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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.
* 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[] =
"@(#) Copyright (c) 1992, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#if 0
#ifndef lint
static char sccsid[] = "@(#)gcore.c 8.2 (Berkeley) 9/23/93";
#endif /* not lint */
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* 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.
*/
#include <sys/param.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/linker_set.h>
#include <sys/sysctl.h>
#include <err.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "extern.h"
int pflags;
static void killed(int);
static void usage(void) __dead2;
static pid_t pid;
SET_DECLARE(dumpset, struct dumpers);
int
main(int argc, char *argv[])
{
int ch, efd, fd, name[4];
char *binfile, *corefile;
char passpath[MAXPATHLEN], fname[MAXPATHLEN];
struct dumpers **d, *dumper;
size_t len;
pflags = 0;
corefile = NULL;
while ((ch = getopt(argc, argv, "c:fs")) != -1) {
switch (ch) {
case 'c':
corefile = optarg;
break;
case 'f':
pflags |= PFLAGS_FULL;
break;
case 's':
pflags |= PFLAGS_RESUME;
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]);
name[0] = CTL_KERN;
name[1] = KERN_PROC;
name[2] = KERN_PROC_PATHNAME;
name[3] = pid;
len = sizeof(passpath);
if (sysctl(name, 4, passpath, &len, NULL, 0) == -1)
errx(1, "kern.proc.pathname failure");
binfile = passpath;
break;
case 2:
pid = atoi(argv[1]);
binfile = argv[0];
break;
default:
usage();
}
efd = open(binfile, O_RDONLY, 0);
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");
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);
/*
* The semantics of the 's' flag is to stop the target process.
* Previous versions of gcore would manage this by trapping SIGHUP,
* SIGINT and SIGTERM (to be passed to the target pid), and then
* signal the child to stop.
*
* However, this messes up if the selected dumper uses ptrace calls
* that leave the child already stopped. The waitpid call in elfcore
* never returns.
*
* The best thing to do here is to externalize the 's' flag and let
* each dumper dispose of what that means, if anything. For the elfcore
* dumper, the 's' flag is a no-op since the ptrace attach stops the
* process in question already.
*/
dumper->dump(efd, fd, pid);
(void)close(fd);
(void)close(efd);
exit(0);
}
void
usage(void)
{
(void)fprintf(stderr, "usage: gcore [-s] [-c core] [executable] pid\n");
exit(1);
}
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