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

1.1     ! root        1: .\" Copyright (c) 1985 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: .\"    @(#)sigreturn.2 6.4 (Berkeley) 6/23/90
        !            19: .\"
        !            20: .TH SIGRETURN 2 "June 23, 1990"
        !            21: .UC 6
        !            22: .SH NAME
        !            23: sigreturn \- return from signal
        !            24: .SH SYNOPSIS
        !            25: .nf
        !            26: .B #include <signal.h>
        !            27: .PP
        !            28: .B struct      sigcontext {
        !            29: .B     int     sc_onstack;
        !            30: .B     int     sc_mask;
        !            31: .B     int     sc_sp;
        !            32: .B     int     sc_fp;
        !            33: .B     int     sc_ap;
        !            34: .B     int     sc_pc;
        !            35: .B     int     sc_ps;
        !            36: .B };
        !            37: .PP
        !            38: .B sigreturn(scp);
        !            39: .B struct sigcontext *scp;
        !            40: .SH DESCRIPTION
        !            41: .I Sigreturn
        !            42: allows users to atomically unmask, switch stacks,
        !            43: and return from a signal context.
        !            44: The processes signal mask and stack status are
        !            45: restored from the context.
        !            46: The system call does not return;
        !            47: the users stack pointer, frame pointer, argument pointer,
        !            48: and processor status longword are restored from the context.
        !            49: Execution resumes at the specified pc.
        !            50: This system call is used by the trampoline code, and
        !            51: .IR longjmp (3)
        !            52: when returning from a signal to the previously executing program.
        !            53: .SH NOTES
        !            54: This system call is not available in 4.2BSD,
        !            55: hence it should not be used if backward compatibility is needed.
        !            56: .SH "RETURN VALUE
        !            57: If successful, the system call does not return.
        !            58: Otherwise, a value of \-1 is returned and 
        !            59: .I errno
        !            60: is set to indicate the error.
        !            61: .SH ERRORS
        !            62: .I Sigreturn
        !            63: will fail and the process context will remain unchanged
        !            64: if one of the following occurs.
        !            65: .TP 15
        !            66: [EFAULT]
        !            67: .I Scp
        !            68: points to memory that is not a valid part of the process
        !            69: address space.
        !            70: .TP
        !            71: [EINVAL]
        !            72: The process status longword is invalid or would improperly
        !            73: raise the privilege level of the process.
        !            74: .SH "SEE ALSO"
        !            75: sigvec(2), setjmp(3)

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