unlocked_stdio - Online Linux Manual PageSection : 3
Updated : 2023-02-05
Source : Linux man-pages 6.03

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NAMEgetc_unlocked, getchar_unlocked, putc_unlocked, putchar_unlocked − nonlocking stdio functions

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LIBRARYStandard C library (libc, −lc)

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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[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_SOURCEclearerr_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_SOURCEfgets_unlocked(), fputs_unlocked(), getwc_unlocked(), getwchar_unlocked(), fgetwc_unlocked(), fputwc_unlocked(), putwchar_unlocked(), fgetws_unlocked(), fputws_unlocked(): _GNU_SOURCE

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DESCRIPTIONEach 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).

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ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7). InterfaceAttributeValue getc_unlocked(), 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() Thread safety MT-Safe race:stream getchar_unlocked(), getwchar_unlocked() Thread safety MT-Unsafe race:stdin putchar_unlocked(), putwchar_unlocked() Thread safety MT-Unsafe race:stdout feof_unlocked(), ferror_unlocked(), fileno_unlocked() Thread safetyMT-Safe

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STANDARDSThe 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.

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SEE ALSOflockfile(3), stdio(3) 0

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