1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22 /*
23 * Copyright 2003 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 #pragma ident "%Z%%M% %I% %E% SMI"
28
29 #include <stdio.h>
30 #include <stdlib.h>
31 #include <unistd.h>
32 #include <fcntl.h>
33 #include <ctype.h>
34 #include <string.h>
35 #include <signal.h>
36 #include <errno.h>
37 #include <sys/types.h>
38 #include <sys/wait.h>
39 #include <libproc.h>
40
41 #define NOREAP_TIME 60 /* wait 60 seconds before allow a reap */
42
43 static volatile int interrupt;
44 static int Fflag;
45 static char *command;
46
47 static void
48 intr(int sig)
49 {
50 interrupt = sig;
51 }
52
53 static int
54 open_usage(pid_t pid, int *perr)
55 {
56 char path[64];
57 struct stat64 st;
58 int fd;
59
60 (void) snprintf(path, sizeof (path), "/proc/%d/usage", (int)pid);
61
62 /*
63 * Attempt to open the usage file, and return the fd if we can
64 * confirm this is a regular file provided by /proc.
65 */
66 if ((fd = open64(path, O_RDONLY)) >= 0) {
67 if (fstat64(fd, &st) != 0 || !S_ISREG(st.st_mode) ||
68 strcmp(st.st_fstype, "proc") != 0) {
69 (void) close(fd);
70 fd = -1;
71 }
72 } else if (errno == EACCES || errno == EPERM)
73 *perr = G_PERM;
74
75 return (fd);
76 }
77
78 static int
79 proc_usage(pid_t pid, prusage_t *pup, int *perr)
80 {
81 int fd;
82
83 *perr = G_NOPROC;
84
85 if ((fd = open_usage(pid, perr)) != -1) {
86 if (read(fd, pup, sizeof (prusage_t)) == sizeof (prusage_t)) {
87 *perr = 0;
88 (void) close(fd);
89 return (0);
90 }
91
92 /*
93 * If the read failed, the process may have gone away.
94 */
95 (void) close(fd);
96 }
97 return (-1);
98 }
99
100 /*
101 * Force the parent process (ppid) to wait for its child process (pid).
102 */
103 static int
104 reap(char *arg, pid_t *reap_pid, int *exit_status)
105 {
106 struct ps_prochandle *Pr;
107 siginfo_t siginfo;
108 psinfo_t psinfo;
109 prusage_t usage;
110 pid_t pid, ppid;
111 time_t elapsed;
112 int gret;
113
114 /*
115 * get the specified pid and the psinfo struct
116 */
117 if ((pid = proc_arg_psinfo(arg, PR_ARG_PIDS, &psinfo, &gret)) == -1) {
118 (void) fprintf(stderr, "%s: cannot examine %s: %s\n",
119 command, arg, Pgrab_error(gret));
120 return (1);
121 }
122
123 if (psinfo.pr_nlwp != 0) {
124 (void) fprintf(stderr, "%s: process not defunct: %d\n",
125 command, (int)pid);
126 return (1);
127 }
128
129 *exit_status = psinfo.pr_wstat;
130 *reap_pid = psinfo.pr_pid;
131 ppid = psinfo.pr_ppid;
132
133 if (ppid == 1) {
134 (void) fprintf(stderr, "%s: Failed to reap %d: the only "
135 "non-defunct ancestor is 'init'\n", command,
136 (int)pid);
137 return (1);
138 }
139
140 if (proc_usage(pid, &usage, &gret) == 0) {
141 elapsed = usage.pr_tstamp.tv_sec - usage.pr_term.tv_sec;
142 } else {
143 (void) fprintf(stderr, "%s: cannot examine %d: %s\n",
144 command, (int)pid, Pgrab_error(gret));
145 return (1);
146 }
147
148 if ((Fflag == 0) && (elapsed < NOREAP_TIME)) {
149 (void) fprintf(stderr, "%s: unsafe to reap %d; it has been "
150 "defunct less than %d seconds\n", command, (int)pid,
151 NOREAP_TIME);
152 return (1);
153 }
154
155 if ((Pr = Pgrab(ppid, Fflag | PGRAB_NOSTOP, &gret)) == NULL) {
156 (void) fprintf(stderr, "%s: cannot examine %d: %s\n", command,
157 (int)ppid, Pgrab_error(gret));
158 return (1);
159 }
160
161 if ((Fflag == 0) && (Pstate(Pr) == PS_STOP)) {
162 Prelease(Pr, 0);
163 (void) fprintf(stderr, "%s: unsafe to reap %d; parent is "
164 "stopped and may reap status upon restart\n", command,
165 (int)pid);
166 return (1);
167 }
168
169 /*
170 * Pstop() will fail if the process to be stopped has become a zombie.
171 * This means that we can say with certainty that the child of this
172 * process has not changed parents (i.e. been reparented to init) once
173 * the Pstop() succeeds.
174 */
175 if (Pstop(Pr, 1000) != 0) {
176 Prelease(Pr, 0);
177 (void) fprintf(stderr, "%s: failed to stop %d: %s", command,
178 (int)ppid, strerror(errno));
179 return (1);
180 }
181
182 if (pr_waitid(Pr, P_PID, pid, &siginfo, WEXITED|WNOHANG) != 0) {
183 Prelease(Pr, 0);
184 (void) fprintf(stderr, "%s: waitid() in process %d failed: %s",
185 command, (int)ppid, strerror(errno));
186 return (1);
187 }
188
189 Prelease(Pr, 0);
190 return (0);
191 }
192
193 static void
194 print_exit_status(pid_t pid, int wstat)
195 {
196 (void) printf("%d: ", (int)pid);
197 if (WIFSIGNALED(wstat)) {
198 char buf[SIG2STR_MAX];
199 int sig = WTERMSIG(wstat);
200
201 if (sig2str(sig, buf) == 0)
202 (void) printf("killed by signal %s", buf);
203 else
204 (void) printf("killed by signal %d", sig);
205
206 if (WCOREDUMP(wstat))
207 (void) printf(" (core dumped)");
208 } else {
209 (void) printf("exited with status %d", WEXITSTATUS(wstat));
210 }
211 (void) printf("\n");
212 }
213
214 int
215 main(int argc, char *argv[])
216 {
217 int retc = 0;
218 int opt;
219 int errflg = 0;
220
221 if ((command = strrchr(argv[0], '/')) != NULL)
222 command++;
223 else
224 command = argv[0];
225
226 while ((opt = getopt(argc, argv, "F")) != EOF) {
227 switch (opt) {
228 case 'F': /* force grabbing (no O_EXCL) */
229 Fflag = PGRAB_FORCE;
230 break;
231 default:
232 errflg = 1;
233 break;
234 }
235 }
236
237 argc -= optind;
238 argv += optind;
239
240 if (errflg || argc <= 0) {
241 (void) fprintf(stderr, "usage: %s pid ...\n", command);
242 (void) fprintf(stderr, " (Reap a defunct process by forcing "
243 "its parent to wait(2) for it)\n");
244 exit(2);
245 }
246
247 /* catch signals from terminal */
248 if (sigset(SIGHUP, SIG_IGN) == SIG_DFL)
249 (void) sigset(SIGHUP, intr);
250 if (sigset(SIGINT, SIG_IGN) == SIG_DFL)
251 (void) sigset(SIGINT, intr);
252 if (sigset(SIGPIPE, SIG_IGN) == SIG_DFL)
253 (void) sigset(SIGPIPE, intr);
254 if (sigset(SIGQUIT, SIG_IGN) == SIG_DFL)
255 (void) sigset(SIGQUIT, intr);
256 (void) sigset(SIGTERM, intr);
257
258 while (--argc >= 0 && !interrupt) {
259 pid_t pid;
260 int wstat, r;
261
262 retc += r = reap(*argv++, &pid, &wstat);
263
264 if (r == 0)
265 print_exit_status(pid, wstat);
266 }
267
268 if (interrupt && retc == 0)
269 retc++;
270 return (retc == 0 ? 0 : 1);
271 }