From 0ca663c8262b65ccee9a4e6abbafaef710f6b36f Mon Sep 17 00:00:00 2001
From: Klemens Morgenstern <klemens.morgenstern@gmx.net>
Date: Sun, 26 Jan 2025 21:49:25 +0800
Subject: [PATCH] Set ENOTSUP when PROC_PPID_ONLY is undefined

closes #452
---
 src/pid.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/pid.cpp b/src/pid.cpp
index 7fa5f822c..322405907 100644
--- libs/process/src/pid.cpp
+++ libs/process/src/pid.cpp
@@ -178,6 +178,8 @@ pid_type parent_pid(pid_type pid, error_code & ec)
 std::vector<pid_type> child_pids(pid_type pid, error_code & ec)
 {
     std::vector<pid_type> vec;
+#if defined(PROC_PPID_ONLY)
+
     vec.resize(proc_listpids(PROC_PPID_ONLY, (uint32_t)pid, nullptr, 0) / sizeof(pid_type));
     const auto sz = proc_listpids(PROC_PPID_ONLY, (uint32_t)pid, &vec[0], sizeof(pid_type) * vec.size());
     if (sz < 0)
@@ -186,6 +188,9 @@ std::vector<pid_type> child_pids(pid_type pid, error_code & ec)
         return {};
     }
     vec.resize(sz);
+#else
+    BOOST_PROCESS_V2_ASSIGN_EC(ec, ENOTSUP, system_category());
+#endif
     return vec;
 }