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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);

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

       sigsetjmp(): _POSIX_C_SOURCE || _XOPEN_SOURCE

DESCRIPTION

       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 savesigs is nonzero, the set of
       blocked signals is saved in env and will be restored if a siglongjmp(3)
       is later performed with this env.

RETURN VALUE

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

CONFORMING TO

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

NOTES

       POSIX  does  not specify whether setjmp() will save the signal context.
       (In System V it will not.  In 4.3BSD it will, and there is  a  function
       _setjmp  that  will  not.)   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

       longjmp(3), siglongjmp(3)

COLOPHON

       This  page  is  part of release 2.77 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

                                  2007-07-26                         SETJMP(3)