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Name anonymous mmap mallocs.

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Change-Id: Icc53ba1eecb8445210623826d8e99a611d686f7f
This commit is contained in:
Ian Rogers
2013-01-11 15:25:44 -08:00
parent 69c89942db
commit 8921060253
1 changed files with 41 additions and 0 deletions
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41
libc/bionic/dlmalloc.c
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@@ -24,6 +24,10 @@ static void __bionic_heap_error(const char* msg, const char* function, void* p);
#define USAGE_ERROR_ACTION(m,p) \
__bionic_heap_error("ARGUMENT IS INVALID HEAP ADDRESS", __FUNCTION__, p)
/* Bionic named anonymous memory declarations */
static void* named_anonymous_mmap(size_t length);
#define MMAP(s) named_anonymous_mmap(s)
/*
* Ugly inclusion of C file so that bionic specific #defines configure
* dlmalloc.
@@ -74,3 +78,40 @@ static void __bionic_heap_error(const char* msg, const char* function, void* p)
/* So that we can get a memory dump around p */
*((int **) 0xdeadbaad) = (int *) p;
}
/* Bionic named anonymous memory definitions */
#include <linux/ashmem.h>
static int __ashmem_create_region(const char* name, size_t size)
{
int fd, ret;
fd = open("/dev/ashmem", O_RDWR);
if (fd < 0)
return fd;
if (name != NULL) {
char buf[ASHMEM_NAME_LEN];
strlcpy(buf, name, sizeof(buf));
ret = ioctl(fd, ASHMEM_SET_NAME, buf);
if (ret < 0) { /* error */
close(fd);
return ret;
}
}
ret = ioctl(fd, ASHMEM_SET_SIZE, size);
if (ret < 0) { /* error */
close(fd);
return ret;
}
return fd;
}
static void* named_anonymous_mmap(size_t length)
{
void* ret;
int fd = __ashmem_create_region("libc malloc", length);
if (fd < 0)
return MAP_FAILED;
ret = mmap(NULL, length, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
close (fd);
return ret;
}