usr.bin/gcore/gcore.c

   1 /*-
   2  * Copyright (c) 1992, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #ifndef lint
  35 static const char copyright[] =
  36 "@(#) Copyright (c) 1992, 1993\n\
  37         The Regents of the University of California.  All rights reserved.\n";
  38 #endif /* not lint */
  39
  40 #if 0
  41 #ifndef lint
  42 static char sccsid[] = "@(#)gcore.c     8.2 (Berkeley) 9/23/93";
  43 #endif /* not lint */
  44 #endif
  45 #include <sys/cdefs.h>
  46 __FBSDID("$FreeBSD$");
  47
  48 /*
  49  * Originally written by Eric Cooper in Fall 1981.
  50  * Inspired by a version 6 program by Len Levin, 1978.
  51  * Several pieces of code lifted from Bill Joy's 4BSD ps.
  52  * Most recently, hacked beyond recognition for 4.4BSD by Steven McCanne,
  53  * Lawrence Berkeley Laboratory.
  54  *
  55  * Portions of this software were developed by the Computer Systems
  56  * Engineering group at Lawrence Berkeley Laboratory under DARPA
  57  * contract BG 91-66 and contributed to Berkeley.
  58  */
  59
  60 #include <sys/param.h>
  61 #include <sys/time.h>
  62 #include <sys/stat.h>
  63 #include <sys/linker_set.h>
  64
  65 #include <err.h>
  66 #include <fcntl.h>
  67 #include <signal.h>
  68 #include <stdio.h>
  69 #include <stdlib.h>
  70 #include <string.h>
  71 #include <unistd.h>
  72
  73 #include "extern.h"
  74
  75 static void     killed(int);
  76 static void     restart_target(void);
  77 static void     usage(void) __dead2;
  78
  79 static pid_t pid;
  80
  81 SET_DECLARE(dumpset, struct dumpers);
  82
  83 int
  84 main(int argc, char *argv[])
  85 {
  86         int ch, efd, fd, sflag;
  87         char *binfile, *corefile;
  88         char fname[MAXPATHLEN];
  89         struct dumpers **d, *dumper;
  90
  91         sflag = 0;
  92         corefile = NULL;
  93         while ((ch = getopt(argc, argv, "c:s")) != -1) {
  94                 switch (ch) {
  95                 case 'c':
  96                         corefile = optarg;
  97                         break;
  98                 case 's':
  99                         sflag = 1;
 100                         break;
 101                 default:
 102                         usage();
 103                         break;
 104                 }
 105         }
 106         argv += optind;
 107         argc -= optind;
 108         /* XXX we should check that the pid argument is really a number */
 109         switch (argc) {
 110         case 1:
 111                 pid = atoi(argv[0]);
 112                 asprintf(&binfile, "/proc/%d/file", pid);
 113                 if (binfile == NULL)
 114                         errx(1, "allocation failure");
 115                 break;
 116         case 2:
 117                 pid = atoi(argv[1]);
 118                 binfile = argv[0];
 119                 break;
 120         default:
 121                 usage();
 122         }
 123         efd = open(binfile, O_RDONLY, 0);
 124         if (efd < 0)
 125                 err(1, "%s", binfile);
 126         dumper = NULL;
 127         SET_FOREACH(d, dumpset) {
 128                 lseek(efd, 0, SEEK_SET);
 129                 if (((*d)->ident)(efd, pid, binfile)) {
 130                         dumper = (*d);
 131                         lseek(efd, 0, SEEK_SET);
 132                         break;
 133                 }
 134         }
 135         if (dumper == NULL)
 136                 errx(1, "Invalid executable file");
 137         if (corefile == NULL) {
 138                 (void)snprintf(fname, sizeof(fname), "core.%d", pid);
 139                 corefile = fname;
 140         }
 141         fd = open(corefile, O_RDWR|O_CREAT|O_TRUNC, DEFFILEMODE);
 142         if (fd < 0)
 143                 err(1, "%s", corefile);
 144         if (sflag) {
 145                 signal(SIGHUP, killed);
 146                 signal(SIGINT, killed);
 147                 signal(SIGTERM, killed);
 148                 if (kill(pid, SIGSTOP) == -1)
 149                         err(1, "%d: stop signal", pid);
 150                 atexit(restart_target);
 151         }
 152         dumper->dump(efd, fd, pid);
 153         (void)close(fd);
 154         (void)close(efd);
 155         exit(0);
 156 }
 157
 158 static void
 159 killed(int sig)
 160 {
 161
 162         restart_target();
 163         signal(sig, SIG_DFL);
 164         kill(getpid(), sig);
 165 }
 166
 167 static void
 168 restart_target(void)
 169 {
 170
 171         kill(pid, SIGCONT);
 172 }
 173
 174 void
 175 usage(void)
 176 {
 177
 178         (void)fprintf(stderr, "usage: gcore [-s] [-c core] [executable] pid\n");
 179         exit(1);
 180 }