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Linux 2.6 - man page for fputs_unlocked (linux section 3)

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

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 | +---------------------+---------------+-----------------------+ |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() | | | +---------------------+---------------+-----------------------+
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.
SEE ALSO
flockfile(3), stdio(3) 2017-09-15 UNLOCKED_STDIO(3)

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