Arguments

 

file_spec

   The full file specification of a new image to be activated in the
   child process.
 

argv

   An array of pointers to null-terminated character strings.
   These strings constitute the argument list available to the new
   process. By convention, argv[0] must point to a string that is
   the same as the new process filename (or its last component).
   argv is terminated by a NULL pointer.
 

envp

   An array of strings that specifies the program's environment.
   Each string in envp has the following form:

   name = value

   The name can be one of the following names and the value is a
   null-terminated string to be associated with the name:

   o  HOME-Your login directory

   o  TERM-The type of terminal being used

   o  PATH-The default device and directory

   o  USER-The name of the user who initiated the process

   The last element in envp must be the NULL pointer.

   When the operating system executes the program, it places a copy
   of the current environment vector (envp) in the external variable
   environ.