| PSELECT(2) | System Calls Manual | PSELECT(2) |
pselect —
synchronous I/O multiplexing a la POSIX.1g
Standard C Library (libc, -lc)
#include
<sys/select.h>
int
pselect(int nfds,
fd_set *restrict readfds, fd_set
*restrict writefds, fd_set *restrict errorfds,
const struct timespec *restrict timeout,
const sigset_t *restrict sigmask);
The
pselect()
function was introduced by IEEE Std 1003.1g-2000
(“POSIX.1g”) as a slightly stronger version of
select(2). The nfds,
readfds, writefds, and
errorfds arguments are all identical to the analogous
arguments of
select().
The timeout argument in
pselect() points to a const struct
timespec, rather than the (modifiable) struct
timeval used by select(); as in
select(), a null pointer may be passed to indicate
that pselect() should wait indefinitely. Finally,
sigmask specifies a signal mask which is set while
waiting for input. When pselect() returns, the
original signal mask is restored.
See select(2) for a more detailed discussion of the semantics of this interface, and for macros used to manipulate the fd_set data type.
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).
The pselect() function conforms to
IEEE Std 1003.1-2001 (“POSIX.1”).
The pselect() function first appeared in
FreeBSD 5.0.
The pselect() manual page was written by
Garrett Wollman
⟨wollman@FreeBSD.org⟩.
| June 16, 2002 | Mac OS X 12 |