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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 *restrict ptr, size_t size, size_t n, FILE *restrict stream); size_t fwrite_unlocked(const void *restrict ptr, size_t size, size_t n, FILE *restrict stream); char *fgets_unlocked(char *restrict s, 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 *restrict ws, 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(): /* Since 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 since 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 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 themβ selves, 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). ββββββββββββββββββββββββββββββββββββββββββ¬ββββββββββββββββ¬ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ βInterface β Attribute β Value β ββββββββββββββββββββββββββββββββββββββββββΌββββββββββββββββΌββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ€ βgetc_unlocked(), putc_unlocked(), β Thread safety β MT-Safe race:stream β βclearerr_unlocked(), fflush_unlocked(), β β β βfgetc_unlocked(), fputc_unlocked(), β β β βfread_unlocked(), fwrite_unlocked(), β β β βfgets_unlocked(), fputs_unlocked(), β β β βgetwc_unlocked(), fgetwc_unlocked(), β β β βfputwc_unlocked(), putwc_unlocked(), β β β βfgetws_unlocked(), fputws_unlocked() β β β ββββββββββββββββββββββββββββββββββββββββββΌββββββββββββββββΌββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ€ βgetchar_unlocked(), getwchar_unlocked() β Thread safety β MT-Unsafe race:stdin β ββββββββββββββββββββββββββββββββββββββββββΌββββββββββββββββΌββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ€ βputchar_unlocked(), putwchar_unlocked() β Thread safety β MT-Unsafe race:stdout β ββββββββββββββββββββββββββββββββββββββββββΌββββββββββββββββΌββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ€ βfeof_unlocked(), ferror_unlocked(), β Thread safety β MT-Safe β βfileno_unlocked() β β β ββββββββββββββββββββββββββββββββββββββββββ΄ββββββββββββββββ΄ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ 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) 2021-03-22 UNLOCKED_STDIO(3)