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am 3f627205: Merge change 2875 into donut

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Merge commit '3f6272056275a00c30c07394d63bbe81cc9c5eba'

* commit '3f6272056275a00c30c07394d63bbe81cc9c5eba':
  Added ashmem_get_size_region() function.
This commit is contained in:
Android (Google) Code Review 2009-06-02 05:30:08 -07:00 committed by The Android Open Source Project
commit baf83e0250
3 changed files with 26 additions and 0 deletions
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1
include/cutils/ashmem.h
View file

@ -18,6 +18,7 @@ int ashmem_create_region(const char *name, size_t size);
int ashmem_set_prot_region(int fd, int prot);
int ashmem_pin_region(int fd, size_t offset, size_t len);
int ashmem_unpin_region(int fd, size_t offset, size_t len);
int ashmem_get_size_region(int fd);
#ifdef __cplusplus
}

5
libcutils/ashmem-dev.c
View file

@ -83,3 +83,8 @@ int ashmem_unpin_region(int fd, size_t offset, size_t len)
struct ashmem_pin pin = { offset, len };
return ioctl(fd, ASHMEM_UNPIN, &pin);
}
int ashmem_get_size_region(int fd)
{
return ioctl(fd, ASHMEM_GET_SIZE, NULL);
}

20
libcutils/ashmem-host.c
View file

@ -92,3 +92,23 @@ int ashmem_unpin_region(int fd, size_t offset, size_t len)
{
return ASHMEM_IS_UNPINNED;
}
int ashmem_get_size_region(int fd)
{
struct stat buf;
int result;
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;
return -1;
}
return (int)buf.st_size; // TODO: care about overflow (> 2GB file)?
}