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Annotation of 43BSDTahoe/man/man3/setjmp.3, revision 1.1

1.1     ! root        1: .\" Copyright (c) 1980 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: .\"    @(#)setjmp.3    6.2 (Berkeley) 1/9/86
        !             6: .\"
        !             7: .TH SETJMP 3 "January 9, 1986"
        !             8: .UC 4
        !             9: .SH NAME
        !            10: setjmp, longjmp \- non-local goto
        !            11: .SH SYNOPSIS
        !            12: .nf
        !            13: .B #include <setjmp.h>
        !            14: .PP
        !            15: .B setjmp(env)
        !            16: .B jmp_buf env;
        !            17: .PP
        !            18: .B longjmp(env, val)
        !            19: .B jmp_buf env;
        !            20: .PP
        !            21: .B _setjmp(env)
        !            22: .B jmp_buf env;
        !            23: .PP
        !            24: .B _longjmp(env, val)
        !            25: .B jmp_buf env;
        !            26: .fi
        !            27: .SH DESCRIPTION
        !            28: These routines are useful for dealing with errors 
        !            29: and interrupts encountered in
        !            30: a low-level subroutine of a program.
        !            31: .PP
        !            32: .I Setjmp 
        !            33: saves its stack environment in
        !            34: .I env
        !            35: for later use by
        !            36: .I longjmp.
        !            37: It returns value 0.
        !            38: .PP
        !            39: .I Longjmp
        !            40: restores the environment saved by the last call of
        !            41: .IR setjmp .
        !            42: It then returns in such a way that execution
        !            43: continues as if the call of 
        !            44: .I setjmp
        !            45: had just returned the value
        !            46: .I val
        !            47: to the function that invoked
        !            48: .I setjmp,
        !            49: which must not itself have returned in the interim.
        !            50: All accessible data have values as of the time
        !            51: .I longjmp
        !            52: was called.
        !            53: .PP
        !            54: .I Setjmp
        !            55: and
        !            56: .I longjmp
        !            57: save and restore the signal mask
        !            58: .IR sigmask (2),
        !            59: while
        !            60: .I _setjmp
        !            61: and
        !            62: .I _longjmp
        !            63: manipulate only the C stack and registers.
        !            64: .SH ERRORS
        !            65: .PP
        !            66: If the contents of the
        !            67: .B jmp_buf
        !            68: are corrupted, or correspond to an environment that has already returned,
        !            69: .I longjmp
        !            70: calls the routine 
        !            71: .IR longjmperror .
        !            72: If
        !            73: .I longjmperror
        !            74: returns the program is aborted.
        !            75: The default version of 
        !            76: .I longjmperror
        !            77: prints the message ``longjmp botch'' to standard error and returns.
        !            78: User programs wishing to exit more gracefully can write their own
        !            79: versions of 
        !            80: .IR longjmperror .
        !            81: .SH "SEE ALSO"
        !            82: sigvec(2), sigstack(2), signal(3)

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