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glibc  2.9
spawn_faction_addclose.c
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00001 /* Copyright (C) 2000 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <errno.h>
00020 #include <spawn.h>
00021 #include <unistd.h>
00022 
00023 #include "spawn_int.h"
00024 
00025 /* Add an action to FILE-ACTIONS which tells the implementation to call
00026    `close' for the given file descriptor during the `spawn' call.  */
00027 int
00028 posix_spawn_file_actions_addclose (posix_spawn_file_actions_t *file_actions,
00029                                int fd)
00030 {
00031   int maxfd = __sysconf (_SC_OPEN_MAX);
00032   struct __spawn_action *rec;
00033 
00034   /* Test for the validity of the file descriptor.  */
00035   if (fd < 0 || fd >= maxfd)
00036     return EBADF;
00037 
00038   /* Allocate more memory if needed.  */
00039   if (file_actions->__used == file_actions->__allocated
00040       && __posix_spawn_file_actions_realloc (file_actions) != 0)
00041     /* This can only mean we ran out of memory.  */
00042     return ENOMEM;
00043 
00044   /* Add the new value.  */
00045   rec = &file_actions->__actions[file_actions->__used];
00046   rec->tag = spawn_do_close;
00047   rec->action.open_action.fd = fd;
00048 
00049   /* Account for the new entry.  */
00050   ++file_actions->__used;
00051 
00052   return 0;
00053 }