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 (c) 1995-1997, by Sun Microsystems, Inc.
24 * All rights reserved.
25 */
26
27 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
28 /* All Rights Reserved */
29
30
31 /* Portions Copyright(c) 1988, Sun Microsystems Inc. */
32 /* All Rights Reserved */
33
34 #pragma ident "%Z%%M% %I% %E% SMI" /* SVr4.0 1.1 */
35
36 /*LINTLIBRARY*/
37
38 /*
39 * Compatibility lib for SunOS's wait4().
40 */
41
42 #include <sys/types.h>
43 #include <sys/time.h>
44 #include <sys/times.h>
45 #include <sys/wait.h>
46 #include <sys/siginfo.h>
47 #include <sys/procset.h>
48 #include <sys/param.h>
49 #include <sys/resource.h>
50 #include <unistd.h>
51 #include <string.h>
52 #include <errno.h>
53
54 /*
55 * Since sysV does not support rusage as in BSD, an approximate approach
56 * is:
57 * ...
58 * call times
59 * call waitid
60 * if ( a child is found )
61 * call times again
62 * rusage ~= diff in the 2 times call
63 * ...
64 */
65
66 /*
67 * forward declaration
68 */
69 static int wstat(int, int);
70
71 pid_t
wait4(pid_t pid,int * status,int options,struct rusage * rp)72 wait4(pid_t pid, int *status, int options, struct rusage *rp)
73 {
74 struct tms before_tms;
75 struct tms after_tms;
76 siginfo_t info;
77 int error;
78 int noptions;
79 idtype_t idtype;
80
81 if ((long)status == -1L || (long)rp == -1L) {
82 errno = EFAULT;
83 return (-1);
84 }
85
86 if (rp)
87 (void) memset(rp, 0, sizeof (struct rusage));
88 (void) memset(&info, 0, sizeof (siginfo_t));
89 if (times(&before_tms) < 0)
90 return (-1); /* errno is set by times() */
91
92 /*
93 * SunOS's wait4() only supports WNOHANG & WUNTRACED
94 */
95 if (options & ~(WNOHANG|WUNTRACED))
96 return (EINVAL); /* used to be done by the kernel */
97 noptions = options | WEXITED | WTRAPPED;
98
99 /*
100 * Emulate undocumented 4.x semantics for 1186845
101 */
102 if (pid < 0) {
103 pid = -pid;
104 idtype = P_PGID;
105 } else if (pid == 0)
106 idtype = P_ALL;
107 else
108 idtype = P_PID;
109
110 error = waitid(idtype, pid, &info, noptions);
111 if (error == 0) {
112 clock_t diffu; /* difference in usertime (ticks) */
113 clock_t diffs; /* difference in systemtime (ticks) */
114
115 if ((options & WNOHANG) && (info.si_pid == 0))
116 return (0); /* no child found */
117
118 if (rp) {
119 if (times(&after_tms) < 0)
120 return (-1); /* errno set by times() */
121 /*
122 * The system/user time is an approximation only !!!
123 */
124 diffu = after_tms.tms_cutime - before_tms.tms_cutime;
125 diffs = after_tms.tms_cstime - before_tms.tms_cstime;
126 rp->ru_utime.tv_sec = diffu / HZ;
127 rp->ru_utime.tv_usec = (diffu % HZ) * (1000000 / HZ);
128 rp->ru_stime.tv_sec = diffs/ HZ;
129 rp->ru_stime.tv_usec = (diffs % HZ) * (1000000 / HZ);
130 }
131 if (status)
132 *status = wstat(info.si_code, info.si_status);
133 return (info.si_pid);
134 } else {
135 return (-1); /* error number is set by waitid() */
136 }
137 }
138
139 /*
140 * Convert the status code to old style wait status
141 */
142 static int
wstat(int code,int status)143 wstat(int code, int status)
144 {
145 int stat = (status & 0377);
146
147 switch (code) {
148 case CLD_EXITED:
149 stat <<= 8;
150 break;
151 case CLD_DUMPED:
152 stat |= WCOREFLG;
153 break;
154 case CLD_KILLED:
155 break;
156 case CLD_TRAPPED:
157 case CLD_STOPPED:
158 stat <<= 8;
159 stat |= WSTOPFLG;
160 break;
161 case CLD_CONTINUED:
162 stat = WCONTFLG;
163 break;
164 }
165 return (stat);
166 }
167