchar_unlocked(3), getchar_unlocked(3), getchar_unlocked(3), getchar_unlocked(3), getchar_unlocked(3), getc_unlocked(3), getc_unlocked(3), getc_unlocked(3), getc_unlocked(3), getc_unlocked(3), getc_unlocked(3), getc_unlocked(3), getc_unlocked(3), getc_unlocked(3), getc_unlocked(3), getwchar_unlocked(3), getwchar_unlocked(3), getwchar_unlocked(3), getwchar_unlocked(3), getwchar_unlocked(3), getwchar_unlocked(3), getwchar_unlocked(3), getwchar_unlocked(3), getwchar_unlocked(3), getwchar_unlocked(3), getwc_unlocked(3), getwc_unlocked(3), getwc_unlocked(3), getwc_unlocked(3), getwc_unlocked(3), getwc_unlocked(3), getwc_unlocked(3), getwc_unlocked(3), getwc_unlocked(3), getwc_unlocked(3), putchar_unlocked(3), putchar_unlocked(3), putchar_unlocked(3), putchar_unlocked(3), putchar_unlocked(3), putchar_unlocked(3), putchar_unlocked(3), putchar_unlocked(3), putchar_unlocked(3), putchar_unlocked(3), putc_unlocked(3), putc_unlocked(3), putc_unlocked(3), putc_unlocked(3), putc_unlocked(3), putc_unlocked(3), putc_unlocked(3), putc_unlocked(3), putc_unlocked(3), putc_unlocked(3), putwchar_unlocked(3), putwchar_unlocked(3), putwchar_unlocked(3), putwchar_unlocked(3), putwchar_unlocked(3), putwchar_unlocked(3), putwchar_unlocked(3), putwchar_unlocked(3), putwchar_unlocked(3), putwchar_unlocked(3), putwc_unlocked(3), putwc_unlocked(3), putwc_unlocked(3), putwc_unlocked(3), putwc_unlocked(3), putwc_unlocked(3), putwc_unlocked(3), putwc_unlocked(3), putwc_unlocked(3), putwc_unlocked(3)

manpages-dev

Manual pages about using GNU/Linux for development

man-pages

Linux kernel and C library user-space interface documentation

NAME

getc_unlocked, getchar_unlocked, putc_unlocked, putchar_unlocked - nonlocking 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():
/* 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

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).

ATTRIBUTES

For an explanation of the terms used in this section, see attributes(7).
Interface Attribute Value
Thread safety MT-Safe race:stream
Thread safety MT-Unsafe race:stdin
Thread safety MT-Unsafe race:stdout
Thread safety MT-Safe

CONFORMING TO

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.

COLOPHON

This page is part of release 5.00 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/.
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