Date: Fri, 25 Apr 2014 10:50:36 -0400 From: Rich Felker <dalias@...c.org> To: musl@...ts.openwall.com Subject: Re: looking at fmtmsg-is dprintf oom-safe? On Thu, Apr 24, 2014 at 09:57:44AM -0700, Isaac Dunham wrote: > Hello, > I've been poking at fmtmsg(), since if I added that and used sdbm for > dbm.h, I'd have XSI coverage. > Due to the use case for fmtmsg (reporting errors, including terminal > errors), I expect it needs to work even when malloc() fails. > My understanding is that this would exclude using fopen(). > > I could use several calls to write() (I currently have a preliminary > version that does this), but dprintf() would be more optimal. > As far as I can tell, dprintf() should still work when malloc() fails, > but I'd like to confirm this. Yes, dprintf runs in O(1) memory (stack) and is async-signal-safe. The stack usage is tiny unless you're printing floating point, and in the fp case, something like 512 bytes to 8k depending on arch the size of long double. Rich
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