diff --git a/Rewrite-unix-fork-reopen-to-be-compatible-with-ruby-.patch b/Rewrite-unix-fork-reopen-to-be-compatible-with-ruby-.patch
new file mode 100644
index 0000000000000000000000000000000000000000..e3df35a7948a45cab00abeb3bed54adba3461361
--- /dev/null
+++ b/Rewrite-unix-fork-reopen-to-be-compatible-with-ruby-.patch
@@ -0,0 +1,52 @@
+From 975e87883a4f65966df59a5e757f03b66dd7e571 Mon Sep 17 00:00:00 2001
+From: Hans de Graaff <hans@degraaff.org>
+Date: Mon, 29 Apr 2019 18:41:35 +0200
+Subject: [PATCH] Rewrite unix fork reopen to be compatible with ruby 2.6
+
+On ruby 2.6 the original code would fail specs:
+
+lib/childprocess/unix/fork_exec_process.rb:32:in `reopen': exclusive
+access mode is not supported (ArgumentError)
+
+The documentation for reopen shows that it has two ways to call it:
+
+  reopen(other_IO) -> ios
+  reopen(path, mode [,opt]) -> ios
+
+With ruby 2.4 and 2.5 calling reopen with a path and no mode seems to
+work fine, but with ruby 2.6 this triggers the spec failure.
+
+This commit splits the calls based on stdout/stderr availability so
+that both types of reopen calls can get the required parameters. This
+fixes the 2.6 specs while being backward compatible with ruby 2.4 and
+2.5.
+---
+ lib/childprocess/unix/fork_exec_process.rb | 12 ++++++++++--
+ 1 file changed, 10 insertions(+), 2 deletions(-)
+
+diff --git a/lib/childprocess/unix/fork_exec_process.rb b/lib/childprocess/unix/fork_exec_process.rb
+index 5ed2a79..cc7a850 100644
+--- a/lib/childprocess/unix/fork_exec_process.rb
++++ b/lib/childprocess/unix/fork_exec_process.rb
+@@ -29,8 +29,16 @@ module ChildProcess
+           exec_r.close
+           set_env
+ 
+-          STDOUT.reopen(stdout || "/dev/null")
+-          STDERR.reopen(stderr || "/dev/null")
++          if stdout
++            STDOUT.reopen(stdout)
++          else
++            STDOUT.reopen("/dev/null", "a+")
++          end
++          if stderr
++            STDERR.reopen(stderr)
++          else
++            STDERR.reopen("/dev/null", "a+")
++          end
+ 
+           if duplex?
+             STDIN.reopen(reader)
+-- 
+2.33.0
+
diff --git a/rubygem-childprocess.spec b/rubygem-childprocess.spec
index ddfe090a1dff13f88ca960538964a116e5eded4e..cbd65f8a8d337954820914e1a4037ecee7da6839 100644
--- a/rubygem-childprocess.spec
+++ b/rubygem-childprocess.spec
@@ -2,11 +2,12 @@
 Summary:             A simple and reliable gem for controlling external programs
 Name:                rubygem-%{gem_name}
 Version:             0.5.9
-Release:             1
+Release:             2
 License:             MIT
 URL:                 http://github.com/enkessler/childprocess
 Source0:             http://rubygems.org/gems/%{gem_name}-%{version}.gem
-BuildRequires:       rubygems-devel rubygem(rspec) >= 3
+Patch1:              Rewrite-unix-fork-reopen-to-be-compatible-with-ruby-.patch
+BuildRequires:       rubygems-devel rubygem(rspec) >= 3 rubygem(did_you_mean)
 BuildArch:           noarch
 %description
 This gem aims at being a simple and reliable solution for controlling external
@@ -20,11 +21,14 @@ BuildArch:           noarch
 Documentation for %{name}
 
 %prep
-%setup -q -c -T
-%gem_install -n %{SOURCE0}
-
+%setup -q -n %{gem_name}-%{version}
+ 
+%patch1 -p1
+ 
 %build
-
+gem build ../%{gem_name}-%{version}.gemspec
+%gem_install
+ 
 %install
 mkdir -p %{buildroot}%{gem_dir}
 cp -a .%{gem_dir}/* %{buildroot}%{gem_dir}/
@@ -56,5 +60,8 @@ popd
 %doc %doc %{gem_docdir}
 
 %changelog
+* Tue Feb 22 2022 chenchen <chen_aka_jan@163.com> - 0.5.9-2
+- fix build error caused by upgrading to ruby3
+
 * Tue Aug 18 2020 wanglin <wanglin175@huawei.com> - 0.5.9-1
 - package init