Mercurial > sdl-ios-xcode
view src/audio/SDL_audiomem.c @ 1199:2d6dc7de1145
From: Mike Frysinger <vapier@gentoo.org>
To: sdl@libsdl.org
Date: Sun, 11 Dec 2005 22:57:37 -0500
Subject: [SDL] exec stack in libsdl update
i posted back in September a patch to remove executable stacks:
http://www.devolution.com/pipermail/sdl/2005-September/070626.html
later in November, a similar patch was merged it seems:
http://www.libsdl.org/cgi/cvsweb.cgi/SDL12/src/hermes/mmx_main.asm
however, this lacks the additional output format checks that i posted in my
patch ... this isnt a problem if the hermes asm code is only ever used to
produce ELF objects, but if this is not true, then the additional checks in
my original patch will need to be merged
-mike
author | Ryan C. Gordon <icculus@icculus.org> |
---|---|
date | Mon, 12 Dec 2005 09:13:12 +0000 |
parents | b8d311d90021 |
children | c9b51268668f |
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/* SDL - Simple DirectMedia Layer Copyright (C) 1997-2004 Sam Lantinga This library is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with this library; if not, write to the Free Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA Sam Lantinga slouken@libsdl.org */ #ifdef SAVE_RCSID static char rcsid = "@(#) $Id$"; #endif /* Functions to allocate audio buffer memory, shareable across threads (necessary because SDL audio emulates threads with fork() */ #include <stdlib.h> #ifdef FORK_HACK #include <sys/types.h> #include <sys/ipc.h> #include <sys/shm.h> #include <stddef.h> #endif #include "SDL_audiomem.h" /* Allocate memory that will be shared between threads (freed on exit) */ void *SDL_AllocAudioMem(int size) { void *chunk; #ifdef FORK_HACK int semid; /* Create and get the address of a shared memory segment */ semid = shmget(IPC_PRIVATE, size, (IPC_CREAT|0600)); if ( semid < 0 ) { return(NULL); } chunk = shmat(semid, NULL, 0); /* Set the segment for deletion when it is detatched */ shmctl(semid, IPC_RMID, NULL); /* Delets semid if shmat() fails */ #else chunk = malloc(size); #endif return((void *)chunk); } void SDL_FreeAudioMem(void *chunk) { #ifdef FORK_HACK shmdt(chunk); #else free(chunk); #endif }