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

1.1     ! root        1: .\" Copyright (c) 1985 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: .\"    @(#)sigreturn.2 6.2 (Berkeley) 6/30/85
        !             6: .\"
        !             7: .TH SIGRETURN 2 "June 30, 1985"
        !             8: .UC 6
        !             9: .SH NAME
        !            10: sigreturn \- return from signal
        !            11: .SH SYNOPSIS
        !            12: .nf
        !            13: .B #include <signal.h>
        !            14: .PP
        !            15: .B struct      sigcontext {
        !            16: .B     int     sc_onstack;
        !            17: .B     int     sc_mask;
        !            18: .B     int     sc_sp;
        !            19: .B     int     sc_fp;
        !            20: .B     int     sc_ap;
        !            21: .B     int     sc_pc;
        !            22: .B     int     sc_ps;
        !            23: .B };
        !            24: .PP
        !            25: .B sigreturn(scp);
        !            26: .B struct sigcontext *scp;
        !            27: .SH DESCRIPTION
        !            28: .I Sigreturn
        !            29: allows users to atomically unmask, switch stacks,
        !            30: and return from a signal context.
        !            31: The processes signal mask and stack status are
        !            32: restored from the context.
        !            33: The system call does not return;
        !            34: the users stack pointer, frame pointer, argument pointer,
        !            35: and processor status longword are restored from the context.
        !            36: Execution resumes at the specified pc.
        !            37: This system call is used by the trampoline code, and
        !            38: .IR longjmp (3)
        !            39: when returning from a signal to the previously executing program.
        !            40: .SH NOTES
        !            41: This system call is not available in 4.2BSD,
        !            42: hence it should not be used if backward compatibility is needed.
        !            43: .SH "RETURN VALUE
        !            44: If successful, the system call does not return.
        !            45: Otherwise, a value of \-1 is returned and 
        !            46: .I errno
        !            47: is set to indicate the error.
        !            48: .SH ERRORS
        !            49: .I Sigreturn
        !            50: will fail and the process context will remain unchanged
        !            51: if one of the following occurs.
        !            52: .TP 15
        !            53: [EFAULT]
        !            54: .I Scp
        !            55: points to memory that is not a valid part of the process
        !            56: address space.
        !            57: .TP
        !            58: [EINVAL]
        !            59: The process status longword is invalid or would improperly
        !            60: raise the privilege level of the process.
        !            61: .SH "SEE ALSO"
        !            62: sigvec(2), setjmp(3)

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