[xen staging] libxl: preserve errno in libxl__xcinfo2xlinfo()

[patchbot@xxxxxxx]

commit abd324a24770a9a0deb669cbc917c270a297166e
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Tue Sep 9 08:17:28 2025 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Sep 9 08:17:28 2025 +0200

    libxl: preserve errno in libxl__xcinfo2xlinfo()
    
    Callers observing errors elsewhere may be confused by the ENOSYS that
    the Flask operation would yield on a Flask-disabled hypervisor.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Jason Andryuk <jason.andryuk@xxxxxxx>
    Acked-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
---
 tools/libs/light/libxl_domain.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/libs/light/libxl_domain.c b/tools/libs/light/libxl_domain.c
index dd2e5e9a19..5be47f687f 100644
--- a/tools/libs/light/libxl_domain.c
+++ b/tools/libs/light/libxl_domain.c
@@ -277,6 +277,7 @@ void libxl__xcinfo2xlinfo(libxl_ctx *ctx,
                           libxl_dominfo *xlinfo)
 {
     size_t size;
+    int saved_errno = errno;
 
     memcpy(&(xlinfo->uuid), xcinfo->handle, sizeof(xen_domain_handle_t));
     xlinfo->domid = xcinfo->domain;
@@ -284,6 +285,7 @@ void libxl__xcinfo2xlinfo(libxl_ctx *ctx,
     if (libxl_flask_sid_to_context(ctx, xlinfo->ssidref,
                                    &xlinfo->ssid_label, &size) < 0)
         xlinfo->ssid_label = NULL;
+    errno = saved_errno;
 
     xlinfo->dying      = !!(xcinfo->flags&XEN_DOMINF_dying);
     xlinfo->shutdown   = !!(xcinfo->flags&XEN_DOMINF_shutdown);
--
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