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comparison usr/src/cmd/csh/wait3.c @ 0:c9caec207d52 b86

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Initial porting based on b86
author Koji Uno <koji.uno@sun.com>
date Tue, 02 Jun 2009 18:56:50 +0900
parents
children 1a15d5aaf794
comparison
equal deleted inserted replaced
-1:000000000000 0:c9caec207d52
1 /*
2 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
3 * Use is subject to license terms.
4 */
5
6 /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
7 /* All Rights Reserved */
8
9 /*
10 * Copyright (c) 1980 Regents of the University of California.
11 * All rights reserved. The Berkeley Software License Agreement
12 * specifies the terms and conditions for redistribution.
13 */
14
15 #pragma ident "@(#)wait3.c 1.8 06/06/12 SMI"
16
17 /*
18 * Compatibility lib for BSD's wait3(). It is not
19 * binary compatible, since BSD's WNOHANG and WUNTRACED
20 * carry different #define values.
21 */
22 #include <errno.h>
23 #include <sys/types.h>
24 #include <sys/time.h>
25 #include <sys/times.h>
26 #include <wait.h>
27 #include <sys/siginfo.h>
28 #include <sys/procset.h>
29 #include <sys/param.h>
30 #include <sys/resource.h>
31
32 /*
33 * Since sysV does not support rusage as in BSD, an approximate approach
34 * is:
35 * ...
36 * call times
37 * call waitid
38 * if ( a child is found )
39 * call times again
40 * rusage ~= diff in the 2 times call
41 * ...
42 *
43 */
44
45 /*
46 * XXX: There is now a wait3 function in libc which should be used instead
47 * of this local version of wait3. With the addition of a wait3 prototype
48 * in <sys/wait.h> as per the X/Open XPG4v2 specification, compilation of
49 * the csh utility will result in warnings, hence the renaming of the local
50 * version. Using the libc wait3 rather than the local version results in
51 * a failure with csh, however, this version should eventually be dropped
52 * in favor of the libc wait3 with appropriate updates made to sh.proc.c
53 * to account for the difference in implementation of the local versus
54 * the libc versions. This should probably be done as part of an overall
55 * effort to rid csh of local versions of functions now in libc.
56 */
57
58 static int wstat(int code, int status);
59
60 pid_t
61 csh_wait3(int *status, int options, struct rusage *rp)
62 {
63 struct tms before_tms;
64 struct tms after_tms;
65 siginfo_t info;
66 int error;
67
68 if (rp)
69 memset((void *)rp, 0, sizeof (struct rusage));
70 memset((void *)&info, 0, sizeof (siginfo_t));
71 if (times(&before_tms) == -1)
72 return (-1); /* errno is set by times() */
73
74 /*
75 * BSD's wait3() only supports WNOHANG & WUNTRACED
76 */
77 options |= (WNOHANG|WUNTRACED|WEXITED|WSTOPPED|WTRAPPED|WCONTINUED);
78 error = waitid(P_ALL, 0, &info, options);
79 if (error == 0) {
80 clock_t diffu; /* difference in usertime (ticks) */
81 clock_t diffs; /* difference in systemtime (ticks) */
82
83 if ((options & WNOHANG) && (info.si_pid == 0))
84 return (0); /* no child found */
85
86 if (rp) {
87 if (times(&after_tms) == -1)
88 return (-1); /* errno set by times() */
89 /*
90 * The system/user time is an approximation only !!!
91 */
92 diffu = after_tms.tms_cutime - before_tms.tms_cutime;
93 diffs = after_tms.tms_cstime - before_tms.tms_cstime;
94 rp->ru_utime.tv_sec = diffu/HZ;
95 rp->ru_utime.tv_usec = ((diffu % HZ) * 1000000) / HZ;
96 rp->ru_stime.tv_sec = diffs/HZ;
97 rp->ru_stime.tv_usec = ((diffs % HZ) * 1000000) / HZ;
98 }
99 *status = wstat(info.si_code, info.si_status);
100 return (info.si_pid);
101
102 } else {
103 return (-1); /* error number is set by waitid() */
104 }
105 }
106
107 /*
108 * Convert the status code to old style wait status
109 */
110 static int
111 wstat(int code, int status)
112 {
113 int stat = (status & 0377);
114
115 switch (code) {
116 case CLD_EXITED:
117 stat <<= 8;
118 break;
119 case CLD_DUMPED:
120 stat |= WCOREFLG;
121 break;
122 case CLD_KILLED:
123 break;
124 case CLD_TRAPPED:
125 case CLD_STOPPED:
126 stat <<= 8;
127 stat |= WSTOPFLG;
128 break;
129 case CLD_CONTINUED:
130 stat = WCONTFLG;
131 break;
132 }
133 return (stat);
134 }
135
136 pid_t
137 csh_wait_noreap(void)
138 {
139 siginfo_t info;
140
141 if (waitid(P_ALL, 0, &info,
142 WEXITED | WTRAPPED | WSTOPPED | WCONTINUED | WNOWAIT) != 0)
143 return (-1);
144 return (info.si_pid);
145 }