Mercurial > repos > blastem
view mem.c @ 27:aa1c47fab3f1
Fix sprite transparency for overlapping sprites
author | Mike Pavone <pavone@retrodev.com> |
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date | Sat, 08 Dec 2012 16:58:11 -0800 |
parents | 3e7bfde7606e |
children | 140af5509ce7 |
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#include <sys/mman.h> #include <stddef.h> #include <stdint.h> #include <stdlib.h> #include <unistd.h> #include "mem.h" /* void * alloc_code(size_t *size) { *size += PAGE_SIZE - (*size & (PAGE_SIZE - 1)); return mmap(NULL, *size, PROT_EXEC | PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); } */ /* void * alloc_code(size_t *size) { char * ret = malloc(*size); char * base = (char *)(((intptr_t)ret) & (~(PAGE_SIZE-1))); mprotect(base, (ret + *size) - base, PROT_EXEC | PROT_READ | PROT_WRITE); return ret; } */ void * alloc_code(size_t *size) { *size += PAGE_SIZE - (*size & (PAGE_SIZE - 1)); void * ret = sbrk(*size); if (ret == ((void *)-1)) { return NULL; } mprotect(ret, *size, PROT_EXEC | PROT_READ | PROT_WRITE); return ret; }