SETJMP Section: Library functions (3) Updated: March 2, 2025 Index   NAME setjmp, sigsetjmp - save stack context for non-local goto   SYNOPSIS #include <setjmp.h> int setjmp(jmp_buf env); int sigsetjmp(sigjmp_buf env, int savesigs);   DESCRIPTION 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.   RETURN VALUE setjmp() and sigsetjmp() return 0 if returning directly, and non-zero when returning from longjmp() using the saved context.   CONFORMING TO POSIX   NOTES POSIX does not specify whether setjmp will save the signal context. 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.   SEE ALSO   Index NAME SYNOPSIS DESCRIPTION RETURN VALUE CONFORMING TO NOTES SEE ALSO This document was created by using the manual pages. Time: 11:58:05 GMT, March 24, 2025