noblock

socket(AF_INET, SOCK_STREAM, IPPROTO_IP) = 4
bind(4, {sa_family=AF_INET, sin_port=htons(25050), sin_addr=inet_addr("0.0.0.0")}, 16) = 0
listen(4, 50)

//  man 2 fcntl
fcntl(4, F_SETFL, O_RDWR|O_NONBLOCK)    = 0
accept(4, 0x7f9f640dbbe0, [16])         = -1 EAGAIN (Resource temporarily unavailable)
accept(4, {sa_family=AF_INET, sin_port=htons(57000), sin_addr=inet_addr("127.0.0.1")}, [16]) = 5

// 
fcntl(5, F_GETFL)                       = 0x2 (flags O_RDWR)
read(5, "adfadafsdfiae;fieafi", 4096)   = 20

epoll

socket*    = 4
bind(4, *  = 0
listen(4, *

epoll_create            = 8
epoll_ctl(8, add, 4, *  =
epoll_wait()            = 4
accetp(4)               = 7
epoll_ctl(8, add, 7, resv*  =