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LONGJMP(3) Library functions LONGJMP(3)
longjmp, siglongjmp - non-local jump to a saved stack context
void longjmp(jmp_buf env, int val);
void siglongjmp(sigjmp_buf env, int val);
longjmp() and setjmp() are useful for dealing with errors and interrupts encountered in a
low-level subroutine of a program. longjmp() restores the environment saved by the last
call of setjmp() with the corresponding env argument. After longjmp() is completed, pro-
gram execution continues as if the corresponding call of setjmp() had just returned the
value val. longjmp() cannot cause 0 to be returned. If longjmp is invoked with a second
argument of 0, 1 will be returned instead.
siglongjmp() is similar to longjmp() except for the type of its env argument. If the
sigsetjmp() call that set this env used a nonzero savesigs flag, siglongjmp() also
restores the set of blocked signals.
These functions never return.
POSIX does not specify whether longjmp will restore the signal context. If you want to
save and restore signal masks, use siglongjmp.
longjmp() and siglongjmp() make programs hard to understand and maintain. If possible an
alternative should be used.
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