Annotation of prex-old/usr/server/proc/exit.c, Revision 1.1.1.1.2.1
1.1 nbrk 1: /*
1.1.1.1.2.1! nbrk 2: * Copyright (c) 2005-2008, Kohsuke Ohtani
1.1 nbrk 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: *
1.1.1.1.2.1! nbrk 47: * process_exit() sets the process state to zombie state, and it
! 48: * saves the exit code for waiting process.
1.1 nbrk 49: */
50: int
51: proc_exit(struct msg *msg)
52: {
1.1.1.1.2.1! nbrk 53: int exitcode;
1.1 nbrk 54: struct proc *child, *parent;
55: list_t head, n;
56:
57: if (curproc == NULL)
58: return EINVAL;
59:
1.1.1.1.2.1! nbrk 60: exitcode = msg->data[0];
! 61: DPRINTF(("exit pid=%d task=%x code=%x\n", curproc->p_pid,
! 62: msg->hdr.task, exitcode));
1.1 nbrk 63:
1.1.1.1.2.1! nbrk 64: if (curproc->p_stat == SZOMB)
1.1 nbrk 65: return EBUSY;
66:
1.1.1.1.2.1! nbrk 67: curproc->p_stat = SZOMB;
! 68: curproc->p_exitcode = exitcode;
1.1 nbrk 69:
70: /*
71: * Set the parent pid of all child processes to 1 (init).
72: */
1.1.1.1.2.1! nbrk 73: head = &curproc->p_children;
! 74: n = list_first(head);
! 75: while (n != head) {
! 76: child = list_entry(n, struct proc, p_sibling);
! 77: n = list_next(n);
! 78:
! 79: child->p_parent = &initproc;
! 80: list_remove(&child->p_sibling);
! 81: list_insert(&initproc.p_children, &child->p_sibling);
1.1 nbrk 82: }
1.1.1.1.2.1! nbrk 83:
1.1 nbrk 84: /*
85: * Resume parent process which is wating in vfork.
86: */
1.1.1.1.2.1! nbrk 87: parent = curproc->p_parent;
! 88: if (parent != NULL && parent->p_vforked) {
1.1 nbrk 89: vfork_end(parent);
90:
91: /*
92: * The child task loses its stack data.
93: * So, it can not run anymore.
94: */
1.1.1.1.2.1! nbrk 95: task_terminate(curproc->p_task);
1.1 nbrk 96: }
97:
98: /* Send a signal to the parent process. */
1.1.1.1.2.1! nbrk 99: exception_raise(curproc->p_parent->p_task, SIGCHLD);
1.1 nbrk 100: return 0;
101: }
102:
103: /*
104: * Stop process.
105: *
106: * This is similar with exit(), but it does not update the parent
107: * pid of any child processes.
108: */
109: int
110: proc_stop(struct msg *msg)
111: {
112: int code;
113:
114: if (curproc == NULL)
115: return EINVAL;
116:
117: code = msg->data[0];
1.1.1.1.2.1! nbrk 118: DPRINTF(("stop task=%x code=%x\n", msg->hdr.task, code));
1.1 nbrk 119:
1.1.1.1.2.1! nbrk 120: if (curproc->p_stat == SZOMB)
1.1 nbrk 121: return EBUSY;
122:
1.1.1.1.2.1! nbrk 123: curproc->p_stat = SSTOP;
! 124: curproc->p_exitcode = code;
1.1 nbrk 125:
126: /* Send a signal to the parent process. */
1.1.1.1.2.1! nbrk 127: exception_raise(curproc->p_parent->p_task, SIGCHLD);
1.1 nbrk 128: return 0;
129: }
130:
131: /*
1.1.1.1.2.1! nbrk 132: * Find the zombie process in the child processes. It just
! 133: * returns the pid and exit code if it find at least one zombie
! 134: * process.
1.1 nbrk 135: *
136: * The library stub for waitpid() will wait the SIGCHLD signal in
137: * the stub code if there is no zombie process in child process.
138: * This signal is sent by proc_exit() or proc_stop() routines in
139: * the process server.
140: */
141: int
142: proc_waitpid(struct msg *msg)
143: {
144: pid_t pid, pid_child;
1.1.1.1.2.1! nbrk 145: int options, code, match;
1.1 nbrk 146: struct proc *p;
147: list_t head, n;
148:
149: if (curproc == NULL)
150: return EINVAL;
151:
152: pid = (pid_t)msg->data[0];
153: options = msg->data[1];
1.1.1.1.2.1! nbrk 154: DPRINTF(("wait task=%x pid=%d options=%x\n", msg->hdr.task,
! 155: pid, options));
1.1 nbrk 156:
1.1.1.1.2.1! nbrk 157: if (list_empty(&curproc->p_children))
1.1 nbrk 158: return ECHILD; /* No child process */
159:
160: /* Set the default pid and exit code */
161: pid_child = 0;
162: code = 0;
163:
164: /*
165: * Check all processes.
166: */
167: p = NULL;
1.1.1.1.2.1! nbrk 168: head = &curproc->p_children;
1.1 nbrk 169: for (n = list_first(head); n != head; n = list_next(n)) {
1.1.1.1.2.1! nbrk 170: p = list_entry(n, struct proc, p_sibling);
1.1 nbrk 171:
172: /*
173: * Check if pid matches.
174: */
1.1.1.1.2.1! nbrk 175: match = 0;
1.1 nbrk 176: if (pid > 0) {
1.1.1.1.2.1! nbrk 177: /*
! 178: * Wait a specific child process.
! 179: */
! 180: if (p->p_pid == pid)
! 181: match = 1;
1.1 nbrk 182: } else if (pid == 0) {
1.1.1.1.2.1! nbrk 183: /*
! 184: * Wait a process who has same pgid.
! 185: */
! 186: if (p->p_pgrp->pg_pgid == curproc->p_pgrp->pg_pgid)
! 187: match = 1;
1.1 nbrk 188: } else if (pid != -1) {
1.1.1.1.2.1! nbrk 189: /*
! 190: * Wait a specific pgid.
! 191: */
! 192: if (p->p_pgrp->pg_pgid == -pid)
! 193: match = 1;
! 194: } else {
! 195: /*
! 196: * pid = -1 means wait any child process.
! 197: */
! 198: match = 1;
1.1 nbrk 199: }
1.1.1.1.2.1! nbrk 200: if (match) {
! 201: /*
! 202: * Get the exit code.
! 203: */
! 204: if (p->p_stat == SSTOP) {
! 205: pid_child = p->p_pid;
! 206: code = p->p_exitcode;
! 207: break;
! 208: } else if (p->p_stat == SZOMB) {
! 209: pid_child = p->p_pid;
! 210: code = p->p_exitcode;
! 211: proc_cleanup(p);
! 212: break;
! 213: }
1.1 nbrk 214: }
215: }
216: msg->data[0] = pid_child;
217: msg->data[1] = code;
218: return 0;
219: }
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