ldd.c revision 5205 
1/*
2 * Copyright (c) 1993 Paul Kranenburg
3 * 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 Paul Kranenburg.
16 * 4. The name of the author may not be used to endorse or promote products
17 *    derived from this software without specific prior written permission
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 *
30 *	$Id: ldd.c,v 1.4 1994/06/15 22:41:03 rich Exp $
31 */
32
33#include <sys/types.h>
34#include <sys/stat.h>
35#include <sys/file.h>
36#include <sys/time.h>
37#include <sys/resource.h>
38#include <sys/wait.h>
39#include <a.out.h>
40#include <err.h>
41#include <fcntl.h>
42#include <stdio.h>
43#include <stdlib.h>
44#include <string.h>
45#include <unistd.h>
46
47void
48usage()
49{
50	extern char *__progname;
51
52	fprintf(stderr, "Usage: %s <filename> ...\n", __progname);
53	exit(1);
54}
55
56int
57main(argc, argv)
58int	argc;
59char	*argv[];
60{
61	int		rval;
62	int		c;
63
64	while ((c = getopt(argc, argv, "")) != EOF) {
65		switch (c) {
66		default:
67			usage();
68			/*NOTREACHED*/
69		}
70	}
71	argc -= optind;
72	argv += optind;
73
74	if (argc <= 0) {
75		usage();
76		/*NOTREACHED*/
77	}
78
79	/* ld.so magic */
80	setenv("LD_TRACE_LOADED_OBJECTS", "", 1);
81
82	rval = 0;
83	while (argc--) {
84		int	fd;
85		struct exec hdr;
86		int	status;
87
88		if ((fd = open(*argv, O_RDONLY, 0)) < 0) {
89			warn("%s", *argv);
90			rval |= 1;
91			argv++;
92			continue;
93		}
94		if (read(fd, &hdr, sizeof hdr) != sizeof hdr
95		    || (N_GETFLAG(hdr) & EX_DPMASK) != EX_DYNAMIC
96#if 1 /* Compatibility */
97		    || hdr.a_entry < __LDPGSZ
98#endif
99		    ) {
100
101			warnx("%s: not a dynamic executable", *argv);
102			(void)close(fd);
103			rval |= 1;
104			argv++;
105			continue;
106		}
107		(void)close(fd);
108
109		printf("%s:\n", *argv);
110		fflush(stdout);
111
112		switch (fork()) {
113		case -1:
114			err(1, "fork");
115			break;
116		default:
117			if (wait(&status) <= 0) {
118				warn("wait");
119				rval |= 1;
120			} else if (WIFSIGNALED(status)) {
121				fprintf(stderr, "%s: signal %d\n",
122						*argv, WTERMSIG(status));
123				rval |= 1;
124			} else if (WIFEXITED(status) && WEXITSTATUS(status)) {
125				fprintf(stderr, "%s: exit status %d\n",
126						*argv, WEXITSTATUS(status));
127				rval |= 1;
128			}
129			break;
130		case 0:
131			rval |= execl(*argv, *argv, NULL) != 0;
132			perror(*argv);
133			_exit(1);
134		}
135		argv++;
136	}
137
138	return rval;
139}
140