chg: SOCKET: connections (@xianling1998)

client/src/uart/uart_posix.c

@@ -48,6 +48,8 @@
 #include <fcntl.h>
 #include <netinet/tcp.h>
 #include <netdb.h>
+#include "sys/socket.h"
+#include "sys/un.h"
 
 #include "comms.h"
 
@@ -156,6 +158,51 @@ serial_port uart_open(const char *pcPortName, uint32_t speed) {
         return sp;
     }
 
+    // The socket for abstract namespace implement.
+    // Is local socket buffer, not a TCP or any net connection!
+    // so, you can't connect with address like: 127.0.0.1, or any IP
+    // see http://man7.org/linux/man-pages/man7/unix.7.html
+    if (memcmp(pcPortName, "socket:", 7) == 0) {
+        if (strlen(pcPortName) <= 7) {
+            free(sp);
+            return INVALID_SERIAL_PORT;
+        }
+
+        // we must use max timeout!
+        timeout.tv_usec = UART_TCP_CLIENT_RX_TIMEOUT_MS * 1000;
+
+        size_t servernameLen = (strlen(pcPortName) - 7) + 1;
+        char serverNameBuf[servernameLen];
+        memset(serverNameBuf, '\0', servernameLen);
+        for (int i = 7, j = 0; j < servernameLen; ++i, ++j) {
+            serverNameBuf[j] = pcPortName[i];
+        }
+        serverNameBuf[servernameLen - 1] = '\0';
+
+        int localsocket, len;
+        struct sockaddr_un remote;
+
+        remote.sun_path[0] = '\0';  // abstract namespace
+        strcpy(remote.sun_path + 1, serverNameBuf);
+        remote.sun_family = AF_LOCAL;
+        int nameLen = strlen(serverNameBuf);
+        len = 1 + nameLen + offsetof(struct sockaddr_un, sun_path);
+
+        if ((localsocket = socket(PF_LOCAL, SOCK_STREAM, 0)) == -1) {
+            free(sp);
+            return INVALID_SERIAL_PORT;
+        }
+
+        if (connect(localsocket, (struct sockaddr *) &remote, len) == -1) {
+            free(sp);
+            return INVALID_SERIAL_PORT;
+        }
+
+        sp->fd = localsocket;
+
+        return sp;
+    }
+
     sp->fd = open(pcPortName, O_RDWR | O_NOCTTY | O_NDELAY | O_NONBLOCK);
     if (sp->fd == -1) {
         uart_close(sp);