soft error search

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>

// USAGE: soft-error size
//  size is in mebibytes
//  default 128 MB if not specified

int main( int argc, char *argv[] )
{
    int size = 128;
    if ( argc == 2 )
        size = atoi( argv[1] );
    else if ( argc != 1 )
    {
        fprintf( stderr, "Usage: %s [size_in_MB]\n", argv[0] );
        return 1;
    }

    int bsize = size * 1024 * 1024;

    unsigned char * mp = new unsigned char[bsize];
    if ( mp == 0 )
    {
        fprintf( stderr, "Error: cannot allocate %d bytes.\n", bsize );
        return 2;
    }

    for ( int i = 0; i < bsize; ++i )
        mp[i] = 0x55;

    long start_time = time(0);
    long error_count = 0;
    while ( 1 )
    {
        long current_time = time(0);
        for ( int i = 0; i < bsize; ++i )
            if ( mp[i] != 0x55 )
            {
                printf( "%d seconds, byte %i, got 0x%x, expected 0x55\n", current_time - start_time, i, mp[i] );
                FILE * fp = fopen( "error.log", "a" );
                if ( fp )
                {
                    fprintf( fp, "%d seconds, byte %i, got 0x%x, expected 0x55\n", current_time - start_time, i, mp[i] );
                    fclose( fp );
                }
                ++error_count;
                mp[i] = 0x55;
            }
        sleep(60);
    }
}