pselect(2freebsd)

pselect - synchronous I/O multiplexing a la POSIX.1g

.Lb libc

.In sys/select.h int
.Fo pselect int nfds fd_set * restrict readfds fd_set * restrict writefds fd_set * restrict exceptfds const struct timespec * restrict timeout const sigset_t * restrict newsigmask
.Fc

The pselect function was introduced by -p1003.1g-2000 as a slightly stronger version of select(2). The nfds, readfds, writefds, and exceptfds arguments are all identical to the analogous arguments of select. The timeout argument in pselect points to a
.Vt const struct timespec rather than the (modifiable)
.Vt struct timeval used by select; as in select, a null pointer may be passed to indicate that pselect should wait indefinitely. Finally, newsigmask specifies a signal mask which is set while waiting for input. When pselect returns, the original signal mask is restored.

The pselect function returns the same values and under the same conditions as select.

The pselect function may fail for any of the reasons documented for select(2) and (if a signal mask is provided) sigprocmask(2).

kqueue(2), poll(2), select(2), sigprocmask(2), sigsuspend(2)

The pselect function conforms to -p1003.1-2001.

The pselect function first appeared in
.Fx 5.0 .

The first implementation of pselect function and this manual page were written by
.An Garrett Wollman Aq Mt wollman .