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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 functionsSYNOPSIS¶
#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():
clearerr_unlocked(), feof_unlocked(), ferror_unlocked(), fileno_unlocked(), fflush_unlocked(), fgetc_unlocked(), fputc_unlocked(), fread_unlocked(), fwrite_unlocked():
fgets_unlocked(), fputs_unlocked(), getwc_unlocked(), getwchar_unlocked(), fgetwc_unlocked(), fputwc_unlocked(), putwchar_unlocked(), fgetws_unlocked(), fputws_unlocked():
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 (), 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 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.
SEE ALSO¶
flockfile(3), stdio(3)COLOPHON¶
This page is part of release 4.10 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/.2016-03-15 |