1/* vi: set sw=4 ts=4: */
2/* uname -- print system information
3 * Copyright (C) 1989-1999 Free Software Foundation, Inc.
4 *
5 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
6 */
7
8/* BB_AUDIT SUSv3 compliant */
9/* http://www.opengroup.org/onlinepubs/007904975/utilities/uname.html */
10
11/* Option		Example
12
13   -s, --sysname	SunOS
14   -n, --nodename	rocky8
15   -r, --release	4.0
16   -v, --version
17   -m, --machine	sun
18   -a, --all		SunOS rocky8 4.0  sun
19
20   The default behavior is equivalent to `-s'.
21
22   David MacKenzie <djm@gnu.ai.mit.edu> */
23
24/* Busyboxed by Erik Andersen */
25
26/* Further size reductions by Glenn McGrath and Manuel Novoa III. */
27
28/* Mar 16, 2003      Manuel Novoa III   (mjn3@codepoet.org)
29 *
30 * Now does proper error checking on i/o.  Plus some further space savings.
31 */
32
33#include <sys/utsname.h>
34#include "libbb.h"
35
36typedef struct {
37	struct utsname name;
38	char processor[8];			/* for "unknown" */
39} uname_info_t;
40
41static const char options[] ALIGN1 = "snrvmpa";
42static const unsigned short utsname_offset[] ALIGN2 = {
43	offsetof(uname_info_t,name.sysname),
44	offsetof(uname_info_t,name.nodename),
45	offsetof(uname_info_t,name.release),
46	offsetof(uname_info_t,name.version),
47	offsetof(uname_info_t,name.machine),
48	offsetof(uname_info_t,processor)
49};
50
51int uname_main(int argc, char **argv);
52int uname_main(int argc, char **argv)
53{
54	uname_info_t uname_info;
55#if defined(__sparc__) && defined(__linux__)
56	char *fake_sparc = getenv("FAKE_SPARC");
57#endif
58	const unsigned short int *delta;
59	char toprint;
60
61	toprint = getopt32(argv, options);
62
63	if (argc != optind) {
64		bb_show_usage();
65	}
66
67	if (toprint & (1 << 6)) {
68		toprint = 0x3f;
69	}
70
71	if (toprint == 0) {
72		toprint = 1;			/* sysname */
73	}
74
75	if (uname(&uname_info.name) == -1) {
76		bb_error_msg_and_die("cannot get system name");
77	}
78
79#if defined(__sparc__) && defined(__linux__)
80	if ((fake_sparc != NULL)
81		&& ((fake_sparc[0] == 'y')
82			|| (fake_sparc[0] == 'Y'))) {
83		strcpy(uname_info.name.machine, "sparc");
84	}
85#endif
86
87	strcpy(uname_info.processor, "unknown");
88
89	delta = utsname_offset;
90	do {
91		if (toprint & 1) {
92			printf(((char *)(&uname_info)) + *delta);
93			if (toprint > 1) {
94				putchar(' ');
95			}
96		}
97		++delta;
98	} while (toprint >>= 1);
99	putchar('\n');
100
101	fflush_stdout_and_exit(EXIT_SUCCESS);
102}
103