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      1 /*	$NetBSD: gcore.c,v 1.12 2019/02/01 08:29:04 mrg 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 1.12 2019/02/01 08:29:04 mrg 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] == NULL || *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 }
    124