term% cat index.txt SETJMP(3) Library Functions Manual SETJMP(3)
NAME
setjmp, longjmp - non-local goto
SYNOPSIS
#include <setjmp.h>
setjmp(env)
jmp_buf env;
longjmp(env, val)
jmp_buf env;
DESCRIPTION
These routines are useful for dealing with errors and interrupts en‐
countered in a low-level subroutine of a program.
Setjmp saves its stack environment in env for later use by longjmp. It
returns value 0.
Longjmp restores the environment saved by the last call of setjmp. It
then returns in such a way that execution continues as if the call of
setjmp had just returned the value val to the function that invoked
setjmp, which must not itself have returned in the interim. All acces‐
sible data have values as of the time longjmp was called.
SEE ALSO
signal(2)
SETJMP(3)