Kernel+LibC+LibCore: Implement `renameat(2)`

Now with the ability to specify different bases for the old and new
paths.

1 files changed, 7 insertions, 1 deletions

diff --git a/Userland/Libraries/LibC/stdio.cpp b/Userland/Libraries/LibC/stdio.cpp
index e73c64c856..ed34dd8101 100644
--- a/Userland/Libraries/LibC/stdio.cpp
+++ b/Userland/Libraries/LibC/stdio.cpp
@@ -1126,11 +1126,17 @@ int fclose(FILE* stream)
 // https://pubs.opengroup.org/onlinepubs/9699919799/functions/rename.html
 int rename(char const* oldpath, char const* newpath)
 {
+    return renameat(AT_FDCWD, oldpath, AT_FDCWD, newpath);
+}
+
+// https://pubs.opengroup.org/onlinepubs/9699919799/functions/renameat.html
+int renameat(int olddirfd, char const* oldpath, int newdirfd, char const* newpath)
+{
     if (!oldpath || !newpath) {
         errno = EFAULT;
         return -1;
     }
-    Syscall::SC_rename_params params { { oldpath, strlen(oldpath) }, { newpath, strlen(newpath) } };
+    Syscall::SC_rename_params params { olddirfd, { oldpath, strlen(oldpath) }, newdirfd, { newpath, strlen(newpath) } };
     int rc = syscall(SC_rename, &params);
     __RETURN_WITH_ERRNO(rc, rc, -1);
 }