testsuite/uname.c

   1 /*
   2  * Copyright (C) 2012-2013  ProFUSION embedded systems
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include <dlfcn.h>
  19 #include <errno.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <unistd.h>
  24 #include <sys/utsname.h>
  25
  26 #include "testsuite.h"
  27
  28 TS_EXPORT int uname(struct utsname *u)
  29 {
  30         static void *nextlib = NULL;
  31         static int (*nextlib_uname)(struct utsname *u);
  32         const char *release;
  33         int err;
  34         size_t sz;
  35
  36         if (nextlib == NULL) {
  37 #ifdef RTLD_NEXT
  38                 nextlib = RTLD_NEXT;
  39 #else
  40                 nextlib = dlopen("libc.so.6", RTLD_LAZY);
  41 #endif
  42                 nextlib_uname = dlsym(nextlib, "uname");
  43         }
  44
  45         err = nextlib_uname(u);
  46         if (err < 0)
  47                 return err;
  48
  49         if (!environ)
  50                 /*
  51                  * probably called from within glibc before main(); unsafe
  52                  * to call getenv()
  53                  */
  54                 return 0;
  55
  56         release = getenv(S_TC_UNAME_R);
  57         if (release == NULL) {
  58                 fprintf(stderr, "TRAP uname(): missing export %s?\n",
  59                                                         S_TC_UNAME_R);
  60                 return 0;
  61         }
  62
  63         sz = strlen(release) + 1;
  64         if (sz > sizeof(u->release)) {
  65                 fprintf(stderr, "uname(): sizeof release (%s) "
  66                                 "is greater than available space: %zu",
  67                                 release, sizeof(u->release));
  68                 errno = -EFAULT;
  69                 return -1;
  70         }
  71
  72         memcpy(u->release, release, sz);
  73         return 0;
  74 }