syscalls: chroot getpeername getsockname socketpair

kernel-src/sys/syscalls/chroot.c

@@ -0,0 +1,44 @@
+#include <kernel/syscalls.h>
+#include <kernel/scheduler.h>
+#include <kernel/vfs.h>
+#include <kernel/alloc.h>
+#include <errno.h>
+
+syscallret_t syscall_chroot(context_t *, const char *upath) {
+	syscallret_t ret = {
+		.ret = -1
+	};
+
+	if (upath > (char *)USERSPACE_END) {
+		ret.errno = EFAULT;
+		return ret;
+	}
+
+	// TODO safe string ops
+	char *path = alloc(strlen(upath) + 1);
+	strcpy(path, upath);
+
+	vnode_t *ref = path[0] == '/' ? sched_getroot() : sched_getcwd();
+	vnode_t *new = NULL;
+
+	ret.errno = vfs_lookup(&new, ref, path, NULL, 0);
+	if (ret.errno)
+		goto cleanup;
+
+	if (new->type != V_TYPE_DIR) {
+		ret.errno = ENOTDIR;
+		goto cleanup;
+	}
+
+	sched_setroot(new);
+	ret.ret = 0;
+
+	cleanup:
+	if (new)
+		VOP_RELEASE(new);
+
+	free(path);
+	VOP_RELEASE(ref);
+
+	return ret;
+}