diff options
Diffstat (limited to 'gnu/spawn_faction_adddup2.c')
-rwxr-xr-x | gnu/spawn_faction_adddup2.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/gnu/spawn_faction_adddup2.c b/gnu/spawn_faction_adddup2.c new file mode 100755 index 00000000..6ba9108b --- /dev/null +++ b/gnu/spawn_faction_adddup2.c @@ -0,0 +1,60 @@ +/* Copyright (C) 2000, 2009, 2010 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 <http://www.gnu.org/licenses/>. */ + +#include <config.h> + +/* Specification. */ +#include <spawn.h> + +#include <errno.h> +#include <unistd.h> + +#if !_LIBC +# define __sysconf(open_max) getdtablesize () +#endif + +#include "spawn_int.h" + +/* 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) +{ + int maxfd = __sysconf (_SC_OPEN_MAX); + struct __spawn_action *rec; + + /* Test for the validity of the file descriptor. */ + if (fd < 0 || newfd < 0 || fd >= maxfd || newfd >= maxfd) + return EBADF; + + /* 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; + + /* 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; +} |