linux-kernel - getting a return from a system call

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Date:	Tue, 17 Oct 2006 14:45:57 +0500
From:	"Irfan Habib" <irfan.habib@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: getting a return from a system call

Hi,

I'm trying to build a system call which returns a float, and is defined as :
asmlinkage float sys_ph_pinfo(int pid, int mode)

but in a user level program every time, I evaluate it, I always get a return 0!
How do I capture the return of a system call?

Also is it possible that a system call return a structure or array?
Will that be available in user space? My hunch is that this is not
possible, as kernel memory space is disjoint form the user memory
space, but just for information.

Regards,
Irfan
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/