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Re: Memory management for io_read(), etc.

From: Samuel Thibault
Subject: Re: Memory management for io_read(), etc.
Date: Sat, 24 Apr 2021 23:12:44 +0200
User-agent: NeoMutt/20170609 (1.8.3)

Andrew Eggenberger, le sam. 24 avril 2021 16:06:25 -0500, a ecrit:
> Thanks Samuel. So if I'm understanding correctly, if I let the RPC vm_allocate
> () filebuf I don't need to worry about vm_deallocating it?

You have to vm_deallocate() it, otherwise it'll leak.

> And if I wanted to pass a buffer in and reuse it, I should use
> vm_allocate() instead of malloc()? 

You can use malloc, you'll then have to use free on it *and*
vm_deallocate the value set by the RPC if it did change the pointer.
That's clearer to just use vm_deallocate in both case. See how it's done
in various codeplaces, you'll find tests such as if (buf != alloc_buf)


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