diff options
Diffstat (limited to 'nuttx/libc/spawn/lib_psfa_adddup2.c')
-rw-r--r-- | nuttx/libc/spawn/lib_psfa_adddup2.c | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/nuttx/libc/spawn/lib_psfa_adddup2.c b/nuttx/libc/spawn/lib_psfa_adddup2.c new file mode 100644 index 000000000..deb3cbdb3 --- /dev/null +++ b/nuttx/libc/spawn/lib_psfa_adddup2.c @@ -0,0 +1,104 @@ +/**************************************************************************** + * libc/string/lib_psfa_adddup2.c + * + * Copyright (C) 2013 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <gnutt@nuttx.org> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name NuttX nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> + +#include <stdlib.h> +#include <spawn.h> +#include <assert.h> +#include <errno.h> + +#include <nuttx/spawn.h> + +/**************************************************************************** + * Global Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: posix_spawn_file_actions_adddup2 + * + * Description: + * The posix_spawn_file_actions_adddup2() function adds a dup2 operation to + * the list of operations associated with the object referenced by + * file_actions, for subsequent use in a call to posix_spawn() or + * posix_spawnp(). The descriptor referred to by fd2 is created as + * if dup2() had been called on fd1 prior to the new child process + * starting execution. + * + * Input Parameters: + * file_actions - The posix_spawn_file_actions_t to append the action. + * fd1 - The first file descriptor to be argument to dup2. + * fd2 - The first file descriptor to be argument to dup2. + * + * Returned Value: + * On success, these functions return 0; on failure they return an error + * number from <errno.h>. + * + ****************************************************************************/ + +int posix_spawn_file_actions_adddup2(FAR posix_spawn_file_actions_t *file_actions, + int fd1, int fd2) +{ + FAR struct spawn_dup2_file_action_s *entry; + + DEBUGASSERT(file_actions && + fd1 >= 0 && fd1 < CONFIG_NFILE_DESCRIPTORS && + fd2 >= 0 && fd2 < CONFIG_NFILE_DESCRIPTORS); + + /* Allocate the action list entry */ + + entry = (FAR struct spawn_dup2_file_action_s *) + zalloc(sizeof(struct spawn_close_file_action_s)); + + if (!entry) + { + return ENOMEM; + } + + /* Initialize the file action entry */ + + entry->action = SPAWN_FILE_ACTION_DUP2; + entry->fd1 = fd1; + entry->fd2 = fd2; + + /* And add it to the file action list */ + + add_file_action(file_actions, (FAR struct spawn_general_file_action_s *)entry); + return OK; +} |