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<title>setjmp(3) - Plan 9 from User Space</title>
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<tr><td width=20><td><b>SETJMP(3)</b><td align=right><b>SETJMP(3)</b>
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<p><font size=+1><b>NAME </b></font><br>
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setjmp, longjmp, notejmp &ndash; non-local goto<br>
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<p><font size=+1><b>SYNOPSIS </b></font><br>
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<tt><font size=+1>#include &lt;u.h&gt;<br>
#include &lt;libc.h&gt;
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<tt><font size=+1>int &nbsp;&nbsp;&nbsp;setjmp(jmp_buf env)
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<tt><font size=+1>void longjmp(jmp_buf env, int val)
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<tt><font size=+1>void notejmp(void *uregs, jmp_buf env, int val)<br>
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<p><font size=+1><b>DESCRIPTION </b></font><br>
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These routines are useful for dealing with errors and interrupts
encountered in a low-level subroutine of a program.
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<i>Setjmp</i> saves its stack environment in <i>env</i> for later use by <i>longjmp</i>.
It returns value 0.
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<i>Longjmp</i> restores the environment saved by the last call of <i>setjmp</i>.
It then causes execution to continue as if the call of <i>setjmp</i>
had just returned with value <i>val</i>. The invoker of <i>setjmp</i> must not
itself have returned in the interim. All accessible data have
values as of the time <i>longjmp</i> was called.
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<i>Notejmp</i> is the same as <i>longjmp</i> except that it is to be called
from within a note handler (see <a href="../man3/notify.html"><i>notify</i>(3)</a>). The <i>uregs</i> argument
should be the first argument passed to the note handler.
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<i>Setjmp</i> and <i>longjmp</i> can also be used to switch stacks.<br>
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<p><font size=+1><b>SOURCE </b></font><br>
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<tt><font size=+1>/usr/local/plan9/src/lib9/jmp.c<br>
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<p><font size=+1><b>SEE ALSO </b></font><br>
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<a href="../man3/notify.html"><i>notify</i>(3)</a><br>
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<p><font size=+1><b>BUGS </b></font><br>
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<i>Notejmp</i> cannot recover from an address trap or bus error (page
fault) on the 680x0 architectures.
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To avoid name conflicts with the underlying system, <i>setjmp</i>, <i>longjmp</i>,
<i>notejmp</i>, and <i>jmp_buf</i> are preprocessor macros defined as <i>p9setjmp</i>,
<i>p9longjmp</i>, <i>p9notejmp</i>, and <i>p9jmp_buf</i>; see <a href="../man3/intro.html"><i>intro</i>(3)</a>.
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<i>P9setjmp</i> is implemented as a preprocessor macro that calls <i>sigsetjmp</i>
(see Unix&#8217;s <i>setjmp</i>(3)).<br>
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