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, write to the Free Software
  16  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18
  19 #include <errno.h>
  20 #include <dlfcn.h>
  21 #include <sys/utsname.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <stdio.h>
  25 #include <unistd.h>
  26
  27 #include "testsuite.h"
  28
  29 TS_EXPORT int uname(struct utsname *u)
  30 {
  31         static void *nextlib = NULL;
  32         static int (*nextlib_uname)(struct utsname *u);
  33         const char *release;
  34         int err;
  35         size_t sz;
  36
  37         if (nextlib == NULL) {
  38 #ifdef RTLD_NEXT
  39                 nextlib = RTLD_NEXT;
  40 #else
  41                 nextlib = dlopen("libc.so.6", RTLD_LAZY);
  42 #endif
  43                 nextlib_uname = dlsym(nextlib, "uname");
  44         }
  45
  46         err = nextlib_uname(u);
  47         if (err < 0)
  48                 return err;
  49
  50         if (!environ)
  51                 /*
  52                  * probably called from within glibc before main(); unsafe
  53                  * to call getenv()
  54                  */
  55                 return 0;
  56
  57         release = getenv(S_TC_UNAME_R);
  58         if (release == NULL) {
  59                 fprintf(stderr, "TRAP uname(): missing export %s?\n",
  60                                                         S_TC_UNAME_R);
  61                 return 0;
  62         }
  63
  64         sz = strlen(release) + 1;
  65         if (sz > sizeof(u->release)) {
  66                 fprintf(stderr, "uname(): sizeof release (%s) "
  67                                 "is greater than available space: %zu",
  68                                 release, sizeof(u->release));
  69                 errno = -EFAULT;
  70                 return -1;
  71         }
  72
  73         memcpy(u->release, release, sz);
  74         return 0;
  75 }