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| | #ifdef __linux__
#include <ruby.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <linux/tcp.h>
#ifdef TCP_INFO
#include "my_fileno.h"
#define TCPI_ATTR_READER(x) \
static VALUE tcp_info_##x(VALUE self) \
{ \
struct tcp_info *info = DATA_PTR(self); \
return UINT2NUM((uint32_t)info->tcpi_##x); \
}
TCPI_ATTR_READER(state)
TCPI_ATTR_READER(ca_state)
TCPI_ATTR_READER(retransmits)
TCPI_ATTR_READER(probes)
TCPI_ATTR_READER(backoff)
TCPI_ATTR_READER(options)
TCPI_ATTR_READER(snd_wscale)
TCPI_ATTR_READER(rcv_wscale)
TCPI_ATTR_READER(rto)
TCPI_ATTR_READER(ato)
TCPI_ATTR_READER(snd_mss)
TCPI_ATTR_READER(rcv_mss)
TCPI_ATTR_READER(unacked)
TCPI_ATTR_READER(sacked)
TCPI_ATTR_READER(lost)
TCPI_ATTR_READER(retrans)
TCPI_ATTR_READER(fackets)
TCPI_ATTR_READER(last_data_sent)
TCPI_ATTR_READER(last_ack_sent)
TCPI_ATTR_READER(last_data_recv)
TCPI_ATTR_READER(last_ack_recv)
TCPI_ATTR_READER(pmtu)
TCPI_ATTR_READER(rcv_ssthresh)
TCPI_ATTR_READER(rtt)
TCPI_ATTR_READER(rttvar)
TCPI_ATTR_READER(snd_ssthresh)
TCPI_ATTR_READER(snd_cwnd)
TCPI_ATTR_READER(advmss)
TCPI_ATTR_READER(reordering)
TCPI_ATTR_READER(rcv_rtt)
TCPI_ATTR_READER(rcv_space)
TCPI_ATTR_READER(total_retrans)
static VALUE alloc(VALUE klass)
{
struct tcp_info *info = xmalloc(sizeof(struct tcp_info));
/* Data_Make_Struct has an extra memset 0 which is so wasteful */
return Data_Wrap_Struct(klass, NULL, -1, info);
}
/*
* call-seq:
*
* Raindrops::TCP_Info.new(tcp_socket) -> TCP_Info object
*
* Reads a TCP_Info object from any given +tcp_socket+. See the tcp(7)
* manpage and /usr/include/linux/tcp.h for more details.
*/
static VALUE init(VALUE self, VALUE io)
{
int fd = my_fileno(io);
struct tcp_info *info = DATA_PTR(self);
socklen_t len = (socklen_t)sizeof(struct tcp_info);
int rc = getsockopt(fd, IPPROTO_TCP, TCP_INFO, info, &len);
if (rc != 0)
rb_sys_fail("getsockopt");
return self;
}
void Init_raindrops_linux_tcp_info(void)
{
VALUE cRaindrops = rb_const_get(rb_cObject, rb_intern("Raindrops"));
VALUE cTCP_Info;
/*
* Document-class: Raindrops::TCP_Info
*
* This is used to wrap "struct tcp_info" as described in tcp(7)
* and /usr/include/linux/tcp.h. The following readers methods
* are defined corresponding to the "tcpi_" fields in the
* tcp_info struct.
*
* In particular, the +last_data_recv+ field is useful for measuring
* the amount of time a client spent in the listen queue before
* +accept()+, but only if +TCP_DEFER_ACCEPT+ is used with the
* listen socket (it is on by default in Unicorn).
*
* - state
* - ca_state
* - retransmits
* - probes
* - backoff
* - options
* - snd_wscale
* - rcv_wscale
* - rto
* - ato
* - snd_mss
* - rcv_mss
* - unacked
* - sacked
* - lost
* - retrans
* - fackets
* - last_data_sent
* - last_ack_sent
* - last_data_recv
* - last_ack_recv
* - pmtu
* - rcv_ssthresh
* - rtt
* - rttvar
* - snd_ssthresh
* - snd_cwnd
* - advmss
* - reordering
* - rcv_rtt
* - rcv_space
* - total_retrans
*
* http://kernel.org/doc/man-pages/online/pages/man7/tcp.7.html
*/
cTCP_Info = rb_define_class_under(cRaindrops, "TCP_Info", rb_cObject);
rb_define_alloc_func(cTCP_Info, alloc);
rb_define_private_method(cTCP_Info, "initialize", init, 1);
rb_define_method(cTCP_Info, "get!", init, 1);
#define TCPI_DEFINE_METHOD(x) \
rb_define_method(cTCP_Info, #x, tcp_info_##x, 0)
TCPI_DEFINE_METHOD(state);
TCPI_DEFINE_METHOD(ca_state);
TCPI_DEFINE_METHOD(retransmits);
TCPI_DEFINE_METHOD(probes);
TCPI_DEFINE_METHOD(backoff);
TCPI_DEFINE_METHOD(options);
TCPI_DEFINE_METHOD(snd_wscale);
TCPI_DEFINE_METHOD(rcv_wscale);
TCPI_DEFINE_METHOD(rto);
TCPI_DEFINE_METHOD(ato);
TCPI_DEFINE_METHOD(snd_mss);
TCPI_DEFINE_METHOD(rcv_mss);
TCPI_DEFINE_METHOD(unacked);
TCPI_DEFINE_METHOD(sacked);
TCPI_DEFINE_METHOD(lost);
TCPI_DEFINE_METHOD(retrans);
TCPI_DEFINE_METHOD(fackets);
TCPI_DEFINE_METHOD(last_data_sent);
TCPI_DEFINE_METHOD(last_ack_sent);
TCPI_DEFINE_METHOD(last_data_recv);
TCPI_DEFINE_METHOD(last_ack_recv);
TCPI_DEFINE_METHOD(pmtu);
TCPI_DEFINE_METHOD(rcv_ssthresh);
TCPI_DEFINE_METHOD(rtt);
TCPI_DEFINE_METHOD(rttvar);
TCPI_DEFINE_METHOD(snd_ssthresh);
TCPI_DEFINE_METHOD(snd_cwnd);
TCPI_DEFINE_METHOD(advmss);
TCPI_DEFINE_METHOD(reordering);
TCPI_DEFINE_METHOD(rcv_rtt);
TCPI_DEFINE_METHOD(rcv_space);
TCPI_DEFINE_METHOD(total_retrans);
}
#endif /* TCP_INFO */
#endif /* __linux__ */
|