Problem in adding a system call to FreeBSD kernel

C

CS_26_OS

I'm pretty sure the first step in adding a system call is through /usr/src/sys/kern/syscalls.master, but when I enter, it replies
Code: 
permission denied
even though I'm logged in as root.

Any quick ideas?
 
Check your file permissions, maybe the following line will help you:
Code: 
chmod 644 syscalls.master

HTH,
doena
 
Thank you very much for your reply, but i think i figured out what i was missing. I used EDIT /usr/src/sys/kern/syscalls.master command. Now im in the stage of editing the syscalls.master file to add a system call.

I would like to add a simple hello world system call which prints/outputs [CMD="Hello world!"][/CMD]. Does anyone have a hello world code for FreeBSD?
 
CS_26_OS said:
Thank you very much for your reply, but i think i figured out what i was missing. I used EDIT /usr/src/sys/kern/syscalls.master command. Now im in the stage of editing the syscalls.master file to add a system call.

I would like to add a simple hello world system call which prints/outputs [CMD="Hello world!"][/CMD]. Does anyone have a hello world code for FreeBSD?
Click to expand...


Good tutorial
http://www.hailang.me/index.php/tec...-system-call-first-kernel-service-application/
 
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