error coding

error.h

@@ -1,5 +1,11 @@
 
+#ifndef ERRORH 
+#define ERRORH 
 
 enum ExitCodes {
-    FAIL_TO_FORK
+    ER_SUCCESS,
+    ER_FAILURE,
+    ER_FAIL_TO_FORK
 };
+
+#endif

main.c

@@ -1,4 +1,8 @@
 
+#include "error.h"
+
 int main(int argc, char** argv) {
-    return 0;
+
+
+    return ER_SUCCESS;
 }

run.c

@@ -5,26 +5,26 @@
  *
  * Returns true on success or 1 on failure.
  */
-bool execute(FILE *in, FILE *out, char *args[]) {
+int 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;
+        return ER_FAIL_TO_FORK;
     }
 
     if (err) {  // parent
-        return false;
+        return ER_SUCCESS;
     } else {    // child
         dup2(in_FD, 0);
         dup2(out_FD, 1);
 
-        execvp(args[0], args);
+        err = execvp(args[0], args);
     }
 
-    return false;
+    return ER_SUCCESS;
 }
 
 int test_exec(void) {

run.h

@@ -5,9 +5,14 @@
 
 #include "error.h"
 
+#ifndef RUNH
+#define RUNH
+
 /* 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 execute(FILE* in, FILE* out, char *args[]);
+
+#endif

util.h

@@ -0,0 +1,7 @@
+
+#ifndef UTILH
+#define UTILH
+
+
+
+#endif