getpid(2)                                               getpid(2)



NAME
     getpid, getpgrp, getppid - get process,  process  group,  or
     parent process IDs

SYNOPSIS
     #include <sys/types.h>

     pid_t getpid()

     pid_t getpgrp()

     pid_t getppid()

DESCRIPTION
     getpid returns the process ID of the calling process.  Each
     active process in the system is uniquely identified by a
     positive integer.  The range of this integer is from 1 to
     the system-imposed limit, or PID_MAX.

     getpgrp returns the process group ID of the calling process.
     Each active process is a member of a process group that is
     identified by a positive integer.  This grouping permits the
     signaling of related processes.

     getppid returns the parent process ID of the calling
     process.  The parent process ID is the process ID of its
     creator.

STATUS MESSAGES AND VALUE
     The return values are:

     getpid
          Returns the process ID of the calling process.

     getpgrp
          Returns the process group ID of the calling process.

     getppid
          Returns the parent process ID of the calling process.

     These system calls are useful for generating uniquely named
     temporary files.

SEE ALSO
     exec(2), fork(2), gethostid(2N), intro(2), setpgrp(2),
     signal(3)









January 1992                                                    1