1 files changed, 39 insertions, 0 deletions
diff --git a/stdio/mktemp.c b/stdio/mktemp.c
new file mode 100644
index 0000000..fb72216
--- /dev/null
+++ b/stdio/mktemp.c
@@ -0,0 +1,39 @@
+/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
+│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :vi│
+╞══════════════════════════════════════════════════════════════════════════════╡
+│ Copyright 2020 Justine Alexandra Roberts Tunney                              │
+│                                                                              │
+│ Permission to use, copy, modify, and/or distribute this software for         │
+│ any purpose with or without fee is hereby granted, provided that the         │
+│ above copyright notice and this permission notice appear in all copies.      │
+│                                                                              │
+│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                │
+│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                │
+│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             │
+│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         │
+│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        │
+│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               │
+│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
+│ PERFORMANCE OF THIS SOFTWARE.                                                │
+╚─────────────────────────────────────────────────────────────────────────────*/
+#include "libc/calls/calls.h"
+#include "libc/stdio/temp.h"
+#include "libc/sysv/errfuns.h"
+
+/**
+ * Generates unique filename.
+ *
+ * This function is usually frowned upon, since it's been known to
+ * create nasty opportunities for race conditions. Our implementation
+ * reflects that; consider using mkostemps().
+ */
+char *mktemp(char *template) {
+  int fd;
+  if ((fd = mkostemps(template, 0, 0)) != -1) {
+    close(fd);
+    unlink(template);
+  } else {
+    template[0] = '\0';
+  }
+  return template;
+}