Originální popis anglicky:
setjmp, sigsetjmp - save stack context for non-local goto
Návod, kniha: Library functions
#include <setjmp.h>
int setjmp(jmp_buf env);
int sigsetjmp(sigjmp_buf env, int savesigs);
setjmp() and
longjmp() are useful for dealing with errors and
interrupts encountered in a low-level subroutine of a program.
setjmp()
saves the stack context/environment in
env for later use by
longjmp(). The stack context will be invalidated if the function which
called
setjmp() returns.
sigsetjmp() is similar to
setjmp(). If
savesigs is nonzero,
the set of blocked signals is saved in
env and will be restored if a
siglongjmp() is later performed with this
env.
setjmp() and
sigsetjmp() return 0 if returning directly, and
non-zero when returning from
longjmp() using the saved context.
POSIX, ISO 9899 (C99)
POSIX does not specify whether
setjmp will save the signal context. (In
SYSV it will not. In BSD4.3 it will, and there is a function
_setjmp
that will not.) If you want to save signal masks, use
sigsetjmp.
setjmp() and
sigsetjmp make programs hard to understand and
maintain. If possible an alternative should be used.
longjmp(3),
siglongjmp(3)
