write(4, "{", 1)                        = 1
write(4, "\"", 1)                       = 1
write(4, "hello", 5)                    = 5
write(4, "\"", 1)                       = 1
write(4, ":", 1)                        = 1
write(4, "\"", 1)                       = 1
write(4, "world", 5)                    = 5
write(4, "\"", 1)                       = 1
write(4, "}", 1)                        = 1
read(5, "{\"hello\":\"world\"}", 1024)  = 17
read(5, 0x7fff130b2eb8, 1024)           = -1 EAGAIN (Resource temporarily unavailable)
poll([{fd=5, events=POLLIN}], 1, -1