gen/confstr.c

   1 /*
   2  * Copyright (c) 1999, 2006 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 /*
  24  * Copyright (c) 1993
  25  *      The Regents of the University of California.  All rights reserved.
  26  *
  27  * Redistribution and use in source and binary forms, with or without
  28  * modification, are permitted provided that the following conditions
  29  * are met:
  30  * 1. Redistributions of source code must retain the above copyright
  31  *    notice, this list of conditions and the following disclaimer.
  32  * 2. Redistributions in binary form must reproduce the above copyright
  33  *    notice, this list of conditions and the following disclaimer in the
  34  *    documentation and/or other materials provided with the distribution.
  35  * 3. All advertising materials mentioning features or use of this software
  36  *    must display the following acknowledgement:
  37  *      This product includes software developed by the University of
  38  *      California, Berkeley and its contributors.
  39  * 4. Neither the name of the University nor the names of its contributors
  40  *    may be used to endorse or promote products derived from this software
  41  *    without specific prior written permission.
  42  *
  43  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  44  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  45  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  46  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  47  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  48  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  49  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  50  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  51  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  52  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  53  * SUCH DAMAGE.
  54  */
  55
  56
  57 #include <sys/param.h>
  58 #include <sys/sysctl.h>
  59
  60 #include <errno.h>
  61 #include <paths.h>
  62 #include <stdlib.h>
  63 #include <string.h>
  64 #include <unistd.h>
  65 #include <stdio.h>      /* for P_tmpdir */
  66
  67 #include <dirhelper_priv.h>
  68
  69 extern char *_dirhelper(dirhelper_which_t which, char *path, size_t pathlen);
  70
  71 #if __DARWIN_UNIX03
  72 #define CONFSTR_ERR_RET 0
  73 #else /* !__DARWIN_UNIX03 */
  74 #define CONFSTR_ERR_RET -1
  75 #endif /* __DARWIN_UNIX03 */
  76
  77 size_t
  78 confstr(name, buf, len)
  79         int name;
  80         char *buf;
  81         size_t len;
  82 {
  83         size_t tlen;
  84         int mib[2], sverrno;
  85         char *p;
  86
  87         switch (name) {
  88         case _CS_PATH:
  89                 mib[0] = CTL_USER;
  90                 mib[1] = USER_CS_PATH;
  91                 if (sysctl(mib, 2, NULL, &tlen, NULL, 0) == -1)
  92                         return (CONFSTR_ERR_RET);
  93                 if (len != 0 && buf != NULL) {
  94                         if ((p = malloc(tlen)) == NULL)
  95                                 return (CONFSTR_ERR_RET);
  96                         if (sysctl(mib, 2, p, &tlen, NULL, 0) == -1) {
  97                                 sverrno = errno;
  98                                 free(p);
  99                                 errno = sverrno;
 100                                 return (CONFSTR_ERR_RET);
 101                         }
 102                         /*
 103                          * POSIX 1003.2 requires partial return of
 104                          * the string -- that should be *real* useful.
 105                          */
 106                         (void)strncpy(buf, p, len - 1);
 107                         buf[len - 1] = '\0';
 108                         free(p);
 109                 }
 110                 return (tlen);
 111
 112         case _CS_POSIX_V6_ILP32_OFF32_CFLAGS:
 113         case _CS_XBS5_ILP32_OFF32_CFLAGS:               /* legacy */
 114
 115         case _CS_POSIX_V6_ILP32_OFF32_LDFLAGS:
 116         case _CS_XBS5_ILP32_OFF32_LDFLAGS:              /* legacy */
 117
 118         case _CS_POSIX_V6_ILP32_OFF32_LIBS:
 119         case _CS_XBS5_ILP32_OFF32_LIBS:                 /* legacy */
 120
 121         case _CS_XBS5_ILP32_OFF32_LINTFLAGS:            /* legacy */
 122
 123         case _CS_POSIX_V6_ILP32_OFFBIG_LIBS:
 124         case _CS_XBS5_ILP32_OFFBIG_LIBS:                /* legacy */
 125
 126         case _CS_XBS5_ILP32_OFFBIG_LINTFLAGS:           /* legacy */
 127
 128         case _CS_POSIX_V6_LP64_OFF64_LIBS:
 129         case _CS_XBS5_LP64_OFF64_LIBS:                  /* legacy */
 130
 131         case _CS_XBS5_LP64_OFF64_LINTFLAGS:             /* legacy */
 132
 133         case _CS_POSIX_V6_LPBIG_OFFBIG_LIBS:
 134         case _CS_XBS5_LPBIG_OFFBIG_LIBS:                /* legacy */
 135
 136         case _CS_XBS5_LPBIG_OFFBIG_LINTFLAGS:           /* legacy */
 137                 /* No special flags... yet */
 138                 p = "";
 139                 goto docopy;
 140
 141         case _CS_POSIX_V6_ILP32_OFFBIG_CFLAGS:
 142         case _CS_XBS5_ILP32_OFFBIG_CFLAGS:              /* legacy */
 143
 144         case _CS_POSIX_V6_ILP32_OFFBIG_LDFLAGS:
 145         case _CS_XBS5_ILP32_OFFBIG_LDFLAGS:             /* legacy */
 146                 p = "-W 32";
 147                 goto docopy;
 148
 149         case _CS_POSIX_V6_LP64_OFF64_CFLAGS:
 150         case _CS_XBS5_LP64_OFF64_CFLAGS:                /* legacy */
 151
 152         case _CS_POSIX_V6_LP64_OFF64_LDFLAGS:
 153         case _CS_XBS5_LP64_OFF64_LDFLAGS:               /* legacy */
 154
 155         case _CS_POSIX_V6_LPBIG_OFFBIG_CFLAGS:
 156         case _CS_XBS5_LPBIG_OFFBIG_CFLAGS:              /* legacy */
 157
 158         case _CS_POSIX_V6_LPBIG_OFFBIG_LDFLAGS:
 159         case _CS_XBS5_LPBIG_OFFBIG_LDFLAGS:             /* legacy */
 160                 p = "-W 64";
 161                 goto docopy;
 162
 163         case _CS_POSIX_V6_WIDTH_RESTRICTED_ENVS:
 164                 if (sizeof(long) >= 8)
 165                         p = "_POSIX_V6_LP64_OFF64";
 166                 else
 167                         p = "_POSIX_V6_ILP32_OFFBIG";
 168
 169 docopy:
 170                 if (len != 0 && buf != NULL)
 171                         strlcpy(buf, p, len);
 172                 return (strlen(p) + 1);
 173
 174         case _CS_DARWIN_USER_DIR:
 175                 if ((p = alloca(PATH_MAX)) == NULL) {
 176                         errno = ENOMEM;
 177                         return (CONFSTR_ERR_RET);
 178                 }
 179                 if (_dirhelper(DIRHELPER_USER_LOCAL, p, PATH_MAX) == NULL) {
 180                         if (errno != ENOMEM)
 181                                 errno = EIO;
 182                         return (CONFSTR_ERR_RET);
 183                 }
 184                 goto docopy;
 185
 186         case _CS_DARWIN_USER_TEMP_DIR:
 187                 if ((p = alloca(PATH_MAX)) == NULL) {
 188                         errno = ENOMEM;
 189                         return (CONFSTR_ERR_RET);
 190                 }
 191                 if (_dirhelper(DIRHELPER_USER_LOCAL_TEMP, p, PATH_MAX) == NULL) {
 192                         int dh_errno = errno;
 193                         /*
 194                          * If _dirhelper() fails, try TMPDIR and P_tmpdir,
 195                          * finally failing otherwise.
 196                          */
 197                         if ((p = getenv("TMPDIR")) && access(p, W_OK) == 0)
 198                                 goto docopy;
 199                         if (access(p = P_tmpdir, W_OK) == 0)
 200                                 goto docopy;
 201                         if (dh_errno == ENOMEM)
 202                                 errno = ENOMEM;
 203                         else
 204                                 errno = EIO;
 205                         return (CONFSTR_ERR_RET);
 206                 }
 207                 goto docopy;
 208
 209         case _CS_DARWIN_USER_CACHE_DIR:
 210                 if ((p = alloca(PATH_MAX)) == NULL) {
 211                         errno = ENOMEM;
 212                         return (CONFSTR_ERR_RET);
 213                 }
 214                 if (_dirhelper(DIRHELPER_USER_LOCAL_CACHE, p, PATH_MAX) == NULL) {
 215                         if (errno != ENOMEM)
 216                                 errno = EIO;
 217                         return (CONFSTR_ERR_RET);
 218                 }
 219                 goto docopy;
 220
 221         default:
 222                 errno = EINVAL;
 223                 return (0);
 224         }
 225         /* NOTREACHED */
 226 }