Commit | Line | Data |
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bb1dfdad | 1 | # pselect.m4 serial 2 |
ba318903 | 2 | dnl Copyright (C) 2011-2014 Free Software Foundation, Inc. |
c8fff863 PE |
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 | AC_DEFUN([gl_FUNC_PSELECT], | |
8 | [ | |
9 | AC_REQUIRE([gl_HEADER_SYS_SELECT]) | |
10 | AC_REQUIRE([AC_C_RESTRICT]) | |
11 | AC_CHECK_FUNCS_ONCE([pselect]) | |
12 | ||
13 | if test $ac_cv_func_pselect = yes; then | |
14 | AC_CACHE_CHECK([whether signature of pselect conforms to POSIX], | |
15 | gl_cv_sig_pselect, | |
16 | [AC_LINK_IFELSE( | |
17 | [AC_LANG_PROGRAM( | |
18 | [[#include <sys/select.h> | |
19 | ]], | |
20 | [[int (*p) (int, fd_set *, fd_set *, fd_set *restrict, | |
21 | struct timespec const *restrict, | |
22 | sigset_t const *restrict) = pselect; | |
23 | return !p;]])], | |
24 | [gl_cv_sig_pselect=yes], | |
25 | [gl_cv_sig_pselect=no])]) | |
bb1dfdad PE |
26 | |
27 | dnl On FreeBSD 8.2, pselect() doesn't always reject bad fds. | |
28 | AC_CACHE_CHECK([whether pselect detects invalid fds], | |
29 | [gl_cv_func_pselect_detects_ebadf], | |
30 | [ | |
31 | AC_RUN_IFELSE([AC_LANG_PROGRAM([[ | |
32 | #include <sys/types.h> | |
33 | #include <sys/time.h> | |
34 | #if HAVE_SYS_SELECT_H | |
35 | # include <sys/select.h> | |
36 | #endif | |
37 | #include <unistd.h> | |
38 | #include <errno.h> | |
39 | ]],[[ | |
40 | fd_set set; | |
41 | dup2(0, 16); | |
42 | FD_ZERO(&set); | |
43 | FD_SET(16, &set); | |
44 | close(16); | |
45 | struct timespec timeout; | |
46 | timeout.tv_sec = 0; | |
47 | timeout.tv_nsec = 5000; | |
48 | return pselect (17, &set, NULL, NULL, &timeout, NULL) != -1 || errno != EBADF; | |
49 | ]])], [gl_cv_func_pselect_detects_ebadf=yes], | |
50 | [gl_cv_func_pselect_detects_ebadf=no], | |
51 | [ | |
52 | case "$host_os" in | |
53 | # Guess yes on glibc systems. | |
54 | *-gnu*) gl_cv_func_pselect_detects_ebadf="guessing yes" ;; | |
55 | # If we don't know, assume the worst. | |
56 | *) gl_cv_func_pselect_detects_ebadf="guessing no" ;; | |
57 | esac | |
58 | ]) | |
59 | ]) | |
60 | case $gl_cv_func_pselect_detects_ebadf in | |
61 | *yes) ;; | |
62 | *) REPLACE_PSELECT=1 ;; | |
63 | esac | |
c8fff863 PE |
64 | fi |
65 | ||
66 | if test $ac_cv_func_pselect = no || test $gl_cv_sig_pselect = no; then | |
67 | REPLACE_PSELECT=1 | |
68 | fi | |
69 | ]) |