From 23c11479b3ad787adc7a651ee0c4347839e47723 Mon Sep 17 00:00:00 2001 From: Lorry Tar Creator Date: Sun, 22 Sep 2013 07:04:10 +0000 Subject: Imported from /home/lorry/working-area/delta_m4-tarball/m4-1.4.17.tar.xz. --- lib/spawn_faction_adddup2.c | 70 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 70 insertions(+) create mode 100644 lib/spawn_faction_adddup2.c (limited to 'lib/spawn_faction_adddup2.c') diff --git a/lib/spawn_faction_adddup2.c b/lib/spawn_faction_adddup2.c new file mode 100644 index 0000000..56ff1ec --- /dev/null +++ b/lib/spawn_faction_adddup2.c @@ -0,0 +1,70 @@ +/* Copyright (C) 2000, 2009-2013 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + This program 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 of the License, or + (at your option) any later version. + + This program 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 this program. If not, see . */ + +#include + +/* Specification. */ +#include + +#include +#include + +#if !_LIBC +# define __sysconf(open_max) getdtablesize () +#endif + +#if !HAVE_WORKING_POSIX_SPAWN +# include "spawn_int.h" +#endif + +/* Add an action to FILE-ACTIONS which tells the implementation to call + 'dup2' for the given file descriptors during the 'spawn' call. */ +int +posix_spawn_file_actions_adddup2 (posix_spawn_file_actions_t *file_actions, + int fd, int newfd) +#undef posix_spawn_file_actions_adddup2 +{ + int maxfd = __sysconf (_SC_OPEN_MAX); + + /* Test for the validity of the file descriptor. */ + if (fd < 0 || newfd < 0 || fd >= maxfd || newfd >= maxfd) + return EBADF; + +#if HAVE_WORKING_POSIX_SPAWN + return posix_spawn_file_actions_adddup2 (file_actions, fd, newfd); +#else + /* Allocate more memory if needed. */ + if (file_actions->_used == file_actions->_allocated + && __posix_spawn_file_actions_realloc (file_actions) != 0) + /* This can only mean we ran out of memory. */ + return ENOMEM; + + { + struct __spawn_action *rec; + + /* Add the new value. */ + rec = &file_actions->_actions[file_actions->_used]; + rec->tag = spawn_do_dup2; + rec->action.dup2_action.fd = fd; + rec->action.dup2_action.newfd = newfd; + + /* Account for the new entry. */ + ++file_actions->_used; + + return 0; + } +#endif +} -- cgit v1.2.1