commit dd6763a6c677687ad06727af037ed9a7b018c773
author Elliott Hughes <enh@google.com> Thu Oct 04 16:35:13 2018 -0700
committer Elliott Hughes <enh@google.com> Thu Oct 04 16:35:13 2018 -0700
tree 51170c743639731a7e5a1a7540eb3f68870cb893
parent 9df26193c8adc43a7ac1ba807e70d0b0772712c0

Another round of documentation.

Bug: N/A
Test: N/A
Change-Id: I1b818fbb36ddd6d084dee56828290c2717a0c9b0

libc/include/bits/ioctl.h

diff --git a/libc/include/bits/ioctl.h b/libc/include/bits/ioctl.h
index 745bbf0..9ed1292 100644
--- a/libc/include/bits/ioctl.h
+++ b/libc/include/bits/ioctl.h
@@ -26,13 +26,20 @@
  * SUCH DAMAGE.
  */
 
-#ifndef _BITS_IOCTL_H_
-#define _BITS_IOCTL_H_
+#pragma once
+
+/**
+ * @file bits/ioctl.h
+ * @brief The ioctl() function.
+ */
 
 #include <sys/cdefs.h>
 
 __BEGIN_DECLS
 
+/**
+ * [ioctl(2)](http://man7.org/linux/man-pages/man2/ioctl.2.html) operates on device files.
+ */
 int ioctl(int __fd, int __request, ...);
 
 /*
@@ -57,5 +64,3 @@
 #endif
 
 __END_DECLS
-
-#endif