Fix ioctl signature

The signature of ioctl uses a signed int as second argument. This,
however, differs from the definition in Linux, glibc, and our own
implementation in Unikraft, which use an unsigned long. Since using
int has lead to all sorts of problems (e.g., overflow into sign bit),
this commit adopts unsigned long also for the musl imported
header.

Signed-off-by: Marc Rittinghaus <marc.rittinghaus@unikraft.io>
Reviewed-by: Andra Paraschiv <andra@unikraft.io>
Approved-by: Razvan Deaconescu <razvand@unikraft.io>
Tested-by: Unikraft CI <monkey@unikraft.io>
GitHub-Closes: #42

diff --git a/patches/0020-Use-ulong-in-ioctl.patch b/patches/0020-Use-ulong-in-ioctl.patch
new file mode 100644 (file)
index 0000000..5765944
--- /dev/null
+++ b/patches/0020-Use-ulong-in-ioctl.patch
@@ -0,0 +1,13 @@
+diff --git a/include/sys/ioctl.h b/include/sys/ioctl.h
+index a9a2346..fed6b30 100644
+--- a/include/sys/ioctl.h
++++ b/include/sys/ioctl.h
+@@ -112,7 +112,7 @@ extern "C" {
+ #define SIOCDEVPRIVATE     0x89F0
+ #define SIOCPROTOPRIVATE   0x89E0
+ 
+-int ioctl (int, int, ...);
++int ioctl (int, unsigned long, ...);
+ 
+ #ifdef __cplusplus
+ }