sbin/sysctl/pathconf.c

   1 /*      $NetBSD: pathconf.c,v 1.6 2003/08/07 10:04:40 agc Exp $ */
   2
   3 /*
   4  * Copyright (c) 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #ifndef lint
  33 static char copyright[] =
  34 "@(#) Copyright (c) 1993\n\
  35         The Regents of the University of California.  All rights reserved.\n";
  36 #endif /* not lint */
  37
  38 #ifndef lint
  39 #if 0
  40 static char sccsid[] = "@(#)pathconf.c  8.1 (Berkeley) 6/6/93";
  41 #else
  42 static char rcsid[] = "$NetBSD: pathconf.c,v 1.6 2003/08/07 10:04:40 agc Exp $";
  43 #endif
  44 #endif /* not lint */
  45
  46 #include <sys/param.h>
  47 #include <sys/sysctl.h>
  48 #include <sys/unistd.h>
  49
  50 #include <errno.h>
  51 #include <stdio.h>
  52 #include <stdlib.h>
  53 #include <string.h>
  54
  55 #define PC_NAMES { \
  56         { 0, 0 }, \
  57         { "link_max", CTLTYPE_INT }, \
  58         { "max_canon", CTLTYPE_INT }, \
  59         { "max_input", CTLTYPE_INT }, \
  60         { "name_max", CTLTYPE_INT }, \
  61         { "path_max", CTLTYPE_INT }, \
  62         { "pipe_buf", CTLTYPE_INT }, \
  63         { "chown_restricted", CTLTYPE_INT }, \
  64         { "no_trunc", CTLTYPE_INT }, \
  65         { "vdisable", CTLTYPE_INT }, \
  66 }
  67 #define PC_MAXID 10
  68
  69 struct ctlname pcnames[] = PC_NAMES;
  70 char names[BUFSIZ];
  71
  72 struct list {
  73         struct  ctlname *list;
  74         int     size;
  75 };
  76 struct list pclist = { pcnames, PC_MAXID };
  77
  78 int     Aflag, aflag, nflag, wflag, stdinflag;
  79
  80 int
  81 main(argc, argv)
  82         int argc;
  83         char *argv[];
  84 {
  85         char *path;
  86         int ch;
  87
  88         while ((ch = getopt(argc, argv, "Aan")) != -1) {
  89                 switch (ch) {
  90
  91                 case 'A':
  92                         Aflag = 1;
  93                         break;
  94
  95                 case 'a':
  96                         aflag = 1;
  97                         break;
  98
  99                 case 'n':
 100                         nflag = 1;
 101                         break;
 102
 103                 default:
 104                         usage();
 105                 }
 106         }
 107         argc -= optind;
 108         argv += optind;
 109
 110         if (argc == 0)
 111                 usage();
 112         path = *argv++;
 113         if (strcmp(path, "-") == 0)
 114                 stdinflag = 1;
 115         argc--;
 116         if (Aflag || aflag) {
 117                 listall(path, &pclist);
 118                 exit(0);
 119         }
 120         if (argc == 0)
 121                 usage();
 122         while (argc-- > 0)
 123                 parse(path, *argv, 1);
 124         exit(0);
 125 }
 126
 127 /*
 128  * List all variables known to the system.
 129  */
 130 listall(path, lp)
 131         char *path;
 132         struct list *lp;
 133 {
 134         int lvl2;
 135
 136         if (lp->list == 0)
 137                 return;
 138         for (lvl2 = 0; lvl2 < lp->size; lvl2++) {
 139                 if (lp->list[lvl2].ctl_name == 0)
 140                         continue;
 141                 parse(path, lp->list[lvl2].ctl_name, Aflag);
 142         }
 143 }
 144
 145 /*
 146  * Parse a name into an index.
 147  * Lookup and print out the attribute if it exists.
 148  */
 149 parse(pathname, string, flags)
 150         char *pathname;
 151         char *string;
 152         int flags;
 153 {
 154         int indx, value;
 155         char *bufp, buf[BUFSIZ];
 156
 157         bufp = buf;
 158         snprintf(buf, BUFSIZ, "%s", string);
 159         if ((indx = findname(string, "top", &bufp, &pclist)) == -1)
 160                 return;
 161         if (bufp) {
 162                 fprintf(stderr, "name %s in %s is unknown\n", *bufp, string);
 163                 return;
 164         }
 165         if (stdinflag)
 166                 value = fpathconf(0, indx);
 167         else
 168                 value = pathconf(pathname, indx);
 169         if (value == -1) {
 170                 if (flags == 0)
 171                         return;
 172                 switch (errno) {
 173                 case EOPNOTSUPP:
 174                         fprintf(stderr, "%s: value is not available\n", string);
 175                         return;
 176                 case ENOTDIR:
 177                         fprintf(stderr, "%s: specification is incomplete\n",
 178                             string);
 179                         return;
 180                 case ENOMEM:
 181                         fprintf(stderr, "%s: type is unknown to this program\n",
 182                             string);
 183                         return;
 184                 default:
 185                         perror(string);
 186                         return;
 187                 }
 188         }
 189         if (!nflag)
 190                 fprintf(stdout, "%s = ", string);
 191         fprintf(stdout, "%d\n", value);
 192 }
 193
 194 /*
 195  * Scan a list of names searching for a particular name.
 196  */
 197 findname(string, level, bufp, namelist)
 198         char *string;
 199         const char *level;
 200         char **bufp;
 201         struct list *namelist;
 202 {
 203         char *name;
 204         int i;
 205
 206         if (namelist->list == 0 || (name = strsep(bufp, ".")) == NULL) {
 207                 fprintf(stderr, "%s: incomplete specification\n", string);
 208                 return (-1);
 209         }
 210         for (i = 0; i < namelist->size; i++)
 211                 if (namelist->list[i].ctl_name != NULL &&
 212                     strcmp(name, namelist->list[i].ctl_name) == 0)
 213                         break;
 214         if (i == namelist->size) {
 215                 fprintf(stderr, "%s level name %s in %s is invalid\n",
 216                     level, name, string);
 217                 return (-1);
 218         }
 219         return (i);
 220 }
 221
 222 usage()
 223 {
 224
 225         (void)fprintf(stderr, "usage:\t%s\n\t%s\n\t%s\n",
 226             "pathname [-n] variable ...",
 227             "pathname [-n] -a", "pathname [-n] -A");
 228         exit(1);
 229 }