wg: only error on wg show if all interfaces fail

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/src/show.c b/src/show.c
index 415489b..b7f665c 100644
--- a/src/show.c
+++ b/src/show.c
@@ -14,6 +14,7 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
+#include <errno.h>
 #include <time.h>
 #include <netdb.h>
 
@@ -394,12 +395,13 @@ int show_main(int argc, char *argv[])
 			perror("Unable to list interfaces");
 			return 1;
 		}
+		ret = !!*interfaces;
 		interface = interfaces;
 		for (size_t len = 0; (len = strlen(interface)); interface += len + 1) {
 			struct wgdevice *device = NULL;
 
 			if (ipc_get_device(&device, interface) < 0) {
-				perror("Unable to access interface");
+				fprintf(stderr, "Unable to access interface %s: %s\n", interface, strerror(errno));
 				continue;
 			}
 			if (argc == 3) {
@@ -414,6 +416,7 @@ int show_main(int argc, char *argv[])
 					printf("\n");
 			}
 			free_wgdevice(device);
+			ret = 0;
 		}
 		free(interfaces);
 	} else if (!strcmp(argv[1], "interfaces")) {