HP-UX Reference (11i v2 04/09) - 2 System Calls (vol 5)

select(2) select(2)

perror ("select failed");

else if (nfound == 0)

printf ("select timed out \n");

else for (i=0, k=0; i < NTTYS && k < NWORDS; k++)

for (j=0; j < NFDBITS && i < NTTYS; j++, i++)

if (ttymask[i] & readfds.fds_bits[k])

/* Read from tty[i]. The code for reading

* is not shown here.

else printf ("tty[%d] is not ready for reading \n",i);

WARNINGS

Check all references to signal(5) for appropriateness on systems that support

sigvector(). sigvec-

tor() can affect the behavior described on this manpage.

The ﬁle descriptor masks are always modiﬁed on return, even if the call returns as the result of a

timeout.

DEPENDENCIES

select() supports the following devices and ﬁle types:

• pipes

• ﬁfo special ﬁles (named pipes)

• all serial devices

• All ITEs (internal terminal emulators) and HP-HIL input devices

• lan(7) special ﬁles

• pty (7) special ﬁles

• sockets

AUTHOR

select() was developed by HP and the University of California, Berkeley.