Rename 'uid' to 'scid'

A random identifier is generated to differentiate multiple running
scrcpy instances. Rename it from 'uid' to 'scid' (scrcpy id) not to
confuse it with Linux UID.

Fixes #3729 <https://github.com/Genymobile/scrcpy/issues/3729>
Refs 4315be1648

app/src/scrcpy.c

@@ -273,8 +273,9 @@ sc_server_on_disconnected(struct sc_server *server, void *userdata) {
     // event
 }
 
+// Generate a scrcpy id to differentiate multiple running scrcpy instances
 static uint32_t
-scrcpy_generate_uid() {
+scrcpy_generate_scid() {
     struct sc_rand rand;
     sc_rand_init(&rand);
     // Only use 31 bits to avoid issues with signed values on the Java-side
@@ -314,10 +315,10 @@ scrcpy(struct scrcpy_options *options) {
 
     struct sc_acksync *acksync = NULL;
 
-    uint32_t uid = scrcpy_generate_uid();
+    uint32_t scid = scrcpy_generate_scid();
 
     struct sc_server_params params = {
-        .uid = uid,
+        .scid = scid,
         .req_serial = options->serial,
         .select_usb = options->select_usb,
         .select_tcpip = options->select_tcpip,

app/src/server.c

@@ -213,7 +213,7 @@ execute_server(struct sc_server *server,
         cmd[count++] = p; \
     }
 
-    ADD_PARAM("uid=%08x", params->uid);
+    ADD_PARAM("scid=%08x", params->scid);
     ADD_PARAM("log_level=%s", log_level_to_server_string(params->log_level));
     ADD_PARAM("bit_rate=%" PRIu32, params->bit_rate);
 
@@ -787,7 +787,7 @@ run_server(void *data) {
     LOGD("Device serial: %s", serial);
 
     int r = asprintf(&server->device_socket_name, SC_SOCKET_NAME_PREFIX "%08x",
-                     params->uid);
+                     params->scid);
     if (r == -1) {
         LOG_OOM();
         goto error_connection_failed;

app/src/server.h

@@ -22,7 +22,7 @@ struct sc_server_info {
 };
 
 struct sc_server_params {
-    uint32_t uid;
+    uint32_t scid;
     const char *req_serial;
     enum sc_log_level log_level;
     enum sc_codec codec;