Add fxstat check to glibc_syscall_wrappers test.

tests/glibc_syscall_wrappers/test_stat.c

 /*
  * Copyright 2010 The Native Client Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can
  * be found in the LICENSE file.
  */
 
 #include <assert.h>
 #include <errno.h>
 #include <stdio.h>
 #include <sys/stat.h>
 
 #pragma GCC diagnostic ignored "-Wnonnull"
 
 #define KNOWN_FILE_SIZE 30
 
 int main(int argc, char** argv) {
   struct stat st;
   struct stat64 st64;
+  FILE* file;
+  int fileDesc;

[pasko-google - do not use, 2010/12/21 12:00:41]

s/fileDesc/fd/

 
   if (2 != argc) {
     printf("Usage: sel_ldr test_stat.nexe test_stat_data\n");
     return 1;
   }
   st.st_size = 0;
   st64.st_size = 0;
 
   assert(-1 == stat(NULL, &st));
   assert(EFAULT == errno);
   assert(-1 == stat(".", NULL));
   assert(EFAULT == errno);
   errno = 0;
   assert(0 == stat(argv[1], &st));
   assert(0 == errno);
   assert(KNOWN_FILE_SIZE == st.st_size);
 
   assert(-1 == stat64(NULL, &st64));
   assert(EFAULT == errno);
   assert(-1 == stat64(".", NULL));
   assert(EFAULT == errno);
   errno = 0;
   assert(0 == stat64(argv[1], &st64));
   assert(0 == errno);
   assert(KNOWN_FILE_SIZE == st64.st_size);
 
+  file = fopen(argv[1], "r");

[pasko-google - do not use, 2010/12/21 12:00:41]

please, make a separate test_fstat.c

+  assert (NULL != file);
+  fileDesc = fileno(file);
+  assert (0 ==  fstat(fileDesc, &st));
+  assert (KNOWN_FILE_SIZE == st.st_size);

[pasko-google - do not use, 2010/12/21 12:00:41]

also check for errno

+  assert (0 == fstat64(fileDesc, &st64));
+  assert (KNOWN_FILE_SIZE == st64.st_size);
+  assert (0 == fclose(file));
+  errno = 0;
+  assert (-1 == fstat(-1, &st));
+  assert (EBADF == errno);
+  errno = 0;
+  assert (-1 == fstat64(-1, &st64));
+  assert (EBADF == errno);
+
   return 0;
 }