system/FileDescriptor: add IsPipe(), IsSocket()

src/net/SocketDescriptor.hxx

@@ -80,6 +80,7 @@ public:
 	using FileDescriptor::IsDefined;
 #ifndef _WIN32
 	using FileDescriptor::IsValid;
+	using FileDescriptor::IsSocket;
 #endif
 	using FileDescriptor::Get;
 	using FileDescriptor::Set;

src/system/FileDescriptor.cxx

@@ -65,6 +65,20 @@ FileDescriptor::IsValid() const noexcept
 	return IsDefined() && fcntl(fd, F_GETFL) >= 0;
 }
 
+bool
+FileDescriptor::IsPipe() const noexcept
+{
+	struct stat st;
+	return IsDefined() && fstat(fd, &st) == 0 && S_ISFIFO(st.st_mode);
+}
+
+bool
+FileDescriptor::IsSocket() const noexcept
+{
+	struct stat st;
+	return IsDefined() && fstat(fd, &st) == 0 && S_ISSOCK(st.st_mode);
+}
+
 #endif
 
 bool

src/system/FileDescriptor.hxx

@@ -75,6 +75,18 @@ public:
 	 */
 	gcc_pure
 	bool IsValid() const noexcept;
+
+	/**
+	 * Ask the kernel whether this is a pipe.
+	 */
+	gcc_pure
+	bool IsPipe() const noexcept;
+
+	/**
+	 * Ask the kernel whether this is a socket descriptor.
+	 */
+	gcc_pure
+	bool IsSocket() const noexcept;
 #endif
 
 	/**