sysctl.tproj/pathconf.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * "Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
   7  * Reserved.  This file contains Original Code and/or Modifications of
   8  * Original Code as defined in and that are subject to the Apple Public
   9  * Source License Version 1.0 (the 'License').  You may not use this file
  10  * except in compliance with the License.  Please obtain a copy of the
  11  * License at http://www.apple.com/publicsource and read it before using
  12  * this file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  19  * License for the specific language governing rights and limitations
  20  * under the License."
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23  */
  24 /*
  25  * Copyright (c) 1993
  26  *      The Regents of the University of California.  All rights reserved.
  27  *
  28  * Redistribution and use in source and binary forms, with or without
  29  * modification, are permitted provided that the following conditions
  30  * are met:
  31  * 1. Redistributions of source code must retain the above copyright
  32  *    notice, this list of conditions and the following disclaimer.
  33  * 2. Redistributions in binary form must reproduce the above copyright
  34  *    notice, this list of conditions and the following disclaimer in the
  35  *    documentation and/or other materials provided with the distribution.
  36  * 3. All advertising materials mentioning features or use of this software
  37  *    must display the following acknowledgement:
  38  *      This product includes software developed by the University of
  39  *      California, Berkeley and its contributors.
  40  * 4. Neither the name of the University nor the names of its contributors
  41  *    may be used to endorse or promote products derived from this software
  42  *    without specific prior written permission.
  43  *
  44  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  45  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  46  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  47  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  48  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  49  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  50  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  51  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  52  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  53  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  54  * SUCH DAMAGE.
  55  */
  56
  57 #ifndef lint
  58 static char copyright[] =
  59 "@(#) Copyright (c) 1993\n\
  60         The Regents of the University of California.  All rights reserved.\n";
  61 #endif /* not lint */
  62
  63 #ifndef lint
  64 static char sccsid[] = "@(#)pathconf.c  8.1 (Berkeley) 6/6/93";
  65 #endif /* not lint */
  66
  67 #include <sys/param.h>
  68 #include <sys/sysctl.h>
  69 #include <sys/unistd.h>
  70
  71 #include <errno.h>
  72 #include <stdio.h>
  73 #include <stdlib.h>
  74 #include <string.h>
  75
  76 #define PC_NAMES { \
  77         { 0, 0 }, \
  78         { "link_max", CTLTYPE_INT }, \
  79         { "max_canon", CTLTYPE_INT }, \
  80         { "max_input", CTLTYPE_INT }, \
  81         { "name_max", CTLTYPE_INT }, \
  82         { "path_max", CTLTYPE_INT }, \
  83         { "pipe_buf", CTLTYPE_INT }, \
  84         { "chown_restricted", CTLTYPE_INT }, \
  85         { "no_trunc", CTLTYPE_INT }, \
  86         { "vdisable", CTLTYPE_INT }, \
  87 }
  88 #define PC_MAXID 10
  89
  90 struct ctlname pcnames[] = PC_NAMES;
  91 char names[BUFSIZ];
  92
  93 struct list {
  94         struct  ctlname *list;
  95         int     size;
  96 };
  97 struct list pclist = { pcnames, PC_MAXID };
  98
  99 int     Aflag, aflag, nflag, wflag, stdinflag;
 100
 101 int
 102 main(argc, argv)
 103         int argc;
 104         char *argv[];
 105 {
 106         extern char *optarg;
 107         extern int optind;
 108         char *path;
 109         int ch;
 110
 111         while ((ch = getopt(argc, argv, "Aan")) != EOF) {
 112                 switch (ch) {
 113
 114                 case 'A':
 115                         Aflag = 1;
 116                         break;
 117
 118                 case 'a':
 119                         aflag = 1;
 120                         break;
 121
 122                 case 'n':
 123                         nflag = 1;
 124                         break;
 125
 126                 default:
 127                         usage();
 128                 }
 129         }
 130         argc -= optind;
 131         argv += optind;
 132
 133         if (argc == 0)
 134                 usage();
 135         path = *argv++;
 136         if (strcmp(path, "-") == 0)
 137                 stdinflag = 1;
 138         argc--;
 139         if (Aflag || aflag) {
 140                 listall(path, &pclist);
 141                 exit(0);
 142         }
 143         if (argc == 0)
 144                 usage();
 145         while (argc-- > 0)
 146                 parse(path, *argv, 1);
 147         exit(0);
 148 }
 149
 150 /*
 151  * List all variables known to the system.
 152  */
 153 listall(path, lp)
 154         char *path;
 155         struct list *lp;
 156 {
 157         int lvl2;
 158
 159         if (lp->list == 0)
 160                 return;
 161         for (lvl2 = 0; lvl2 < lp->size; lvl2++) {
 162                 if (lp->list[lvl2].ctl_name == 0)
 163                         continue;
 164                 parse(path, lp->list[lvl2].ctl_name, Aflag);
 165         }
 166 }
 167
 168 /*
 169  * Parse a name into an index.
 170  * Lookup and print out the attribute if it exists.
 171  */
 172 parse(pathname, string, flags)
 173         char *pathname;
 174         char *string;
 175         int flags;
 176 {
 177         int indx, value;
 178         char *bufp, buf[BUFSIZ];
 179
 180         bufp = buf;
 181         snprintf(buf, BUFSIZ, "%s", string);
 182         if ((indx = findname(string, "top", &bufp, &pclist)) == -1)
 183                 return;
 184         if (bufp) {
 185                 fprintf(stderr, "name %s in %s is unknown\n", *bufp, string);
 186                 return;
 187         }
 188         if (stdinflag)
 189                 value = fpathconf(0, indx);
 190         else
 191                 value = pathconf(pathname, indx);
 192         if (value == -1) {
 193                 if (flags == 0)
 194                         return;
 195                 switch (errno) {
 196                 case ENOTSUP:
 197                         fprintf(stderr, "%s: value is not available\n", string);
 198                         return;
 199                 case ENOTDIR:
 200                         fprintf(stderr, "%s: specification is incomplete\n",
 201                             string);
 202                         return;
 203                 case ENOMEM:
 204                         fprintf(stderr, "%s: type is unknown to this program\n",
 205                             string);
 206                         return;
 207                 default:
 208                         perror(string);
 209                         return;
 210                 }
 211         }
 212         if (!nflag)
 213                 fprintf(stdout, "%s = ", string);
 214         fprintf(stdout, "%d\n", value);
 215 }
 216
 217 /*
 218  * Scan a list of names searching for a particular name.
 219  */
 220 findname(string, level, bufp, namelist)
 221         char *string;
 222         char *level;
 223         char **bufp;
 224         struct list *namelist;
 225 {
 226         char *name;
 227         int i;
 228
 229         if (namelist->list == 0 || (name = strsep(bufp, ".")) == NULL) {
 230                 fprintf(stderr, "%s: incomplete specification\n", string);
 231                 return (-1);
 232         }
 233         for (i = 0; i < namelist->size; i++)
 234                 if (namelist->list[i].ctl_name != NULL &&
 235                     strcmp(name, namelist->list[i].ctl_name) == 0)
 236                         break;
 237         if (i == namelist->size) {
 238                 fprintf(stderr, "%s level name %s in %s is invalid\n",
 239                     level, name, string);
 240                 return (-1);
 241         }
 242         return (i);
 243 }
 244
 245 usage()
 246 {
 247
 248         (void)fprintf(stderr, "usage:\t%s\n\t%s\n\t%s\n",
 249             "pathname [-n] variable ...",
 250             "pathname [-n] -a", "pathname [-n] -A");
 251         exit(1);
 252 }