Date: Mon, 17 May 1999 17:10:57 -0400 (EDT) From: Zhihui Zhang <zzhang@cs.binghamton.edu> To: yiyung@mmlab.snu.ac.kr Cc: dwhite@resnet.uoregon.edu, freebsd-questions@FreeBSD.ORG Subject: Procedure used to add a system call Message-ID: <Pine.GSO.3.96.990517164646.27557A-100000@sol.cs.binghamton.edu> In-Reply-To: <Pine.BSF.4.03.9905171319500.15052-100000@resnet.uoregon.edu>
next in thread | previous in thread | raw e-mail | index | archive | help
I have used the following steps to add system calls to FreeBSD 3.1 several
times. Suppose you want to add a system call: int mysys(int a, int b, int
c). You can do the following steps:
(1) # cd /usr/src/sys/kern
(2) # vi syscalls.master to add your system call into the file:
172 STD BSD { int mysys(int a, int b, int c); }
The number 172 can be another number that is not currently in use.
(3) # sh makesyscalls.sh syscalls.master
This creates three files: syscall.h, syscall-hide.h, and sysproto.h.
(4) # vi mysys.c
Edit your file to implement your mysys(). You can follow the file
kern/vfs_syscalls.c.
(6) # vi /sys/conf/files to add you file mysys.c into it.
(7) Make a new kernel and install it (see FreeBSD handbook)
The following steps update the libc library:
(8) copy syscall.h, syscall-hide.h, and sysproto.h to /usr/include/sys
(9) # cd /usr/src/lib/libc
(10) # make obj
(11) # make depend
(12) # make all
(13) # make insall
Now you can reboot your machine and write a program that uses your
mysys(). Good luck!
-Zhihui
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-questions" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?Pine.GSO.3.96.990517164646.27557A-100000>