diff --git a/fastchat/serve/launch_all_serve.py b/fastchat/serve/launch_all_serve.py
index 2f4ad7b0b..f0a35d8ed 100644
--- a/fastchat/serve/launch_all_serve.py
+++ b/fastchat/serve/launch_all_serve.py
@@ -13,8 +13,10 @@
 
 sys.path.append(os.path.dirname(os.path.dirname(__file__)))
 
-import subprocess
 import re
+import runpy
+import shlex
+import time
 import argparse
 
 LOGDIR = "./logs/"
@@ -190,20 +192,41 @@
         )
     os.environ["CUDA_VISIBLE_DEVICES"] = args.gpus
 
-# 0,controller, model_worker, openai_api_server
-# 1, cmd options
-# 2,LOGDIR
-# 3, log file name
-base_launch_sh = "nohup python3 -m fastchat.serve.{0} {1} >{2}/{3}.log 2>&1 &"
+def launch_process(module, str_args, log_dir, log_name):
+    import sys
+    module_name = f"fastchat.serve.{module}"
+    argv = [module_name] + shlex.split(str_args)
+    log_path = os.path.join(log_dir, f"{log_name}.log")
+    # Double-fork: grandchild is fully detached (adopted by init)
+    pid = os.fork()
+    if pid == 0:
+        if os.fork() != 0:
+            os._exit(0)  # intermediate child exits; grandchild continues
+        log_fd = os.open(log_path, os.O_WRONLY | os.O_CREAT | os.O_APPEND, 0o644)
+        os.dup2(log_fd, 1)
+        os.dup2(log_fd, 2)
+        os.close(log_fd)
+        os.setsid()
+        sys.argv = argv
+        try:
+            runpy.run_module(module_name, run_name="__main__", alter_sys=True)
+        finally:
+            os._exit(0)
+    os.waitpid(pid, 0)  # reap intermediate child immediately
 
-# 0 LOGDIR
-#! 1 log file name
-# 2 controller, worker, openai_api_server
-base_check_sh = """while [ `grep -c "Uvicorn running on" {0}/{1}.log` -eq '0' ];do
-                        sleep 1s;
-                        echo "wait {2} running"
-                done
-                echo '{2} running' """
+
+def wait_for_service(log_dir, log_name, service_name):
+    log_path = os.path.join(log_dir, f"{log_name}.log")
+    while True:
+        try:
+            with open(log_path, "r") as f:
+                if "Uvicorn running on" in f.read():
+                    break
+        except FileNotFoundError:
+            pass
+        time.sleep(1)
+        print(f"wait {service_name} running")
+    print(f"{service_name} running")
 
 
 def string_args(args, args_list):
@@ -224,43 +247,33 @@ def string_args(args, args_list):
             or isinstance(value, tuple)
             or isinstance(value, set)
         ):
-            value = " ".join(value)
+            value = " ".join(shlex.quote(str(v)) for v in value)
             args_str += f" --{key} {value} "
         else:
-            args_str += f" --{key} {value} "
+            args_str += f" --{key} {shlex.quote(str(value))} "
 
     return args_str
 
 
 def launch_worker(item):
-    log_name = (
-        item.split("/")[-1]
-        .split("\\")[-1]
-        .replace("-", "_")
-        .replace("@", "_")
-        .replace(".", "_")
+    log_name = re.sub(
+        r"[^a-zA-Z0-9_]",
+        "_",
+        item.split("/")[-1].split("\\")[-1],
     )
 
     args.model_path, args.worker_host, args.worker_port = item.split("@")
     print("*" * 80)
     worker_str_args = string_args(args, worker_args)
     print(worker_str_args)
-    worker_sh = base_launch_sh.format(
-        "model_worker", worker_str_args, LOGDIR, f"worker_{log_name}"
-    )
-    worker_check_sh = base_check_sh.format(LOGDIR, f"worker_{log_name}", "model_worker")
-    subprocess.run(worker_sh, shell=True, check=True)
-    subprocess.run(worker_check_sh, shell=True, check=True)
+    launch_process("model_worker", worker_str_args, LOGDIR, f"worker_{log_name}")
+    wait_for_service(LOGDIR, f"worker_{log_name}", "model_worker")
 
 
 def launch_all():
     controller_str_args = string_args(args, controller_args)
-    controller_sh = base_launch_sh.format(
-        "controller", controller_str_args, LOGDIR, "controller"
-    )
-    controller_check_sh = base_check_sh.format(LOGDIR, "controller", "controller")
-    subprocess.run(controller_sh, shell=True, check=True)
-    subprocess.run(controller_check_sh, shell=True, check=True)
+    launch_process("controller", controller_str_args, LOGDIR, "controller")
+    wait_for_service(LOGDIR, "controller", "controller")
 
     if isinstance(args.model_path_address, str):
         launch_worker(args.model_path_address)
@@ -270,14 +283,8 @@ def launch_all():
             launch_worker(item)
 
     server_str_args = string_args(args, server_args)
-    server_sh = base_launch_sh.format(
-        "openai_api_server", server_str_args, LOGDIR, "openai_api_server"
-    )
-    server_check_sh = base_check_sh.format(
-        LOGDIR, "openai_api_server", "openai_api_server"
-    )
-    subprocess.run(server_sh, shell=True, check=True)
-    subprocess.run(server_check_sh, shell=True, check=True)
+    launch_process("openai_api_server", server_str_args, LOGDIR, "openai_api_server")
+    wait_for_service(LOGDIR, "openai_api_server", "openai_api_server")
 
 
 if __name__ == "__main__":