rdate.c

vxworks 下的网络程序源码 包括

/* rdate.c - Demo for displaying the results of the date command executed on 
              a remote UNIX  host */
 
 /* Copyright 1984-1997 Wind River Systems, Inc. */
 
 /*
 modification history
 --------------------
 01a,16Sep97,mm   added include <stdio.h> <unistd.h> and <remLib.h>
 01a,09Feb92,ms   written
 */
 
 #include "vxWorks.h"
 #include <remLib.h>
 #include <stdio.h>
 #include <unistd.h> 
 
 #define RSH_PORT  514             /* rshd remote port number */
 #define BUFSIZE  128              /* buffer size of the result */
 
 
 /*****************************************************************************
  * rdate - display the results of the date command executed on your remote 
  *         UNIX  host 
  *
  *  EXAMPLE:
  *
  *     To run this rdate task, from the VxWorks shell do as follows:
  *     -> sp (rdate, "hostName") 
  *
  *     where hostName is the name of the UNIX host (as specified in
  *     the VxWorks target boot parameters).
  *
  *  RETURNS: OK or ERROR
  */
 
 
 STATUS rdate
     (
     char *unixHost /* name of the remote UNIX host - same as the host 
                       specified in VxWorks target boot parameters */
     )
     {
     int rshdSockFd;     /* socket fd for communicating with UNIX host's rshd */
     char userName [20]; /* local and remote user name */
     char buf [BUFSIZE]; /* buffer for getting the return value of 
                          * remote date command */
     int nRead;          /* number of bytes read */
 
 
     remCurIdGet(userName, NULL); /* get the user name */
     printf (" Name of the user is %s\n", userName);
 
     if (unixHost == NULL)
         {
         printf ("Invalid host name\n");
         return (ERROR);
         }
          
     /* execute date shell command on your UNIX host */
     if ((rshdSockFd = rcmd (unixHost, RSH_PORT, userName, userName,
                                                 "date",0)) == ERROR)
         {
         perror ("rcmd failed");
         return (ERROR);
         }
 
     /* read the return value of the date command and send it to stdout */
     if ((nRead = read(rshdSockFd, buf, BUFSIZE)) == ERROR)
         {
         perror ("read failed");
         return (ERROR);
         } 
     else 
         { 
         printf ("Number of bytes read %d \n",nRead);
         buf [nRead - 1] = '\0';
         printf ("\nDate on %s: %s \n", unixHost, buf);
         }
 
     close (rshdSockFd);
     return 1;
     }