diff --git a/Doc/lib/libos.tex b/Doc/lib/libos.tex
index c02d6a6e5dd6a1..ebc3c5c254bef0 100644
--- a/Doc/lib/libos.tex
+++ b/Doc/lib/libos.tex
@@ -144,6 +144,12 @@ \subsection{Process Parameters \label{os-procinfo}}
 Availability: \UNIX.
 \end{funcdesc}
 
+\begin{funcdesc}{getpgid}{pid}
+Return the process group id of the process with process id \var{pid}.
+If \var{pid} is 0, the process group id of the current process is
+returned. Availability: \UNIX.
+\end{funcdesc}
+
 \begin{funcdesc}{getpgrp}{}
 \index{process!group}
 Return the id of the current process group.
diff --git a/Mac/Include/pyconfig.h b/Mac/Include/pyconfig.h
index 2229df4f0e2908..38542d7a746ef4 100644
--- a/Mac/Include/pyconfig.h
+++ b/Mac/Include/pyconfig.h
@@ -451,6 +451,9 @@ OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 #define HAVE_GETPEERNAME
 #endif
 
+/* Define if you have the getpgid function.  */
+#undef HAVE_GETPGID
+
 /* Define if you have the getpgrp function.  */
 #undef HAVE_GETPGRP
 
diff --git a/Misc/NEWS b/Misc/NEWS
index 767c3a578fb242..383614f0593a15 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -114,7 +114,8 @@ Extension modules
   This will create a temporary in-memory bsddb that won't be
   written to disk.
 
-- posix.killpg and posix.mknod have been added where available.
+- posix.killpg, posix.mknod, and posix.getpgid have been added where
+  available.
 
 - The locale module now exposes the C library's gettext interface.
 
diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index 7e90fbc0b0f2a5..a7a7ddd3988c51 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -2117,6 +2117,25 @@ posix_getgroups(PyObject *self, PyObject *args)
 }
 #endif
 
+#ifdef HAVE_GETPGID
+static char posix_getpgid__doc__[] =
+"getpgid(pid) -> pgid\n\
+Call the system call getpgid().";
+
+static PyObject *
+posix_getpgid(PyObject *self, PyObject *args)
+{
+	int pid, pgid;
+	if (!PyArg_ParseTuple(args, "i:getpgid", &pid))
+		return NULL;
+	pgid = getpgid(pid);
+	if (pgid < 0)
+		return posix_error();
+	return PyInt_FromLong((long)pgid);
+}
+#endif /* HAVE_GETPGID */
+
+
 #ifdef HAVE_GETPGRP
 PyDoc_STRVAR(posix_getpgrp__doc__,
 "getpgrp() -> pgrp\n\
@@ -6406,6 +6425,9 @@ static PyMethodDef posix_methods[] = {
 #ifdef HAVE_SETGROUPS
 	{"setgroups",	posix_setgroups, METH_VARARGS, posix_setgroups__doc__},
 #endif /* HAVE_SETGROUPS */
+#ifdef HAVE_GETPGID
+	{"getpgid",	posix_getpgid, METH_VARARGS, posix_getpgid__doc__},
+#endif /* HAVE_GETPGID */
 #ifdef HAVE_SETPGRP
 	{"setpgrp",	posix_setpgrp, METH_VARARGS, posix_setpgrp__doc__},
 #endif /* HAVE_SETPGRP */
diff --git a/RISCOS/pyconfig.h b/RISCOS/pyconfig.h
index 12f8fc64976ba7..a8cc8c7eb7209e 100644
--- a/RISCOS/pyconfig.h
+++ b/RISCOS/pyconfig.h
@@ -404,6 +404,9 @@
 /* Define if you have the getpeername function.  */
 #undef HAVE_GETPEERNAME
 
+/* Define if you have the getpgid function.  */
+#undef HAVE_GETPGID
+
 /* Define if you have the getpgrp function.  */
 #undef HAVE_GETPGRP
 
diff --git a/configure b/configure
index 92bf5f6bc5b4db..d35b169a69ec70 100755
--- a/configure
+++ b/configure
@@ -11449,7 +11449,7 @@ echo "${ECHO_T}MACHDEP_OBJS" >&6
 
 for ac_func in alarm chown chroot clock confstr ctermid ctermid_r execv \
  fchdir flock fork fsync fdatasync fpathconf ftime ftruncate \
- gai_strerror getgroups getlogin getpeername getpid getpwent getwd \
+ gai_strerror getgroups getlogin getpeername getpgid getpid getpwent getwd \
  hstrerror inet_pton kill killpg link lstat mkfifo mknod mktime mremap \
  nice pathconf pause plock poll pthread_init \
  putenv readlink \
diff --git a/configure.in b/configure.in
index 88025bc78a3bbb..35b890d8513845 100644
--- a/configure.in
+++ b/configure.in
@@ -1621,7 +1621,7 @@ AC_MSG_RESULT(MACHDEP_OBJS)
 # checks for library functions
 AC_CHECK_FUNCS(alarm chown chroot clock confstr ctermid ctermid_r execv \
  fchdir flock fork fsync fdatasync fpathconf ftime ftruncate \
- gai_strerror getgroups getlogin getpeername getpid getpwent getwd \
+ gai_strerror getgroups getlogin getpeername getpgid getpid getpwent getwd \
  hstrerror inet_pton kill killpg link lstat mkfifo mknod mktime mremap \
  nice pathconf pause plock poll pthread_init \
  putenv readlink \
diff --git a/pyconfig.h.in b/pyconfig.h.in
index 87b79ae9b652eb..06069626873b50 100644
--- a/pyconfig.h.in
+++ b/pyconfig.h.in
@@ -176,6 +176,9 @@
 /* Define to 1 if you have the `getpeername' function. */
 #undef HAVE_GETPEERNAME
 
+/* Define to 1 if you have the `getpgid' function. */
+#undef HAVE_GETPGID
+
 /* Define to 1 if you have the `getpgrp' function. */
 #undef HAVE_GETPGRP