0 if
.I signum
is not a member, and \-1 on error.
+
On error, these functions set
.I errno
-to indicate the cause.
+to indicate the cause of the error.
.SH ERRORS
.TP
.B EINVAL
.BR sigprocmask (2),
.BR sigsuspend (2)
.SH COLOPHON
-This page is part of release 3.75 of the Linux
+This page is part of release 3.76 of the Linux
.I man-pages
project.
A description of the project,