| | 1 | .\" $NetBSD: sigsuspend.2,v 1.4 1995/02/27 12:37:46 cgd Exp $ |
| | 2 | .\" |
| | 3 | .\" Copyright (c) 1983, 1991, 1993 |
| | 4 | .\" The Regents of the University of California. All rights reserved. |
| | 5 | .\" |
| | 6 | .\" Redistribution and use in source and binary forms, with or without |
| | 7 | .\" modification, are permitted provided that the following conditions |
| | 8 | .\" are met: |
| | 9 | .\" 1. Redistributions of source code must retain the above copyright |
| | 10 | .\" notice, this list of conditions and the following disclaimer. |
| | 11 | .\" 2. Redistributions in binary form must reproduce the above copyright |
| | 12 | .\" notice, this list of conditions and the following disclaimer in the |
| | 13 | .\" documentation and/or other materials provided with the distribution. |
| | 14 | .\" 3. All advertising materials mentioning features or use of this software |
| | 15 | .\" must display the following acknowledgement: |
| | 16 | .\" This product includes software developed by the University of |
| | 17 | .\" California, Berkeley and its contributors. |
| | 18 | .\" 4. Neither the name of the University nor the names of its contributors |
| | 19 | .\" may be used to endorse or promote products derived from this software |
| | 20 | .\" without specific prior written permission. |
| | 21 | .\" |
| | 22 | .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| | 23 | .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| | 24 | .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| | 25 | .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| | 26 | .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| | 27 | .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| | 28 | .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| | 29 | .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| | 30 | .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| | 31 | .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| | 32 | .\" SUCH DAMAGE. |
| | 33 | .\" |
| | 34 | .\" @(#)sigsuspend.2 8.1 (Berkeley) 6/4/93 |
| | 35 | .\" |
| | 36 | .Dd June 4, 1993 |
| | 37 | .Dt SIGSUSPEND 2 |
| | 38 | .Os |
| | 39 | .Sh NAME |
| | 40 | .Nm sigsuspend |
| | 41 | .Nd atomically release blocked signals and wait for interrupt |
| | 42 | .Sh SYNOPSIS |
| | 43 | .Fd #include <signal.h> |
| | 44 | .Ft int |
| | 45 | .Fo sigsuspend |
| | 46 | .Fa "const sigset_t *sigmask" |
| | 47 | .Fc |
| | 48 | .Sh DESCRIPTION |
| | 49 | .Fn Sigsuspend |
| | 50 | temporarily changes the blocked signal mask to the set to which |
| | 51 | .Fa sigmask |
| | 52 | points, |
| | 53 | and then waits for a signal to arrive; |
| | 54 | on return the previous set of masked signals is restored. |
| | 55 | The signal mask set |
| | 56 | is usually empty to indicate that all |
| | 57 | signals are to be unblocked for the duration of the call. |
| | 58 | .Pp |
| | 59 | In normal usage, a signal is blocked using |
| | 60 | .Xr sigprocmask 2 |
| | 61 | to begin a critical section, variables modified on the occurrence |
| | 62 | of the signal are examined to determine that there is no work |
| | 63 | to be done, and the process pauses awaiting work by using |
| | 64 | .Fn sigsuspend |
| | 65 | with the previous mask returned by |
| | 66 | .Xr sigprocmask . |
| | 67 | .Sh RETURN VALUES |
| | 68 | The |
| | 69 | .Fn sigsuspend |
| | 70 | function |
| | 71 | always terminates by being interrupted, returning -1 with |
| | 72 | .Va errno |
| | 73 | set to |
| | 74 | .Dv EINTR . |
| | 75 | .Sh SEE ALSO |
| | 76 | .Xr sigaction 2 , |
| | 77 | .Xr sigprocmask 2 , |
| | 78 | .Xr sigsetops 3 |
| | 79 | .Sh STANDARDS |
| | 80 | The |
| | 81 | .Nm sigsuspend |
| | 82 | function call |
| | 83 | conforms to |
| | 84 | .St -p1003.1-88 . |
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