#include <unistd.h>
#include <assert.h>
#include <string.h>
#include <fcntl.h>

int main()
{
    char buf[8] = {};

    int fd = open( "file47", O_WRONLY | O_CREAT, 0644 );
    assert( fd >= 0 );

    assert( write( fd, "tralala", 7 ) == 7 );
    assert( close( fd ) == 0 );

    fd = open( "file47", O_RDONLY );
    assert( fd >= 0 );

    int res = read( fd, buf, 7 );
    assert(  res == 7 );
    assert( strcmp( "tralala", buf) == 0 );

    assert( close( fd ) == 0 );
    return 0;
}