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This page was last modified 21:11, 26 October 2007.

Exemplos de pipes rotulados

From Forum Nokia Wiki

Original: Named Pipes Example


Pipes rotulados

O código a seguir mostra como usar pipes rotulados.

#include <unistd.h>
#include <string.h>
#include <sys/stat.h>
#include <stdio.h>
#include <fcntl.h>
#include <pthread.h>
 
const char* fifopath = "C:\\mkfifo.file";
unsigned int threadid;
 
// Início da thread
void* FifoWriterThread(void* arg)
{
   const char* buf = "somejunk";
   TInt fd = open (fifopath, O_WRONLY);
   if(fd > 0 )
   {
      write(fd, buf, 9);     
      close(fd);
   }
   return 0;
}
 
void CreateThreadL()
{
   pthread_create(&threadid,(pthread_attr_t *)NULL,FifoWriterThread, NULL);
}
 
void OpenForRead()
{
   int err = mkfifo (fifopath, 0666);
   if(err != 0)
   {
       // possivelmente o arquivo já existe, apague-o
       unlink(fifopath); 
       // tente outra vez...
       err = mkfifo (fifopath, 0666);
       if(err != 0)
       {
            return;
       }
   }
   CreateThreadL();
   char buf[128];
   TInt fd = open (fifopath, O_RDONLY);
   if ( fd ( 0 )
       {
           return ;
       }
   err = read (fd, buf, 128);  
   close(fd);   
   unlink(fifopath);
}    
 
int main()
{
   OpenForRead();
   return 0;
}
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