text: /*-
   * 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[] =
  "@(#) 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: src/usr.bin/gcore/gcore.c,v 1.31 2004/02/15 22:48:25 dwmalone Exp $");
  
  /*
   * 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 <err.h>
  #include <fcntl.h>
  #include <signal.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <unistd.h>
  
  #include "extern.h"
  
  static void	killed(int);
  static void	restart_target(void);
  static void	usage(void) __dead2;
  
  static pid_t pid;
  
  SET_DECLARE(dumpset, struct dumpers);
  
  int
  main(int argc, char *argv[])
  {
  	int ch, efd, fd, sflag;
  	char *binfile, *corefile;
  	char fname[MAXPATHLEN];
  	struct dumpers **d, *dumper;
  
  	sflag = 0;
  	corefile = NULL;
          while ((ch = getopt(argc, argv, "c:s")) != -1) {
                  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:
  		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);
  	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);
  	(void)close(fd);
  	(void)close(efd);
  	exit(0);
  }
  
  static void
  killed(int sig)
  {
  
  	restart_target();
  	signal(sig, SIG_DFL);
  	kill(getpid(), sig);
  }
  
  static void
  restart_target(void)
  {
  
  	kill(pid, SIGCONT);
  }
  
  void
  usage(void)
  {
  
  	(void)fprintf(stderr, "usage: gcore [-s] [-c core] [executable] pid\n");
  	exit(1);
  }
  