int open (char * filename, int flags);
</para>
<para>
-flags may be O_RDONLY, O_WRONLY, O_RDWR and many others, some not
+flags may be O\_RDONLY, O\_WRONLY, O\_RDWR and many others, some not
important for devices.
</para>
<para>
Example:
</para>
<para>
-fd = open ("/dev/ttyS0", O_RDWR);
+fd = open ("/dev/ttyS0", O\_RDWR);
</para>
</foil>