kqueue timer

README.md

@@ -1,10 +1,33 @@
-# What the fuck is this
+# KQUEUE Utilization
 
 This is your lame attempt to understand how those Network Virtual Functions sofware works as well to sharpen your understanding on C++ and C programming language. 
 
 
 ## Hints
-- Compile using `g++` 
+
+- Compile using `g++`  for the file watcher
+
+To trace the function calls on FreeBSD based system use `truss()` instead of `strace`.
+
+The `kqueue_socket.c` is my attempt on create a socket watcher timer program using `kevent`.
+
+- ![KQUEUE NETBSD GUIDE](https://wiki.netbsd.org/tutorials/kqueue_tutorial/)
+
+```
+
+    struct kevent my_event;
+    struct kevent my_change;
+
+    EV_SET(&my_change, ...); // Initialize the kevent
+
+    for(;;){
+
+        ...;
+
+    }
+
+    
+```
 
 ## Goal 
 - Understand the difference between c++ and C

bin/test.txt

@@ -4,3 +4,11 @@ aaaaa
 aaaaa
 aaaaa
 aaaaa
+aaaaa
+aaaaa
+aaaaa
+aaaaa
+aaaaa
+aaaaa
+aaaaa
+aaaaa

kqueue_file_watch.cpp

@@ -40,7 +40,6 @@ int main(int argc, char **argv){
 
     struct epoll_event *events =NULL;
     
-    
     static task_list_t **tasks=NULL;
     // printf("%s\n", task_list_t);
     
@@ -64,7 +63,6 @@ int main(int argc, char **argv){
     }
 
     // fd = open(argv[1], O_RDONLY);
-
     // for (int i=1; i <= 2; i++){
     //     printf("YOUR FILES \n");
     //     printf("==> %s\n", argv[i]);

kqueue_socket.c

@@ -0,0 +1,86 @@
+#include <sys/event.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/time.h>
+
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <netdb.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdlib.h>
+
+struct inf_kevent {
+    uintptr_t ident;
+    short filter;
+    u_short flags;
+    u_int fflags;
+    int64_t data;
+    void *udata;
+    u_int64_t ext[4];
+};
+
+struct addrinfo *add;
+struct addrinfo hints;
+
+void inf_info(const char *s);
+
+int main(void) {
+    struct kevent event;
+    struct kevent change;
+    pid_t pid;
+    int kq, nev;
+
+    printf("\n");
+    printf("---------------------------------------\n");
+    printf("Stupid struct\n");
+    printf("---------------------------------------\n");
+    printf("\n");
+
+
+    if ((kq = kqueue()) == -1){
+        inf_info("kqueue()");
+    }
+
+    EV_SET(&change, 1, EVFILT_TIMER, EV_ADD | EV_ENABLE, 0, 2000, 0);
+
+    for (;;) {
+
+        nev = kevent(kq, &change, 1, &event, 1, NULL);
+
+        printf("--> kq %d\n", kq);
+        printf("--> pid %d\n", pid);
+
+        if (nev < 0){
+            inf_info("kevent()");
+        }
+
+        else if (nev > 0) {
+
+            if (event.flags & EV_ERROR) {
+                fprintf(stderr, "EV_ERROR...");
+                exit(EXIT_FAILURE);
+            }
+
+            if ((pid = fork()) < 0 ) {
+                fprintf(stderr, "EV_ERROR...");
+                exit(EXIT_FAILURE);
+            }
+
+            else if (pid == 0) {
+                if (execlp("date", "date", (char *)0) < 0)
+                    inf_info("execplp()");
+            }
+
+        }
+    }
+    close(kq);
+}
+
+void inf_info(const char *s)
+{
+    perror(s);
+    exit(EXIT_FAILURE);
+}
+