Copy server params

This is a preliminary step necessary to move the server to a separate
thread.

app/src/scrcpy.c

@@ -275,10 +275,6 @@ scrcpy(struct scrcpy_options *options) {
 
     atexit(SDL_Quit);
 
-    if (!server_init(&s->server)) {
-        return false;
-    }
-
     bool ret = false;
 
     bool server_started = false;
@@ -313,7 +309,12 @@ scrcpy(struct scrcpy_options *options) {
         .force_adb_forward = options->force_adb_forward,
         .power_off_on_close = options->power_off_on_close,
     };
-    if (!server_start(&s->server, &params)) {
+
+    if (!server_init(&s->server, &params)) {
+        return false;
+    }
+
+    if (!server_start(&s->server)) {
         goto end;
     }
 
@@ -338,7 +339,7 @@ scrcpy(struct scrcpy_options *options) {
     }
 
     if (options->display && options->control) {
-        if (!file_handler_init(&s->file_handler, s->server.serial,
+        if (!file_handler_init(&s->file_handler, options->serial,
                                options->push_target)) {
             goto end;
         }

app/src/server.c

@@ -62,6 +62,44 @@ get_server_path(void) {
     return server_path;
 }
 
+static void
+server_params_destroy(struct server_params *params) {
+    // The server stores a copy of the params provided by the user
+    free((char *) params->serial);
+    free((char *) params->crop);
+    free((char *) params->codec_options);
+    free((char *) params->encoder_name);
+}
+
+static bool
+server_params_copy(struct server_params *dst, const struct server_params *src) {
+    *dst = *src;
+
+    // The params reference user-allocated memory, so we must copy them to
+    // handle them from another thread
+
+#define COPY(FIELD) \
+    dst->FIELD = NULL; \
+    if (src->FIELD) { \
+        dst->FIELD = strdup(src->FIELD); \
+        if (!dst->FIELD) { \
+            goto error; \
+        } \
+    }
+
+    COPY(serial);
+    COPY(crop);
+    COPY(codec_options);
+    COPY(encoder_name);
+#undef COPY
+
+    return true;
+
+error:
+    server_params_destroy(dst);
+    return false;
+}
+
 static bool
 push_server(const char *serial) {
     char *server_path = get_server_path();
@@ -106,9 +144,10 @@ static bool
 disable_tunnel(struct server *server) {
     assert(server->tunnel_enabled);
 
+    const char *serial = server->params.serial;
     bool ok = server->tunnel_forward
-            ? disable_tunnel_forward(server->serial, server->local_port)
-            : disable_tunnel_reverse(server->serial);
+            ? disable_tunnel_forward(serial, server->local_port)
+            : disable_tunnel_reverse(serial);
 
     // Consider tunnel disabled even if the command failed
     server->tunnel_enabled = false;
@@ -125,9 +164,10 @@ listen_on_port(sc_socket socket, uint16_t port) {
 static bool
 enable_tunnel_reverse_any_port(struct server *server,
                                struct sc_port_range port_range) {
+    const char *serial = server->params.serial;
     uint16_t port = port_range.first;
     for (;;) {
-        if (!enable_tunnel_reverse(server->serial, port)) {
+        if (!enable_tunnel_reverse(serial, port)) {
             // the command itself failed, it will fail on any port
             return false;
         }
@@ -153,7 +193,7 @@ enable_tunnel_reverse_any_port(struct server *server,
         }
 
         // failure, disable tunnel and try another port
-        if (!disable_tunnel_reverse(server->serial)) {
+        if (!disable_tunnel_reverse(serial)) {
             LOGW("Could not remove reverse tunnel on port %" PRIu16, port);
         }
 
@@ -179,9 +219,11 @@ static bool
 enable_tunnel_forward_any_port(struct server *server,
                                struct sc_port_range port_range) {
     server->tunnel_forward = true;
+
+    const char *serial = server->params.serial;
     uint16_t port = port_range.first;
     for (;;) {
-        if (enable_tunnel_forward(server->serial, port)) {
+        if (enable_tunnel_forward(serial, port)) {
             // success
             server->local_port = port;
             server->tunnel_enabled = true;
@@ -244,6 +286,8 @@ log_level_to_server_string(enum sc_log_level level) {
 
 static sc_pid
 execute_server(struct server *server, const struct server_params *params) {
+    const char *serial = server->params.serial;
+
     char max_size_string[6];
     char bit_rate_string[11];
     char max_fps_string[6];
@@ -301,7 +345,7 @@ execute_server(struct server *server, const struct server_params *params) {
     //     Port: 5005
     // Then click on "Debug"
 #endif
-    return adb_execute(server->serial, cmd, ARRAY_LEN(cmd));
+    return adb_execute(serial, cmd, ARRAY_LEN(cmd));
 }
 
 static bool
@@ -344,8 +388,13 @@ connect_to_server(uint16_t port, uint32_t attempts, uint32_t delay) {
 }
 
 bool
-server_init(struct server *server) {
-    server->serial = NULL;
+server_init(struct server *server, const struct server_params *params) {
+    bool ok = server_params_copy(&server->params, params);
+    if (!ok) {
+        LOGE("Could not copy server params");
+        return false;
+    }
+
     server->process = SC_PROCESS_NONE;
 
     server->server_socket = SC_INVALID_SOCKET;
@@ -377,13 +426,8 @@ server_on_terminated(void *userdata) {
 }
 
 bool
-server_start(struct server *server, const struct server_params *params) {
-    if (params->serial) {
-        server->serial = strdup(params->serial);
-        if (!server->serial) {
-            return false;
-        }
-    }
+server_start(struct server *server) {
+    const struct server_params *params = &server->params;
 
     if (!push_server(params->serial)) {
         /* server->serial will be freed on server_destroy() */
@@ -582,5 +626,5 @@ server_destroy(struct server *server) {
             LOGW("Could not close control socket");
         }
     }
-    free(server->serial);
+    server_params_destroy(&server->params);
 }

app/src/server.h

@@ -40,7 +40,8 @@ struct server_params {
 };
 
 struct server {
-    char *serial;
+    // The internal allocated strings are copies owned by the server
+    struct server_params params;
 
     sc_pid process;
     // alive only between start() and stop()
@@ -54,13 +55,13 @@ struct server {
     bool tunnel_forward; // use "adb forward" instead of "adb reverse"
 };
 
-// init default values
+// init the server with the given params
 bool
-server_init(struct server *server);
+server_init(struct server *server, const struct server_params *params);
 
 // push, enable tunnel et start the server
 bool
-server_start(struct server *server, const struct server_params *params);
+server_start(struct server *server);
 
 // block until the communication with the server is established
 bool