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ID	KIS001077	Creation date	August 20, 2008
Platform	S60 3rd Edition	Devices	All (S60 3rd Edition devices)
Category	Open C	Subcategory	IPC, Compatibility

Keywords (APIs, classes, methods, functions):

Overview

To improve the performance and better adhere to POSIX standards, the next release of Open C will undergo some changes in the architecture. Some of the changes will also affect the binary compatibility with previous releases.

Description

Proper permissions must now be defined when creating IPC (inter-process communication) resources (shm, semaphore</tt, and <tt>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.