freebsd-dev/usr.bin/gcore/gcore.c

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/*-
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static const char copyright[] =
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"@(#) Copyright (c) 1992, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#if 0
#ifndef lint
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static char sccsid[] = "@(#)gcore.c 8.2 (Berkeley) 9/23/93";
#endif /* not lint */
#endif
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#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
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/*
* Originally written by Eric Cooper in Fall 1981.
* Inspired by a version 6 program by Len Levin, 1978.
* Several pieces of code lifted from Bill Joy's 4BSD ps.
* Most recently, hacked beyond recognition for 4.4BSD by Steven McCanne,
* Lawrence Berkeley Laboratory.
*
* Portions of this software were developed by the Computer Systems
* Engineering group at Lawrence Berkeley Laboratory under DARPA
* contract BG 91-66 and contributed to Berkeley.
*/
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#include <sys/param.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/linker_set.h>
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#include <err.h>
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#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "extern.h"
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static void killed(int);
static void restart_target(void);
static void usage(void) __dead2;
static pid_t pid;
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SET_DECLARE(dumpset, struct dumpers);
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int
main(int argc, char *argv[])
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{
int ch, efd, fd, sflag;
char *binfile, *corefile;
char fname[MAXPATHLEN];
struct dumpers **d, *dumper;
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sflag = 0;
corefile = NULL;
while ((ch = getopt(argc, argv, "c:s")) != -1) {
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switch (ch) {
case 'c':
corefile = optarg;
break;
case 's':
sflag = 1;
break;
default:
usage();
break;
}
}
argv += optind;
argc -= optind;
/* XXX we should check that the pid argument is really a number */
switch (argc) {
case 1:
pid = atoi(argv[0]);
asprintf(&binfile, "/proc/%d/file", pid);
if (binfile == NULL)
errx(1, "allocation failure");
break;
case 2:
pid = atoi(argv[1]);
binfile = argv[0];
break;
default:
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usage();
}
efd = open(binfile, O_RDONLY, 0);
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if (efd < 0)
err(1, "%s", binfile);
dumper = NULL;
SET_FOREACH(d, dumpset) {
lseek(efd, 0, SEEK_SET);
if (((*d)->ident)(efd, pid, binfile)) {
dumper = (*d);
lseek(efd, 0, SEEK_SET);
break;
}
}
if (dumper == NULL)
errx(1, "Invalid executable file");
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if (corefile == NULL) {
(void)snprintf(fname, sizeof(fname), "core.%d", pid);
corefile = fname;
}
fd = open(corefile, O_RDWR|O_CREAT|O_TRUNC, DEFFILEMODE);
if (fd < 0)
err(1, "%s", corefile);
if (sflag) {
signal(SIGHUP, killed);
signal(SIGINT, killed);
signal(SIGTERM, killed);
if (kill(pid, SIGSTOP) == -1)
err(1, "%d: stop signal", pid);
atexit(restart_target);
}
dumper->dump(efd, fd, pid);
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(void)close(fd);
(void)close(efd);
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exit(0);
}
static void
killed(int sig)
{
restart_target();
signal(sig, SIG_DFL);
kill(getpid(), sig);
}
static void
restart_target(void)
{
kill(pid, SIGCONT);
}
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void
usage(void)
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{
(void)fprintf(stderr, "usage: gcore [-s] [-c core] [executable] pid\n");
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exit(1);
}