doc: use ASCII in .texi files where UTF-8 isn't needed

[gnulib.git] / m4 / pselect.m4

diff --git a/m4/pselect.m4 b/m4/pselect.m4
index 5a76a7b..bf7c6b8 100644 (file)
--- a/m4/pselect.m4
+++ b/m4/pselect.m4
@@ -1,5 +1,5 @@
-# pselect.m4
-dnl Copyright (C) 2011 Free Software Foundation, Inc.
+# pselect.m4 serial 2
+dnl Copyright (C) 2011-2014 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
@@ -14,15 +14,53 @@ AC_DEFUN([gl_FUNC_PSELECT],
     AC_CACHE_CHECK([whether signature of pselect conforms to POSIX],
       gl_cv_sig_pselect,
       [AC_LINK_IFELSE(
-        [AC_LANG_PROGRAM(
-             [[#include <sys/select.h>
-               ]],
-             [[int (*p) (int, fd_set *, fd_set *, fd_set *restrict,
-                         struct timespec const *restrict,
-                         sigset_t const *restrict) = pselect;
-               return !p;]])],
-        [gl_cv_sig_pselect=yes],
-        [gl_cv_sig_pselect=no])])
+         [AC_LANG_PROGRAM(
+              [[#include <sys/select.h>
+                ]],
+              [[int (*p) (int, fd_set *, fd_set *, fd_set *restrict,
+                          struct timespec const *restrict,
+                          sigset_t const *restrict) = pselect;
+                return !p;]])],
+         [gl_cv_sig_pselect=yes],
+         [gl_cv_sig_pselect=no])])
+
+    dnl On FreeBSD 8.2, pselect() doesn't always reject bad fds.
+    AC_CACHE_CHECK([whether pselect detects invalid fds],
+      [gl_cv_func_pselect_detects_ebadf],
+      [
+        AC_RUN_IFELSE([AC_LANG_PROGRAM([[
+#include <sys/types.h>
+#include <sys/time.h>
+#if HAVE_SYS_SELECT_H
+# include <sys/select.h>
+#endif
+#include <unistd.h>
+#include <errno.h>
+]],[[
+  fd_set set;
+  dup2(0, 16);
+  FD_ZERO(&set);
+  FD_SET(16, &set);
+  close(16);
+  struct timespec timeout;
+  timeout.tv_sec = 0;
+  timeout.tv_nsec = 5000;
+  return pselect (17, &set, NULL, NULL, &timeout, NULL) != -1 || errno != EBADF;
+]])], [gl_cv_func_pselect_detects_ebadf=yes],
+      [gl_cv_func_pselect_detects_ebadf=no],
+          [
+           case "$host_os" in
+                    # Guess yes on glibc systems.
+            *-gnu*) gl_cv_func_pselect_detects_ebadf="guessing yes" ;;
+                    # If we don't know, assume the worst.
+            *)      gl_cv_func_pselect_detects_ebadf="guessing no" ;;
+           esac
+          ])
+      ])
+    case $gl_cv_func_pselect_detects_ebadf in
+      *yes) ;;
+      *) REPLACE_PSELECT=1 ;;
+    esac
   fi
 
   if test $ac_cv_func_pselect = no || test $gl_cv_sig_pselect = no; then