Keep isFinished() false on StreamLog until stdin is closed

seeklog.cpp

@@ -32,6 +32,10 @@
 #include <unistd.h>
 #endif
 
+#ifndef _WIN32
+#include <poll.h>
+#endif
+
 long long gSeekLogMaxBufferSize = 104857600;
 
 //StreamLog
@@ -95,6 +99,33 @@ bool StreamLog::isFinished() {
     return false;
 }
 
+bool StreamLog::isOpen() {
+    if(fcntl_fail) return false;
+
+#ifdef _WIN32
+    DWORD available_bytes;
+    if(!PeekNamedPipe(stdin_handle, 0, 0, 0, &available_bytes, 0)) {
+        return false;
+    }
+    return true;
+#else
+    struct pollfd pfd;
+    pfd.fd     = STDIN_FILENO;
+    pfd.events = POLLIN;
+
+    int ret = poll(&pfd, 1, 0);
+
+    if(ret < 0)  return false;
+    if(ret == 0) return true;
+
+    if(pfd.revents & (POLLHUP | POLLERR | POLLNVAL)) {
+        return false;
+    }
+
+    return true;
+#endif
+}
+
 // SeekLog
 
 SeekLog::SeekLog(std::string logfile) {

seeklog.h

@@ -44,6 +44,7 @@ class BaseLog {
     virtual ~BaseLog() {};
     virtual bool getNextLine(std::string& line) { return false; };
     virtual bool isFinished() { return false; };
+    virtual bool isOpen()     { return !isFinished(); };
 };
 
 class StreamLog : public BaseLog {
@@ -58,6 +59,7 @@ class StreamLog : public BaseLog {
 
     bool getNextLine(std::string& line);
     bool isFinished();
+    bool isOpen();
 };
 
 class SeekLogException : public std::exception {