Knowledge Base Nr: 00086 fifo_linux.cpp - http://www.swe-kaiser.de

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linux: beispiel fifo (named pipe)

  

#include <iostream.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

int main(int argc, char *argv[])
{
  cout << "Start!" << endl;

  char* lpszPipe = "/home/testpipe1";

  int nErr = mkfifo(lpszPipe, S_IRWXU|S_IRWXG|S_IRWXO);
  if (nErr)
    cerr << "Fehler: mkfifo " << nErr << endl;

  int fd;
  if (argc > 1)
  {
    cout << "Schreiben!" << endl;
    fd = open(lpszPipe, O_WRONLY);
  }
  else
  {
    cout << "Lesen!" << endl;
    fd = open(lpszPipe, O_RDONLY);
  }

  if (fd < 0)
    cerr << "Fehler: open " << fd << endl;

  if (argc > 1)
  {
    write(fd, "lulli", 5);
  }
  else
  {
    char buffer[200];
    int nRead = read(fd, buffer, 200);
    for (int n=0; n<nRead; n++)
        cout << buffer[n];
    cout << endl;
  }

  close (fd);

  cout << "Ende!" << endl;

  return EXIT_SUCCESS;
}