used this code to make pipe need help

[Maulkin]

this code is surrposed to create a pipe place two messages on it then read them off.

#include <unistd.h>
#include <stdio.h>

#define msgSize 8

char *lock = &quot;1&quot;;
char *unlock = &quot;2&quot;;

main(){
	char inbuf[msgSize];
	int p[2], j;
	
	/* open the pipe */
	if (pipe(p) == -1){
		perror(&quot;pipe call&quot;);
		exit(1);
	}
	
	/* write the messages */
	write(p[1], lock, msgSize);
	write(p[1], unlock, msgSize);
	
	for(j = 0; j < 3; j++){
		read(p[0], inbuf, msgSize);
		printf(&quot;%s\n&quot;, inbuf);
	}
	
	exit(0);
}
[\code]

I get an error message when I try to build the message says

Linker Error (Severity 4)
	Module &quot;a&quot; in file &quot;app.obj&quot;
	references unresolved external &quot;_pipe&quot;
	at offset 000DH in segment &quot;_text&quot;.

Linker Error (Severity 4)
	Module &quot;a&quot; in file &quot;app.obj&quot;
	references unresolved external &quot;_perror&quot;
	at offset 0045H in segment &quot;_text&quot;.

can anyone help?

 

[Guest_imported]

hey!
Just include the library path where the pipe call stays while compiling the code.
and let me know whether it works or not?

 

[Maulkin]

I was under the impression that the pipe call was in the unistd header. if it's not can you tell me where it would be

 

[chipperMDW]

Yes, it's in <unistd.h>, assuming you're using Unix. I'm just pointing that out because I notice the errors refer to an &quot;app.obj&quot;, which sounds like you might not be using Unix (where it would normally be &quot;app.o&quot. If you are, sorry, my mistake.