commit 1808da8f97ea7e7ddc35433cb5411317a49aceaa
author Gabe Black <gabe.black@gmail.com> Tue Dec 07 03:38:24 2021 -0800
committer Gabe Black <gabe.black@gmail.com> Tue Dec 07 22:58:40 2021 +0000
tree d9d50b2f43d77c1ed1d86f405d0ce9ecc7284e6b
parent 954357d1ff1588bdb59c03ce9349c0c7939c06f1

sim-se: Handle empty paths when resolving an "at" path.

When the "path" argument is empty, use the file name of the node
referred to by the fd file descriptor. This matches the behavior of
"at" system calls when the TGT_AT_EMPTY_PATH flag is set. The system
calls themselves are responsible for checking for that flag, and
returning an error if an empty "path" is not allowed.

Change-Id: Ib48d91ff983b3edb6f65e83686b90d79d74f3471
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/53683
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Maintainer: Giacomo Travaglini <giacomo.travaglini@arm.com>
Tested-by: kokoro <noreply+kokoro@google.com>

src/sim/syscall_emul.hh

diff --git a/src/sim/syscall_emul.hh b/src/sim/syscall_emul.hh
index c53175b..2f49f5e 100644
--- a/src/sim/syscall_emul.hh
+++ b/src/sim/syscall_emul.hh
@@ -367,7 +367,10 @@
         if (!ffdp)
             return -EBADF;
 
-        path = ffdp->getFileName() + "/" + path;
+        if (path.empty())
+            path = ffdp->getFileName();
+        else
+            path = ffdp->getFileName() + "/" + path;
     }
 
     return 0;