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Annotation of 43BSDReno/lib/libc/sys/sigprocmask.2, revision 1.1

1.1     ! root        1: .\" Copyright (c) 1983 The Regents of the University of California.
        !             2: .\" All rights reserved.
        !             3: .\"
        !             4: .\" Redistribution and use in source and binary forms are permitted provided
        !             5: .\" that: (1) source distributions retain this entire copyright notice and
        !             6: .\" comment, and (2) distributions including binaries display the following
        !             7: .\" acknowledgement:  ``This product includes software developed by the
        !             8: .\" University of California, Berkeley and its contributors'' in the
        !             9: .\" documentation or other materials provided with the distribution and in
        !            10: .\" all advertising materials mentioning features or use of this software.
        !            11: .\" Neither the name of the University nor the names of its contributors may
        !            12: .\" be used to endorse or promote products derived from this software without
        !            13: .\" specific prior written permission.
        !            14: .\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            15: .\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            16: .\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            17: .\"
        !            18: .\"    @(#)sigprocmask.2       6.1 (Berkeley) 7/1/90
        !            19: .\"
        !            20: .TH SIGPROCMASK 2 "July 1, 1990"
        !            21: .UC 7
        !            22: .SH NAME
        !            23: sigprocmask \- manipulate current signal mask
        !            24: .SH SYNOPSIS
        !            25: .nf
        !            26: .B #include <signal.h>
        !            27: 
        !            28: .B sigprocmask(how, set, oset);
        !            29: .B int how;
        !            30: .B sigset_t *set, *oset;
        !            31: 
        !            32: .B mask = sigmask(signum)
        !            33: .SH DESCRIPTION
        !            34: The
        !            35: .I sigsetmask
        !            36: function examines and/or the current signal mask (those signals
        !            37: that are blocked from delivery).
        !            38: Signals are blocked if they are members of the current signal mask set.
        !            39: .PP
        !            40: If
        !            41: .I set
        !            42: is not null, the action of
        !            43: .I sigsetmask
        !            44: depends on the value of the parameter
        !            45: .IR how .
        !            46: The signal mask is changed as a function of the specified
        !            47: .I set
        !            48: and the current mask.
        !            49: The function is specified by
        !            50: .I how
        !            51: using one of the following values from <signal.h>:
        !            52: .IP SIG_BLOCK \w'SIG_SETMASK\0\0'u
        !            53: The new mask is the union of the current mask and the specified
        !            54: .IR set .
        !            55: .IP SIG_UNBLOCK \w'SIG_SETMASK\0\0'u
        !            56: The new mask is the intersection of the current mask
        !            57: and the complement of the specified
        !            58: .IR set .
        !            59: .IP SIG_SETMASK \w'SIG_SETMASK\0\0'u
        !            60: The current mask is replaced by the specified
        !            61: .IR set .
        !            62: .PP
        !            63: If
        !            64: .I oset
        !            65: is not null,
        !            66: the previous value of the signal mask.
        !            67: When
        !            68: .I set
        !            69: is null, this provides a way to examine the signal mask without changing it.
        !            70: .PP
        !            71: The system
        !            72: quietly disallows SIGKILL or SIGSTOP to be blocked.
        !            73: .SH "RETURN VALUE
        !            74: A 0 value indicated that the call succeeded.  A \-1 return value
        !            75: indicates an error occurred and
        !            76: .I errno
        !            77: is set to indicated the reason.
        !            78: .SH ERRORS
        !            79: The
        !            80: .I sigprocmask
        !            81: call will fail and the signal mask will be unchanged if one
        !            82: of the following occurs:
        !            83: .TP 15
        !            84: [EINVAL]
        !            85: .I how
        !            86: has a value other than those listed here.
        !            87: .SH "SEE ALSO"
        !            88: kill(2), sigaction(2), sigsetops(2), sigsuspend(2)

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