diff --git a/libc/Makefile b/libc/Makefile
index 5b8e02b4..02a5b458 100644
--- a/libc/Makefile
+++ b/libc/Makefile
@@ -325,6 +325,7 @@ sys/socket/socketpair.o \
system.o \
tfork.o \
time.o \
+tmpfile.o \
truncateat.o \
truncate.o \
ttyname.o \
diff --git a/libc/include/stdio.h b/libc/include/stdio.h
index 871586d4..d1a4b86a 100644
--- a/libc/include/stdio.h
+++ b/libc/include/stdio.h
@@ -117,6 +117,7 @@ extern int sortix_puts(const char* str);
extern int sprintf(char* restrict s, const char* restrict format, ...);
extern int scanf(const char* restrict format, ...);
extern int sscanf(const char* restrict s, const char* restrict format, ...);
+extern FILE* tmpfile(void);
extern int ungetc(int c, FILE* stream);
extern int vfprintf(FILE* restrict stream, const char* restrict format, __gnuc_va_list ap);
extern int vfscanf(FILE* restrict stream, const char* restrict format, __gnuc_va_list arg);
@@ -131,7 +132,6 @@ extern int vsscanf(const char* restrict s, const char* restrict format, __gnuc_v
extern char* ctermid(char* s);
extern FILE *fmemopen(void* restrict buf, size_t size, const char* restrict mode);
extern FILE* open_memstream(char** bufp, size_t* sizep);
-extern FILE* tmpfile(void);
extern int dprintf(int fildes, const char* restrict format, ...);
extern int fgetpos(FILE* restrict stream, fpos_t* restrict pos);
extern int fsetpos(FILE* stream, const fpos_t* pos);
diff --git a/libc/tmpfile.cpp b/libc/tmpfile.cpp
new file mode 100644
index 00000000..749e7d49
--- /dev/null
+++ b/libc/tmpfile.cpp
@@ -0,0 +1,39 @@
+/*******************************************************************************
+
+ Copyright(C) Jonas 'Sortie' Termansen 2013.
+
+ 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 .
+
+ tmpfile.cpp
+ Opens an unnamed temporary file.
+
+*******************************************************************************/
+
+#include
+
+#include
+#include
+
+extern "C" FILE* tmpfile()
+{
+ char name[5 + sizeof(pid_t) * 3];
+ snprintf(name, sizeof(name), "/tmp/%ju", (uintmax_t) getpid());
+ FILE* ret = fopen(name, "w+");
+ if ( !ret )
+ return NULL;
+ unlink(name);
+ return ret;
+}