scoutos / prex-0.9.0 / usr / server / proc / proc_exit.c @ 03e9c04a
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/*
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* Copyright (c) 2005-2008, Kohsuke Ohtani
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* All rights reserved.
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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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* 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 the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the names of any co-contributors
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* may be 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 AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* exit.c - process exit and wait
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*/
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#include <sys/prex.h> |
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#include <ipc/proc.h> |
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#include <sys/list.h> |
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#include <unistd.h> |
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#include <errno.h> |
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#include <signal.h> |
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#include "proc.h" |
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/*
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* Exit process.
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*
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* process_exit() sets the process state to zombie state, and it
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* saves the exit code for waiting process.
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*/
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int
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sys_exit(int exitcode)
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{ |
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struct proc *child, *parent;
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list_t head, n; |
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int error;
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DPRINTF(("proc: exit pid=%d code=%x\n", curproc->p_pid, exitcode));
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if (curproc->p_stat == SZOMB)
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return EBUSY;
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/*
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* Enter zombie state.
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*/
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curproc->p_stat = SZOMB; |
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curproc->p_exitcode = exitcode; |
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p_remove(curproc); |
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/*
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* Set the parent pid of all child processes to 1 (init).
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*/
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head = &curproc->p_children; |
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n = list_first(head); |
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while (n != head) {
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child = list_entry(n, struct proc, p_sibling);
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n = list_next(n); |
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child->p_parent = &initproc; |
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list_remove(&child->p_sibling); |
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list_insert(&initproc.p_children, &child->p_sibling); |
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} |
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/*
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* Resume parent process which is wating in vfork.
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*/
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parent = curproc->p_parent; |
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if (parent != NULL && parent->p_vforked) { |
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vfork_end(parent); |
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/*
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* The child task loses its stack data.
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* So, it can not run anymore.
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*/
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error = task_terminate(curproc->p_task); |
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if (error)
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sys_panic("proc: can not terminate a task for exit");
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} |
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/* Send a signal to the parent process. */
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DPRINTF(("proc: exit send SIGCHLD to pid=%d\n",
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curproc->p_parent->p_pid)); |
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exception_raise(curproc->p_parent->p_task, SIGCHLD); |
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return 0; |
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} |
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/*
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* Stop process.
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*
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* This is similar with exit(), but it does not update the parent
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* pid of any child processes.
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*/
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int
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stop(int exitcode)
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{ |
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DPRINTF(("proc: stop code=%x\n", exitcode));
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if (curproc->p_stat == SZOMB)
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return EBUSY;
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curproc->p_stat = SSTOP; |
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curproc->p_exitcode = exitcode; |
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/* Send a signal to the parent process. */
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exception_raise(curproc->p_parent->p_task, SIGCHLD); |
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return 0; |
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} |
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/*
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* Find the zombie process in the child processes. It just
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* returns the pid and exit code if it find at least one zombie
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* process.
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*
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* The library stub for waitpid() will wait the SIGCHLD signal in
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* the stub code if there is no zombie process in child process.
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* This signal is sent by proc_exit() or proc_stop() routines in
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* the process server.
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*/
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int
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sys_waitpid(pid_t pid, int *status, int options, pid_t *retval) |
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{ |
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pid_t pid_child; |
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int code, match;
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struct proc *p;
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list_t head, n; |
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DPRINTF(("proc: wait pid=%d options=%x\n", pid, options));
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if (list_empty(&curproc->p_children))
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return ECHILD; /* No child process */ |
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/* Set the default pid and exit code */
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pid_child = 0;
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code = 0;
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/*
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* Check all processes.
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*/
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p = NULL;
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head = &curproc->p_children; |
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for (n = list_first(head); n != head; n = list_next(n)) {
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p = list_entry(n, struct proc, p_sibling);
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/*
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* Check if pid matches.
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*/
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match = 0;
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if (pid > 0) { |
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/*
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* Wait a specific child process.
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*/
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if (p->p_pid == pid)
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match = 1;
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} else if (pid == 0) { |
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/*
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* Wait a process who has same pgid.
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*/
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if (p->p_pgrp->pg_pgid == curproc->p_pgrp->pg_pgid)
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match = 1;
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} else if (pid != -1) { |
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/*
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* Wait a specific pgid.
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*/
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if (p->p_pgrp->pg_pgid == -pid)
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match = 1;
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} else {
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/*
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* pid = -1 means wait any child process.
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*/
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match = 1;
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} |
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if (match) {
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/*
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* Get the exit code.
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*/
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if (p->p_stat == SSTOP) {
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pid_child = p->p_pid; |
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code = p->p_exitcode; |
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break;
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} else if (p->p_stat == SZOMB) { |
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pid_child = p->p_pid; |
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code = p->p_exitcode; |
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cleanup(p); |
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break;
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} |
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} |
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} |
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*status = code; |
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*retval = pid_child; |
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return 0; |
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} |