auto import from //depot/cupcake/@135843
diff --git a/libc/stdio/tmpfile.c b/libc/stdio/tmpfile.c
new file mode 100644
index 0000000..39f7e92
--- /dev/null
+++ b/libc/stdio/tmpfile.c
@@ -0,0 +1,81 @@
+/* $OpenBSD: tmpfile.c,v 1.10 2005/10/10 12:00:52 espie Exp $ */
+/*-
+ * Copyright (c) 1990, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Chris Torek.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <signal.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <paths.h>
+
+FILE *
+tmpfile(void)
+{
+ sigset_t set, oset;
+ FILE *fp;
+ int fd, sverrno;
+#define TRAILER "tmp.XXXXXXXXXX"
+ char buf[sizeof(_PATH_TMP) + sizeof(TRAILER)];
+
+ (void)memcpy(buf, _PATH_TMP, sizeof(_PATH_TMP) - 1);
+ (void)memcpy(buf + sizeof(_PATH_TMP) - 1, TRAILER, sizeof(TRAILER));
+
+ sigfillset(&set);
+ (void)sigprocmask(SIG_BLOCK, &set, &oset);
+
+ fd = mkstemp(buf);
+ if (fd != -1) {
+ mode_t u;
+
+ (void)unlink(buf);
+ u = umask(0);
+ (void)umask(u);
+ (void)fchmod(fd, 0666 & ~u);
+ }
+
+ (void)sigprocmask(SIG_SETMASK, &oset, NULL);
+
+ if (fd == -1)
+ return (NULL);
+
+ if ((fp = fdopen(fd, "w+")) == NULL) {
+ sverrno = errno;
+ (void)close(fd);
+ errno = sverrno;
+ return (NULL);
+ }
+ return (fp);
+}