usr.bin/gcore/gcore.c

   1 /*      $NetBSD: gcore.c,v 1.10 2007/12/15 19:44:50 perry Exp $ */
   2
   3 /*-
   4  * Copyright (c) 2003 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Christos Zoulas.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 __RCSID("$NetBSD: gcore.c,v 1.10 2007/12/15 19:44:50 perry Exp $");
  34
  35 #include <sys/types.h>
  36 #include <sys/param.h>
  37 #include <sys/time.h>
  38 #include <sys/ptrace.h>
  39 #include <sys/proc.h>
  40 #include <sys/wait.h>
  41
  42 #include <stdio.h>
  43 #include <string.h>
  44 #include <err.h>
  45 #include <limits.h>
  46 #include <stdlib.h>
  47 #include <unistd.h>
  48 #include <errno.h>
  49
  50 static void usage(void) __dead;
  51
  52 static void
  53 usage(void)
  54 {
  55         (void)fprintf(stderr, "Usage: %s [-c <corename>] <pid> [<pid> ...]\n",
  56             getprogname());
  57         exit(1);
  58 }
  59
  60
  61 int
  62 main(int argc, char **argv)
  63 {
  64         int c;
  65         char *corename = NULL;
  66         int corelen = 0;
  67
  68         while ((c = getopt(argc, argv, "c:")) != -1)
  69                 switch (c) {
  70                 case 'c':
  71                         corename = optarg;
  72                         corelen = strlen(corename);
  73                         break;
  74                 case '?':
  75                 default:
  76                         usage();
  77                         /*NOTREACHED*/
  78                 }
  79
  80         if (optind == argc)
  81                 usage();
  82
  83         for (c = optind; c < argc; c++) {
  84                 char *ep;
  85                 u_long lval;
  86                 int status, serrno;
  87                 pid_t pid, cpid;
  88
  89                 errno = 0;
  90                 lval = strtoul(argv[c], &ep, 0);
  91                 if (argv[c] == '\0' || *ep)
  92                         errx(1, "`%s' is not a number.", argv[c]);
  93
  94                 if (errno == ERANGE && lval == ULONG_MAX)
  95                         err(1, "Pid `%s'", argv[c]);
  96
  97                 pid = (pid_t)lval;
  98
  99                 if (ptrace(PT_ATTACH, pid, 0, 0) == -1)
 100                         err(1, "ptrace(PT_ATTACH) to %lu failed", lval);
 101
 102                 if ((cpid = waitpid(pid, &status, 0)) != pid) {
 103                         serrno = errno;
 104                         (void)ptrace(PT_DETACH, pid, (void *)1, 0);
 105                         errno = serrno;
 106                         if (cpid == -1)
 107                                 err(1, "Cannot wait for %lu", lval);
 108                         else
 109                                 errx(1, "Unexpected process %lu waited",
 110                                     (unsigned long)cpid);
 111                 }
 112
 113                 if (ptrace(PT_DUMPCORE, pid, corename, corelen) == -1) {
 114                         serrno = errno;
 115                         (void)ptrace(PT_DETACH, pid, (void *)1, 0);
 116                         errno = serrno;
 117                         err(1, "ptrace(PT_DUMPCORE) to %lu failed", lval);
 118                 }
 119                 if (ptrace(PT_DETACH, pid, (void *)1, 0) == -1)
 120                         err(1, "ptrace(PT_DETACH) to %lu failed", lval);
 121         }
 122         return 0;
 123 }