ldd.c revision 21673 
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 *	$FreeBSD: head/usr.bin/ldd/ldd.c 21673 1997-01-14 07:20:47Z jkh $
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
47extern void	dump_filename __P((const char *));
48extern int	error_count;
49
50void
51usage()
52{
53	fprintf(stderr, "usage: ldd [-v] [-f format] program ...\n");
54	exit(1);
55}
56
57int
58main(argc, argv)
59int	argc;
60char	*argv[];
61{
62	char		*fmt1 = NULL, *fmt2 = NULL;
63	int		rval;
64	int		c;
65	int		vflag = 0;
66
67	while ((c = getopt(argc, argv, "vf:")) != EOF) {
68		switch (c) {
69		case 'v':
70			vflag++;
71			break;
72		case 'f':
73			if (fmt1) {
74				if (fmt2)
75					errx(1, "Too many formats");
76				fmt2 = optarg;
77			} else
78				fmt1 = optarg;
79			break;
80		default:
81			usage();
82			/*NOTREACHED*/
83		}
84	}
85	argc -= optind;
86	argv += optind;
87
88	if (vflag && fmt1)
89		errx(1, "-v may not be used with -f");
90
91	if (argc <= 0) {
92		usage();
93		/*NOTREACHED*/
94	}
95
96	if (vflag) {
97		for (c = 0; c < argc; c++)
98			dump_file(argv[c]);
99		exit(error_count == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
100	}
101
102	/* ld.so magic */
103	setenv("LD_TRACE_LOADED_OBJECTS", "1", 1);
104	if (fmt1)
105		setenv("LD_TRACE_LOADED_OBJECTS_FMT1", fmt1, 1);
106	if (fmt2)
107		setenv("LD_TRACE_LOADED_OBJECTS_FMT2", fmt2, 1);
108
109	rval = 0;
110	while (argc--) {
111		int	fd;
112		struct exec hdr;
113		int	status;
114
115		if ((fd = open(*argv, O_RDONLY, 0)) < 0) {
116			warn("%s", *argv);
117			rval |= 1;
118			argv++;
119			continue;
120		}
121		if (read(fd, &hdr, sizeof hdr) != sizeof hdr
122		    || (N_GETFLAG(hdr) & EX_DPMASK) != EX_DYNAMIC
123#if 1 /* Compatibility */
124		    || hdr.a_entry < __LDPGSZ
125#endif
126		    ) {
127
128			warnx("%s: not a dynamic executable", *argv);
129			(void)close(fd);
130			rval |= 1;
131			argv++;
132			continue;
133		}
134		(void)close(fd);
135
136		setenv("LD_TRACE_LOADED_OBJECTS_PROGNAME", *argv, 1);
137		if (fmt1 == NULL && fmt2 == NULL)
138			/* Default formats */
139			printf("%s:\n", *argv);
140
141		fflush(stdout);
142
143		switch (fork()) {
144		case -1:
145			err(1, "fork");
146			break;
147		default:
148			if (wait(&status) <= 0) {
149				warn("wait");
150				rval |= 1;
151			} else if (WIFSIGNALED(status)) {
152				fprintf(stderr, "%s: signal %d\n",
153						*argv, WTERMSIG(status));
154				rval |= 1;
155			} else if (WIFEXITED(status) && WEXITSTATUS(status)) {
156				fprintf(stderr, "%s: exit status %d\n",
157						*argv, WEXITSTATUS(status));
158				rval |= 1;
159			}
160			break;
161		case 0:
162			rval |= execl(*argv, *argv, NULL) != 0;
163			perror(*argv);
164			_exit(1);
165		}
166		argv++;
167	}
168
169	return rval;
170}
171