Annotation of prex-old/usr/server/proc/kill.c, Revision 1.1.1.1
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: * kill.c - signal transfer.
32: */
33:
34: #include <prex/prex.h>
35: #include <prex/capability.h>
36: #include <server/proc.h>
37: #include <sys/list.h>
38:
39: #include <unistd.h>
40: #include <errno.h>
41:
42: #include "proc.h"
43:
44: /*
45: * Send a signal to the task.
46: */
47: static int
48: send_sig(struct proc *proc, int sig)
49: {
50:
51: if (proc->pid == 0 || proc->pid == 1)
52: return EPERM;
53: return exception_raise(proc->task, sig);
54: }
55:
56: /*
57: * Send a signal to one process.
58: */
59: static int
60: kill_one(pid_t pid, int sig)
61: {
62: struct proc *p;
63:
64: dprintf("killone pid=%x sig=%d\n", pid, sig);
65: if ((p = proc_find(pid)) == NULL)
66: return ESRCH;
67: return send_sig(p, sig);
68: }
69:
70: /*
71: * Send signal to all process in the process group.
72: */
73: int
74: kill_pg(pid_t pgid, int sig)
75: {
76: struct proc *p;
77: struct pgrp *pgrp;
78: list_t head, n;
79: int err = 0;
80:
81: dprintf("killpg pgid=%x sig=%d\n", pgid, sig);
82:
83: if ((pgrp = pgrp_find(pgid)) == NULL)
84: return ESRCH;
85:
86: head = &pgrp->members;
87: for (n = list_first(head); n != head; n = list_next(n)) {
88: p = list_entry(n, struct proc, pgrp_link);
89: if ((err = send_sig(p, sig)) != 0)
90: break;
91: }
92: return err;
93: }
94:
95: /*
96: * Send a signal.
97: *
98: * The behavior is different for the pid value.
99: *
100: * if (pid > 0)
101: * Send a signal to specific process.
102: *
103: * if (pid == 0)
104: * Send a signal to all processes in same process group.
105: *
106: * if (pid == -1)
107: * Send a signal to all processes except init.
108: *
109: * if (pid < -1)
110: * Send a signal to the process group.
111: *
112: * Note: Need CAP_KILL capability to send a signal to the different
113: * process/group.
114: */
115: int
116: proc_kill(struct msg *msg)
117: {
118: pid_t pid;
119: struct proc *p;
120: list_t n;
121: int sig, capable = 0;
122: int err = 0;
123:
124: pid = (pid_t)msg->data[0];
125: sig = msg->data[1];
126:
127: dprintf("kill pid=%x sig=%d\n", pid, sig);
128:
129: switch (sig) {
130: case SIGFPE:
131: case SIGILL:
132: case SIGSEGV:
133: return EINVAL;
134: }
135:
136: if (curproc->cap & CAP_KILL)
137: capable = 1;
138:
139: if (pid > 0) {
140: if (pid != curproc->pid && !capable)
141: return EPERM;
142: err = kill_one(pid, sig);
143: }
144: else if (pid == -1) {
145: if (!capable)
146: return EPERM;
147: for (n = list_first(&allproc); n != &allproc;
148: n = list_next(n)) {
149: p = list_entry(n, struct proc, link);
150: if (p->pid != 0 && p->pid != 1) {
151: err = kill_one(p->pid, sig);
152: if (err != 0)
153: break;
154: }
155: }
156: }
157: else if (pid == 0) {
158: if ((p = proc_find(pid)) == NULL)
159: return ESRCH;
160: err = kill_pg(p->pgrp->pgid, sig);
161: }
162: else {
163: if (curproc->pgrp->pgid != -pid && !capable)
164: return EPERM;
165: err = kill_pg(-pid, sig);
166: }
167: return err;
168: }
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