Add spawn attribute logic which will eventually be needed to support posix_spawn()

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5501 42af7a65-404d-4744-a932-0658087f49c3
2026-05-26 02:36:11 +08:00 · 2013-01-10 00:45:11 +00:00
parent 21684b51f1
commit cb85fb1daa
19 changed files with 891 additions and 25 deletions
@@ -0,0 +1,102 @@
+/****************************************************************************
+ * libc/string/lib_psa_init.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 <sched.h>
+#include <signal.h>
+#include <spawn.h>
+#include <assert.h>
+#include <errno.h>
+#include <errno.h>
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: posix_spawnattr_init
+ *
+ * Description:
+ *   The posix_spawnattr_init() function initializes the object referenced
+ *   by attr, to an empty set of spawn attributes for subsequent use in a
+ *   call to posix_spawn() or posix_spawnp().
+ *
+ * Input Parameters:
+ *   attr - The address spawn attributes to be initialized.
+ *
+ * Returned Value:
+ *   On success, these functions return 0; on failure they return an error
+ *   number from <errno.h>.
+ *
+ ****************************************************************************/
+
+int posix_spawnattr_init(posix_spawnattr_t *attr)
+{
+  struct sched_param param;
+  int ret;
+
+  DEBUGASSERT(attr);
+
+  /* Flags: None */
+
+  attr->flags = 0;
+
+  /* Signal sets.  Don't really matter unless flags are set (then the settings
+   * are not really our responsibility).
+   */
+
+  sigemptyset(&attr->sigdefault);
+  sigemptyset(&attr->sigmask);
+
+  /* Set the default scheduler policy to the policy of this task */
+
+  attr->policy = sched_getscheduler(0);
+
+  /* Set the default priority to the same priority as this task */
+
+  ret = sched_getparam(0, &param);
+  if (ret < 0)
+    {
+      return errno;
+    }
+
+  attr->priority = param.sched_priority;
+  return OK;
+}