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 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
