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Diffstat (limited to 'nuttx/sched/task_spawnparms.c')
-rw-r--r-- | nuttx/sched/task_spawnparms.c | 340 |
1 files changed, 340 insertions, 0 deletions
diff --git a/nuttx/sched/task_spawnparms.c b/nuttx/sched/task_spawnparms.c new file mode 100644 index 000000000..25cb86531 --- /dev/null +++ b/nuttx/sched/task_spawnparms.c @@ -0,0 +1,340 @@ +/**************************************************************************** + * sched/task_spawnparms.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 <semaphore.h> +#include <fcntl.h> +#include <spawn.h> +#include <debug.h> + +#include <nuttx/spawn.h> + +#include "spawn_internal.h" + +/**************************************************************************** + * Private Types + ****************************************************************************/ + +/**************************************************************************** + * 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 Data + ****************************************************************************/ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: spawn_close, spawn_dup2, and spawn_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 spawn_close(FAR struct spawn_close_file_action_s *action) +{ + /* The return value from close() is ignored */ + + svdbg("Closing fd=%d\n", action->fd); + + (void)close(action->fd); + return OK; +} + +static inline int spawn_dup2(FAR struct spawn_dup2_file_action_s *action) +{ + int ret; + + /* Perform the dup */ + + svdbg("Dup'ing %d->%d\n", action->fd1, action->fd2); + + ret = dup2(action->fd1, action->fd2); + if (ret < 0) + { + int errcode = errno; + + sdbg("ERROR: dup2 failed: %d\n", errcode); + return errcode; + } + + return OK; +} + +static inline int spawn_open(FAR struct spawn_open_file_action_s *action) +{ + int fd; + int ret = OK; + + /* Open the file */ + + svdbg("Open'ing path=%s oflags=%04x mode=%04x\n", + action->path, action->oflags, action->mode); + + fd = open(action->path, action->oflags, action->mode); + if (fd < 0) + { + ret = errno; + sdbg("ERROR: open failed: %d\n", ret); + } + + /* Does the return file descriptor happen to match the required file + * desciptor number? + */ + + else if (fd != action->fd) + { + /* No.. dup2 to get the correct file number */ + + svdbg("Dup'ing %d->%d\n", fd, action->fd); + + ret = dup2(fd, action->fd); + if (ret < 0) + { + ret = errno; + sdbg("ERROR: dup2 failed: %d\n", ret); + } + + svdbg("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 = sem_wait(sem); + ASSERT(ret == 0 || errno == EINTR); + } + while (ret != 0); +} + +/**************************************************************************** + * 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 because errors + * cannot occur, but ratther 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; + + 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) + { + /* Get the priority from the attrributes */ + + param.sched_priority = attr->priority; + + /* If we are setting *both* the priority and the scheduler, + * then we will call sched_setscheduler() below. + */ + + if ((attr->flags & POSIX_SPAWN_SETSCHEDULER) == 0) + { + svdbg("Setting priority=%d for pid=%d\n", + param.sched_priority, pid); + + (void)sched_setparam(pid, ¶m); + } + } + + /* 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 sched_setscheduler() call below. + */ + + else if ((attr->flags & POSIX_SPAWN_SETSCHEDULER) != 0) + { + (void)sched_getparam(0, ¶m); + } + + /* Are we setting the scheduling policy? If so, use the priority + * setting determined above. + */ + + if ((attr->flags & POSIX_SPAWN_SETSCHEDULER) != 0) + { + svdbg("Setting policy=%d priority=%d for pid=%d\n", + attr->policy, param.sched_priority, pid); + + (void)sched_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 successed; 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 */ + +#ifndef CONFIG_DISABLE_SIGNALS + if (attr && (attr->flags & POSIX_SPAWN_SETSIGMASK) != 0) + { + (void)sigprocmask(SIG_SETMASK, &attr->sigmask, NULL); + } + + /* Were we also requested to perform file actions? */ + + if (file_actions) +#endif + { + /* 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 = spawn_close((FAR struct spawn_close_file_action_s *)entry); + break; + + case SPAWN_FILE_ACTION_DUP2: + ret = spawn_dup2((FAR struct spawn_dup2_file_action_s *)entry); + break; + + case SPAWN_FILE_ACTION_OPEN: + ret = spawn_open((FAR struct spawn_open_file_action_s *)entry); + break; + + case SPAWN_FILE_ACTION_NONE: + default: + sdbg("ERROR: Unknown action: %d\n", entry->action); + ret = EINVAL; + break; + } + } + } + + return ret; +} |