vchan-socket-proxy: Move perror() into connect_socket

errno is reset by subsequent system & library calls, so it may be
inaccurate by the time connect_socket returns.  Call perror immediately
after failing system calls to print the proper message.

Signed-off-by: Jason Andryuk <jandryuk@gmail.com>
Acked-by: Wei Liu <wl@xen.org>
Reviewed-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
Release-acked-by: Paul Durrant <paul@xen.org>

diff --git a/tools/libvchan/vchan-socket-proxy.c b/tools/libvchan/vchan-socket-proxy.c
index 4edc3a44f5a88e6dd8b765091cdc2e63a2dfb183..c6a83e47128f3f784c507680a54062c4b3958570 100644 (file)
--- a/tools/libvchan/vchan-socket-proxy.c
+++ b/tools/libvchan/vchan-socket-proxy.c
@@ -155,12 +155,15 @@ static int connect_socket(const char *path_or_fd) {
     }
 
     fd = socket(AF_UNIX, SOCK_STREAM, 0);
-    if (fd == -1)
+    if (fd == -1) {
+        perror("socket");
         return -1;
+    }
 
     addr.sun_family = AF_UNIX;
     strcpy(addr.sun_path, path_or_fd);
     if (connect(fd, (const struct sockaddr *)&addr, sizeof(addr)) == -1) {
+        perror("connect");
         close(fd);
         return -1;
     }
@@ -457,7 +460,7 @@ int main(int argc, char **argv)
                 input_fd = output_fd = connect_socket(socket_path);
             }
             if (input_fd == -1) {
-                perror("connect socket");
+                fprintf(stderr, "connect_socket failed\n");
                 return 1;
             }
             if (data_loop(ctrl, input_fd, output_fd) != 0)