linux-kernel - return negative number for unsigned long function in kernel

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>] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 6 Mar 2007 09:52:34 -0500
From:	"Chen, Dongliang" <Chen.D@...-t.com>
To:	<linux-kernel@...r.kernel.org>
Cc:	"Chen, Dongliang" <Chen.D@...-t.com>
Subject: return negative number for unsigned long function in kernel

There are lots of functions in the Linux kernel that are declared as
unsigned long, but the return value is negative integer while error
occurred. An example of these functions is do_mmap_pgoff in mm/mmap.c,
which is defined as:

unsigned long do_mmap_pgoff(....)

In this function, it returns -ENODEV, -EPERM, -ENOMEM, -EINVAL, -EAGAIN,
-EACCESS depends on the error type. My question is how should the caller
perform error check based on the return value? 


Please CC reply to me at chen.d@...-t.com
 

Thanks,

Dongliang Chen

Staff Engineer
EMS Technologies, Inc - Defense and Space Systems
660 Engineering Dr
Norcross, GA 30092
Tel: 770-263-9200 x 4379



-
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/