[svn-r21596] Correct large file support test

1 files changed, 31 insertions, 0 deletions

diff --git a/config/cmake/HDF5Tests.c b/config/cmake/HDF5Tests.c
index f580bbc..79741a8 100644
--- a/config/cmake/HDF5Tests.c
+++ b/config/cmake/HDF5Tests.c
@@ -336,6 +336,37 @@ int main()
 }
 #endif
 
+#ifdef TEST_LFS_WORKS
+/* Return 0 when LFS is available and 1 otherwise.  */
+#define _LARGEFILE_SOURCE
+#define _LARGEFILE64_SOURCE
+#define _LARGE_FILES
+#define _FILE_OFFSET_BITS 64
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <assert.h>
+#include <stdio.h>
+
+int main(int argc, char **argv)
+{
+  /* check that off_t can hold 2^63 - 1 and perform basic operations... */
+#define OFF_T_64 (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
+  if (OFF_T_64 % 2147483647 != 1)
+    return 1;
+
+  // stat breaks on SCO OpenServer
+  struct stat buf;
+  stat( argv[0], &buf );
+  if (!S_ISREG(buf.st_mode))
+    return 2;
+
+  FILE *file = fopen( argv[0], "r" );
+  off_t offset = ftello( file );
+  fseek( file, offset, SEEK_CUR );
+  fclose( file );
+  return 0;
+}
+#endif
 
 #ifdef GETTIMEOFDAY_GIVES_TZ
 #ifdef HAVE_SYS_TIME_H