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glibc  2.9
spawn_faction_addopen.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    `open' for the given file during the `spawn' call.  */
00027 int
00028 posix_spawn_file_actions_addopen (posix_spawn_file_actions_t *file_actions,
00029                               int fd, const char *path, int oflag,
00030                               mode_t mode)
00031 {
00032   int maxfd = __sysconf (_SC_OPEN_MAX);
00033   struct __spawn_action *rec;
00034 
00035   /* Test for the validity of the file descriptor.  */
00036   if (fd < 0 || fd >= maxfd)
00037     return EBADF;
00038 
00039   /* Allocate more memory if needed.  */
00040   if (file_actions->__used == file_actions->__allocated
00041       && __posix_spawn_file_actions_realloc (file_actions) != 0)
00042     /* This can only mean we ran out of memory.  */
00043     return ENOMEM;
00044 
00045   /* Add the new value.  */
00046   rec = &file_actions->__actions[file_actions->__used];
00047   rec->tag = spawn_do_open;
00048   rec->action.open_action.fd = fd;
00049   rec->action.open_action.path = path;
00050   rec->action.open_action.oflag = oflag;
00051   rec->action.open_action.mode = mode;
00052 
00053   /* Account for the new entry.  */
00054   ++file_actions->__used;
00055 
00056   return 0;
00057 }