gdb, btrace: fix error diagnostics
When we improved error messages in
cd393cec3ab gdb, btrace: improve error messages
we cleared the original errno. When the error reason can not be explained
in a more detailed error message, and we fall back to the default error
message, it now gives Success as error.
Restore the original errno to fix that.
diff --git a/gdb/nat/linux-btrace.c b/gdb/nat/linux-btrace.c
index 50de241..f8352b6 100644
--- a/gdb/nat/linux-btrace.c
+++ b/gdb/nat/linux-btrace.c
@@ -422,7 +422,8 @@ cpu_supports_bts (void)
static void
diagnose_perf_event_open_fail ()
{
- switch (errno)
+ int orig_errno = errno;
+ switch (orig_errno)
{
case EPERM:
case EACCES:
@@ -443,7 +444,7 @@ diagnose_perf_event_open_fail ()
break;
}
- error (_("Failed to start recording: %s"), safe_strerror (errno));
+ error (_("Failed to start recording: %s"), safe_strerror (orig_errno));
}
/* Get the linux version of a btrace_target_info. */
