execute

Makefile

@@ -17,3 +17,7 @@ run: run.c run.h
 
 util: util.c util.h
 	$(GCC) -c util.c
+
+clean:
+	rm chicken
+	rm *.o

README.md

@@ -1 +1,6 @@
-# chickenshell
+# chickenshell
+
+
+## Reference
+
+[https://github.com/danistefanovic/build-your-own-x#build-your-own-shell](https://github.com/danistefanovic/build-your-own-x#build-your-own-shell)

error.h

@@ -0,0 +1,5 @@
+
+
+enum ExitCodes {
+    FAIL_TO_FORK
+};

main.c

@@ -1,6 +1,4 @@
 
-
-
 int main(int argc, char** argv) {
     return 0;
 }

run.c

@@ -0,0 +1,37 @@
+#include "run.h"
+
+/* Fork and exec a command given in args taking input from in and sending 
+ * output to out. The arguments array must end in a NULL. 
+ *
+ * Returns true on success or 1 on failure.
+ */
+bool execute(FILE *in, FILE *out, char *args[]) {
+    int in_FD = fileno(in);
+    int out_FD = fileno(out);
+
+    int err = fork();
+
+    if (err == -1) {
+        return true;
+    }
+
+    if (err) {  // parent
+        return false;
+    } else {    // child
+        dup2(in_FD, 0);
+        dup2(out_FD, 1);
+
+        execvp(args[0], args);
+    }
+
+    return false;
+}
+
+int test_exec(void) {
+    char *arg[] = {"ls", "lah", 0};
+
+    execute(stdin, stdout, arg);
+
+    return 0;
+}
+

run.h

@@ -0,0 +1,13 @@
+#include <stdlib.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#include "error.h"
+
+/* Fork and exec a command given in args taking input from in and sending 
+ * output to out. The arguments array must end in a NULL. 
+ *
+ * Returns true on success or 1 on failure.
+ */
+bool execute(FILE* in, FILE* out, char *args[]);