From cc59cc8557aa9b1fdb62261fade15d9ade9d11fb Mon Sep 17 00:00:00 2001
From: Stefan Zabka <zabkaste@hu-berlin.de>
Date: Sun, 24 May 2020 22:07:53 +0200
Subject: Can now kill running processes

---
 02_exercise/process.c |  1 +
 02_exercise/shell.c   | 28 ++++++++++++++++++++++++----
 2 files changed, 25 insertions(+), 4 deletions(-)

diff --git a/02_exercise/process.c b/02_exercise/process.c
index 95a0600..0b69074 100644
--- a/02_exercise/process.c
+++ b/02_exercise/process.c
@@ -7,6 +7,7 @@
 #include "array.h"
 #include "process.h"
 
+
 // given a substring of a line tries to parse out as much information as possible
 int parse_command(char const *line, char const *end, process *p) {
     char *part;
diff --git a/02_exercise/shell.c b/02_exercise/shell.c
index f4b6738..fc50995 100644
--- a/02_exercise/shell.c
+++ b/02_exercise/shell.c
@@ -12,10 +12,28 @@
 #include "builtins.h"
 
 
+process *processes ;
+
+void signal_handeler (int signal) {
+    printf("Received signal %d", signal);
+    if(signal == SIGINT) {
+        for(size_t i = 0; i < arrayLen(processes); ++i) {
+            pid_t pid = processes[i].pid;
+            if(pid != 0) {
+                kill(pid, SIGINT);
+            }
+        }
+    }
+}
+
 int main(void) {
     setvbuf(stderr, NULL, _IONBF, 0);
     setvbuf(stdout, NULL, _IONBF, 0);
-
+    // I don't think the shell should exit on SIG_TERM
+    if(signal(SIGINT, SIG_IGN)== SIG_ERR) {
+        perror("Couldn't ignore sigterm");
+        exit(errno);
+    }
 
     printf("Welcome! Available built-ins are:\n"
            "cd: `cd <path>` - if no path is given, return to the current dir\n"
@@ -47,14 +65,13 @@ int main(void) {
         }
         line[length - 1] = '\0'; // cut the line feed
 
-        process *processes = NULL;
+        processes = NULL;
         parse_line(line, &processes);
 
         if (strcmp(processes[0].argv[0], "cd") == 0) {
             if (arrayLen(processes) != 1) {
                 perror("Can't chain cd with other processes");
             }
-
             int ret;
             switch(arrayLen(processes[0].argv)) {
                 case 3:
@@ -81,12 +98,15 @@ int main(void) {
         } else if (strcmp(processes[0].argv[0], "wait") == 0) {
            builtin_wait(processes[0]);
         } else {
+            if(arrayLen(processes) != 0 && processes[0].blocking) {
+                signal(SIGINT, signal_handeler);
+            }
             for (size_t i = 0; i < arrayLen(processes); ++i) {
                 int ret = exec_command(processes[i]);
                 if (ret)
                     printf("[%i] ", ret);
             }
-
+            signal(SIGINT, SIG_IGN);
         }
 
         free((void *)line);
-- 
cgit v1.2.3-54-g00ecf