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    41 

    42 /* Sample program for configure to test Large File support on target

    43 platforms.

    44 */

    45 

    46 #define _LARGEFILE_SOURCE

    47 #define _LARGE_FILES

    48 #define _FILE_OFFSET_BITS 64

    49 #include <unistd.h>

    50 #include <sys/types.h>

    51 #include <sys/stat.h>

    52 #include <assert.h>

    53 #include <stdio.h>

    54 

    55 int main( int, char **argv )

    56 {

    57 // check that off_t can hold 2^63 - 1 and perform basic operations...

    58 #define OFF_T_64 (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))

    59     if (OFF_T_64 % 2147483647 != 1)

    60 	return 1;

    61 

    62     // stat breaks on SCO OpenServer

    63     struct stat buf;

    64     stat( argv[0], &buf );

    65     if (!S_ISREG(buf.st_mode))

    66 	return 2;

    67 

    68     FILE *file = fopen( argv[0], "r" );

    69     off_t offset = ftello( file );

    70     fseek( file, offset, SEEK_CUR );

    71     fclose( file );

    72     return 0;

    73 }