I am trying to find out whether remote host is connected or not using
C/C++ code on Redhat Linux. If its connected, I can send a result to
"Pass" and if its not "Failed"

I tried 2 different things:
1)

#include <stdlib.h>
#include <sys/types.h>
#include <sys/wait.h>

int ping_ret, status;

status = system("ping -w 2 192.168.0.2");

if (-1 != status)
ping_ret = WEXITSTATUS(status);

But, even if ethernet cable is connected or not to the remote host, I
always get "Ping_ret" = 0. So, I don't get a desired result in this
case.

2)
I also tried popen():

char   psBuffer[1024];
FILE   * fdRTP;


if( (fdRTP = popen( "ping -c 1 192.168.0.2", "r" )) == NULL )
{
FSLog(LOG_ERROR, "AebEthernetTest::HandleDmseCommand(): Failed to
create Pipe");
error_code = AEB_DPI_INIFILEREADERR;
}

else
{
/* Read this pipe and print to the stdout until end of file */
while( !feof( fdRTP ) )
{
if( fread( psBuffer, sizeof(char), 1024, fdRTP ) )
{
if(0 == strcmp(psBuffer,"0% loss"))
{
result = TRUE;
}
}
}
}

/* Close pipe */
pclose( fdRTP );

But, in this case, its not even "Ping".

If possible, help me guys.

Thanks

[ Post a follow-up to this message ]

"Neel" <nilayhshah@gmail.com> writes:

> I am trying to find out whether remote host is connected or not using
> C/C++ code on Redhat Linux. If its connected, I can send a result to
> "Pass" and if its not "Failed"
>
> I tried 2 different things:
> [...]
>    status = system("ping -w 2 192.168.0.2");

I'd add -q:
ping -q -w 2 192.168.0.2

In the shell, ping exit status correctly reports the result.

--
__Pascal Bourguignon__                     http://www.informatimago.com/

There is no worse tyranny than to force a man to pay for what he does not
want merely because you think it would be good for him. -- Robert Heinlein

[ Post a follow-up to this message ]

Neel wrote:
> I am trying to find out whether remote host is connected or not using
> C/C++ code on Redhat Linux. If its connected, I can send a result to
> "Pass" and if its not "Failed"
>
> I tried 2 different things:
> 1)
>
>    #include <stdlib.h>
>    #include <sys/types.h>
>    #include <sys/wait.h>
>
>    int ping_ret, status;
>
>    status = system("ping -w 2 192.168.0.2");
>
>    if (-1 != status)
>      ping_ret = WEXITSTATUS(status);
>
> But, even if ethernet cable is connected or not to the remote host, I
> always get "Ping_ret" = 0. So, I don't get a desired result in this
> case.
>
Well it works on Solaris (without the -w 2), what does the Linux man
page say for the return value of ping?

> 2)
> I also tried popen():
>
Please avoid posting tabs in code, it's hard to read.

> 	   char   psBuffer[1024];
> 	   FILE   * fdRTP;
>
>
> 	   if( (fdRTP = popen( "ping -c 1 192.168.0.2", "r" )) == NULL )
> 	   {
> 			FSLog(LOG_ERROR, "AebEthernetTest::HandleDmseCommand(): Failed to
> create Pipe");
> 			error_code = AEB_DPI_INIFILEREADERR;
> 	   }
>
> 	   else
> 	   {
> 		 /* Read this pipe and print to the stdout until end of file */
> 		   while( !feof( fdRTP ) )
> 		  {
> 		        if( fread( psBuffer, sizeof(char), 1024, fdRTP ) )
> 				{

What do you see if you print psBuffer here.

--
Ian Collins.

[ Post a follow-up to this message ]

Neel wrote:
> 		 /* Read this pipe and print to the stdout until end of file */
> 		   while( !feof( fdRTP ) )
> 		  {
> 		        if( fread( psBuffer, sizeof(char), 1024, fdRTP ) )

I didn't spot this before, but the above should be:

fgets( psBuffer, 1024, fdRTP )

--
Ian Collins.

[ Post a follow-up to this message ]