diff --git a/example/main.c b/example/main.c
index 0e2fcd05..983b1b5d 100644
--- a/example/main.c
+++ b/example/main.c
@@ -105,7 +105,7 @@ int main(int argc, char * argv[])
 {
     ff_init(argc, argv);
 
-    int sockfd = ff_socket(AF_INET, SOCK_STREAM, 0);
+    sockfd = ff_socket(AF_INET, SOCK_STREAM, 0);
     printf("sockfd:%d\n", sockfd);
     if (sockfd < 0)
         printf("ff_socket failed\n");
diff --git a/freebsd/kern/kern_descrip.c b/freebsd/kern/kern_descrip.c
index 6326867e..27d8ee6e 100644
--- a/freebsd/kern/kern_descrip.c
+++ b/freebsd/kern/kern_descrip.c
@@ -4122,12 +4122,12 @@ ff_fdisused(int fd)
  * the kernel's descriptor space
  */
 void
-ff_fdused_range(struct filedesc *fdp, int max)
+ff_fdused_range(int max)
 {
-   int i;
-
+   int i, result;
+   struct thread *td = curthread;
    for (i = 0; i < max; i++)
-       fdused(fdp, i);
+       fdalloc(td, 0, &result);
 }
 
 #endif
diff --git a/lib/ff_config.c b/lib/ff_config.c
index 4ac57bbe..53f6f0c9 100644
--- a/lib/ff_config.c
+++ b/lib/ff_config.c
@@ -285,6 +285,8 @@ ini_parse_handler(void* user, const char* section, const char* name,
             pconfig->freebsd.hz = atoi(value);
         } else if (strcmp(name, "physmem") == 0) {
             pconfig->freebsd.physmem = atol(value);
+        } else if (strcmp(name, "fd_reserve") == 0) {
+            pconfig->freebsd.fd_reserve = atoi(value);
         } else {
             return freebsd_conf_handler(pconfig, "boot", name, value);
         }
diff --git a/lib/ff_freebsd_init.c b/lib/ff_freebsd_init.c
index 7d9fd021..220d2abb 100644
--- a/lib/ff_freebsd_init.c
+++ b/lib/ff_freebsd_init.c
@@ -112,7 +112,7 @@ ff_freebsd_init(void)
     mutex_init();
     mi_startup();
     sx_init(&proctree_lock, "proctree");
-    ff_fdused_range(curthread->td_proc->p_fd, ff_global_cfg.freebsd.fd_reserve);
+    ff_fdused_range(ff_global_cfg.freebsd.fd_reserve);
 
     cur = ff_global_cfg.freebsd.sysctl;
     while (cur) {
diff --git a/lib/include/sys/filedesc.h b/lib/include/sys/filedesc.h
index db07bcef..96a0f613 100644
--- a/lib/include/sys/filedesc.h
+++ b/lib/include/sys/filedesc.h
@@ -30,7 +30,7 @@
 
 #include_next <sys/filedesc.h>
 
-void ff_fdused_range(struct filedesc *fdp, int max);
+void ff_fdused_range(int max);
 int ff_fdisused(int fd);
 
 #endif    /* _FSTACK_SYS_FILEDESC_H_ */