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pselect(2): Document what a null pointer for the signalmask means

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When pselect is passed a null pointer for the signal mask, the standard
says it shall behave like select (except for the different timeout
arg). Make a note of that here.

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This commit is contained in:
Warner Losh 2022-07-02 13:39:24 -06:00
parent cf72911158
commit ef86876b84
1 changed files with 9 additions and 2 deletions
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11
lib/libc/sys/pselect.2
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@ -28,7 +28,7 @@
.\" .\"
.\" $FreeBSD$ .\" $FreeBSD$
.\" .\"
.Dd August 16, 2013 .Dd July 2, 2022
.Dt PSELECT 2 .Dt PSELECT 2
.Os .Os
.Sh NAME .Sh NAME
@ -66,7 +66,7 @@ argument in
.Fn pselect .Fn pselect
points to a points to a
.Vt "const struct timespec" .Vt "const struct timespec"
rather than the (modifiable) rather than the potentially modifiable
.Vt "struct timeval" .Vt "struct timeval"
used by used by
.Fn select ; .Fn select ;
@ -81,6 +81,13 @@ specifies a signal mask which is set while waiting for input.
When When
.Fn pselect .Fn pselect
returns, the original signal mask is restored. returns, the original signal mask is restored.
If
.Fa newsigmask
is a null pointer,
.Fn pselect
behaves like
.Fn select
with no setting or restoration of the signal mask.
.Pp .Pp
See See
.Xr select 2 .Xr select 2