Annotation of prex-old/usr/server/proc/exit.c, Revision 1.1
1.1 ! nbrk 1: /*
! 2: * Copyright (c) 2005-2006, Kohsuke Ohtani
! 3: * All rights reserved.
! 4: *
! 5: * Redistribution and use in source and binary forms, with or without
! 6: * modification, are permitted provided that the following conditions
! 7: * are met:
! 8: * 1. Redistributions of source code must retain the above copyright
! 9: * notice, this list of conditions and the following disclaimer.
! 10: * 2. Redistributions in binary form must reproduce the above copyright
! 11: * notice, this list of conditions and the following disclaimer in the
! 12: * documentation and/or other materials provided with the distribution.
! 13: * 3. Neither the name of the author nor the names of any co-contributors
! 14: * may be used to endorse or promote products derived from this software
! 15: * without specific prior written permission.
! 16: *
! 17: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
! 18: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 19: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 20: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
! 21: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 22: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 23: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 24: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 25: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 26: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 27: * SUCH DAMAGE.
! 28: */
! 29:
! 30: /*
! 31: * exit.c - process exit and wait
! 32: */
! 33:
! 34: #include <prex/prex.h>
! 35: #include <server/proc.h>
! 36: #include <sys/list.h>
! 37:
! 38: #include <unistd.h>
! 39: #include <errno.h>
! 40: #include <signal.h>
! 41:
! 42: #include "proc.h"
! 43:
! 44: /*
! 45: * Exit process.
! 46: *
! 47: * process_exit() sets the process state to zombie state, and it saves
! 48: * the exit code for waiting process.
! 49: */
! 50: int
! 51: proc_exit(struct msg *msg)
! 52: {
! 53: int exit_code;
! 54: struct proc *child, *parent;
! 55: list_t head, n;
! 56:
! 57: if (curproc == NULL)
! 58: return EINVAL;
! 59:
! 60: exit_code = msg->data[0];
! 61: dprintf("exit proc=%x task=%x code=%x\n", curproc,
! 62: msg->hdr.task, exit_code);
! 63:
! 64: if (curproc->stat == SZOMB)
! 65: return EBUSY;
! 66:
! 67: curproc->stat = SZOMB;
! 68: curproc->exit_code = exit_code;
! 69:
! 70: /*
! 71: * Set the parent pid of all child processes to 1 (init).
! 72: */
! 73: head = &curproc->children;
! 74: for (n = list_first(head); n != head; n = list_next(n)) {
! 75: child = list_entry(n, struct proc, sibling);
! 76: child->parent = &initproc;
! 77: list_insert(&initproc.children, &child->sibling);
! 78: }
! 79: /*
! 80: * Resume parent process which is wating in vfork.
! 81: */
! 82: parent = curproc->parent;
! 83: if (parent != NULL && parent->wait_vfork) {
! 84: vfork_end(parent);
! 85:
! 86: /*
! 87: * The child task loses its stack data.
! 88: * So, it can not run anymore.
! 89: */
! 90: task_terminate(curproc->task);
! 91: }
! 92:
! 93: /* Send a signal to the parent process. */
! 94: exception_raise(curproc->parent->task, SIGCHLD);
! 95: return 0;
! 96: }
! 97:
! 98: /*
! 99: * Stop process.
! 100: *
! 101: * This is similar with exit(), but it does not update the parent
! 102: * pid of any child processes.
! 103: */
! 104: int
! 105: proc_stop(struct msg *msg)
! 106: {
! 107: int code;
! 108:
! 109: if (curproc == NULL)
! 110: return EINVAL;
! 111:
! 112: code = msg->data[0];
! 113: dprintf("stop task=%x code=%x\n", msg->hdr.task, code);
! 114:
! 115: if (curproc->stat == SZOMB)
! 116: return EBUSY;
! 117:
! 118: curproc->stat = SSTOP;
! 119: curproc->exit_code = code;
! 120:
! 121: /* Send a signal to the parent process. */
! 122: exception_raise(curproc->parent->task, SIGCHLD);
! 123: return 0;
! 124: }
! 125:
! 126: /*
! 127: * Find the zombie process in the child processes. It just returns
! 128: * the pid and exit code if it find at least one zombie process.
! 129: *
! 130: * The library stub for waitpid() will wait the SIGCHLD signal in
! 131: * the stub code if there is no zombie process in child process.
! 132: * This signal is sent by proc_exit() or proc_stop() routines in
! 133: * the process server.
! 134: */
! 135: int
! 136: proc_waitpid(struct msg *msg)
! 137: {
! 138: pid_t pid, pid_child;
! 139: int options, code;
! 140: struct proc *p;
! 141: list_t head, n;
! 142:
! 143: if (curproc == NULL)
! 144: return EINVAL;
! 145:
! 146: pid = (pid_t)msg->data[0];
! 147: options = msg->data[1];
! 148: dprintf("wait task=%x pid=%x options=%x\n",
! 149: msg->hdr.task, pid, options);
! 150:
! 151: if (list_empty(&curproc->children))
! 152: return ECHILD; /* No child process */
! 153:
! 154: /* Set the default pid and exit code */
! 155: pid_child = 0;
! 156: code = 0;
! 157:
! 158: /*
! 159: * Check all processes.
! 160: */
! 161: p = NULL;
! 162: head = &curproc->children;
! 163: for (n = list_first(head); n != head; n = list_next(n)) {
! 164: p = list_entry(n, struct proc, sibling);
! 165:
! 166: /*
! 167: * Check if pid matches.
! 168: */
! 169: if (pid > 0) {
! 170: if (p->pid != pid)
! 171: continue;
! 172: } else if (pid == 0) {
! 173: if (p->pgrp->pgid != curproc->pgrp->pgid)
! 174: continue;
! 175: } else if (pid != -1) {
! 176: if (p->pgrp->pgid != -pid)
! 177: continue;
! 178: }
! 179: /*
! 180: * Get the exit code.
! 181: */
! 182: if (p->stat == SSTOP) {
! 183: pid_child = p->pid;
! 184: code = p->exit_code;
! 185: break;
! 186: } else if (p->stat == SZOMB) {
! 187: pid_child = p->pid;
! 188: code = p->exit_code;
! 189: proc_cleanup(p);
! 190: break;
! 191: }
! 192: }
! 193: msg->data[0] = pid_child;
! 194: msg->data[1] = code;
! 195: return 0;
! 196: }
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