table of contents
NAME¶
longjmp, siglongjmp - non-local jump to a saved stack context
SYNOPSIS¶
#include <setjmp.h>
void longjmp(jmp_buf env, int val); void siglongjmp(sigjmp_buf env, int val);
DESCRIPTION¶
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, program execution continues as if the corresponding call of setjmp() the sigsetjmp() call that set this env used a nonzero savesigs flag, siglongjmp() also restores the set of blocked signals.
RETURN VALUE¶
These functions never return.
CONFORMING TO¶
POSIX
NOTES¶
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.