Add pwait utility, which waits for any process to terminate.
This is similar to the Solaris utility of the same name. Some use cases: * rc.subr's wait_for_pids * interactive use, e.g. to shut down the computer when some task is done even if the task is already running Discussed on: hackers@
This commit is contained in:
Jilles Tjoelker
parent
3ea6157e6b
commit
0e5e416780
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=199458
@ -27,6 +27,7 @@ SUBDIR= cat \
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pax \
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pkill \
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ps \
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pwait \
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pwd \
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${_rcp} \
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realpath \
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5
bin/pwait/Makefile
Normal file
5
bin/pwait/Makefile
Normal file
@ -0,0 +1,5 @@
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# $FreeBSD$
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PROG= pwait
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.include <bsd.prog.mk>
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78
bin/pwait/pwait.1
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78
bin/pwait/pwait.1
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@ -0,0 +1,78 @@
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.\"
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.\" Copyright (c) 2004-2009, Jilles Tjoelker
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with
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.\" or without modification, are permitted provided that the
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.\" following conditions are met:
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.\"
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.\" 1. Redistributions of source code must retain the above
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.\" copyright notice, this list of conditions and the
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.\" following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the
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.\" above copyright notice, this list of conditions and
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.\" the following disclaimer in the documentation and/or
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.\" other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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.\" CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
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.\" WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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.\" PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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.\" COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY
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.\" DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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.\" PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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.\" USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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.\" CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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.\" NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
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.\" USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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.\" OF SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd November 1, 2009
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.Os
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.Dt PWAIT 1
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.Sh NAME
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.Nm pwait
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.Nd wait for processes to terminate
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.Sh SYNOPSIS
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.Nm
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.Op Fl v
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.Ar pid
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\&...
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.Sh DESCRIPTION
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The
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.Nm
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utility will wait until each of the given processes has terminated.
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.Pp
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The following option is available:
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.Bl -tag -width indent
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.It Fl v
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Print the exit status when each process terminates.
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.El
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.Sh DIAGNOSTICS
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.Pp
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The
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.Nm
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utility returns 0 on success, and >0 if an error occurs.
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.Pp
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Invalid pids elicit a warning message but are otherwise ignored.
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.Sh SEE ALSO
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.Xr kill 1 ,
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.Xr pkill 1 ,
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.Xr ps 1 ,
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.Xr wait 1 ,
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.Xr kqueue 2
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.Sh NOTES
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.Nm
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is not a substitute for the
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.Xr wait 1
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builtin
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as it will not clean up any zombies or state in the parent process.
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.Sh HISTORY
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A
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.Nm
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command first appeared in SunOS 5.8.
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145
bin/pwait/pwait.c
Normal file
145
bin/pwait/pwait.c
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@ -0,0 +1,145 @@
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/*-
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* Copyright (c) 2004-2009, Jilles Tjoelker
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with
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* or without modification, are permitted provided that the
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* following conditions are met:
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*
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* 1. Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the
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* following disclaimer.
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* 2. Redistributions in binary form must reproduce the
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* above copyright notice, this list of conditions and
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* the following disclaimer in the documentation and/or
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* other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
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* USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/event.h>
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#include <sys/time.h>
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#include <sys/wait.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sysexits.h>
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#include <unistd.h>
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static void
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usage(void)
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{
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fprintf(stderr, "usage: pwait [-v] pid ...\n");
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exit(EX_USAGE);
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}
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/*
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* pwait - wait for processes to terminate
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*/
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int
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main(int argc, char *argv[])
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{
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int kq;
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struct kevent *e;
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int verbose = 0;
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int opt, nleft, n, i, duplicate, status;
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long pid;
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char *s, *end;
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while ((opt = getopt(argc, argv, "v")) != -1) {
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switch (opt) {
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case 'v':
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verbose = 1;
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break;
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default:
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usage();
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/* NOTREACHED */
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}
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}
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argc -= optind;
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argv += optind;
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if (argc == 0)
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usage();
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kq = kqueue();
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if (kq == -1)
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err(1, "kqueue");
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e = malloc(argc * sizeof(struct kevent));
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if (e == NULL)
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err(1, "malloc");
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nleft = 0;
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for (n = 0; n < argc; n++) {
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s = argv[n];
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if (!strncmp(s, "/proc/", 6)) /* Undocumented Solaris compat */
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s += 6;
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errno = 0;
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pid = strtol(s, &end, 10);
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if (pid < 0 || *end != '\0' || errno != 0) {
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warnx("%s: bad process id", s);
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continue;
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}
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duplicate = 0;
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for (i = 0; i < nleft; i++)
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if (e[i].ident == (uintptr_t)pid)
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duplicate = 1;
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if (!duplicate) {
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EV_SET(e + nleft, pid, EVFILT_PROC, EV_ADD, NOTE_EXIT,
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0, NULL);
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if (kevent(kq, e + nleft, 1, NULL, 0, NULL) == -1)
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warn("%ld", pid);
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else
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nleft++;
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}
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}
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while (nleft > 0) {
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n = kevent(kq, NULL, 0, e, nleft, NULL);
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if (n == -1)
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err(1, "kevent");
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if (verbose)
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for (i = 0; i < n; i++) {
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status = e[i].data;
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if (WIFEXITED(status))
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printf("%ld: exited with status %d.\n",
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(long)e[i].ident,
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WEXITSTATUS(status));
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else if (WIFSIGNALED(status))
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printf("%ld: killed by signal %d.\n",
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(long)e[i].ident,
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WTERMSIG(status));
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else
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printf("%ld: terminated.\n",
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(long)e[i].ident);
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}
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nleft -= n;
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}
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return 0;
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}
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