LIBRARY
Lb libcSYNOPSIS
In sys/select.h Ft int Fo pselect Fa int nfds Fa fd_set * restrict readfds Fa fd_set * restrict writefds Fa fd_set * restrict exceptfds Fa const struct timespec * restrict timeout Fa const sigset_t * restrict newsigmask FcDESCRIPTION
The Fn pselect function was introduced by St -p1003.1g-2000 as a slightly stronger version of select(2). The Fa nfds , readfds , writefds , and Fa exceptfds arguments are all identical to the analogous arguments of Fn select . The Fa timeout argument in Fn pselect points to a Vt const struct timespec rather than the (modifiable) Vt struct timeval used by Fn select ; as in Fn select , a null pointer may be passed to indicate that Fn pselect should wait indefinitely. Finally, Fa newsigmask specifies a signal mask which is set while waiting for input. When Fn 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 Vt fd_set data type.
RETURN VALUES
The Fn pselect function returns the same values and under the same conditions as Fn select .ERRORS
The Fn pselect function may fail for any of the reasons documented for select(2) and (if a signal mask is provided) sigprocmask(2).STANDARDS
The Fn pselect function conforms to St -p1003.1-2001 .HISTORY
The Fn pselect function first appeared in Fx 5.0 .AUTHORS
The first implementation of Fn pselect function and this manual page were written by An Garrett Wollman Aq [email protected] .