CODEWITHSUNDEEP
cposix
pylua
pylua

Reputation: 635

File Path to in memory file

I have a void *buffer that is an instance of a file in RAM.

The file type is in a format that must be parsed by the API given.

Unfortunately, the only way to open this file type through the API is to supply the API with the file path:

sample_api_open(char *file_name, ...);

I understand that shm_open returns the file descriptor, but the API only takes a file path.

Is there a work around to read this type of file in memory?

Upvotes: 1

Views: 2243

Answers (2)

Dummy00001
Dummy00001

Reputation: 17420

Is there a work around to read this type of file in memory?

Dump the content of the buffer into a temporary file on /tmp.

On the vast majority of modern *NIX systems, the /tmp is a synthetic, in-memory file system. Only in case of the memory shortage, the content might hit the disk due to the swapping.

If the amount of the information is too large, to avoid duplication, after dumping the content onto /tmp, you can free the local memory and mmap() the content of the file.

Upvotes: 1

fuz
fuz

Reputation: 92984

Instead of using POSIX shared memory, you could open a temporary file and mmap() it. Then make the buffer end up in the mmap()-ed region so you can finally call the API on the temporary file.

Upvotes: 0

Related Questions