poll([{fd=3, events=POLLIN}, {fd=8, events=POLLIN}, {fd=7, events=POLLIN}, {fd=11, events=POLLIN}], 4, -1) = 1 ([{fd=3, revents=POLLIN}])
read(3, "A", 1)                         = 1
read(7, 0x22362c4, 4096)                = -1 EAGAIN (Resource temporarily unavailable)
read(7, 0x22362c4, 4096)                = -1 EAGAIN (Resource temporarily unavailable)