Ok so the real problem is actually this:
ioctl(0, SNDCTL_TMR_STOP or TCSETSW, {B38400 opost isig icanon echo ...}) = 0
When this happens, the terminal is under control and less can't take it.
I've proposed a patch to libedit to avoid doing this if stdout is not a
tty, and forwarded it along to the upstream mailing list for discussion
there. I will also propose a merge shortly.
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https://bugs.launchpad.net/bugs/322214
Title:
php (via libedit using_history()) incorrectly opens stdin
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