epoll_create(EPOLL_CLOEXEC)                    = 6

/* 4 is a socket of HTTP_CLIENT. (got from accept4(SOCK_CLOEXEC|SOCK_NONBLOCK)) */
epoll_ctl(6, EPOLL_CTL_ADD, 4, {EPOLLIN|EPOLLOUT|EPOLLET|EPOLLRDHUP, {fd=4}}) = 0
pipe2([7, 9], O_NONBLOCK|O_CLOEXEC)     = 0

/* Creating socket for a HTTP_SERVER */
socket(PF_INET, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, IPPROTO_IP) = 10
connect(10, {sa_family=AF_INET, sin_port=htons(80), sin_addr=inet_addr("127.0.0.1")}, 16) = -1 EINPROGRESS (Operation now in progress)
epoll_ctl(6, EPOLL_CTL_ADD, 10, {EPOLLIN|EPOLLOUT|EPOLLET|0x2000, {fd=10}}) = 0
pipe2([11, 12], O_NONBLOCK|O_CLOEXEC)   = 0
epoll_wait(6, {{EPOLLOUT, {fd=4}}, {EPOLLOUT, {fd=10}}}, 100, -1) = 2
getsockopt(10, SOL_SOCKET, SO_ERROR, [0], [4]) = 0
epoll_wait(6, {{EPOLLIN|EPOLLOUT, {fd=4}}}, 100, -1) = 1
splice(4, 0, 9, 0, 65536, SPLICE_F_MOVE|SPLICE_F_NONBLOCK)    = 421
splice(7, 0, 10, 0, 0x1a5, SPLICE_F_MOVE|SPLICE_F_NONBLOCK)      = 421
epoll_wait(6, {{EPOLLIN|EPOLLOUT, {fd=10}}}, 100, -1) = 1
splice(10, 0, 12, 0, 65536, SPLICE_F_MOVE|SPLICE_F_NONBLOCK)    = 801
splice(11, 0, 4, 0, 0x321, SPLICE_F_MOVE|SPLICE_F_NONBLOCK)      = 801
epoll_wait(6, {{EPOLLIN|EPOLLOUT, {fd=4}}}, 100, -1) = 1
splice(4, 0, 9, 0, 65536, SPLICE_F_MOVE|SPLICE_F_NONBLOCK)    = 345
splice(7, 0, 10, 0, 0x159, SPLICE_F_MOVE|SPLICE_F_NONBLOCK)      = 345
epoll_wait(6, {{EPOLLIN|EPOLLOUT, {fd=10}}}, 100, -1) = 1
splice(10, 0, 12, 0, 65536, SPLICE_F_MOVE|SPLICE_F_NONBLOCK)    = 502
splice(11, 0, 4, 0, 0x1f6, SPLICE_F_MOVE|SPLICE_F_NONBLOCK)      = 502
epoll_wait(6, {{EPOLLIN|EPOLLOUT, {fd=4}}}, 100, -1) = 1
splice(4, 0, 9, 0, 65536, SPLICE_F_MOVE|SPLICE_F_NONBLOCK)    = 458
splice(7, 0, 10, 0, 0x1ca, SPLICE_F_MOVE|SPLICE_F_NONBLOCK)      = 458
epoll_wait(6, {{EPOLLIN|EPOLLOUT, {fd=10}}}, 100, -1) = 1
splice(10, 0, 12, 0, 65536, SPLICE_F_MOVE|SPLICE_F_NONBLOCK)    = 929
splice(11, 0, 4, 0, 0x3a1, SPLICE_F_MOVE|SPLICE_F_NONBLOCK)      = 929
epoll_wait(6, {{EPOLLIN|EPOLLOUT, {fd=4}}}, 100, -1) = 1
splice(4, 0, 9, 0, 65536, SPLICE_F_MOVE|SPLICE_F_NONBLOCK)    = 345
splice(7, 0, 10, 0, 0x159, SPLICE_F_MOVE|SPLICE_F_NONBLOCK)      = 345
epoll_wait(6, {{EPOLLIN|EPOLLOUT, {fd=10}}}, 100, -1) = 1
splice(10, 0, 12, 0, 65536, SPLICE_F_MOVE|SPLICE_F_NONBLOCK)    = 502
splice(11, 0, 4, 0, 0x1f6, SPLICE_F_MOVE|SPLICE_F_NONBLOCK)      = 502
epoll_wait(6, {{EPOLLIN|EPOLLOUT, {fd=4}}}, 100, -1) = 1
splice(4, 0, 9, 0, 65536, SPLICE_F_MOVE|SPLICE_F_NONBLOCK)    = 543
splice(7, 0, 10, 0, 0x21f, SPLICE_F_MOVE|SPLICE_F_NONBLOCK)      = 543
epoll_wait(6, {{EPOLLIN|EPOLLOUT, {fd=10}}}, 100, -1) = 1
splice(10, 0, 12, 0, 65536, SPLICE_F_MOVE|SPLICE_F_NONBLOCK)    = 348
splice(11, 0, 4, 0, 0x15c, SPLICE_F_MOVE|SPLICE_F_NONBLOCK)      = 348
epoll_wait(6, {{EPOLLIN|EPOLLOUT, {fd=4}}}, 100, -1) = 1
splice(4, 0, 9, 0, 65536, SPLICE_F_MOVE|SPLICE_F_NONBLOCK)    = 543
splice(7, 0, 10, 0, 0x21f, SPLICE_F_MOVE|SPLICE_F_NONBLOCK)      = 543
epoll_wait(6, {{EPOLLIN|EPOLLOUT, {fd=10}}}, 100, -1) = 1
splice(10, 0, 12, 0, 65536, SPLICE_F_MOVE|SPLICE_F_NONBLOCK)    = 38787
splice(11, 0, 4, 0, 0x9783, SPLICE_F_MOVE|SPLICE_F_NONBLOCK)     = 38787
epoll_wait(6, {{EPOLLIN|EPOLLOUT, {fd=4}}}, 100, -1) = 1
splice(4, 0, 9, 0, 65536, SPLICE_F_MOVE|SPLICE_F_NONBLOCK)    = 345
splice(7, 0, 10, 0, 0x159, SPLICE_F_MOVE|SPLICE_F_NONBLOCK)      = 345
epoll_wait(6, {{EPOLLIN|EPOLLOUT, {fd=10}}}, 100, -1) = 1
splice(10, 0, 12, 0, 65536, SPLICE_F_MOVE|SPLICE_F_NONBLOCK)    = 502
splice(11, 0, 4, 0, 0x1f6, SPLICE_F_MOVE|SPLICE_F_NONBLOCK)      = 502
epoll_wait(6, {{EPOLLIN|EPOLLOUT, {fd=4}}}, 100, -1) = 1
splice(4, 0, 9, 0, 65536, SPLICE_F_MOVE|SPLICE_F_NONBLOCK)    = 519
splice(7, 0, 10, 0, 0x207, SPLICE_F_MOVE|SPLICE_F_NONBLOCK)      = 519
epoll_wait(6, {{EPOLLIN|EPOLLOUT, {fd=10}}}, 100, -1) = 1
splice(10, 0, 12, 0, 65536, SPLICE_F_MOVE|SPLICE_F_NONBLOCK)    = 49152
splice(11, 0, 4, 0, 0xc000, SPLICE_F_MOVE|SPLICE_F_NONBLOCK)     = 49152
epoll_wait(6, {{EPOLLIN|EPOLLOUT, {fd=10}}}, 100, -1) = 1
splice(10, 0, 12, 0, 65536, SPLICE_F_MOVE|SPLICE_F_NONBLOCK)    = 49448
splice(11, 0, 4, 0, 0xc128, SPLICE_F_MOVE|SPLICE_F_NONBLOCK)     = 49448
epoll_wait(6, {{EPOLLIN|EPOLLOUT, {fd=10}}}, 100, -1) = 1
splice(10, 0, 12, 0, 65536, SPLICE_F_MOVE|SPLICE_F_NONBLOCK)    = 53248
splice(11, 0, 4, 0, 53248, SPLICE_F_MOVE|SPLICE_F_NONBLOCK)     = 32472
epoll_wait(6, {{EPOLLOUT, {fd=4}}}, 100, -1) = 1
splice(11, 0, 4, 0, 20776, SPLICE_F_MOVE|SPLICE_F_NONBLOCK)     = 20776
epoll_wait(6, +++ killed by SIGINT +++