Segment Allocation and File Descriptor Usage

The system allocates a file descriptor, which is inaccessible to the application importing or exporting memory, for each export operation or import operation. The default limit on file descriptor allocation for each process is 256. The importing or exporting application must adjust the allocation limit appropriately. If the application increases the file descriptor limit beyond 256, the values of the file descriptors that are allocated for export segments and import segments starts at 256. These file descriptor values are chosen to avoid interfering with normal file descriptor allocation by the application. This behavior accommodates the use of certain libc functions in 32-bit applications that only work with file descriptor values lower than 256.