/*
* Copyright (c) 2011 Petr Koupy
* Copyright (c) 2011 Jiri Zarevucky
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - 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.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
/** @addtogroup libposix
* @{
*/
/** @file Support for waiting.
*/
#include "../internal/common.h"
#include <sys/wait.h>
#include <task.h>
#include <assert.h>
#include <errno.h>
#include <limits.h>
#include <signal.h>
int __posix_wifexited(int status)
{
return status != INT_MIN;
}
int __posix_wexitstatus(int status)
{
assert(__posix_wifexited(status));
return status;
}
int __posix_wifsignaled(int status)
{
return status == INT_MIN;
}
int __posix_wtermsig(int status)
{
assert(__posix_wifsignaled(status));
/*
* There is no way to distinguish reason
* for unexpected termination at the moment.
*/
return SIGABRT;
}
/**
* Wait for any child process to stop or terminate.
*
* @param stat_ptr Location of the final status code of the child process.
* @return ID of the child process for which status is reported,
* -1 on signal interrupt, (pid_t)-1 otherwise.
*/
pid_t wait(int *stat_ptr)
{
/* HelenOS does not support this. */
errno = ENOSYS;
return (pid_t) -1;
}
/**
* Wait for a child process to stop or terminate.
*
* @param pid What child process shall the caller wait for. See POSIX manual
* for details.
* @param stat_ptr Location of the final status code of the child process.
* @param options Constraints of the waiting. See POSIX manual for details.
* @return ID of the child process for which status is reported,
* -1 on signal interrupt, 0 if non-blocking wait is requested but there is
* no child process whose status can be reported, (pid_t)-1 otherwise.
*/
pid_t waitpid(pid_t pid, int *stat_ptr, int options)
{
assert(stat_ptr != NULL);
assert(options == 0 /* None of the options are supported. */);
task_exit_t texit;
int retval;
if (failed(task_wait_task_id((task_id_t) pid, &texit, &retval))) {
/* Unable to retrieve status. */
return (pid_t) -1;
}
if (texit == TASK_EXIT_NORMAL) {
// FIXME: relies on application not returning this value
assert(retval != INT_MIN);
*stat_ptr = retval;
} else {
/* Reserve the lowest value for unexpected termination. */
*stat_ptr = INT_MIN;
}
return pid;
}
/** @}
*/