setjmp - phpMan

SETJMP(3)                      Library functions                     SETJMP(3)



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 encoun-
       tered in a low-level subroutine of  a  program.   setjmp()  saves  the  stack  con-
       text/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  return-
       ing from longjmp() using the saved context.

CONFORMING TO
       POSIX, ISO 9899 (C99)

NOTES
       POSIX  does  not  specify  whether setjmp will save the signal context. (In SYSV it
       will not. In BSD4.3 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)



                                  1997-03-02                         SETJMP(3)

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