1UNLOCKED_STDIO(3)          Linux Programmer's Manual         UNLOCKED_STDIO(3)
2
3
4

NAME

6       getc_unlocked, getchar_unlocked, putc_unlocked, putchar_unlocked - non‐
7       locking stdio functions
8

SYNOPSIS

10       #include <stdio.h>
11
12       int getc_unlocked(FILE *stream);
13       int getchar_unlocked(void);
14       int putc_unlocked(int c, FILE *stream);
15       int putchar_unlocked(int c);
16
17       void clearerr_unlocked(FILE *stream);
18       int feof_unlocked(FILE *stream);
19       int ferror_unlocked(FILE *stream);
20       int fileno_unlocked(FILE *stream);
21       int fflush_unlocked(FILE *stream);
22       int fgetc_unlocked(FILE *stream);
23       int fputc_unlocked(int c, FILE *stream);
24       size_t fread_unlocked(void *ptr, size_t size, size_t n,
25                             FILE *stream);
26       size_t fwrite_unlocked(const void *ptr, size_t size, size_t n,
27                             FILE *stream);
28
29       char *fgets_unlocked(char *s, int n, FILE *stream);
30       int fputs_unlocked(const char *s, FILE *stream);
31
32       #include <wchar.h>
33
34       wint_t getwc_unlocked(FILE *stream);
35       wint_t getwchar_unlocked(void);
36       wint_t fgetwc_unlocked(FILE *stream);
37       wint_t fputwc_unlocked(wchar_t wc, FILE *stream);
38       wint_t putwc_unlocked(wchar_t wc, FILE *stream);
39       wint_t putwchar_unlocked(wchar_t wc);
40       wchar_t *fgetws_unlocked(wchar_t *ws, int n, FILE *stream);
41       int fputws_unlocked(const wchar_t *ws, FILE *stream);
42
43   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
44
45       getc_unlocked(), getchar_unlocked(), putc_unlocked(),
46       putchar_unlocked(): _POSIX_C_SOURCE >= 1 || _XOPEN_SOURCE ||
47       _POSIX_SOURCE || _BSD_SOURCE || _SVID_SOURCE
48
49       clearerr_unlocked(), feof_unlocked(), ferror_unlocked(),
50       fileno_unlocked(), fflush_unlocked(), fgetc_unlocked(),
51       fputc_unlocked(), fread_unlocked(), fwrite_unlocked(): _BSD_SOURCE ||
52       _SVID_SOURCE
53
54       fgets_unlocked(), fputs_unlocked(), getwc_unlocked(),
55       getwchar_unlocked(), fgetwc_unlocked(), fputwc_unlocked(),
56       putwchar_unlocked(), fgetws_unlocked(), fputws_unlocked(): _GNU_SOURCE
57

DESCRIPTION

59       Each  of these functions has the same behavior as its counterpart with‐
60       out the "_unlocked" suffix, except that they do not use  locking  (they
61       do  not set locks themselves, and do not test for the presence of locks
62       set by others) and hence are thread-unsafe.  See flockfile(3).
63

CONFORMING TO

65       The     four     functions     getc_unlocked(),     getchar_unlocked(),
66       putc_unlocked(), putchar_unlocked() are in POSIX.1-2001.
67
68       The  nonstandard *_unlocked() variants occur on a few Unix systems, and
69       are available in recent glibc.  They should probably not be used.
70

SEE ALSO

72       flockfile(3), stdio(3), feature_test_macros(7)
73

COLOPHON

75       This page is part of release 3.25 of the Linux  man-pages  project.   A
76       description  of  the project, and information about reporting bugs, can
77       be found at http://www.kernel.org/doc/man-pages/.
78
79
80
81                                  2008-08-29                 UNLOCKED_STDIO(3)
Impressum