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 po-
          sitive 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 pro-
          cess.  The parent process ID is the process ID of its crea-
          tor.

     RETURN VALUE
          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 pro-
                  cess.

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

     SEE ALSO
          exec(2), fork(2), gethostid(2N), intro(2), setpgrp(2), sig-
          nal(3).













     April, 1990                                                     1