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| author | Sergey Poznyakoff <gray@gnu.org> | 2023-05-02 16:02:32 +0300 |
|---|---|---|
| committer | Sergey Poznyakoff <gray@gnu.org> | 2023-05-02 16:15:34 +0300 |
| commit | 15874b30207fa29faf8ce9e64add011b5afa8e05 (patch) | |
| tree | e0a36792cdbcdd822bcaa41fae9cf991b310f7a2 /am | |
| parent | 5ba0926fabd419e51f777f138389e3588bbd1ce9 (diff) | |
| download | wydawca-master.tar.gz wydawca-master.tar.bz2 | |
Diffstat (limited to 'am')
| -rw-r--r-- | am/ax_closefrom.m4 | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/am/ax_closefrom.m4 b/am/ax_closefrom.m4 new file mode 100644 index 0000000..959e767 --- /dev/null +++ b/am/ax_closefrom.m4 @@ -0,0 +1,64 @@ +# SYNOPSIS +# +# AX_CLOSEFROM +# +# DESCRIPTION +# +# This macro figures out the best way to close all file descriptors +# greater than or equal to the given one. It evaluates the following +# variants: +# +# 1. closefrom call (FreeBSD) +# 2. F_CLOSEM fcntl (NetBSD, AIX, IRIX) +# 3. proc_pidinfo call (Darwin) +# 4. /proc/self/fd filesystem (Linux) +# +# If none of these is applicable, brute force approach will be used. +# +# LICENSE +# +# This file is part of Wydawca +# Copyright (C) 2021-2023 Sergey Poznyakoff +# +# Wydawca is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 3, or (at your option) +# any later version. +# +# Wydawca is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with wydawca. If not, see <http://www.gnu.org/licenses/>. + +AC_DEFUN([AX_CLOSEFROM], +[ +AC_CHECK_FUNCS([sysconf getdtablesize closefrom proc_pidinfo]) + +AC_CHECK_DECL([F_CLOSEM], + AC_DEFINE([HAVE_FCNTL_CLOSEM], [1], + [Use F_CLOSEM fcntl for wy_close_fds_from]), + [], + [#include <limits.h> + #include <fcntl.h> +]) + +AC_CHECK_HEADERS([libproc.h]) + +AC_MSG_CHECKING([for closefrom interface]) +if test "$ac_cv_func_closefrom" = yes; then + closefrom_api=closefrom +elif test "$ac_cv_have_decl_F_CLOSEM" = yes; then + closefrom_api=F_CLOSEM +elif test "${ac_cv_header_libproc_h}-$ac_cv_func_proc_pidinfo" = "yes-yes"; then + closefrom_api=proc_pidinfo +elif test -d "/proc/self/fd" ; then + AC_DEFINE([HAVE_PROC_SELF_FD], [1], [Define if you have /proc/self/fd]) + closefrom_api=proc +else + closefrom_api=bruteforce +fi +AC_MSG_RESULT([$closefrom_api]) +]) |