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| author | Paul Eggert <eggert@cs.ucla.edu> | 2012-10-04 00:15:42 -0700 |
|---|---|---|
| committer | Paul Eggert <eggert@cs.ucla.edu> | 2012-10-04 00:15:42 -0700 |
| commit | bb1dfdadd507bb4b77595c87875ef807c101ed7b (patch) | |
| tree | eb92a2335896c34e76a9e19362049396b8d0483f /m4/pselect.m4 | |
| parent | 88d69b7ddca305bb96d6e671300f6724e4f147dd (diff) | |
| download | emacs-bb1dfdadd507bb4b77595c87875ef807c101ed7b.tar.gz | |
Merge from gnulib.
Diffstat (limited to 'm4/pselect.m4')
| -rw-r--r-- | m4/pselect.m4 | 40 |
1 files changed, 39 insertions, 1 deletions
diff --git a/m4/pselect.m4 b/m4/pselect.m4 index 97bf12cd2d6..5edacd28f85 100644 --- a/m4/pselect.m4 +++ b/m4/pselect.m4 @@ -1,4 +1,4 @@ -# pselect.m4 +# pselect.m4 serial 2 dnl Copyright (C) 2011-2012 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, @@ -23,6 +23,44 @@ AC_DEFUN([gl_FUNC_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 |