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sim-se, kern: Add flags parameter to unlinkat

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The unlinkat syscall expects a "third" flags parameter [1].

It is using it to implement a sort of rmdirat (in case the parameter
includes the AT_REMOVEDIR flag)

[1]: https://man7.org/linux/man-pages/man2/unlink.2.html

Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Change-Id: I38dd9268ae4de0f289abe779c4da03e969248065
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/51548
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
This commit is contained in:
Giacomo Travaglini
2021-10-13 13:28:46 +01:00
parent 65ef21a308
commit 54d48c0244
4 changed files with 49 additions and 5 deletions
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9
src/sim/syscall_emul.hh
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@@ -911,7 +911,8 @@ openFunc(SyscallDesc *desc, ThreadContext *tc,
/// Target unlinkat() handler.
template <class OS>
SyscallReturn
unlinkatFunc(SyscallDesc *desc, ThreadContext *tc, int dirfd, VPtr<> pathname)
unlinkatFunc(SyscallDesc *desc, ThreadContext *tc,
int dirfd, VPtr<> pathname, int flags)
{
std::string path;
if (!SETranslatingPortProxy(tc).tryReadString(path, pathname))
@@ -922,7 +923,11 @@ unlinkatFunc(SyscallDesc *desc, ThreadContext *tc, int dirfd, VPtr<> pathname)
return res;
}
return unlinkImpl(desc, tc, path);
if (flags & OS::TGT_AT_REMOVEDIR) {
return rmdirImpl(desc, tc, path);
} else {
return unlinkImpl(desc, tc, path);
}
}
/// Target facessat() handler