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Timeout the server socket connection

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Wait no more than 2 seconds for accepting the connection from the
device, since it blocks the event loop, preventing to react to SIGTERM
(Ctrl+C).
This commit is contained in:
Romain Vimont 2018-02-09 15:18:09 +01:00
parent 90a46b4c45
commit eb09fefd43
5 changed files with 12 additions and 12 deletions
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7
app/src/netutil.c
View file

@ -4,7 +4,7 @@
// contrary to SDLNet_TCP_Send and SDLNet_TCP_Recv, SDLNet_TCP_Accept is non-blocking
// so we need to block before calling it
TCPsocket server_socket_accept(TCPsocket server_socket) {
TCPsocket server_socket_accept(TCPsocket server_socket, Uint32 timeout_ms) {
SDLNet_SocketSet set = SDLNet_AllocSocketSet(1);
if (!set) {
SDL_LogCritical(SDL_LOG_CATEGORY_SYSTEM, "Could not allocate socket set");
@ -17,9 +17,8 @@ TCPsocket server_socket_accept(TCPsocket server_socket) {
return NULL;
}
// timeout is (2^32-1) milliseconds, this should be sufficient
if (SDLNet_CheckSockets(set, -1) != 1) {
SDL_LogError(SDL_LOG_CATEGORY_SYSTEM, "Could not check socket");
if (SDLNet_CheckSockets(set, timeout_ms) != 1) {
SDL_LogError(SDL_LOG_CATEGORY_SYSTEM, "No connection to accept");
SDLNet_FreeSocketSet(set);
return NULL;
}

2
app/src/netutil.h
View file

@ -4,6 +4,6 @@
#include <SDL2/SDL_net.h>
// blocking accept on the server socket
TCPsocket server_socket_accept(TCPsocket server_socket);
TCPsocket server_socket_accept(TCPsocket server_socket, Uint32 timeout_ms);
#endif

9
app/src/scrcpy.c
View file

@ -111,10 +111,11 @@ SDL_bool scrcpy(const char *serial, Uint16 local_port, Uint16 max_size, Uint32 b
goto finally_destroy_server;
}
// to reduce startup time, we could be tempted to init other stuff before blocking here
// but we should not block after SDL_Init since it handles the signals (Ctrl+C) in its
// event loop: blocking could lead to deadlock
TCPsocket device_socket = server_connect_to(&server, serial);
// SDL initialization replace the signal handler for SIGTERM, so Ctrl+C is
// managed by the event loop. This blocking call blocks the event loop, so
// timeout the connection not to block indefinitely in case of SIGTERM.
#define SERVER_CONNECT_TIMEOUT_MS 2000
TCPsocket device_socket = server_connect_to(&server, serial, SERVER_CONNECT_TIMEOUT_MS);
if (!device_socket) {
server_stop(&server, serial);
ret = SDL_FALSE;

4
app/src/server.c
View file

@ -98,9 +98,9 @@ SDL_bool server_start(struct server *server, const char *serial, Uint16 local_po
return SDL_TRUE;
}
TCPsocket server_connect_to(struct server *server, const char *serial) {
TCPsocket server_connect_to(struct server *server, const char *serial, Uint32 timeout_ms) {
SDL_assert(server->server_socket);
server->device_socket = server_socket_accept(server->server_socket);
server->device_socket = server_socket_accept(server->server_socket, timeout_ms);
// we don't need the server socket anymore
SDLNet_TCP_Close(server->server_socket);

2
app/src/server.h
View file

@ -26,7 +26,7 @@ SDL_bool server_start(struct server *server, const char *serial, Uint16 local_po
Uint16 max_size, Uint32 bit_rate);
// block until the communication with the server is established
TCPsocket server_connect_to(struct server *server, const char *serial);
TCPsocket server_connect_to(struct server *server, const char *serial, Uint32 timeout_ms);
// disconnect and kill the server process
void server_stop(struct server *server, const char *serial);