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Date: Fri, 16 Jun 2000 11:13:25 -0500
From: "Yonny Cardenas B." <ycardena@yahoo.com>
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To: hackersBSD <hackers@FreeBSD.ORG>
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	German Vega <gvega@uniandes.edu.co>
Subject: RTP as system calls.
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Hello 

I want you to ask a favor. 

I'm incorporating the Real Time Transport Protocol(RTP) to FreeBSD
Kernel.

I want use the RTP Library API developed by Lucent
http://www.cs.columbia.edu/~hgs/rtplib/rtplib-1.0a1/rtp_api.html

First, I want try if this API can be add to Kernel as system calls.

I know this a little crazy but I think that is possible, with
corrections of course.

I compiled with the Kernel this APIs without problems. But I have 
problems linking kernel. The following message is show it:

cc -c -O -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes 
-Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual 
-fformat-extensions -ansi  -nostdinc -I- -I. -I../.. -I/usr/include 
-D_KERNEL -include opt_global.h -elf  -mpreferred-stack-boundary=2 
vers.c
linking kernel
init_sysent.o(.data+0xb8c): undefined reference to `RTPSend'
init_sysent.o(.data+0xc0c): undefined reference to `RTPSchedule'
rtp_unix.o: In function `_sys_bind':
rtp_unix.o(.text+0x141): undefined reference to `__error'
rtp_unix.o: In function `_sys_send':
rtp_unix.o(.text+0x1c8): undefined reference to `send'
rtp_unix.o: In function `random32':
rtp_unix.o(.text+0x23d): undefined reference to `clock'
rtp_unix.o(.text+0x253): undefined reference to `gethostid'

I don't understand the message "undefined reference to", 
for example the function "send" is a socket API. 

In the file rtp_unix.c you can see:

  #include <sys/types.h>
  #include <sys/socket.h>
  ...

  int _sys_send(socktype skt, char *buf, int buflen, int flags) {
	int res;
	res = send(skt, buf, buflen, flags);
	return(res);
  }

In the Kernel Makefile: 
  rtp_unix.o: $S/kern/rtp/rtp_unix.c 
    ${NORMAL_C}

In the RTPLibrary Makefile: 
  rtp_unix.o: rtp_unix.c rtp_unix.h rtp_api.h sysdep.h config.h


I have some questions:

1) Can I call functions level's user into kernel, as socket() or
calloc() ? 

2) How must I use the global variable "errno" for value 
returned for system calls ? Is sufficient with  #include <sys/errno.h> ?

3) How can I solve above linking errors.

Thanks for your help.

+------------------------------------------------------------------+
| YONNY CARDENAS B.             Apartado Aereo  22828	      	   |
| Systems Engineer    		Santafe de Bogota D.C.   	   |
|				Colombia - South America	   |	
| Student M.Sc.		     	Tels:   +571 6095477  		   | 
| UNIVERSIDAD DE LOS ANDES     	mailto:	y-carden@uniandes.edu.co   | 
|                                	ycardena@yahoo.com         |
+------------------------------------------------------------------+
UNIX is BSD, and FreeBSD is an advanced 4.4BSD


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