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libcutils: Implement ashmem_valid on host. 

Was missing.

Bug: 124524556
Test: build host code with dependency on this
Change-Id: I0074923e9ec53e42f9479fff47df0a24c8750164
This commit is contained in:
Steven Moreland 2019-09-04 17:48:32 -07:00
parent a9ffef27e1
commit c0660668e7
1 changed files with 24 additions and 12 deletions
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36
libcutils/ashmem-host.cpp
View File

@ -34,6 +34,29 @@
#include <utils/Compat.h>
static bool ashmem_validate_stat(int fd, struct stat* buf) {
int result = fstat(fd, buf);
if (result == -1) {
return false;
}
/*
* Check if this is an "ashmem" region.
* TODO: This is very hacky, and can easily break.
* We need some reliable indicator.
*/
if (!(buf->st_nlink == 0 && S_ISREG(buf->st_mode))) {
errno = ENOTTY;
return false;
}
return true;
}
int ashmem_valid(int fd) {
struct stat buf;
return ashmem_validate_stat(fd, &buf);
}
int ashmem_create_region(const char* /*ignored*/, size_t size) {
char pattern[PATH_MAX];
snprintf(pattern, sizeof(pattern), "/tmp/android-ashmem-%d-XXXXXXXXX", getpid());
@ -65,18 +88,7 @@ int ashmem_unpin_region(int /*fd*/, size_t /*offset*/, size_t /*len*/) {
int ashmem_get_size_region(int fd)
{
struct stat buf;
int result = fstat(fd, &buf);
if (result == -1) {
return -1;
}
/*
* Check if this is an "ashmem" region.
* TODO: This is very hacky, and can easily break.
* We need some reliable indicator.
*/
if (!(buf.st_nlink == 0 && S_ISREG(buf.st_mode))) {
errno = ENOTTY;
if (!ashmem_validate_stat(fd, &buf)) {
return -1;
}