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Annotation of 43BSDTahoe/man/man2/sigstack.2, revision 1.1

1.1     ! root        1: .\" Copyright (c) 1983 Regents of the University of California.
        !             2: .\" All rights reserved.  The Berkeley software License Agreement
        !             3: .\" specifies the terms and conditions for redistribution.
        !             4: .\"
        !             5: .\"    @(#)sigstack.2  6.2 (Berkeley) 6/30/85
        !             6: .\"
        !             7: .TH SIGSTACK 2 "June 30, 1985"
        !             8: .UC 5
        !             9: .SH NAME
        !            10: sigstack \- set and/or get signal stack context
        !            11: .SH SYNOPSIS
        !            12: .nf
        !            13: .B #include <signal.h>
        !            14: .PP
        !            15: .B struct sigstack {
        !            16: .B     caddr_t ss_sp;
        !            17: .B     int     ss_onstack;
        !            18: .B };
        !            19: .PP
        !            20: .B sigstack(ss, oss);
        !            21: .B struct sigstack *ss, *oss;
        !            22: .SH DESCRIPTION
        !            23: .I Sigstack
        !            24: allows users to define an alternate stack on which signals
        !            25: are to be processed.  If
        !            26: .I ss
        !            27: is non-zero,
        !            28: it specifies a
        !            29: .I "signal stack"
        !            30: on which to deliver signals
        !            31: and tells the system if the process is currently executing
        !            32: on that stack.  When a signal's action indicates its handler
        !            33: should execute on the signal stack (specified with a
        !            34: .IR sigvec (2)
        !            35: call), the system checks to see
        !            36: if the process is currently executing on that stack.  If the
        !            37: process is not currently executing on the signal stack,
        !            38: the system arranges a switch to the signal stack for the
        !            39: duration of the signal handler's execution. 
        !            40: If
        !            41: .I oss
        !            42: is non-zero, the current signal stack state is returned.
        !            43: .SH NOTES
        !            44: Signal stacks are not ``grown'' automatically, as is
        !            45: done for the normal stack.  If the stack overflows
        !            46: unpredictable results may occur.
        !            47: .SH "RETURN VALUE
        !            48: Upon successful completion, a value of 0 is returned.
        !            49: Otherwise, a value of \-1 is returned and 
        !            50: .I errno
        !            51: is set to indicate the error.
        !            52: .SH ERRORS
        !            53: .I Sigstack
        !            54: will fail and the signal stack context will remain unchanged
        !            55: if one of the following occurs.
        !            56: .TP 15
        !            57: [EFAULT]
        !            58: Either
        !            59: .I ss
        !            60: or
        !            61: .I oss
        !            62: points to memory that is not a valid part of the process
        !            63: address space.
        !            64: .SH "SEE ALSO"
        !            65: sigvec(2), setjmp(3)

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