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add mremap implementation for where it's not provided

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This commit is contained in:
notaz 2013-06-30 20:22:49 +02:00
parent 504e2f5688
commit 8c8b728472
1 changed files with 28 additions and 0 deletions
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28
platform/libretro.c
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@ -21,6 +21,10 @@
#include "common/version.h"
#include "libretro.h"
#ifndef MAP_ANONYMOUS
#define MAP_ANONYMOUS MAP_ANON
#endif
static retro_video_refresh_t video_cb;
static retro_input_poll_t input_poll_cb;
static retro_input_state_t input_state_cb;
@ -92,11 +96,35 @@ void *plat_mmap(unsigned long addr, size_t size, int need_exec, int is_fixed)
void *plat_mremap(void *ptr, size_t oldsize, size_t newsize)
{
#ifdef __linux__
void *ret = mremap(ptr, oldsize, newsize, 0);
if (ret == MAP_FAILED)
return NULL;
return ret;
#else
void *tmp, *ret;
size_t preserve_size;
preserve_size = oldsize;
if (preserve_size > newsize)
preserve_size = newsize;
tmp = malloc(preserve_size);
if (tmp == NULL)
return NULL;
memcpy(tmp, ptr, preserve_size);
munmap(ptr, oldsize);
ret = mmap(ptr, newsize, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (ret == MAP_FAILED) {
free(tmp);
return NULL;
}
memcpy(ret, tmp, preserve_size);
free(tmp);
return ret;
#endif
}
void plat_munmap(void *ptr, size_t size)