// S : tags   kleetodo c  $TAGS
// S : expect --result valid
// S : cc     -o test.bc  $CC_OPT $file
// S : verify  $V_OPT -o nofail:vfs test.bc

#include <fcntl.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/trace.h>
#include <errno.h>
#include <assert.h>

int main()
{
    int fd = creat( "file", S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH );
    assert( fd != -1 );
    int bytes = write( fd, "hello\n", 6 );
    __dios_trace_f( "bytes = %d, errno = %d", bytes, errno );
    assert( bytes == 6 );
    close( fd );
    fd = open( "file", O_RDONLY );
    assert( fd != -1 );
    char buf[6];
    bytes = read( fd, &buf, 6 );
    __dios_trace_f( "bytes = %d", bytes );
    assert( bytes == 6 );
    assert( buf[0] == 'h' && buf[1] == 'e' && buf[2] == 'l' &&
            buf[3] == 'l' && buf[4] == 'o' && buf[5] == '\n' );
    close( fd );
    return 0;
}