gfs_pio_error - check file status
#include <gfarm/gfarm.h>
char *gfs_pio_error (GFS_File gf);
The function gfs_pio_error() tests the error indicator for the file
pointed to by gf, returning non-zero if it is set.
NULL There is no error.
Others An error occurred. The reason is shown by its pointed strings.
gfs_pio_create(3), gfs_pio_eof(3), gfs_pio_open(3)