[issue36488] os.sendfile() on BSD, macOS don't return bytes sent on EINTR

[Giampaolo Rodola']

Change by Giampaolo Rodola' :


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keywords: +patch
pull_requests: +12734
stage: needs patch -> patch review

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[issue36488] os.sendfile() on BSD, macOS don't return bytes sent on EINTR

[Josh Rosenberg]

Josh Rosenberg  added the comment:

Right. So this is a hard problem for anyone to solve, and therefore os.sendfile 
should be the one solving it, not the caller of sendfile, right?

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[issue36488] os.sendfile() on BSD, macOS don't return bytes sent on EINTR

[Giampaolo Rodola']

Giampaolo Rodola'  added the comment:

sendfile() on BSD/OSX is complicated by the headers/trailers args. You'll have 
to take that into account in the retry logic, adding unnecessary complexity. 
Since sendfile() may already return fewer bytes than requested (e.g. 
non-blocking sockets or big files) it's just easier to return the bytes sent 
thus far (if any). I can work on a patch once I find some time.

> Wasn't the point of PEP475 that all EINTR returns would be explicitly handled 
> by retrying rather than forcing the user to handle it?

>From PEP475: <<[...] to relieve application code from the burden of doing so>>

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[issue36488] os.sendfile() on BSD, macOS don't return bytes sent on EINTR

[Terry J. Reedy]

Change by Terry J. Reedy :


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title: os.sendfile() on BSD and macOS does not return bytes sent on EINTR -> 
os.sendfile() on BSD, macOS don't return bytes sent on EINTR
type:  -> behavior

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