Annotation of embedaddon/libiconv/libcharset/m4/fcntl-o.m4, revision 1.1.1.2
1.1.1.2 ! misho 1: # fcntl-o.m4 serial 6
! 2: dnl Copyright (C) 2006, 2009-2019 Free Software Foundation, Inc.
1.1 misho 3: dnl This file is free software; the Free Software Foundation
4: dnl gives unlimited permission to copy and/or distribute it,
5: dnl with or without modifications, as long as this notice is preserved.
6:
7: dnl Written by Paul Eggert.
8:
1.1.1.2 ! misho 9: AC_PREREQ([2.60])
! 10:
1.1 misho 11: # Test whether the flags O_NOATIME and O_NOFOLLOW actually work.
12: # Define HAVE_WORKING_O_NOATIME to 1 if O_NOATIME works, or to 0 otherwise.
13: # Define HAVE_WORKING_O_NOFOLLOW to 1 if O_NOFOLLOW works, or to 0 otherwise.
14: AC_DEFUN([gl_FCNTL_O_FLAGS],
15: [
16: dnl Persuade glibc <fcntl.h> to define O_NOATIME and O_NOFOLLOW.
17: AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
1.1.1.2 ! misho 18:
! 19: AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
! 20: AC_CHECK_HEADERS_ONCE([unistd.h])
! 21: AC_CHECK_FUNCS_ONCE([symlink])
1.1 misho 22: AC_CACHE_CHECK([for working fcntl.h], [gl_cv_header_working_fcntl_h],
23: [AC_RUN_IFELSE(
24: [AC_LANG_PROGRAM(
25: [[#include <sys/types.h>
26: #include <sys/stat.h>
1.1.1.2 ! misho 27: #if HAVE_UNISTD_H
! 28: # include <unistd.h>
! 29: #else /* on Windows with MSVC */
! 30: # include <io.h>
! 31: # include <stdlib.h>
! 32: # defined sleep(n) _sleep ((n) * 1000)
! 33: #endif
1.1 misho 34: #include <fcntl.h>
35: #ifndef O_NOATIME
36: #define O_NOATIME 0
37: #endif
38: #ifndef O_NOFOLLOW
39: #define O_NOFOLLOW 0
40: #endif
41: static int const constants[] =
42: {
43: O_CREAT, O_EXCL, O_NOCTTY, O_TRUNC, O_APPEND,
44: O_NONBLOCK, O_SYNC, O_ACCMODE, O_RDONLY, O_RDWR, O_WRONLY
45: };
46: ]],
47: [[
1.1.1.2 ! misho 48: int result = !constants;
! 49: #if HAVE_SYMLINK
1.1 misho 50: {
51: static char const sym[] = "conftest.sym";
1.1.1.2 ! misho 52: if (symlink ("/dev/null", sym) != 0)
! 53: result |= 2;
! 54: else
! 55: {
! 56: int fd = open (sym, O_WRONLY | O_NOFOLLOW | O_CREAT, 0);
! 57: if (fd >= 0)
! 58: {
! 59: close (fd);
! 60: result |= 4;
! 61: }
! 62: }
! 63: if (unlink (sym) != 0 || symlink (".", sym) != 0)
! 64: result |= 2;
! 65: else
! 66: {
! 67: int fd = open (sym, O_RDONLY | O_NOFOLLOW);
! 68: if (fd >= 0)
! 69: {
! 70: close (fd);
! 71: result |= 4;
! 72: }
! 73: }
1.1 misho 74: unlink (sym);
75: }
1.1.1.2 ! misho 76: #endif
1.1 misho 77: {
78: static char const file[] = "confdefs.h";
79: int fd = open (file, O_RDONLY | O_NOATIME);
1.1.1.2 ! misho 80: if (fd < 0)
! 81: result |= 8;
! 82: else
! 83: {
! 84: struct stat st0;
! 85: if (fstat (fd, &st0) != 0)
! 86: result |= 16;
! 87: else
! 88: {
! 89: char c;
! 90: sleep (1);
! 91: if (read (fd, &c, 1) != 1)
! 92: result |= 24;
! 93: else
! 94: {
! 95: if (close (fd) != 0)
! 96: result |= 32;
! 97: else
! 98: {
! 99: struct stat st1;
! 100: if (stat (file, &st1) != 0)
! 101: result |= 40;
! 102: else
! 103: if (st0.st_atime != st1.st_atime)
! 104: result |= 64;
! 105: }
! 106: }
! 107: }
! 108: }
1.1 misho 109: }
1.1.1.2 ! misho 110: return result;]])],
1.1 misho 111: [gl_cv_header_working_fcntl_h=yes],
112: [case $? in #(
1.1.1.2 ! misho 113: 4) gl_cv_header_working_fcntl_h='no (bad O_NOFOLLOW)';; #(
1.1 misho 114: 64) gl_cv_header_working_fcntl_h='no (bad O_NOATIME)';; #(
1.1.1.2 ! misho 115: 68) gl_cv_header_working_fcntl_h='no (bad O_NOATIME, O_NOFOLLOW)';; #(
1.1 misho 116: *) gl_cv_header_working_fcntl_h='no';;
117: esac],
1.1.1.2 ! misho 118: [case "$host_os" in
! 119: # Guess 'no' on native Windows.
! 120: mingw*) gl_cv_header_working_fcntl_h='no' ;;
! 121: *) gl_cv_header_working_fcntl_h=cross-compiling ;;
! 122: esac
! 123: ])
! 124: ])
1.1 misho 125:
126: case $gl_cv_header_working_fcntl_h in #(
127: *O_NOATIME* | no | cross-compiling) ac_val=0;; #(
128: *) ac_val=1;;
129: esac
130: AC_DEFINE_UNQUOTED([HAVE_WORKING_O_NOATIME], [$ac_val],
131: [Define to 1 if O_NOATIME works.])
132:
133: case $gl_cv_header_working_fcntl_h in #(
134: *O_NOFOLLOW* | no | cross-compiling) ac_val=0;; #(
135: *) ac_val=1;;
136: esac
137: AC_DEFINE_UNQUOTED([HAVE_WORKING_O_NOFOLLOW], [$ac_val],
138: [Define to 1 if O_NOFOLLOW works.])
139: ])
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