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author | RincewindsHat <12514511+RincewindsHat@users.noreply.github.com> | 2023-02-19 13:39:08 (GMT) |
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committer | RincewindsHat <12514511+RincewindsHat@users.noreply.github.com> | 2023-02-19 13:39:08 (GMT) |
commit | 74b6984047d330a3cc7cb7f63645849fe7676c63 (patch) | |
tree | 65a26800103d8d66f7e6cb4acfbfc9f315ec750b /gl/m4/fflush.m4 | |
parent | 423284edfa980fc3fdb51ab20af96685a988ba97 (diff) | |
parent | c07206f2ccc2356aa74bc6813a94c2190017d44e (diff) | |
download | monitoring-plugins-74b6984047d330a3cc7cb7f63645849fe7676c63.tar.gz |
Merge branch 'master' into check_icmp_cleanuprefs/pull/1807/head
Diffstat (limited to 'gl/m4/fflush.m4')
-rw-r--r-- | gl/m4/fflush.m4 | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/gl/m4/fflush.m4 b/gl/m4/fflush.m4 new file mode 100644 index 0000000..3e3c890 --- /dev/null +++ b/gl/m4/fflush.m4 | |||
@@ -0,0 +1,100 @@ | |||
1 | # fflush.m4 serial 18 | ||
2 | |||
3 | # Copyright (C) 2007-2023 Free Software Foundation, Inc. | ||
4 | # This file is free software; the Free Software Foundation | ||
5 | # gives unlimited permission to copy and/or distribute it, | ||
6 | # with or without modifications, as long as this notice is preserved. | ||
7 | |||
8 | dnl From Eric Blake | ||
9 | |||
10 | dnl Find out how to obey POSIX semantics of fflush(stdin) discarding | ||
11 | dnl unread input on seekable streams, rather than C99 undefined semantics. | ||
12 | |||
13 | AC_DEFUN([gl_FUNC_FFLUSH], | ||
14 | [ | ||
15 | AC_REQUIRE([gl_STDIO_H_DEFAULTS]) | ||
16 | gl_FUNC_FFLUSH_STDIN | ||
17 | case "$gl_cv_func_fflush_stdin" in | ||
18 | *yes) ;; | ||
19 | *) REPLACE_FFLUSH=1 ;; | ||
20 | esac | ||
21 | ]) | ||
22 | |||
23 | dnl Determine whether fflush works on input streams. | ||
24 | dnl Sets gl_cv_func_fflush_stdin. | ||
25 | |||
26 | AC_DEFUN([gl_FUNC_FFLUSH_STDIN], | ||
27 | [ | ||
28 | AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles | ||
29 | AC_CHECK_HEADERS_ONCE([unistd.h]) | ||
30 | AC_CACHE_CHECK([whether fflush works on input streams], | ||
31 | [gl_cv_func_fflush_stdin], | ||
32 | [echo hello world > conftest.txt | ||
33 | AC_RUN_IFELSE([AC_LANG_PROGRAM( | ||
34 | [[ | ||
35 | #include <stdio.h> | ||
36 | #if HAVE_UNISTD_H | ||
37 | # include <unistd.h> | ||
38 | #else /* on Windows with MSVC */ | ||
39 | # include <io.h> | ||
40 | #endif | ||
41 | ]GL_MDA_DEFINES], | ||
42 | [[FILE *f = fopen ("conftest.txt", "r"); | ||
43 | char buffer[10]; | ||
44 | int fd; | ||
45 | int c; | ||
46 | if (f == NULL) | ||
47 | return 1; | ||
48 | fd = fileno (f); | ||
49 | if (fd < 0 || fread (buffer, 1, 5, f) != 5) | ||
50 | { fclose (f); return 2; } | ||
51 | /* For deterministic results, ensure f read a bigger buffer. */ | ||
52 | if (lseek (fd, 0, SEEK_CUR) == 5) | ||
53 | { fclose (f); return 3; } | ||
54 | /* POSIX requires fflush-fseek to set file offset of fd. This fails | ||
55 | on BSD systems and on mingw. */ | ||
56 | if (fflush (f) != 0 || fseek (f, 0, SEEK_CUR) != 0) | ||
57 | { fclose (f); return 4; } | ||
58 | if (lseek (fd, 0, SEEK_CUR) != 5) | ||
59 | { fclose (f); return 5; } | ||
60 | /* Verify behaviour of fflush after ungetc. See | ||
61 | <https://www.opengroup.org/austin/aardvark/latest/xshbug3.txt> */ | ||
62 | /* Verify behaviour of fflush after a backup ungetc. This fails on | ||
63 | mingw. */ | ||
64 | c = fgetc (f); | ||
65 | ungetc (c, f); | ||
66 | fflush (f); | ||
67 | if (fgetc (f) != c) | ||
68 | { fclose (f); return 6; } | ||
69 | /* Verify behaviour of fflush after a non-backup ungetc. This fails | ||
70 | on glibc 2.8 and on BSD systems. */ | ||
71 | c = fgetc (f); | ||
72 | ungetc ('@', f); | ||
73 | fflush (f); | ||
74 | if (fgetc (f) != c) | ||
75 | { fclose (f); return 7; } | ||
76 | fclose (f); | ||
77 | return 0; | ||
78 | ]])], | ||
79 | [gl_cv_func_fflush_stdin=yes], | ||
80 | [gl_cv_func_fflush_stdin=no], | ||
81 | [case "$host_os" in | ||
82 | # Guess no on native Windows. | ||
83 | mingw*) gl_cv_func_fflush_stdin="guessing no" ;; | ||
84 | *) gl_cv_func_fflush_stdin=cross ;; | ||
85 | esac | ||
86 | ]) | ||
87 | rm conftest.txt | ||
88 | ]) | ||
89 | case "$gl_cv_func_fflush_stdin" in | ||
90 | *yes) gl_func_fflush_stdin=1 ;; | ||
91 | *no) gl_func_fflush_stdin=0 ;; | ||
92 | *) gl_func_fflush_stdin='(-1)' ;; | ||
93 | esac | ||
94 | AC_DEFINE_UNQUOTED([FUNC_FFLUSH_STDIN], [$gl_func_fflush_stdin], | ||
95 | [Define to 1 if fflush is known to work on stdin as per POSIX.1-2008, | ||
96 | 0 if fflush is known to not work, -1 if unknown.]) | ||
97 | ]) | ||
98 | |||
99 | # Prerequisites of lib/fflush.c. | ||
100 | AC_DEFUN([gl_PREREQ_FFLUSH], [:]) | ||