longjmp, siglongjmp − nonlocal jump to a saved stack context #include<setjmp.h> , int void longjmp(jmp_buf env , int void siglongjmp(sigjmp_buf env Feature Test Macro Requirements for glibc (see _POSIX_C_SOURCE >= 1 || _XOPEN_SOURCE || _POSIX_C_SOURCE and are useful for dealing with errors and interrupts encountered in a low‐level subroutine of a program. restores the environment saved by the last call of with the corresponding env argument. After is completed, program execution continues as if the corresponding call of had just returned the value cannot cause 0 to be returned. If is invoked with a second argument of 0, 1 will be returned instead. is similar to except for the type of its env argument. If, and only if, the call that set this env used a nonzero savesigs flag, also restores the signal mask that was saved by These functions never return. For an explanation of the terms used in this section, see ┌────────────────────────┬───────────────┬─────────┐ │Interface │ Attribute │ Value │ ├────────────────────────┼───────────────┼─────────┤ │ │ Thread safety │ MT‐Safe │ └────────────────────────┴───────────────┴─────────┘ POSIX.1‐2001, POSIX.1‐2008, C89, C99. POSIX.1‐2001, POSIX.1‐2008. POSIX does not specify whether will restore the signal context (see for some more details). If you want to portably save and restore signal masks, use and The values of automatic variables are unspecified after a call to if they meet all the following criteria: • they are local to the function that made the corresponding call; • their values are changed between the calls to and and • they are not declared as Analogous remarks apply for and make programs hard to understand and maintain. If possible, an alternative should be used. ‐2‐ This page is part of release 4.04 of the Linux man‐pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at http://www.kernel.org/doc/man−pages/.