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Archived:Binary-incompatible change in Open C to require proper permission checks for creating IPC resources (Known Issue)

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This known issue outlines binary incompatible changes to the Open C architecture in the next release. These changes will improve the performance and better adhere to POSIX standards.

Article Metadata
Tested with
Devices(s): All (S60 3rd Edition devices)
Compatibility
Platform(s): S60 3rd Edition
Symbian
S60 3rd Edition (initial release)
Article
Created: User:Technical writer 1 (20 Aug 2008)
Last edited: hamishwillee (15 Jun 2012)

Description

Proper permissions must now be defined when creating IPC (inter-process communication) resources (shm, semaphore, and msgqueue). The flag argument (value) can no longer be just IPC_CREAT. Specifying only IPC_CREAT means that the IPC resource is created with absolutely no permissions, and will result in EACCESS error.

How to reproduce

 int msgid;      
struct msqid_ds buf = {0};
msgid = msgget(1000, 512); /* returns with errno = 13 */

Solution

Starting from the next Open C release, IPC_CREAT has to be OR-ed with READ (0400) or/and WRITE (0200) permission.

This page was last modified on 15 June 2012, at 10:00.
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