diff --git a/libc/Makefile b/libc/Makefile
index 0008e95d..f3bf5348 100644
--- a/libc/Makefile
+++ b/libc/Makefile
@@ -494,6 +494,7 @@ unistd/fork.o \
unistd/fsync.o \
unistd/ftruncate.o \
unistd/getcwd.o \
+unistd/getdomainname.o \
unistd/getegid.o \
unistd/geteuid.o \
unistd/getgid.o \
diff --git a/libc/include/unistd.h b/libc/include/unistd.h
index 21a96b84..1ffc5666 100644
--- a/libc/include/unistd.h
+++ b/libc/include/unistd.h
@@ -354,6 +354,7 @@ int fsync(int);
int ftruncate(int, off_t);
char* getcwd(char*, size_t);
char* get_current_dir_name(void);
+int getdomainname(char*, size_t);
gid_t getegid(void);
uid_t geteuid(void);
int gethostname(char*, size_t);
diff --git a/libc/unistd/getdomainname.cpp b/libc/unistd/getdomainname.cpp
new file mode 100644
index 00000000..9d4effeb
--- /dev/null
+++ b/libc/unistd/getdomainname.cpp
@@ -0,0 +1,40 @@
+/*******************************************************************************
+
+ Copyright(C) Jonas 'Sortie' Termansen 2014.
+
+ This file is part of the Sortix C Library.
+
+ The Sortix C Library is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or (at your
+ option) any later version.
+
+ The Sortix C Library is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
+ License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with the Sortix C Library. If not, see .
+
+ unistd/getdomainname.cpp
+ Get the domainname.
+
+*******************************************************************************/
+
+#include
+#include
+#include
+#include
+
+extern "C" int getdomainname(char* name, size_t len)
+{
+ const char* domainname = getenv("DOMAINNAME");
+ if ( !domainname )
+ domainname = "localdomain";
+ size_t domainname_len = strlen(domainname);
+ if ( len < domainname_len+1 )
+ return errno = ENAMETOOLONG, -1;
+ strcpy(name, domainname);
+ return 0;
+}