.TH SETJMP 3 .CT 2 proc_man .SH NAME setjmp, longjmp \(mi non-local goto .SH SYNOPSIS .nf .B #include <setjmp.h> .PP .B setjmp(env) .B jmp_buf env; .PP .B longjmp(env, val) .B jmp_buf env; .fi .SH DESCRIPTION These routines are useful for dealing with errors and interrupts encountered in a low-level subroutine of a program. .PP .I Setjmp saves its stack environment in .I env for later use by .I longjmp. It returns value 0. .PP .I Longjmp restores the environment saved by the last call of .IR setjmp . It then causes execution to continue as if the call of .I setjmp had just returned with value .IR val . The invoker of .I setjmp must not itself have returned in the interim. All accessible data have values as of the time .I longjmp was called. .SH "SEE ALSO" .IR signal (2)