Change protocol to send Linux errno from daemon to library.

This changes the protocol so that the Linux errno (if available)
is sent back to the library.  Note that the errno is not yet
made available to callers, since it is not clear how best to
present this Linux-specific number.

1 files changed, 5 insertions, 4 deletions

diff --git a/daemon/proto.c b/daemon/proto.c
index 6fa243ff..628e86c1 100644
--- a/daemon/proto.c
+++ b/daemon/proto.c
@@ -179,7 +179,7 @@ main_loop (int _sock)
   }
 }
 
-static void send_error (const char *msg);
+static void send_error (int errnum, const char *msg);
 
 void
 reply_with_error (const char *fs, ...)
@@ -191,7 +191,7 @@ reply_with_error (const char *fs, ...)
   vsnprintf (err, sizeof err, fs, args);
   va_end (args);
 
-  send_error (err);
+  send_error (0, err);
 }
 
 void
@@ -207,11 +207,11 @@ reply_with_perror_errno (int err, const char *fs, ...)
 
   snprintf (buf2, sizeof buf2, "%s: %s", buf1, strerror (err));
 
-  send_error (buf2);
+  send_error (err, buf2);
 }
 
 static void
-send_error (const char *msg)
+send_error (int errnum, const char *msg)
 {
   XDR xdr;
   char buf[GUESTFS_ERROR_LEN + 200];
@@ -236,6 +236,7 @@ send_error (const char *msg)
     exit (EXIT_FAILURE);
   }
 
+  err.linux_errno = errnum;
   err.error_message = (char *) msg;
 
   if (!xdr_guestfs_message_error (&xdr, &err)) {