support for connect_cin

pipe is now non blocking by default

mrw/unistd.hpp

@@ -9,6 +9,10 @@
     @license LGPL, see file <a href="license.html">COPYING</a>
 
     $Log$
+    Revision 1.6  2004/12/14 20:32:10  marc
+    support for connect_cin
+    pipe is now non blocking by default
+
     Revision 1.5  2004/08/28 16:21:25  marc
     mrw-c++-0.92 (mrw)
     - new file: version.cpp
@@ -33,6 +37,7 @@
 #define __MRW_UNISTD_HPP__
 
 #include <unistd.h> // pipe, close
+#include <fcntl.h> // fcntl (O_NONBLOCK)
 #include <errno.h> // errno
 
 namespace mrw {
@@ -51,13 +56,22 @@ namespace mrw {
     int _lastError;
   public:
     /// creates a unix pipe
-    Pipe() throw(std::bad_exception): _lastError(-1) {
+    /** @param blocking Flag whether the pipe is blocking (default: no) */
+    Pipe(bool blocking=false) throw(std::bad_exception): _lastError(-1) {
       _fd[0] = -1;
       _fd[1] = -1;
-      if (::pipe(_fd)==-1)
-        {
+      if (::pipe(_fd)==-1) {
+        _lastError=errno;
+        return;
+      }
+      if (!blocking) {
+        int val(fcntl(_fd[0], F_GETFL, 0));
+        if (fcntl(_fd[0], F_SETFL, (val!=-1?val:0)|O_NONBLOCK) == -1)
           _lastError=errno;
-        }
+        val = fcntl(_fd[1], F_GETFL, 0);
+        if (fcntl(_fd[1], F_SETFL, (val!=-1?val:0)|O_NONBLOCK) == -1)
+          _lastError=errno;
+      }
     }
     /// destructor closes pipe if still open
     ~Pipe() throw(std::bad_exception) {
@@ -92,6 +106,13 @@ namespace mrw {
     int error() throw() {
       return _lastError;
     }
+    /// connect input stream to @c stdin
+    void connect_cin() throw(std::bad_exception) {
+      while (::dup2(_fd[0], 0)==-1) if (errno!=EINTR) {
+        _lastError = errno;
+        return;
+      }
+    }
     /// connect output stream to @c stdout
     void connect_cout() throw(std::bad_exception) {
       while (::dup2(_fd[1], 1)==-1) if (errno!=EINTR) {