bin/varsym/varsym.c

   1 /*
   2  * Copyright (c) 2003 Matthew Dillon <dillon@backplane.com>
   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  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $DragonFly: src/bin/varsym/varsym.c,v 1.4 2003/12/11 20:33:49 dillon Exp $
  27  */
  28
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #include <errno.h>
  33 #include <unistd.h>
  34 #include <sys/varsym.h>
  35
  36 static void dumpvars(char *buf, int bytes);
  37 static int doexec(char **av);
  38 static void usage(void);
  39
  40 int
  41 main(int ac, char **av)
  42 {
  43         int i;
  44         int mask =  VARSYM_ALL_MASK;
  45         int level = VARSYM_USER;
  46         int deleteOpt = 0;
  47         int verboseOpt = 1;
  48         int allOpt = 0;
  49         int execok = 0;
  50         int ret = 0;
  51
  52         while ((i = getopt(ac, av, "adhpqsux")) != -1) {
  53                 switch (i) {
  54                 case 'a':
  55                         allOpt = 1;
  56                         break;
  57                 case 'd':
  58                         deleteOpt = 1;
  59                         break;
  60                 case 'p':
  61                         mask = VARSYM_PROC_MASK;
  62                         level = VARSYM_PROC;
  63                         break;
  64                 case 'q':
  65                         verboseOpt = 0;
  66                         break;
  67                 case 's':
  68                         mask = VARSYM_SYS_MASK;
  69                         level = VARSYM_SYS;
  70                         break;
  71                 case 'u':
  72                         mask = VARSYM_USER_MASK;
  73                         level = VARSYM_USER;
  74                         break;
  75                 case 'x':
  76                         mask = VARSYM_PROC_MASK;
  77                         level = VARSYM_PROC;
  78                         execok = 1;
  79                         break;
  80                 case 'h':
  81                 default:
  82                         usage();
  83                         return(-1);
  84                 }
  85         }
  86
  87         if (allOpt) {
  88                 char buf[1024];
  89                 int marker = 0;
  90                 int bytes;
  91
  92                 for (;;) {
  93                         bytes = varsym_list(level, buf, sizeof(buf), &marker);
  94                         if (bytes < 0)          /* error occured */
  95                             break;
  96                         dumpvars(buf, bytes);
  97                         if (marker < 0)         /* no more vars */
  98                             break;
  99                 }
 100                 if (bytes < 0) {
 101                         fprintf(stderr, "varsym_list(): %s\n", strerror(errno));
 102                         return 1;
 103                 }
 104         }
 105
 106         for ( ; optind < ac; optind++) {
 107                 char *name = av[optind];
 108                 char *data = strchr(name, '=');
 109                 int error;
 110                 char buf[MAXVARSYM_DATA];
 111
 112                 if (data)
 113                         *data++ = 0;
 114
 115                 if (execok) {
 116                         if (deleteOpt) {
 117                                 usage();
 118                                 exit(1);
 119                         }
 120                         if (data) {
 121                                 error = varsym_set(level, name, data);
 122                                 if (error)
 123                                         ret = 2;
 124                         } else {
 125                                 error = doexec(av + optind);
 126                         }
 127                 } else if (deleteOpt) {
 128                         error = varsym_set(level, name, NULL);
 129                         if (error)
 130                                 ret = 2;
 131                 } else if (data) {
 132                         error = varsym_set(level, name, data);
 133                         if (error)
 134                                 ret = 2;
 135                 } else {
 136                         /*
 137                          * NOTE: System call returns 0 on success now,
 138                          *       but older versions returns the content
 139                          *       strlen() + 1, and that had to be tested
 140                          *       for overflow conditions.
 141                          */
 142                         error = varsym_get(mask, name, buf, sizeof(buf));
 143                         if (error >= 0 && error <= (int)sizeof(buf)) {
 144                                 if (verboseOpt)
 145                                         printf("%s=", name);
 146                                 printf("%s\n", buf);
 147                         } else {
 148                                 ret = 1;
 149                         }
 150                 }
 151                 if (error < 0 && verboseOpt)
 152                         fprintf(stderr, "%s: %s\n", name, strerror(errno));
 153         }
 154
 155         return ret;
 156 }
 157
 158 static void
 159 dumpvars(char *buf, int bytes)
 160 {
 161         int b;
 162         int i;
 163         char *vname = NULL;
 164         char *vdata = NULL;
 165
 166         for (b = i = 0; i < bytes; ++i) {
 167                 if (buf[i] == 0) {
 168                         if (vname == NULL) {
 169                                 vname = buf + b;
 170                         } else {
 171                                 vdata = buf + b;
 172                                 printf("%s=%s\n", vname, vdata);
 173                                 vname = vdata = NULL;
 174                         }
 175                         b = i + 1;
 176                 }
 177         }
 178 }
 179
 180 static int
 181 doexec(char **av)
 182 {
 183         int error;
 184
 185         error = execvp(av[0], av);
 186         return (error);
 187 }
 188
 189 static void
 190 usage(void)
 191 {
 192         fprintf(stderr, "usage: varsym [-adpqsu] [var[=data] ...]\n");
 193 }
 194