Squelch a warning on non-macOS builds.

Have a stub version of check_setif_failure(), declaring the first
argument as unused, on OSes other than macOS.

diff --git a/pcap-bpf.c b/pcap-bpf.c
index 464db9a73ee9da227f51f8494d9948aca5be61ec..02ebd70538dee711ad7b3189a2ad65b097d7fb60 100644 (file)
--- a/pcap-bpf.c
+++ b/pcap-bpf.c
@@ -1643,19 +1643,17 @@ pcap_cleanup_bpf(pcap_t *p)
        pcap_cleanup_live_common(p);
 }
 
+#ifdef __APPLE__
 static int
 check_setif_failure(pcap_t *p, int error)
 {
-#ifdef __APPLE__
        int fd;
        int err;
-#endif
 
        if (error == PCAP_ERROR_NO_SUCH_DEVICE) {
                /*
                 * No such device exists.
                 */
-#ifdef __APPLE__
                if (p->opt.rfmon && strncmp(p->opt.device, "wlt", 3) == 0) {
                        /*
                         * Monitor mode was requested, and we're trying
@@ -1713,7 +1711,7 @@ check_setif_failure(pcap_t *p, int error)
                        }
                        return (err);
                }
-#endif
+
                /*
                 * No such device.
                 */
@@ -1726,6 +1724,17 @@ check_setif_failure(pcap_t *p, int error)
         */
        return (error);
 }
+#else
+static int
+check_setif_failure(pcap_t *p _U_, int error)
+{
+       /*
+        * Just return the error status; it's what we want, and, if it's
+        * PCAP_ERROR, the error string has been filled in.
+        */
+       return (error);
+}
+#endif
 
 /*
  * Default capture buffer size.