diff options
| -rw-r--r-- | lib/libc/sys/sigprocmask.2 | 21 |
1 files changed, 18 insertions, 3 deletions
diff --git a/lib/libc/sys/sigprocmask.2 b/lib/libc/sys/sigprocmask.2 index b619e70af26..346485283b8 100644 --- a/lib/libc/sys/sigprocmask.2 +++ b/lib/libc/sys/sigprocmask.2 @@ -1,4 +1,4 @@ -.\" $OpenBSD: sigprocmask.2,v 1.11 2014/12/14 07:42:50 schwarze Exp $ +.\" $OpenBSD: sigprocmask.2,v 1.12 2017/05/05 02:12:39 millert Exp $ .\" $NetBSD: sigprocmask.2,v 1.6 1995/02/27 12:37:33 cgd Exp $ .\" .\" Copyright (c) 1983, 1991, 1993 @@ -30,7 +30,7 @@ .\" .\" @(#)sigprocmask.2 8.1 (Berkeley) 6/4/93 .\" -.Dd $Mdocdate: December 14 2014 $ +.Dd $Mdocdate: May 5 2017 $ .Dt SIGPROCMASK 2 .Os .Sh NAME @@ -85,6 +85,20 @@ quietly disallows or .Dv SIGSTOP to be blocked. +.Pp +Only signals which are in the pending state will be blocked. +Signals that are explicitly ignored or for which no handler has +been installed and where the default action is to discard the signal +are not held as pending and will be discarded regardless of the +signal mask. +.Pp +Blocked signals remain in the pending state until another call to +.Fn sigprocmask +removes the pending signal(s) from the mask. +If there are unblocked signals that are pending after the signal +mask is updated, at least one will be delivered before +.Fn sigprocmask +returns. .Sh RETURN VALUES .Rv -std .Sh ERRORS @@ -100,10 +114,11 @@ has a value other than those listed here. .Sh SEE ALSO .Xr kill 2 , .Xr sigaction 2 , +.Xr sigpending 2 , .Xr sigsuspend 2 , .Xr sigsetops 3 .Sh STANDARDS The .Fn sigprocmask -function call is expected to conform to +function conforms to .St -p1003.1-2008 . |