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..fc788a4e9
--- /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 "spawn/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;
+}