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ID	KIS001076	Creation date	August 20, 2008
Platform	S60 3rd Edition	Devices	All (S60 3rd Ed)
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

Memory execution is not supported by the platform (Symbian OS does not support executable buffers). Therefore, specifying PROC_EXEC only (setting only the eXecute part in file permissions) is not supported and returns with ENOSUP.

If any other parts (such as read/write) are specified along with the PROC_EXEC, the permission to execute is simply ignored.

How to reproduce

int fd = -1; 
  char* mapaddr; 
  int len = getpagesize(); 
  int prot = PROT_EXEC;     /* not supported */
 
  if((fd = open("c:\\Test.txt", O_RDWR | O_CREAT, 0666)) < 0) { 
    printf("file open failed\n"); 
  }
  /* returns with errno = 45 */
  mapaddr = (char*)mmap((void*)0, len, prot, MAP_SHARED, fd, 0);

Solution

No solution.