libc: Add ioctl() syscall wrapper

libc/CMakeLists.txt

@@ -20,6 +20,7 @@ set(SOURCES
     src/sys/stat.cpp
     src/sys/mman.cpp
     src/sys/wait.cpp
+    src/sys/ioctl.cpp
 )
 
 if(${LUNA_ARCH} STREQUAL "x86_64")

libc/include/sys/ioctl.h

@@ -0,0 +1,18 @@
+/* sys/ioctl.h: IO device control. */
+
+#ifndef _SYS_IOCTL_H
+#define _SYS_IOCTL_H
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+    /* Perform an IO control operation on a device. */
+    int ioctl(int fd, int request, ...);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

libc/src/sys/ioctl.cpp

@@ -0,0 +1,22 @@
+#include <bits/errno-return.h>
+#include <stdarg.h>
+#include <sys/ioctl.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+
+extern "C"
+{
+    int ioctl(int fd, int request, ...)
+    {
+        va_list ap;
+        va_start(ap, request);
+
+        void* arg = va_arg(ap, void*);
+
+        long rc = syscall(SYS_ioctl, fd, request, arg);
+
+        va_end(ap);
+
+        __errno_return(rc, int);
+    }
+}