nfswrite.c

vxworks 下的网络程序源码 包括

/* nfsWrite.c - Demo for writing data to NFS file on UNIX host */
 
 /* Copyright 1984-1997 Wind River Systems, Inc. */
 
 /*
 modification history
 --------------------
 01c,06nov97,mm   added copyright.
 01b,16Sep97,mm   added #include <string.h> and #include <stdlib.h>
 01a,02mar93,ms   written
 */
 #include <string.h>
 #include <stdlib.h>
 #include "vxWorks.h"
 #include "stdioLib.h"
 #include "ioLib.h"
 
 #define DATA_FILE_NAME "/petaluma1/mayur/Net-project/R_Dir/net/nfs/nfsWrite.dat" /* data file name */
 #define DATA_FILE_MODE 0755       /* mode of data file (UNIX chmod style) */
 #define TWO            2          /* Maximum two characters to write the line
                                    * numbers in the NFS data file 
                                    */ 
 
 /****************************************************************************
  * nfsWrite - Writes data to NFS file on UNIX host
  *
  * RETURNS: OK or ERROR
  *
  * CONFIGURATION
  * You need to set/change the value of the DATA_FILE_NAME constant to the full
  * path name of the NFS data file that you want to create.
  *
  * EXAMPLE
  * To run this program from the VxWorks shell do as follows:
  *
  *  -> sp (nfsWrite)
  */
 
 
 STATUS nfsWrite ()
     {
     int fd;
     int count;
     char *buffer;
     char msg[] = ": Hello World !!! \n"; 
 
     if ((buffer = (char *) malloc (strlen (msg) + TWO)) == NULL)
         {
         perror ("malloc failed");
         return(ERROR);
         }
 
     fd = open (DATA_FILE_NAME, O_CREAT | WRITE, DATA_FILE_MODE);
     if (fd < 0)
 	{
         perror ("file open failed ");
         free (buffer);
 	return (ERROR);
 	}
 
     printf ("Writing to NFS file \n");
     for (count = 0; count < 11; count++)
 	{
 	sprintf (buffer, "%d%s", count, msg);
 	if (write (fd, buffer, strlen (buffer)) == ERROR) 
             {
             perror ("write failed");
             return (ERROR);
             }
         else
 	    {
             /* VxWorks caches the write request in NFS client code.
              * The default cache size is 8192. To write the data
              * immediately to the file without buffering, FIOSYNC option 
              * is used here to flush the NFS write cache.
              */
 
             if (ioctl (fd, FIOSYNC, 0) == ERROR)
                 {
                 perror ("FIOSYNC ioctl option failed");
                 return (ERROR);
                 }
 	    printf (".\n");
 	    }
         }
 
     free (buffer);
     close (fd);
     printf ("Completed nfsWrite\n");
     return (OK);
     }