usr.bin/uname/uname.c

   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  * @(#) Copyright (c) 1993 The Regents of the University of California.  All rights reserved.
  35  * @(#)uname.c  8.2 (Berkeley) 5/4/95
  36  * $FreeBSD: src/usr.bin/uname/uname.c,v 1.4.6.2 2002/10/17 07:47:29 jmallett Exp $
  37  * $DragonFly: src/usr.bin/uname/uname.c,v 1.6 2007/01/19 07:23:43 dillon Exp $
  38  */
  39
  40 #include <sys/param.h>
  41 #include <sys/sysctl.h>
  42
  43 #include <err.h>
  44 #include <stdio.h>
  45 #include <stdlib.h>
  46 #include <unistd.h>
  47
  48 #define MFLAG   0x01
  49 #define NFLAG   0x02
  50 #define PFLAG   0x04
  51 #define RFLAG   0x08
  52 #define SFLAG   0x10
  53 #define VFLAG   0x20
  54 #define IFLAG   0x40
  55
  56 typedef void (*get_t)(void);
  57 get_t get_ident, get_machine, get_hostname, get_arch, get_release, get_sysname, get_version;
  58
  59 void native_ident(void);
  60 void native_machine(void);
  61 void native_hostname(void);
  62 void native_arch(void);
  63 void native_release(void);
  64 void native_sysname(void);
  65 void native_version(void);
  66 void print_uname(u_int);
  67 void setup_get(void);
  68 void usage(void);
  69
  70 char *ident, *machine, *hostname, *arch, *release, *sysname, *version;
  71 int space;
  72
  73 int
  74 main(int argc, char *argv[])
  75 {
  76         u_int flags;
  77         int ch;
  78
  79         setup_get();
  80         flags = 0;
  81
  82         while ((ch = getopt(argc, argv, "aimnprsv")) != -1)
  83                 switch(ch) {
  84                 case 'a':
  85                         flags |= (MFLAG | NFLAG | RFLAG | SFLAG | VFLAG);
  86                         break;
  87                 case 'i':
  88                         flags |= IFLAG;
  89                         break;
  90                 case 'm':
  91                         flags |= MFLAG;
  92                         break;
  93                 case 'n':
  94                         flags |= NFLAG;
  95                         break;
  96                 case 'p':
  97                         flags |= PFLAG;
  98                         break;
  99                 case 'r':
 100                         flags |= RFLAG;
 101                         break;
 102                 case 's':
 103                         flags |= SFLAG;
 104                         break;
 105                 case 'v':
 106                         flags |= VFLAG;
 107                         break;
 108                 case '?':
 109                 default:
 110                         usage();
 111                 }
 112
 113         argc -= optind;
 114         argv += optind;
 115
 116         if (argc)
 117                 usage();
 118
 119         if (!flags)
 120                 flags |= SFLAG;
 121
 122         print_uname(flags);
 123         exit(0);
 124 }
 125
 126 #define CHECK_ENV(opt,var)                              \
 127 do {                                                    \
 128         if ((var = getenv("UNAME_" opt)) == NULL) {     \
 129                 get_##var = native_##var;               \
 130         } else {                                        \
 131                 get_##var = (get_t)NULL;                \
 132         }                                               \
 133 } while (0)
 134
 135 void
 136 setup_get(void)
 137 {
 138         CHECK_ENV("s", sysname);
 139         CHECK_ENV("n", hostname);
 140         CHECK_ENV("r", release);
 141         CHECK_ENV("v", version);
 142         CHECK_ENV("m", machine);
 143         CHECK_ENV("p", arch);
 144         CHECK_ENV("i", ident);
 145 }
 146
 147 #define PRINT_FLAG(flags,flag,var)              \
 148         if ((flags & flag) == flag) {           \
 149                 if (space)                      \
 150                         printf(" ");            \
 151                 else                            \
 152                         space++;                \
 153                 if (get_##var != NULL)          \
 154                         (*get_##var)();         \
 155                 printf("%s", var);              \
 156         }
 157
 158 void
 159 print_uname(u_int flags)
 160 {
 161         PRINT_FLAG(flags, SFLAG, sysname);
 162         PRINT_FLAG(flags, NFLAG, hostname);
 163         PRINT_FLAG(flags, RFLAG, release);
 164         PRINT_FLAG(flags, VFLAG, version);
 165         PRINT_FLAG(flags, MFLAG, machine);
 166         PRINT_FLAG(flags, PFLAG, arch);
 167         PRINT_FLAG(flags, IFLAG, ident);
 168         printf("\n");
 169 }
 170
 171 #define NATIVE_SYSCTL2_GET(var,mib0,mib1)       \
 172 void                                            \
 173 native_##var(void)                              \
 174 {                                               \
 175         int mib[] = { (mib0), (mib1) };         \
 176         size_t len;                             \
 177         static char buf[1024];                  \
 178         char **varp = &(var);                   \
 179                                                 \
 180         len = sizeof buf;                       \
 181         if (sysctl(mib, sizeof mib / sizeof mib[0],     \
 182            &buf, &len, NULL, 0) == -1)          \
 183                 err(1, "sysctl");
 184
 185 #define NATIVE_SYSCTLNAME_GET(var,name)         \
 186 void                                            \
 187 native_##var(void)                              \
 188 {                                               \
 189         size_t len;                             \
 190         static char buf[1024];                  \
 191         char **varp = &(var);                   \
 192                                                 \
 193         len = sizeof buf;                       \
 194         if (sysctlbyname(name, &buf, &len, NULL,\
 195             0) == -1)                           \
 196                 err(1, "sysctlbyname");
 197
 198 #define NATIVE_SET                              \
 199         *varp = buf;                            \
 200         return;                                 \
 201 }       struct __hack
 202
 203 #define NATIVE_BUFFER   (buf)
 204 #define NATIVE_LENGTH   (len)
 205
 206 NATIVE_SYSCTL2_GET(sysname, CTL_KERN, KERN_OSTYPE) {
 207 } NATIVE_SET;
 208
 209 NATIVE_SYSCTL2_GET(hostname, CTL_KERN, KERN_HOSTNAME) {
 210 } NATIVE_SET;
 211
 212 NATIVE_SYSCTL2_GET(release, CTL_KERN, KERN_OSRELEASE) {
 213 } NATIVE_SET;
 214
 215 NATIVE_SYSCTL2_GET(version, CTL_KERN, KERN_VERSION) {
 216         size_t n;
 217         char *p;
 218
 219         p = NATIVE_BUFFER;
 220         n = NATIVE_LENGTH;
 221         for (; n--; ++p)
 222                 if (*p == '\n' || *p == '\t')
 223                         *p = ' ';
 224 } NATIVE_SET;
 225
 226 NATIVE_SYSCTL2_GET(machine, CTL_HW, HW_MACHINE) {
 227 } NATIVE_SET;
 228
 229 NATIVE_SYSCTL2_GET(arch, CTL_HW, HW_MACHINE_ARCH) {
 230 } NATIVE_SET;
 231
 232 NATIVE_SYSCTLNAME_GET(ident, "kern.ident") {
 233 } NATIVE_SET;
 234
 235 void
 236 usage(void)
 237 {
 238         fprintf(stderr, "usage: uname [-aimnprsv]\n");
 239         exit(1);
 240 }