* 0 is returned if either there's no pidfile, it's empty
* or no pid can be read.
*/
-pid_t read_pid (char *pidfile);
+extern pid_t read_pid (const char *pidfile);
/* check_pid
*
* table (using /proc) to determine if the process already exists. If
* so 1 is returned, otherwise 0.
*/
-pid_t check_pid (char *pidfile);
+extern pid_t check_pid (const char *pidfile);
/* write_pid
*
* Writes the pid to the specified file. If that fails 0 is
* returned, otherwise the pid.
*/
-pid_t write_pid (char *pidfile);
+extern pid_t write_pid (const char *pidfile);
/* remove_pid
*
* Remove the the specified file. The result from unlink(2)
* is returned
*/
-int remove_pid (char *pidfile);
+extern int remove_pid (const char *pidfile);
#endif