Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 7be52b1a authored by Bjorn Bringert's avatar Bjorn Bringert
Browse files

Added ashmem_get_size_region() function. 

This is needed by the MemoryFile changes in
https://android-git.corp.google.com/g/2714
where it is used to find out whether a file descriptor
refers to an ashmem region.
parent 3c5a6f0b

include/cutils/ashmem.h

+1 −0
Original line number Diff line number Diff line
@@ -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

}

libcutils/ashmem-dev.c

+5 −0
Original line number Diff line number Diff line
@@ -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);

}

libcutils/ashmem-host.c

+20 −0
Original line number Diff line number Diff line
@@ -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)?

}