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[07/12] osdep.h: Add header comment

Message ID 1437583451-9677-8-git-send-email-peter.maydell@linaro.org
State Accepted
Commit 03557b9abaee78e9d1ef5cd236d32a7b3e75e6f8
Headers show

Commit Message

Peter Maydell July 22, 2015, 4:44 p.m. UTC 
Add a header comment to osdep.h, explaining what the header is for
and some rules to avoid circular-include difficulties.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 include/qemu/osdep.h | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)
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Patch

diff --git a/include/qemu/osdep.h b/include/qemu/osdep.h
index 60ac27d..ab3c876 100644
--- a/include/qemu/osdep.h
+++ b/include/qemu/osdep.h
@@ -1,3 +1,27 @@ 
+/*
+ * OS includes and handling of OS dependencies
+ *
+ * This header exists to pull in some common system headers that
+ * most code in QEMU will want, and to fix up some possible issues with
+ * it (missing defines, Windows weirdness, and so on).
+ *
+ * To avoid getting into possible circular include dependencies, this
+ * file should not include any other QEMU headers, with the exceptions
+ * of config-host.h, compiler.h, os-posix.h and os-win32.h, all of which
+ * are doing a similar job to this file and are under similar constraints.
+ *
+ * This header also contains prototypes for functions defined in
+ * os-*.c and util/oslib-*.c; those would probably be better split
+ * out into separate header files.
+ *
+ * In an ideal world this header would contain only:
+ *  (1) things which everybody needs
+ *  (2) things without which code would work on most platforms but
+ *      fail to compile or misbehave on a minority of host OSes
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
 #ifndef QEMU_OSDEP_H
 #define QEMU_OSDEP_H