### 36.6 Process, Group, and User IDs

pgid = getpgrp ()

  Return the process group id of the current process.

pid = getpid ()

  Return the process id of the current process.

  See also: getppid.

pid = getppid ()

  Return the process id of the parent process.

  See also: getpid.

euid = geteuid ()

  Return the effective user id of the current process.

  See also: getuid.

uid = getuid ()

  Return the real user id of the current process.

  See also: geteuid.

egid = getegid ()

  Return the effective group id of the current process.

  See also: getgid.

gid = getgid ()

  Return the real group id of the current process.

  See also: getegid.