user: implement mlibc as the libc, finally.

It's finally done..

Signed-off-by: kaguya <vpshinomiya@protonmail.com>

user/include/mlibc/options/linux/generic/ifaddrs.cpp

@@ -0,0 +1,22 @@
+#include <mlibc/allocator.hpp>
+#include <mlibc/linux-sysdeps.hpp>
+#include <ifaddrs.h>
+#include <errno.h>
+
+int getifaddrs(struct ifaddrs **ifap) {
+	auto sysdep = MLIBC_CHECK_OR_ENOSYS(mlibc::sys_getifaddrs, -1);
+	if(int e = sysdep(ifap); e) {
+		errno = e;
+		return -1;
+	}
+
+	return 0;
+}
+
+void freeifaddrs(struct ifaddrs *ifa) {
+	while (ifa != nullptr) {
+		ifaddrs *current = ifa;
+		ifa = ifa->ifa_next;
+		getAllocator().free(current);
+	}
+}