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SETJMP(3)			    Linux Programmer's Manual				SETJMP(3)

       setjmp, sigsetjmp - save stack context for nonlocal goto

       #include <setjmp.h>

       int setjmp(jmp_buf env);

       int sigsetjmp(sigjmp_buf env, int savesigs);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       setjmp(): see NOTES.
       sigsetjmp(): _POSIX_C_SOURCE >= 1 || _XOPEN_SOURCE || _POSIX_C_SOURCE

       setjmp() and longjmp(3) 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(3).  The stack context will be invalidated if the function which
       called setjmp() returns.

       sigsetjmp() is similar to setjmp().  If, and only if, savesigs is nonzero,  the	process's
       current	signal mask is saved in env and will be restored if a siglongjmp(3) is later per-
       formed with this env.

       setjmp() and sigsetjmp() return 0 if returning directly, and nonzero when  returning  from
       longjmp(3) or siglongjmp(3) using the saved context.

       C89, C99, and POSIX.1-2001 specify setjmp().  POSIX.1-2001 specifies sigsetjmp().

       POSIX  does  not  specify whether setjmp() will save the signal mask.  In System V it will
       not.  In 4.3BSD it will, and there is a function  _setjmp  that	will  not.   By  default,
       Linux/glibc  follows  the  System  V  behavior,	but  the  BSD behavior is provided if the
       _BSD_SOURCE feature test macro is defined  and  none  of  _POSIX_SOURCE,  _POSIX_C_SOURCE,

       If you want to portably save and restore signal masks, use sigsetjmp() and siglongjmp(3).

       setjmp()  and  sigsetjmp()  make programs hard to understand and maintain.  If possible an
       alternative should be used.

       longjmp(3), siglongjmp(3)

       This page is part of release 3.55 of the Linux man-pages project.  A  description  of  the
       project,     and    information	  about    reporting	bugs,	 can	be    found    at

					    2009-06-26					SETJMP(3)
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