Rework controler

Signed-off-by: Adrien Gallouët <adrien@gallouet.fr>

src/ctl.c

@@ -8,6 +8,26 @@
 #include <sys/stat.h>
 #include <sys/un.h>
 
+int
+ctl_reply(int fd, struct ctl_msg *res, struct ctl_msg *req)
+{
+    if ((send(fd, req, sizeof(struct ctl_msg), 0) == -1) ||
+        (recv(fd, res, sizeof(struct ctl_msg), 0) == -1))
+        return -1;
+
+    if (res->type != req->type || !res->reply) {
+        errno = EINTR;
+        return -1;
+    }
+
+    if (res->ret) {
+        errno = res->ret;
+        return -1;
+    }
+
+    return 0;
+}
+
 static int
 ctl_setsun(struct sockaddr_un *dst, const char *dir, const char *file)
 {