Initial commit

kapitel17/unix-socket-server.c

@@ -0,0 +1,87 @@
+#define _XOPEN_SOURCE 700
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <string.h>
+#include <unistd.h>
+#include <signal.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <time.h>
+#define MAXLEN 32
+
+void cleanUp(int signum);
+const char sockname[] = "/tmp/tidssocket";
+int connfd;
+int datafd;
+
+int main(void)
+{
+    struct sockaddr_un addr;
+    char buffer[MAXLEN];
+    char recvbuffer[MAXLEN];
+    time_t current_time;
+    struct tm *local_time;
+
+    /* registrera signalhanterarna */
+    signal(SIGTERM, cleanUp);
+    signal(SIGABRT, cleanUp);
+    signal(SIGQUIT, cleanUp);
+    signal(SIGINT, cleanUp);
+
+    /* skapa en socket fildeskriptor */
+    connfd = socket(AF_UNIX, SOCK_STREAM, 0);
+    if ( connfd == -1 )
+    {
+        perror("Create socket failed");
+        return 1;
+    }
+    /* sätt adressfamiljen till UNIX-socket */
+    addr.sun_family = AF_UNIX;
+    strcpy(addr.sun_path, sockname);
+    /* knyt ihop namnet och adressen och casta 
+       sockaddr_un till sockaddr) */
+    if ( (bind(connfd, (const struct sockaddr*)&addr, 
+        sizeof(struct sockaddr_un))) == -1 )
+    {
+        perror("Binding socket failed");
+        return 1;
+    }
+    /* lyssna efter anslutningar */
+    if ( (listen(connfd, 20)) == -1 )
+    {
+        perror("Listen error");
+        return 1;
+    }
+
+    /* acceptera anslutningen, skapa en ny data-fildeskriptor,
+       och skicka tiden till klienten */
+    while(1)
+    {
+        datafd = accept(connfd, NULL, NULL);
+        if (datafd == -1 )
+        {
+            perror("Accept error");
+            return 1;
+        }
+        printf("Client connected, sending time\n");
+        current_time = time(NULL);
+        local_time = localtime(&current_time);
+        strcpy(buffer, asctime(local_time));
+        write(datafd, buffer, MAXLEN);
+        read(datafd, recvbuffer, MAXLEN);
+        printf("Client respons: %s\n", recvbuffer);
+        close(datafd); /* stäng datafd efter varje anrop */
+    }
+    return 0; /* fall i fall */
+}
+
+void cleanUp(int signum)
+{
+   printf("Quitting and cleaning up\n");
+   close(datafd);
+   close(connfd);
+   unlink(sockname);
+   exit(0);
+}