A/UX® Programmer's Reference Sections

setjrnp(3C) setjrnp(3C)
NAME
set jrnp, longjrnp - non-local goto
SYNOPSIS
finclude
int setjrnp (env)
jrnp _ buf env;
void longjrnp (env, val)
jrnp buf env;
int -val;
DESCRIPTION
These functions are useful for dealing with errors and interrupts
encountered in a low-level subroutine of a program.
set jrnp saves its stack environment in env for later use by
longjrnp. The environment type jrnp buf is defined in the
header file. -
RETURN VALUE
When set jrnp has been called by the calling process, returns O.
longjrnp restores the environment saved by the last call of
set jrnp with the corresponding env argument. After longjrnp
is completed, program execution continues as if the corresponding
call of set jrnp (which must not itself have returned in the interim)
had just returned the value val. longjrnp cannot cause
set jrnp to return the value O. If longjrnp is invoked with a
second argument of 0, set jrnp will return 1. All accessible data
have values as of the time longjrnp was called.
SEE ALSO
signal(3).
WARNINGS
longjrnp fails if it is called when env was never primed by a call
to set jrnp or when the last such call is in a function which has
since returned.
1
February, 1990
RevisionC