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author | rgrimes <rgrimes@FreeBSD.org> | 1994-05-27 05:00:24 +0000 |
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committer | rgrimes <rgrimes@FreeBSD.org> | 1994-05-27 05:00:24 +0000 |
commit | be22b15ae2ff8d7fe06b6e14fddf0c5b444a95da (patch) | |
tree | a18a706dffa5baf86a3b12bbfb4f81caa097f349 /lib/libc/sys/sigprocmask.2 | |
parent | 2a27bd86e6002c871e3b5561a5334653bb222a77 (diff) | |
download | FreeBSD-src-be22b15ae2ff8d7fe06b6e14fddf0c5b444a95da.zip FreeBSD-src-be22b15ae2ff8d7fe06b6e14fddf0c5b444a95da.tar.gz |
BSD 4.4 Lite Lib Sources
Diffstat (limited to 'lib/libc/sys/sigprocmask.2')
-rw-r--r-- | lib/libc/sys/sigprocmask.2 | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/lib/libc/sys/sigprocmask.2 b/lib/libc/sys/sigprocmask.2 new file mode 100644 index 0000000..73b014d --- /dev/null +++ b/lib/libc/sys/sigprocmask.2 @@ -0,0 +1,120 @@ +.\" Copyright (c) 1983, 1991, 1993 +.\" The Regents of the University of California. All rights reserved. +.\" +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions +.\" are met: +.\" 1. Redistributions of source code must retain the above copyright +.\" notice, this list of conditions and the following disclaimer. +.\" 2. Redistributions in binary form must reproduce the above copyright +.\" notice, this list of conditions and the following disclaimer in the +.\" documentation and/or other materials provided with the distribution. +.\" 3. All advertising materials mentioning features or use of this software +.\" must display the following acknowledgement: +.\" This product includes software developed by the University of +.\" California, Berkeley and its contributors. +.\" 4. Neither the name of the University nor the names of its contributors +.\" may be used to endorse or promote products derived from this software +.\" without specific prior written permission. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND +.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE +.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE +.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS +.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY +.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +.\" SUCH DAMAGE. +.\" +.\" @(#)sigprocmask.2 8.1 (Berkeley) 6/4/93 +.\" +.Dd June 4, 1993 +.Dt SIGPROCMASK 2 +.Os +.Sh NAME +.Nm sigprocmask +.Nd manipulate current signal mask +.Sh SYNOPSIS +.Fd #include <signal.h> +.Ft int +.Fn sigprocmask "int how" "const sigset_t *set" "sigset_t *oset" +.Fn sigmask signum +.Sh DESCRIPTION +The +.Fn sigprocmask +function examines and/or changes the current signal mask (those signals +that are blocked from delivery). +Signals are blocked if they are members of the current signal mask set. +.Pp +If +.Fa set +is not null, the action of +.Fn sigprocmask +depends on the value of the parameter +.Fa how . +The signal mask is changed as a function of the specified +.Fa set +and the current mask. +The function is specified by +.Fa how +using one of the following values from +.Aq Pa signal.h : +.Bl -tag -width SIG_UNBLOCK +.It Dv SIG_BLOCK +The new mask is the union of the current mask and the specified +.Fa set . +.It Dv SIG_UNBLOCK +The new mask is the intersection of the current mask +and the complement of the specified +.Fa set . +.It Dv SIG_SETMASK +The current mask is replaced by the specified +.Fa set . +.El +.Pp +If +.Fa oset +is not null, it is set to +the previous value of the signal mask. +When +.Fa set +is null, +the value of +.Ar how +is insignificant and the mask remains unset +providing a way to examine the signal mask without modification. +.Pp +The system +quietly disallows +.Dv SIGKILL +or +.Dv SIGSTOP +to be blocked. +.Sh RETURN VALUES +A 0 value indicated that the call succeeded. A -1 return value +indicates an error occurred and +.Va errno +is set to indicated the reason. +.Sh ERRORS +The +.Fn sigprocmask +call will fail and the signal mask will be unchanged if one +of the following occurs: +.Bl -tag -width Bq Er EINVAL +.It Bq Er EINVAL +.Fa how +has a value other than those listed here. +.Sh SEE ALSO +.Xr kill 2 , +.Xr sigaction 2 , +.Xr sigsetops 3 , +.Xr sigsuspend 2 +.Sh STANDARDS +The +.Nm sigprocmask +function call is expected to +conform to +.St -p1003.1-88 . |