Fixes #3537

[cristovao-trevisan]

Fixing #3537

[devyte]

@cristovao-trevisan this doesn't look right to me. For starters, a global variable with the state of the retries means that only one write can be in effect at any single time.
I would expect that the caller checks the returned value, and implements a loop of retries. After a number of attempts that result in no data being sent, it gives up and closes.
Am I misunderstanding something?
@igrr what do you think?

[devyte]

@igrr what are your thoughts about this?

[devyte]

Closing due to previous comments.