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1 /* Copyright (C) 2000, 2009-2012 Free Software Foundation, Inc.
2    This file is part of the GNU C Library.
3 
4    This program is free software: you can redistribute it and/or modify
5    it under the terms of the GNU General Public License as published by
6    the Free Software Foundation; either version 3 of the License, or
7    (at your option) any later version.
8 
9    This program is distributed in the hope that it will be useful,
10    but WITHOUT ANY WARRANTY; without even the implied warranty of
11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12    GNU General Public License for more details.
13 
14    You should have received a copy of the GNU General Public License
15    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
16 
17 #include <config.h>
18 
19 /* Specification.  */
20 #include <spawn.h>
21 
22 #include <errno.h>
23 #include <unistd.h>
24 
25 #if !_LIBC
26 # define __sysconf(open_max) getdtablesize ()
27 #endif
28 
29 #if !HAVE_WORKING_POSIX_SPAWN
30 # include "spawn_int.h"
31 #endif
32 
33 /* Add an action to FILE-ACTIONS which tells the implementation to call
34    'dup2' for the given file descriptors during the 'spawn' call.  */
35 int
posix_spawn_file_actions_adddup2(posix_spawn_file_actions_t * file_actions,int fd,int newfd)36 posix_spawn_file_actions_adddup2 (posix_spawn_file_actions_t *file_actions,
37                                   int fd, int newfd)
38 #undef posix_spawn_file_actions_adddup2
39 {
40   int maxfd = __sysconf (_SC_OPEN_MAX);
41 
42   /* Test for the validity of the file descriptor.  */
43   if (fd < 0 || newfd < 0 || fd >= maxfd || newfd >= maxfd)
44     return EBADF;
45 
46 #if HAVE_WORKING_POSIX_SPAWN
47   return posix_spawn_file_actions_adddup2 (file_actions, fd, newfd);
48 #else
49   /* Allocate more memory if needed.  */
50   if (file_actions->_used == file_actions->_allocated
51       && __posix_spawn_file_actions_realloc (file_actions) != 0)
52     /* This can only mean we ran out of memory.  */
53     return ENOMEM;
54 
55   {
56     struct __spawn_action *rec;
57 
58     /* Add the new value.  */
59     rec = &file_actions->_actions[file_actions->_used];
60     rec->tag = spawn_do_dup2;
61     rec->action.dup2_action.fd = fd;
62     rec->action.dup2_action.newfd = newfd;
63 
64     /* Account for the new entry.  */
65     ++file_actions->_used;
66 
67     return 0;
68   }
69 #endif
70 }
71