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- /****************************************************************************
- * sched/task/task_spawnparms.c
- *
- * Copyright (C) 2013, 2015, 2017-2019 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 <semaphore.h>
- #include <fcntl.h>
- #include <spawn.h>
- #include <debug.h>
- #include <nuttx/signal.h>
- #include <nuttx/spawn.h>
- #include <nuttx/fs/fs.h>
- #include "task/spawn.h"
- #include "task/task.h"
- /****************************************************************************
- * Public Data
- ****************************************************************************/
- sem_t g_spawn_parmsem = SEM_INITIALIZER(1);
- #ifndef CONFIG_SCHED_WAITPID
- sem_t g_spawn_execsem = SEM_INITIALIZER(0);
- #endif
- struct spawn_parms_s g_spawn_parms;
- /****************************************************************************
- * Private Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: nxspawn_close, nxspawn_dup2, and nxspawn_open
- *
- * Description:
- * Implement individual file actions
- *
- * Input Parameters:
- * action - describes the action to be performed
- *
- * Returned Value:
- * posix_spawn() and posix_spawnp() will return zero on success.
- * Otherwise, an error number will be returned as the function return
- * value to indicate the error.
- *
- ****************************************************************************/
- static inline int nxspawn_close(FAR struct spawn_close_file_action_s *action)
- {
- /* The return value from close() is ignored */
- sinfo("Closing fd=%d\n", action->fd);
- (void)close(action->fd);
- return OK;
- }
- static inline int nxspawn_dup2(FAR struct spawn_dup2_file_action_s *action)
- {
- int ret;
- /* Perform the dup */
- sinfo("Dup'ing %d->%d\n", action->fd1, action->fd2);
- ret = dup2(action->fd1, action->fd2);
- if (ret < 0)
- {
- int errcode = get_errno();
- serr("ERROR: dup2 failed: %d\n", errcode);
- return -errcode;
- }
- return OK;
- }
- static inline int nxspawn_open(FAR struct spawn_open_file_action_s *action)
- {
- int fd;
- int ret = OK;
- /* Open the file */
- sinfo("Open'ing path=%s oflags=%04x mode=%04x\n",
- action->path, action->oflags, action->mode);
- fd = nx_open(action->path, action->oflags, action->mode);
- if (fd < 0)
- {
- ret = fd;
- serr("ERROR: open failed: %d\n", ret);
- }
- /* Does the return file descriptor happen to match the required file
- * descriptor number?
- */
- else if (fd != action->fd)
- {
- /* No.. dup2 to get the correct file number */
- sinfo("Dup'ing %d->%d\n", fd, action->fd);
- ret = dup2(fd, action->fd);
- if (ret < 0)
- {
- ret = get_errno();
- serr("ERROR: dup2 failed: %d\n", ret);
- }
- sinfo("Closing fd=%d\n", fd);
- close(fd);
- }
- return ret;
- }
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: spawn_semtake and spawn_semgive
- *
- * Description:
- * Give and take semaphores
- *
- * Input Parameters:
- *
- * sem - The semaphore to act on.
- *
- * Returned Value:
- * None
- *
- ****************************************************************************/
- void spawn_semtake(FAR sem_t *sem)
- {
- int ret;
- do
- {
- ret = nxsem_wait(sem);
- DEBUGASSERT(ret == 0 || ret == -EINTR);
- }
- while (ret == -EINTR);
- }
- /****************************************************************************
- * Name: spawn_execattrs
- *
- * Description:
- * Set attributes of the new child task after it has been spawned.
- *
- * Input Parameters:
- *
- * pid - The pid of the new task.
- * attr - The attributes to use
- *
- * Returned Value:
- * Errors are not reported by this function. This is not because errors
- * cannot occur, but rather that the new task has already been started
- * so there is no graceful way to handle errors detected in this context
- * (unless we delete the new task and recover).
- *
- * Assumptions:
- * That task has been started but has not yet executed because pre-
- * emption is disabled.
- *
- ****************************************************************************/
- int spawn_execattrs(pid_t pid, FAR const posix_spawnattr_t *attr)
- {
- struct sched_param param;
- int ret;
- DEBUGASSERT(attr);
- /* Now set the attributes. Note that we ignore all of the return values
- * here because we have already successfully started the task. If we
- * return an error value, then we would also have to stop the task.
- */
- /* If we are only setting the priority, then call sched_setparm()
- * to set the priority of the of the new task.
- */
- if ((attr->flags & POSIX_SPAWN_SETSCHEDPARAM) != 0)
- {
- #ifdef CONFIG_SCHED_SPORADIC
- /* Get the current sporadic scheduling parameters. Those will not be
- * modified.
- */
- ret = nxsched_getparam(pid, ¶m);
- if (ret < 0)
- {
- return ret;
- }
- #endif
- /* Get the priority from the attributes */
- param.sched_priority = attr->priority;
- /* If we are setting *both* the priority and the scheduler,
- * then we will call nxsched_setscheduler() below.
- */
- if ((attr->flags & POSIX_SPAWN_SETSCHEDULER) == 0)
- {
- sinfo("Setting priority=%d for pid=%d\n",
- param.sched_priority, pid);
- ret = nxsched_setparam(pid, ¶m);
- if (ret < 0)
- {
- return ret;
- }
- }
- }
- /* If we are only changing the scheduling policy, then reset
- * the priority to the default value (the same as this thread) in
- * preparation for the nxsched_setscheduler() call below.
- */
- else if ((attr->flags & POSIX_SPAWN_SETSCHEDULER) != 0)
- {
- ret = nxsched_getparam(0, ¶m);
- if (ret < 0)
- {
- return ret;
- }
- }
- /* Are we setting the scheduling policy? If so, use the priority
- * setting determined above.
- */
- if ((attr->flags & POSIX_SPAWN_SETSCHEDULER) != 0)
- {
- sinfo("Setting policy=%d priority=%d for pid=%d\n",
- attr->policy, param.sched_priority, pid);
- #ifdef CONFIG_SCHED_SPORADIC
- /* But take the sporadic scheduler parameters from the attributes */
- param.sched_ss_low_priority = (int)attr->low_priority;
- param.sched_ss_max_repl = (int)attr->max_repl;
- param.sched_ss_repl_period.tv_sec = attr->repl_period.tv_sec;
- param.sched_ss_repl_period.tv_nsec = attr->repl_period.tv_nsec;
- param.sched_ss_init_budget.tv_sec = attr->budget.tv_sec;
- param.sched_ss_init_budget.tv_nsec = attr->budget.tv_nsec;
- #endif
- (void)nxsched_setscheduler(pid, attr->policy, ¶m);
- }
- return OK;
- }
- /****************************************************************************
- * Name: spawn_proxyattrs
- *
- * Description:
- * Set attributes of the proxy task before it has started the new child
- * task.
- *
- * Input Parameters:
- *
- * pid - The pid of the new task.
- * attr - The attributes to use
- * file_actions - The attributes to use
- *
- * Returned Value:
- * 0 (OK) on success; A negated errno value is returned on failure.
- *
- ****************************************************************************/
- int spawn_proxyattrs(FAR const posix_spawnattr_t *attr,
- FAR const posix_spawn_file_actions_t *file_actions)
- {
- FAR struct spawn_general_file_action_s *entry;
- int ret = OK;
- /* Check if we need to change the signal mask */
- if (attr != NULL && (attr->flags & POSIX_SPAWN_SETSIGMASK) != 0)
- {
- (void)nxsig_procmask(SIG_SETMASK, &attr->sigmask, NULL);
- }
- /* Were we also requested to perform file actions? */
- if (file_actions != NULL)
- {
- /* Yes.. Execute each file action */
- for (entry = (FAR struct spawn_general_file_action_s *)file_actions;
- entry && ret == OK;
- entry = entry->flink)
- {
- switch (entry->action)
- {
- case SPAWN_FILE_ACTION_CLOSE:
- ret = nxspawn_close((FAR struct spawn_close_file_action_s *)entry);
- break;
- case SPAWN_FILE_ACTION_DUP2:
- ret = nxspawn_dup2((FAR struct spawn_dup2_file_action_s *)entry);
- break;
- case SPAWN_FILE_ACTION_OPEN:
- ret = nxspawn_open((FAR struct spawn_open_file_action_s *)entry);
- break;
- case SPAWN_FILE_ACTION_NONE:
- default:
- serr("ERROR: Unknown action: %d\n", entry->action);
- ret = EINVAL;
- break;
- }
- }
- }
- return ret;
- }
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