proc: read all data from /proc/pid/task/tid/children (v2)
proc: read all data from /proc/pid/task/tid/children (v2)

Currently we read only 4096 bytes (the size of buf).

v2: use the bfd engine
Signed-off-by: Andrew Vagin <74c05afa918858348d6db8037d82fa8124870113@openvz.org>
Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@parallels.com>

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