From: Mikko Rasa <tdb@tdb.fi>
Date: Tue, 15 Oct 2013 11:53:04 +0000 (+0300)
Subject: Allow setting a pipe read-only or write-only after creation
X-Git-Url: http://git.tdb.fi/?p=libs%2Fcore.git;a=commitdiff_plain;h=9a4c531eb1aa68595cd3ab074b31bfa565aaefe2

Allow setting a pipe read-only or write-only after creation

This is useful for handing the pipe to a child process and then closing
the unused end so an end-of-file event can be properly received.
---

diff --git a/source/io/pipe.cpp b/source/io/pipe.cpp
index 831076f..0a72a80 100644
--- a/source/io/pipe.cpp
+++ b/source/io/pipe.cpp
@@ -24,6 +24,22 @@ Pipe::~Pipe()
 	sys_close(write_handle);
 }
 
+void Pipe::set_mode(Mode m)
+{
+	m = m&M_RDWR;
+	if(!m)
+		throw invalid_argument("Pipe::set_mode");
+
+	check_access(m);
+
+	Mode close = mode&M_RDWR&~m;
+	if(close&M_READ)
+		sys_close(read_handle);
+	if(close&M_WRITE)
+		sys_close(write_handle);
+	mode = (mode&~M_RDWR)|m;
+}
+
 void Pipe::set_block(bool b)
 {
 	mode = (mode&~M_NONBLOCK);
diff --git a/source/io/pipe.h b/source/io/pipe.h
index 50da5e5..3f964f4 100644
--- a/source/io/pipe.h
+++ b/source/io/pipe.h
@@ -22,6 +22,7 @@ private:
 public:
 	~Pipe();
 
+	void set_mode(Mode);
 	void set_block(bool);
 
 protected: