Implementing non-blocking read.

git-svn-id: https://svn.microneil.com/svn/CodeDweller/branches/adeniz_1@53 d34b734f-a00e-4b39-a726-e4eeb87269ab

child.cpp

       throw std::runtime_error("Error creating pipe for stdin:  " +
 			       getErrorText());
     }
-    if (pipe(childStdOutPipe) != 0) {
+    if (pipe(childStdOutPipe, O_NONBLOCK) != 0) {
       close(childStdInPipe[0]);
       close(childStdInPipe[1]);
       throw std::runtime_error("Error creating pipe for stdout:  " +

child.hpp

       /// Override streambuf::underflow().
       int_type underflow();
 
+      /// Fill the buffer.
+      //void fillBuffer();
+
       /// Copy constructor not implemented.
       ReadStreambuf(const ReadStreambuf &);
 
     /// Input stream to read data from the child's standard output.
     std::istream reader;
 
+    /** Get the number of bytes available for input.
+
+	@returns number of bytes that can be read from reader without
+	blocking.
+
+    */
+    ssize_t inputBytesAvailable();
+
     /// Output stream to write data to the child's standard input.
     std::ostream writer;
 
     */
     void run();
 
-    /** Check if input is available.
-
-	\returns true if at least one character is available for
-	reading.
-
-    */
-    //bool hasData();
-
     /** Terminite the child process.
 
 	\throws runtime_error if an error occurs.