uname.c revision 203042 
1/*-
2 * Copyright (c) 2002 Juli Mallett.
3 * Copyright (c) 1993
4 *	The Regents of the University of California.  All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. All advertising materials mentioning features or use of this software
15 *    must display the following acknowledgement:
16 *	This product includes software developed by the University of
17 *	California, Berkeley and its contributors.
18 * 4. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include <sys/cdefs.h>
36
37__FBSDID("$FreeBSD: head/usr.bin/uname/uname.c 203042 2010-01-26 20:02:53Z emaste $");
38
39#ifndef lint
40static const char copyright[] =
41"@(#) Copyright (c) 1993\n\
42	The Regents of the University of California.  All rights reserved.\n";
43#endif
44
45#ifndef lint
46static const char sccsid[] = "@(#)uname.c	8.2 (Berkeley) 5/4/95";
47#endif
48
49#include <sys/param.h>
50#include <sys/sysctl.h>
51
52#include <err.h>
53#include <stdio.h>
54#include <stdlib.h>
55#include <unistd.h>
56
57#define	MFLAG	0x01
58#define	NFLAG	0x02
59#define	PFLAG	0x04
60#define	RFLAG	0x08
61#define	SFLAG	0x10
62#define	VFLAG	0x20
63#define	IFLAG	0x40
64
65typedef void (*get_t)(void);
66get_t get_ident, get_platform, get_hostname, get_arch, get_release, get_sysname, get_version;
67
68void native_ident(void);
69void native_platform(void);
70void native_hostname(void);
71void native_arch(void);
72void native_release(void);
73void native_sysname(void);
74void native_version(void);
75void print_uname(u_int);
76void setup_get(void);
77void usage(void);
78
79char *ident, *platform, *hostname, *arch, *release, *sysname, *version;
80int space;
81
82int
83main(int argc, char *argv[])
84{
85	u_int flags;
86	int ch;
87
88	setup_get();
89	flags = 0;
90
91	while ((ch = getopt(argc, argv, "aimnoprsv")) != -1)
92		switch(ch) {
93		case 'a':
94			flags |= (MFLAG | NFLAG | RFLAG | SFLAG | VFLAG);
95			break;
96		case 'i':
97			flags |= IFLAG;
98			break;
99		case 'm':
100			flags |= MFLAG;
101			break;
102		case 'n':
103			flags |= NFLAG;
104			break;
105		case 'p':
106			flags |= PFLAG;
107			break;
108		case 'r':
109			flags |= RFLAG;
110			break;
111		case 's':
112		case 'o':
113			flags |= SFLAG;
114			break;
115		case 'v':
116			flags |= VFLAG;
117			break;
118		case '?':
119		default:
120			usage();
121		}
122
123	argc -= optind;
124	argv += optind;
125
126	if (argc)
127		usage();
128
129	if (!flags)
130		flags |= SFLAG;
131
132	print_uname(flags);
133	exit(0);
134}
135
136#define	CHECK_ENV(opt,var)				\
137do {							\
138	if ((var = getenv("UNAME_" opt)) == NULL) {	\
139		get_##var = native_##var;		\
140	} else {					\
141		get_##var = (get_t)NULL;		\
142	}						\
143} while (0)
144
145void
146setup_get(void)
147{
148	CHECK_ENV("s", sysname);
149	CHECK_ENV("n", hostname);
150	CHECK_ENV("r", release);
151	CHECK_ENV("v", version);
152	CHECK_ENV("m", platform);
153	CHECK_ENV("p", arch);
154	CHECK_ENV("i", ident);
155}
156
157#define	PRINT_FLAG(flags,flag,var)		\
158	if ((flags & flag) == flag) {		\
159		if (space)			\
160			printf(" ");		\
161		else				\
162			space++;		\
163		if (get_##var != NULL)		\
164			(*get_##var)();		\
165		printf("%s", var);		\
166	}
167
168void
169print_uname(u_int flags)
170{
171	PRINT_FLAG(flags, SFLAG, sysname);
172	PRINT_FLAG(flags, NFLAG, hostname);
173	PRINT_FLAG(flags, RFLAG, release);
174	PRINT_FLAG(flags, VFLAG, version);
175	PRINT_FLAG(flags, MFLAG, platform);
176	PRINT_FLAG(flags, PFLAG, arch);
177	PRINT_FLAG(flags, IFLAG, ident);
178	printf("\n");
179}
180
181#define	NATIVE_SYSCTL2_GET(var,mib0,mib1)	\
182void						\
183native_##var(void)				\
184{						\
185	int mib[] = { (mib0), (mib1) };		\
186	size_t len;				\
187	static char buf[1024];			\
188	char **varp = &(var);			\
189						\
190	len = sizeof buf;			\
191	if (sysctl(mib, sizeof mib / sizeof mib[0],	\
192	   &buf, &len, NULL, 0) == -1)		\
193		err(1, "sysctl");
194
195#define	NATIVE_SYSCTLNAME_GET(var,name)		\
196void						\
197native_##var(void)				\
198{						\
199	size_t len;				\
200	static char buf[1024];			\
201	char **varp = &(var);			\
202						\
203	len = sizeof buf;			\
204	if (sysctlbyname(name, &buf, &len, NULL,\
205	    0) == -1)				\
206		err(1, "sysctlbyname");
207
208#define	NATIVE_SET				\
209	*varp = buf;				\
210	return;					\
211}	struct __hack
212
213#define	NATIVE_BUFFER	(buf)
214#define	NATIVE_LENGTH	(len)
215
216NATIVE_SYSCTL2_GET(sysname, CTL_KERN, KERN_OSTYPE) {
217} NATIVE_SET;
218
219NATIVE_SYSCTL2_GET(hostname, CTL_KERN, KERN_HOSTNAME) {
220} NATIVE_SET;
221
222NATIVE_SYSCTL2_GET(release, CTL_KERN, KERN_OSRELEASE) {
223} NATIVE_SET;
224
225NATIVE_SYSCTL2_GET(version, CTL_KERN, KERN_VERSION) {
226	size_t n;
227	char *p;
228
229	p = NATIVE_BUFFER;
230	n = NATIVE_LENGTH;
231	for (; n--; ++p)
232		if (*p == '\n' || *p == '\t')
233			*p = ' ';
234} NATIVE_SET;
235
236NATIVE_SYSCTL2_GET(platform, CTL_HW, HW_MACHINE) {
237} NATIVE_SET;
238
239NATIVE_SYSCTL2_GET(arch, CTL_HW, HW_MACHINE_ARCH) {
240} NATIVE_SET;
241
242NATIVE_SYSCTLNAME_GET(ident, "kern.ident") {
243} NATIVE_SET;
244
245void
246usage(void)
247{
248	fprintf(stderr, "usage: uname [-aimnprsv]\n");
249	exit(1);
250}
251