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    Command:

    siglongjmp

    
    
    

    SYNOPSIS

           #include <setjmp.h>
    
           void longjmp(jmp_buf env, int val);
    
           void siglongjmp(sigjmp_buf env, int val);
    
       Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
    
           siglongjmp(): _POSIX_C_SOURCE >= 1 || _XOPEN_SOURCE || _POSIX_C_SOURCE
    
    
    

    DESCRIPTION

           longjmp()  and  setjmp(3) are useful for dealing with errors and inter-
           rupts encountered in a low-level subroutine of  a  program.   longjmp()
           restores  the  environment saved by the last call of setjmp(3) with the
           corresponding env argument.  After longjmp() is completed, program exe-
           cution  continues  as  if  the corresponding call of setjmp(3) had just
           returned the value val.  longjmp() cannot cause 0 to be  returned.   If
           longjmp()  is  invoked  with a second argument of 0, 1 will be returned
           instead.
    
           siglongjmp() is similar to longjmp() except for the  type  of  its  env
           argument.   If,  and  only  if, the sigsetjmp(3) call that set this env
           used a nonzero savesigs flag, siglongjmp()  also  restores  the  signal
           mask that was saved by sigsetjmp(3).
    
    
    

    RETURN VALUE

           These functions never return.
    
    
    

    CONFORMING TO

           C89,  C99,  and POSIX.1-2001 specify longjmp().  POSIX.1-2001 specifies
           siglongjmp().
    
    
    

    NOTES

           POSIX does not specify whether longjmp() will restore the  signal  con-
           text  (see  setjmp(3)  for some more details).  If you want to portably
           save and restore signal masks, use sigsetjmp(3) and siglongjmp().
    
           The values of automatic variables  are  unspecified  after  a  call  to
           longjmp() if they meet all the following criteria:
    
           ?  they are local to the function that made the corresponding setjmp(3)
              call;
    
           ?  their  values  are  changed  between  the  calls  to  setjmp(3)  and
              longjmp(); and
    
           ?  they are not declared as volatile.
    
           Analogous remarks apply for siglongjmp().
    
           longjmp()  and  siglongjmp() make programs hard to understand and main-
    
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