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Annotation of 43BSDReno/lib/libc/sys/sigstack.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: .\"    @(#)sigstack.2  6.4 (Berkeley) 6/23/90
        !            19: .\"
        !            20: .TH SIGSTACK 2 "June 23, 1990"
        !            21: .UC 5
        !            22: .SH NAME
        !            23: sigstack \- set and/or get signal stack context
        !            24: .SH SYNOPSIS
        !            25: .nf
        !            26: .B #include <signal.h>
        !            27: .PP
        !            28: .B struct sigstack {
        !            29: .B     caddr_t ss_sp;
        !            30: .B     int     ss_onstack;
        !            31: .B };
        !            32: .PP
        !            33: .B sigstack(ss, oss);
        !            34: .B struct sigstack *ss, *oss;
        !            35: .SH DESCRIPTION
        !            36: .I Sigstack
        !            37: allows users to define an alternate stack on which signals
        !            38: are to be processed.  If
        !            39: .I ss
        !            40: is non-zero,
        !            41: it specifies a
        !            42: .I "signal stack"
        !            43: on which to deliver signals
        !            44: and tells the system if the process is currently executing
        !            45: on that stack.  When a signal's action indicates its handler
        !            46: should execute on the signal stack (specified with a
        !            47: .IR sigvec (2)
        !            48: call), the system checks to see
        !            49: if the process is currently executing on that stack.  If the
        !            50: process is not currently executing on the signal stack,
        !            51: the system arranges a switch to the signal stack for the
        !            52: duration of the signal handler's execution. 
        !            53: If
        !            54: .I oss
        !            55: is non-zero, the current signal stack state is returned.
        !            56: .SH NOTES
        !            57: Signal stacks are not ``grown'' automatically, as is
        !            58: done for the normal stack.  If the stack overflows
        !            59: unpredictable results may occur.
        !            60: .SH "RETURN VALUE
        !            61: Upon successful completion, a value of 0 is returned.
        !            62: Otherwise, a value of \-1 is returned and 
        !            63: .I errno
        !            64: is set to indicate the error.
        !            65: .SH ERRORS
        !            66: .I Sigstack
        !            67: will fail and the signal stack context will remain unchanged
        !            68: if one of the following occurs.
        !            69: .TP 15
        !            70: [EFAULT]
        !            71: Either
        !            72: .I ss
        !            73: or
        !            74: .I oss
        !            75: points to memory that is not a valid part of the process
        !            76: address space.
        !            77: .SH "SEE ALSO"
        !            78: sigvec(2), setjmp(3)

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