From e1520589de17d08c4bde37f1198f18d012a1f377 Mon Sep 17 00:00:00 2001
From: Niklas Halle <niklas@niklashalle.net>
Date: Sat, 6 Jun 2020 14:06:00 +0200
Subject: basic shell works - sometimes goes out of sync (running current
 command only after issueing the next)

---
 03_exercise/cli/client   | Bin 23056 -> 23640 bytes
 03_exercise/cli/client.c |  39 ++++++++++++++++++++++++++++++---------
 2 files changed, 30 insertions(+), 9 deletions(-)

(limited to '03_exercise/cli')

diff --git a/03_exercise/cli/client b/03_exercise/cli/client
index 53ba0d8..c57cade 100755
Binary files a/03_exercise/cli/client and b/03_exercise/cli/client differ
diff --git a/03_exercise/cli/client.c b/03_exercise/cli/client.c
index 527c67c..83b4dec 100644
--- a/03_exercise/cli/client.c
+++ b/03_exercise/cli/client.c
@@ -3,6 +3,8 @@
 #include <stdlib.h>
 
 #include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
@@ -10,7 +12,21 @@
 #define PORT 9000
 #define HOST "127.0.0.1"
 
-#define BUF_SIZE 1024
+#define BUF_SIZE 2048
+
+int cfd;
+
+/* Signal Handler for SIGINT */
+void sigintHandler(int sig_num) {
+    errno = 0;
+    if (fcntl(cfd, F_GETFD) != -1 || errno != EBADF) {
+        write(cfd, "exit\n", 6);
+        close(cfd);
+    }
+    printf("Terminating client\n");
+    fflush(stdout);
+    exit(-1);
+}
 
 static inline void die(const char *msg) {
     perror(msg);
@@ -23,8 +39,7 @@ int main() {
             .sin_port = htons(PORT),
             .sin_addr.s_addr = inet_addr(HOST)
     };
-    char buf[BUF_SIZE];
-    int  cfd;
+    char               buf[BUF_SIZE];
 
     if ((cfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
         die("Could not open socket");
@@ -36,8 +51,14 @@ int main() {
     size_t    cap   = 0;
     __ssize_t length;
 
+    if (read(cfd, buf, BUF_SIZE) < 0)
+        die("Could not receive message");
+
+    printf("%s\n$> ", buf);
+    memset(buf, 0, BUF_SIZE);
+
     while (1) {
-        printf("%s > ", HOST);
+        //printf("[C] awaiting command\n");
         if ((length = getline(&line, &cap, stdin)) < 0) {
             fprintf(stderr, "Failed to read from STDIN");
             fflush(stderr);
@@ -49,14 +70,14 @@ int main() {
             continue;
         }
 
-        line[length - 1] = '\0'; // cut the line feed
+        strncpy(buf, line, strlen(line) + 1);
 
-        strncpy(buf, line, strlen(line));
+        //printf("[C] pre send: \"%s\"\n", buf);
 
-        if (write(cfd, buf, BUF_SIZE) < 0)
+        if (write(cfd, buf, strlen(line)) < 0)
             die("Could not send message");
 
-        if (strcmp(line, "exit") == 0) {
+        if (strcmp(line, "exit\n") == 0) {
             free(line);
             line = NULL;
             break;
@@ -65,7 +86,7 @@ int main() {
         if (read(cfd, buf, BUF_SIZE) < 0)
             die("Could not receive message");
 
-        printf("%s\n", buf);
+        printf("%s$> ", buf);
         memset(buf, 0, BUF_SIZE);
         free(line);
         line = NULL;
-- 
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