Re: sys_sem* undefined

[Randy.Dunlap]

On Thu, 26 Aug 2004 14:44:03 +0100 (BST) Arne Henrichsen wrote:

| Hi,
| 
| I realise now that one obviously calls these functions
| via system calls. Ok, I have never done that before in
| Linux. This is probably not the correct group to ask
| this, but where is there a good place to start? Maybe
| with a simple example on how to do system calls in
| Linux?

>From an application (userspace) or from inside the kernel?

There are many "howto add a system call to Linux" web pages
out there (use google).  Oh, you want "howto do a system call."

>From userspace, usually use a library:  app calls library
function, which does the syscall.  Or you can roll your
own syscalls.  The howtos on adding a system call to Linux
usually show you how to do that part also.[1]

--
~Randy

[1] written for 2.4.18:
http://www.xenotime.net/linux/syscall_ex/howto_adda_syscall.txt
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