Arguments

 

env

   The environment buffer, which must be an array of integers long
   enough to hold the register context of the calling function.
   The type jmp_buf is defined in the <setjmp.h> header file. The
   contents of the general-purpose registers, including the program
   counter (PC), are stored in the buffer.
 

value

   Passed from longjmp to setjmp, and then becomes the subsequent
   return value of the setjmp call. If value is passed as 0, it is
   converted to 1.