Provided by: manpages-dev_6.8-2_all
NAME
getc_unlocked, getchar_unlocked, putc_unlocked, putchar_unlocked - nonlocking stdio functions
LIBRARY
Standard C library (libc, -lc)
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 *_Nullable 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_SOURCE clearerr_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_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() │ │ │ └─────────────────────┴───────────────┴───────────────────────────────────────────────────┘
STANDARDS
getc_unlocked() getchar_unlocked() putc_unlocked() putchar_unlocked() POSIX.1-2008. Others: None.
HISTORY
getc_unlocked() getchar_unlocked() putc_unlocked() putchar_unlocked() POSIX.1-2001.
SEE ALSO
flockfile(3), stdio(3)