cred: setting and getting ids

kernel-src/sys/syscalls/setresuid.c

@@ -0,0 +1,12 @@
+#include <kernel/abi.h>
+#include <kernel/syscalls.h>
+#include <kernel/cred.h>
+
+syscallret_t syscall_setresuid(context_t *, uid_t uid, uid_t euid, uid_t suid) {
+	syscallret_t ret;
+
+	ret.errno = cred_setuids(&_cpu()->thread->proc->cred, uid, euid, suid);
+	ret.ret = ret.errno ? -1 : 0;
+
+	return ret;
+}