342 lines
9.8 KiB
C
342 lines
9.8 KiB
C
/****************************************************************************
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* sched/task/task_spawnparms.c
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*
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* Copyright (C) 2013 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <semaphore.h>
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#include <fcntl.h>
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#include <spawn.h>
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#include <debug.h>
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#include <nuttx/spawn.h>
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#include "task/spawn.h"
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#include "task/task.h"
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/****************************************************************************
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* Public Data
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****************************************************************************/
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sem_t g_spawn_parmsem = SEM_INITIALIZER(1);
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#ifndef CONFIG_SCHED_WAITPID
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sem_t g_spawn_execsem = SEM_INITIALIZER(0);
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#endif
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struct spawn_parms_s g_spawn_parms;
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: spawn_close, spawn_dup2, and spawn_open
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*
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* Description:
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* Implement individual file actions
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*
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* Input Parameters:
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* action - describes the action to be performed
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*
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* Returned Value:
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* posix_spawn() and posix_spawnp() will return zero on success.
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* Otherwise, an error number will be returned as the function return
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* value to indicate the error.
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*
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****************************************************************************/
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static inline int spawn_close(FAR struct spawn_close_file_action_s *action)
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{
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/* The return value from close() is ignored */
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svdbg("Closing fd=%d\n", action->fd);
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(void)close(action->fd);
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return OK;
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}
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static inline int spawn_dup2(FAR struct spawn_dup2_file_action_s *action)
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{
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int ret;
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/* Perform the dup */
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svdbg("Dup'ing %d->%d\n", action->fd1, action->fd2);
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ret = dup2(action->fd1, action->fd2);
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if (ret < 0)
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{
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int errcode = get_errno();
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sdbg("ERROR: dup2 failed: %d\n", errcode);
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return errcode;
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}
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return OK;
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}
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static inline int spawn_open(FAR struct spawn_open_file_action_s *action)
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{
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int fd;
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int ret = OK;
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/* Open the file */
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svdbg("Open'ing path=%s oflags=%04x mode=%04x\n",
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action->path, action->oflags, action->mode);
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fd = open(action->path, action->oflags, action->mode);
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if (fd < 0)
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{
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ret = get_errno();
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sdbg("ERROR: open failed: %d\n", ret);
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}
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/* Does the return file descriptor happen to match the required file
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* desciptor number?
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*/
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else if (fd != action->fd)
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{
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/* No.. dup2 to get the correct file number */
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svdbg("Dup'ing %d->%d\n", fd, action->fd);
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ret = dup2(fd, action->fd);
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if (ret < 0)
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{
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ret = get_errno();
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sdbg("ERROR: dup2 failed: %d\n", ret);
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}
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svdbg("Closing fd=%d\n", fd);
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close(fd);
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}
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return ret;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: spawn_semtake and spawn_semgive
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*
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* Description:
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* Give and take semaphores
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*
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* Input Parameters:
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*
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* sem - The semaphore to act on.
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void spawn_semtake(FAR sem_t *sem)
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{
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int ret;
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do
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{
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ret = sem_wait(sem);
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ASSERT(ret == 0 || get_errno() == EINTR);
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}
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while (ret != 0);
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}
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/****************************************************************************
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* Name: spawn_execattrs
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*
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* Description:
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* Set attributes of the new child task after it has been spawned.
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*
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* Input Parameters:
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*
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* pid - The pid of the new task.
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* attr - The attributes to use
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*
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* Returned Value:
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* Errors are not reported by this function. This is because errors
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* cannot occur, but ratther that the new task has already been started
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* so there is no graceful way to handle errors detected in this context
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* (unless we delete the new task and recover).
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*
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* Assumptions:
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* That task has been started but has not yet executed because pre-
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* emption is disabled.
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*
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****************************************************************************/
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int spawn_execattrs(pid_t pid, FAR const posix_spawnattr_t *attr)
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{
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struct sched_param param;
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DEBUGASSERT(attr);
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/* Now set the attributes. Note that we ignore all of the return values
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* here because we have already successfully started the task. If we
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* return an error value, then we would also have to stop the task.
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*/
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/* If we are only setting the priority, then call sched_setparm()
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* to set the priority of the of the new task.
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*/
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if ((attr->flags & POSIX_SPAWN_SETSCHEDPARAM) != 0)
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{
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/* Get the priority from the attrributes */
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param.sched_priority = attr->priority;
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/* If we are setting *both* the priority and the scheduler,
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* then we will call sched_setscheduler() below.
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*/
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if ((attr->flags & POSIX_SPAWN_SETSCHEDULER) == 0)
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{
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svdbg("Setting priority=%d for pid=%d\n",
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param.sched_priority, pid);
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(void)sched_setparam(pid, ¶m);
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}
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}
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/* If we are only changing the scheduling policy, then reset
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* the priority to the default value (the same as this thread) in
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* preparation for the sched_setscheduler() call below.
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*/
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else if ((attr->flags & POSIX_SPAWN_SETSCHEDULER) != 0)
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{
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(void)sched_getparam(0, ¶m);
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}
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/* Are we setting the scheduling policy? If so, use the priority
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* setting determined above.
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*/
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if ((attr->flags & POSIX_SPAWN_SETSCHEDULER) != 0)
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{
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svdbg("Setting policy=%d priority=%d for pid=%d\n",
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attr->policy, param.sched_priority, pid);
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(void)sched_setscheduler(pid, attr->policy, ¶m);
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}
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return OK;
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}
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/****************************************************************************
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* Name: spawn_proxyattrs
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*
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* Description:
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* Set attributes of the proxy task before it has started the new child
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* task.
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*
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* Input Parameters:
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*
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* pid - The pid of the new task.
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* attr - The attributes to use
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* file_actions - The attributes to use
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*
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* Returned Value:
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* 0 (OK) on successed; A negated errno value is returned on failure.
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*
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****************************************************************************/
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int spawn_proxyattrs(FAR const posix_spawnattr_t *attr,
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FAR const posix_spawn_file_actions_t *file_actions)
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{
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FAR struct spawn_general_file_action_s *entry;
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int ret = OK;
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/* Check if we need to change the signal mask */
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#ifndef CONFIG_DISABLE_SIGNALS
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if (attr && (attr->flags & POSIX_SPAWN_SETSIGMASK) != 0)
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{
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(void)sigprocmask(SIG_SETMASK, &attr->sigmask, NULL);
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}
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/* Were we also requested to perform file actions? */
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if (file_actions)
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#endif
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{
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/* Yes.. Execute each file action */
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for (entry = (FAR struct spawn_general_file_action_s *)file_actions;
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entry && ret == OK;
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entry = entry->flink)
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{
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switch (entry->action)
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{
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case SPAWN_FILE_ACTION_CLOSE:
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ret = spawn_close((FAR struct spawn_close_file_action_s *)entry);
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break;
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case SPAWN_FILE_ACTION_DUP2:
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ret = spawn_dup2((FAR struct spawn_dup2_file_action_s *)entry);
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break;
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case SPAWN_FILE_ACTION_OPEN:
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ret = spawn_open((FAR struct spawn_open_file_action_s *)entry);
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break;
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case SPAWN_FILE_ACTION_NONE:
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default:
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sdbg("ERROR: Unknown action: %d\n", entry->action);
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ret = EINVAL;
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break;
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}
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}
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}
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return ret;
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}
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