7 /* Test reading and writing zero bytes (set status correctly) */
9 int main( int argc, char *argv[] )
12 int size, rank, i, *buf, count;
17 MPI_Init( &argc, &argv );
19 comm = MPI_COMM_WORLD;
20 MPI_File_open( comm, (char*)"/scratch/lib/libsimgrid.so.3.6.2", MPI_MODE_RDWR | MPI_MODE_CREATE | MPI_MODE_DELETE_ON_CLOSE, MPI_INFO_NULL, &fh );
21 MPI_Comm_size( comm, &size );
22 MPI_Comm_rank( comm, &rank );
23 buf = (int *)malloc( 10 * sizeof(int) );
27 MPI_File_seek( fh, sizeof(int)*rank, MPI_SEEK_SET );
28 MPI_File_write_all( fh, buf, 1, MPI_INT, &status );
29 MPI_Get_count( &status, MPI_INT, &count );
32 fprintf( stderr, "Wrong count (%d) on write\n", count );fflush(stderr);
34 /* Write to file, overlapping */
35 MPI_File_seek( fh, sizeof(int)*rank, MPI_SEEK_SET );
36 MPI_File_write_all( fh, buf, 10, MPI_INT, &status );
37 MPI_Get_count( &status, MPI_INT, &count );
40 fprintf( stderr, "Wrong count (%d) on write\n", count );fflush(stderr);
42 /* Read nothing (check status) */
43 memset( &status, 0xff, sizeof(MPI_Status) );
44 MPI_File_read_all( fh, buf, 0, MPI_INT, &status );
45 MPI_Get_count( &status, MPI_INT, &count );
48 fprintf( stderr, "Count not zero (%d) on read\n", count );fflush(stderr);
51 /* Write nothing (check status) */
52 memset( &status, 0xff, sizeof(MPI_Status) );
53 MPI_File_write_all( fh, buf, 0, MPI_INT, &status );
56 fprintf( stderr, "Count not zero (%d) on write\n", count );fflush(stderr);
61 MPI_File_seek( fh, sizeof(int)*rank, MPI_SEEK_SET );
62 for (i=0; i<size; i++) buf[i] = -1;
63 MPI_File_read_all( fh, buf, 10, MPI_INT, &status );
64 // if (buf[0] != rank) {
66 // fprintf( stderr, "%d: buf = %d\n", rank, buf[0] );fflush(stderr);
70 MPI_File_close( &fh );