_FILE_OFFSET_BITS=64 support for fcntl.
On Android, fcntl is always implemented by fcntl64(2). This means that
an LP32 binary can `fcntl(F_SETLK, struct flock)` (because fcntl64(2)
passes through to the 32-bit fcntl(2) to handle F_SETLK), and it can
also `fcntl(F_SETLK64, struct flock64)`. What it can't do before this
patch is set _FILE_OFFSET_BITS=64 and then `fcntl(F_SETLK, struct
flock)` where that `struct flock` is actually implicitly `struct
flock64`.
Move the kernel uapi structs out of the way, define them ourselves based
on __LP64__ and _FILE_OFFSET_BITS, and fix up the relevant F_ constants.
(Also add a .clang-format to turn off clang-format in libc/include/.)
Bug: N/A
Test: treehugger (and strace!)
Change-Id: Iccd6c83d9133e1efcf93a7b49a6ae0f1bbd3d58b
diff --git a/libc/kernel/tools/defaults.py b/libc/kernel/tools/defaults.py
index 967d0c7..463de12 100644
--- a/libc/kernel/tools/defaults.py
+++ b/libc/kernel/tools/defaults.py
@@ -90,6 +90,8 @@
kernel_struct_replacements = set(
[
"epoll_event",
+ "flock",
+ "flock64",
"in_addr",
"ip_mreq_source",
"ip_msfilter",