event.c File Reference

#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/time.h>
#include <netdb.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "internal.h"
#include "tvarith.h"

Include dependency graph for event.c:

Go to the source code of this file.

Functions
static void	tcp_close (adns_state ads)
void	adns__tcp_broken (adns_state ads, const char *what, const char *why)
static void	tcp_connected (adns_state ads, struct timeval now)
void	adns__tcp_tryconnect (adns_state ads, struct timeval now)
void	adns__must_gettimeofday (adns_state ads, const struct timeval **now_io, struct timeval *tv_buf)
static void	inter_immed (struct timeval **tv_io, struct timeval *tvbuf)
static void	inter_maxto (struct timeval **tv_io, struct timeval *tvbuf, struct timeval maxto)
static void	inter_maxtoabs (struct timeval **tv_io, struct timeval *tvbuf, struct timeval now, struct timeval maxtime)
static void	timeouts_queue (adns_state ads, int act, struct timeval **tv_io, struct timeval *tvbuf, struct timeval now, struct query_queue *queue)
static void	tcp_events (adns_state ads, int act, struct timeval **tv_io, struct timeval *tvbuf, struct timeval now)
void	adns__timeouts (adns_state ads, int act, struct timeval **tv_io, struct timeval *tvbuf, struct timeval now)
void	adns_firsttimeout (adns_state ads, struct timeval **tv_io, struct timeval *tvbuf, struct timeval now)
void	adns_processtimeouts (adns_state ads, const struct timeval *now)
int	adns__pollfds (adns_state ads, struct pollfd pollfds_buf[MAX_POLLFDS])
int	adns_processreadable (adns_state ads, ADNS_SOCKET fd, const struct timeval *now)
int	adns_processwriteable (adns_state ads, ADNS_SOCKET fd, const struct timeval *now)
int	adns_processexceptional (adns_state ads, ADNS_SOCKET fd, const struct timeval *now)
static void	fd_event (adns_state ads, ADNS_SOCKET fd, int revent, int pollflag, int maxfd, const fd_set *fds, int(*func)(adns_state, ADNS_SOCKET fd, const struct timeval *now), struct timeval now, int *r_r)
void	adns__fdevents (adns_state ads, const struct pollfd *pollfds, int npollfds, int maxfd, const fd_set *readfds, const fd_set *writefds, const fd_set *exceptfds, struct timeval now, int *r_r)
void	adns_beforeselect (adns_state ads, int *maxfd_io, fd_set *readfds_io, fd_set *writefds_io, fd_set *exceptfds_io, struct timeval **tv_mod, struct timeval *tv_tobuf, const struct timeval *now)
void	adns_afterselect (adns_state ads, int maxfd, const fd_set *readfds, const fd_set *writefds, const fd_set *exceptfds, const struct timeval *now)
void	adns_globalsystemfailure (adns_state ads)
int	adns_processany (adns_state ads)
void	adns__autosys (adns_state ads, struct timeval now)
int	adns__internal_check (adns_state ads, adns_query *query_io, adns_answer **answer, void **context_r)
int	adns_wait (adns_state ads, adns_query *query_io, adns_answer **answer_r, void **context_r)
int	adns_check (adns_state ads, adns_query *query_io, adns_answer **answer_r, void **context_r)

Function Documentation

adns__autosys()

void adns__autosys	(	adns_state	ads,
		struct timeval	now
	)

Definition at line 665 of file event.c.

                                                       {
  if (ads->iflags & adns_if_noautosys) return;
  adns_processany(ads);
}

Referenced by adns_check(), and adns_submit().

adns__fdevents()

void adns__fdevents	(	adns_state	ads,
		const struct pollfd *	pollfds,
		int	npollfds,
		int	maxfd,
		const fd_set *	readfds,
		const fd_set *	writefds,
		const fd_set *	exceptfds,
		struct timeval	now,
		int *	r_r
	)

Definition at line 542 of file event.c.

                                          {
  int i, revents;
  ADNS_SOCKET fd;
 
  for (i=0; i<npollfds; i++) {
    fd= pollfds[i].fd;
    if ((int)fd >= maxfd) maxfd= fd+1;
    revents= pollfds[i].revents;
    fd_event(ads,fd, revents,POLLIN, maxfd,readfds, adns_processreadable,now,r_r);
    fd_event(ads,fd, revents,POLLOUT, maxfd,writefds, adns_processwriteable,now,r_r);
    fd_event(ads,fd, revents,POLLPRI, maxfd,exceptfds, adns_processexceptional,now,r_r);
  }
}

Referenced by adns_afterselect(), and adns_processany().

adns__internal_check()

int adns__internal_check	(	adns_state	ads,
		adns_query *	query_io,
		adns_answer **	answer,
		void **	context_r
	)

Definition at line 670 of file event.c.

                               {
  adns_query qu;
 
  qu= *query_io;
  if (!qu) {
    if (ads->output.head) {
      qu= ads->output.head;
    } else if (ads->udpw.head || ads->tcpw.head) {
      return EAGAIN;
    } else {
      return ESRCH;
    }
  } else {
    if (qu->id>=0) return EAGAIN;
  }
  LIST_UNLINK(ads->output,qu);
  *answer= qu->answer;
  if (context_r) *context_r= qu->ctx.ext;
  *query_io= qu;
  free(qu);
  return 0;
}

Referenced by adns_check(), and adns_wait().

adns__must_gettimeofday()

void adns__must_gettimeofday	(	adns_state	ads,
		const struct timeval **	now_io,
		struct timeval *	tv_buf
	)

Definition at line 149 of file event.c.

                                         {
  const struct timeval *now;
  int r;
 
  now= *now_io;
  if (now) return;
  r= gettimeofday(tv_buf,0); if (!r) { *now_io= tv_buf; return; }
  adns__diag(ads,-1,0,"gettimeofday failed: %s",strerror(errno));
  adns_globalsystemfailure(ads);
  return;
}

Referenced by adns_afterselect(), adns_beforeselect(), and adns_processtimeouts().

adns__pollfds()

int adns__pollfds	(	adns_state	ads,
		struct pollfd	pollfds_buf[MAX_POLLFDS]
	)

Definition at line 312 of file event.c.

                                                                          {
  /* Returns the number of entries filled in.  Always zeroes revents. */
 
  assert(MAX_POLLFDS==2);
 
  pollfds_buf[0].fd= ads->udpsocket;
  pollfds_buf[0].events= POLLIN;
  pollfds_buf[0].revents= 0;
 
  switch (ads->tcpstate) {
  case server_disconnected:
  case server_broken:
    return 1;
  case server_connecting:
    pollfds_buf[1].events= POLLOUT;
    break;
  case server_ok:
    pollfds_buf[1].events= ads->tcpsend.used ? POLLIN|POLLOUT|POLLPRI : POLLIN|POLLPRI;
    break;
  default:
    abort();
  }
  pollfds_buf[1].fd= ads->tcpsocket;
  return 2;
}

Referenced by adns_afterselect(), adns_beforeselect(), and adns_processany().

adns__tcp_broken()

void adns__tcp_broken	(	adns_state	ads,
		const char *	what,
		const char *	why
	)

Definition at line 59 of file event.c.

                                                                         {
  int serv;
  adns_query qu;
 
  assert(ads->tcpstate == server_connecting || ads->tcpstate == server_ok);
  serv= ads->tcpserver;
  if (what) adns__warn(ads,serv,0,"TCP connection failed: %s: %s",what,why);
 
  if (ads->tcpstate == server_connecting) {
    /* Counts as a retry for all the queries waiting for TCP. */
    for (qu= ads->tcpw.head; qu; qu= qu->next)
      qu->retries++;
  }
 
  tcp_close(ads);
  ads->tcpstate= server_broken;
  ads->tcpserver= (serv+1)%ads->nservers;
}

Referenced by adns__querysend_tcp(), adns__tcp_tryconnect(), adns_globalsystemfailure(), adns_processexceptional(), adns_processreadable(), adns_processwriteable(), and tcp_events().

adns__tcp_tryconnect()

void adns__tcp_tryconnect	(	adns_state	ads,
		struct timeval	now
	)

Definition at line 90 of file event.c.

                                                              {
  int r, tries;
  ADNS_SOCKET fd;
  struct sockaddr_in addr;
  struct protoent *proto;
 
  for (tries=0; tries<ads->nservers; tries++) {
    switch (ads->tcpstate) {
    case server_connecting:
    case server_ok:
    case server_broken:
      return;
    case server_disconnected:
      break;
    default:
      abort();
    }
 
    assert(!ads->tcpsend.used);
    assert(!ads->tcprecv.used);
    assert(!ads->tcprecv_skip);
 
    proto= getprotobyname("tcp");
    if (!proto) { adns__diag(ads,-1,0,"unable to find protocol no. for TCP !"); return; }
    ADNS_CLEAR_ERRNO
    fd= socket(AF_INET,SOCK_STREAM,proto->p_proto);
    ADNS_CAPTURE_ERRNO;
    if (fd<0) {
      adns__diag(ads,-1,0,"cannot create TCP socket: %s",strerror(errno));
      return;
    }
    r= adns__setnonblock(ads,fd);
    if (r) {
      adns__diag(ads,-1,0,"cannot make TCP socket nonblocking: %s",strerror(r));
      adns_socket_close(fd);
      return;
    }
    memset(&addr,0,sizeof(addr));
    addr.sin_family= AF_INET;
    addr.sin_port= htons(DNS_PORT);
    addr.sin_addr= ads->servers[ads->tcpserver].addr;
    ADNS_CLEAR_ERRNO;
    r= connect(fd,(const struct sockaddr*)&addr,sizeof(addr));
    ADNS_CAPTURE_ERRNO;
    ads->tcpsocket= fd;
    ads->tcpstate= server_connecting;
    if (r==0) { tcp_connected(ads,now); return; }
    if (errno == EWOULDBLOCK || errno == EINPROGRESS) {
      ads->tcptimeout= now;
      timevaladd(&ads->tcptimeout,TCPCONNMS);
      return;
    }
    adns__tcp_broken(ads,"connect",strerror(errno));
    ads->tcpstate= server_disconnected;
  }
}

Referenced by query_usetcp(), and tcp_events().

adns__timeouts()

void adns__timeouts	(	adns_state	ads,
		int	act,
		struct timeval **	tv_io,
		struct timeval *	tvbuf,
		struct timeval	now
	)

Definition at line 283 of file event.c.

                                {
  timeouts_queue(ads,act,tv_io,tvbuf,now, &ads->udpw);
  timeouts_queue(ads,act,tv_io,tvbuf,now, &ads->tcpw);
  tcp_events(ads,act,tv_io,tvbuf,now);
}

Referenced by adns_beforeselect(), adns_firsttimeout(), and adns_processtimeouts().

adns_afterselect()

void adns_afterselect	(	adns_state	ads,
		int	maxfd,
		const fd_set *	readfds,
		const fd_set *	writefds,
		const fd_set *	exceptfds,
		const struct timeval *	now
	)

Definition at line 595 of file event.c.

                                         {
  struct timeval tv_buf;
  struct pollfd pollfds[MAX_POLLFDS];
  int npollfds, i;
 
  adns__consistency(ads,0,cc_entex);
  adns__must_gettimeofday(ads,&now,&tv_buf);
  if (!now) goto xit;
  adns_processtimeouts(ads,now);
 
  npollfds= adns__pollfds(ads,pollfds);
  for (i=0; i<npollfds; i++) pollfds[i].revents= POLLIN|POLLOUT|POLLPRI;
  adns__fdevents(ads,
         pollfds,npollfds,
         maxfd,readfds,writefds,exceptfds,
         *now, 0);
xit:
  adns__consistency(ads,0,cc_entex);
}

Referenced by adns_wait(), and main().

adns_beforeselect()

void adns_beforeselect	(	adns_state	ads,
		int *	maxfd_io,
		fd_set *	readfds_io,
		fd_set *	writefds_io,
		fd_set *	exceptfds_io,
		struct timeval **	tv_mod,
		struct timeval *	tv_tobuf,
		const struct timeval *	now
	)

Definition at line 562 of file event.c.

                                          {
  struct timeval tv_nowbuf;
  struct pollfd pollfds[MAX_POLLFDS];
  int i, maxfd, npollfds;
  ADNS_SOCKET fd;
 
  adns__consistency(ads,0,cc_entex);
 
  if (tv_mod && (!*tv_mod || (*tv_mod)->tv_sec || (*tv_mod)->tv_usec)) {
    /* The caller is planning to sleep. */
    adns__must_gettimeofday(ads,&now,&tv_nowbuf);
    if (!now) { inter_immed(tv_mod,tv_tobuf); goto xit; }
    adns__timeouts(ads, 0, tv_mod,tv_tobuf, *now);
  }
 
  npollfds= adns__pollfds(ads,pollfds);
  maxfd= *maxfd_io;
  for (i=0; i<npollfds; i++) {
    fd= pollfds[i].fd;
    if ((int)fd >= maxfd) maxfd= fd+1;
    if (pollfds[i].events & POLLIN) FD_SET(fd,readfds_io);
    if (pollfds[i].events & POLLOUT) FD_SET(fd,writefds_io);
    if (pollfds[i].events & POLLPRI) FD_SET(fd,exceptfds_io);
  }
  *maxfd_io= maxfd;
 
xit:
  adns__consistency(ads,0,cc_entex);
}

Referenced by adns_wait(), and main().

adns_check()

int adns_check	(	adns_state	ads,
		adns_query *	query_io,
		adns_answer **	answer_r,
		void **	context_r
	)

Definition at line 731 of file event.c.

                             {
  struct timeval now;
  int r;
 
  adns__consistency(ads,*query_io,cc_entex);
  r= gettimeofday(&now,0);
  if (!r) adns__autosys(ads,now);
 
  r= adns__internal_check(ads,query_io,answer_r,context_r);
  adns__consistency(ads,0,cc_entex);
  return r;
}

Referenced by checkadnsqueries(), main(), and proclog().

adns_firsttimeout()

void adns_firsttimeout	(	adns_state	ads,
		struct timeval **	tv_io,
		struct timeval *	tvbuf,
		struct timeval	now
	)

Definition at line 291 of file event.c.

                                   {
  adns__consistency(ads,0,cc_entex);
  adns__timeouts(ads, 0, tv_io,tvbuf, now);
  adns__consistency(ads,0,cc_entex);
}

adns_globalsystemfailure()

void adns_globalsystemfailure

(

adns_state

ads

)

Definition at line 619 of file event.c.

                                              {
  adns__consistency(ads,0,cc_entex);
 
  while (ads->udpw.head) adns__query_fail(ads->udpw.head, adns_s_systemfail);
  while (ads->tcpw.head) adns__query_fail(ads->tcpw.head, adns_s_systemfail);
 
  switch (ads->tcpstate) {
  case server_connecting:
  case server_ok:
    adns__tcp_broken(ads,0,0);
    break;
  case server_disconnected:
  case server_broken:
    break;
  default:
    abort();
  }
  adns__consistency(ads,0,cc_entex);
}

Referenced by adns__must_gettimeofday(), adns_wait(), and fd_event().

adns_processany()

int adns_processany

(

adns_state

ads

)

Definition at line 639 of file event.c.

                                    {
  int r, i;
  struct timeval now;
  struct pollfd pollfds[MAX_POLLFDS];
  int npollfds;
 
  adns__consistency(ads,0,cc_entex);
 
  r= gettimeofday(&now,0);
  if (!r) adns_processtimeouts(ads,&now);
 
  /* We just use adns__fdevents to loop over the fd's trying them.
   * This seems more sensible than calling select, since we're most
   * likely just to want to do a adns_socket_read on one or two fds anyway.
   */
  npollfds= adns__pollfds(ads,pollfds);
  for (i=0; i<npollfds; i++) pollfds[i].revents= pollfds[i].events & ~POLLPRI;
  adns__fdevents(ads,
         pollfds,npollfds,
         0,0,0,0,
         now,&r);
 
  adns__consistency(ads,0,cc_entex);
  return 0;
}

Referenced by adns__autosys().

adns_processexceptional()

int adns_processexceptional	(	adns_state	ads,
		ADNS_SOCKET	fd,
		const struct timeval *	now
	)

Definition at line 504 of file event.c.

                                                                                       {
  adns__consistency(ads,0,cc_entex);
  switch (ads->tcpstate) {
  case server_disconnected:
  case server_broken:
    break;
  case server_connecting:
  case server_ok:
    if (fd != ads->tcpsocket) break;
    adns__tcp_broken(ads,"poll/select","exceptional condition detected");
    break;
  default:
    abort();
  }
  adns__consistency(ads,0,cc_entex);
  return 0;
}

Referenced by adns__fdevents().

adns_processreadable()

int adns_processreadable	(	adns_state	ads,
		ADNS_SOCKET	fd,
		const struct timeval *	now
	)

Definition at line 338 of file event.c.

                                                                                    {
  int want, dgramlen, r, udpaddrlen, serv, old_skip;
  byte udpbuf[DNS_MAXUDP];
  struct sockaddr_in udpaddr;
 
  adns__consistency(ads,0,cc_entex);
 
  switch (ads->tcpstate) {
  case server_disconnected:
  case server_broken:
  case server_connecting:
    break;
  case server_ok:
    if (fd != ads->tcpsocket) break;
    assert(!ads->tcprecv_skip);
    do {
      if (ads->tcprecv.used >= ads->tcprecv_skip+2) {
    dgramlen= ((ads->tcprecv.buf[ads->tcprecv_skip]<<8) |
               ads->tcprecv.buf[ads->tcprecv_skip+1]);
    if (ads->tcprecv.used >= ads->tcprecv_skip+2+dgramlen) {
      old_skip= ads->tcprecv_skip;
      ads->tcprecv_skip += 2+dgramlen;
      adns__procdgram(ads, ads->tcprecv.buf+old_skip+2,
              dgramlen, ads->tcpserver, 1,*now);
      continue;
    } else {
      want= 2+dgramlen;
    }
      } else {
    want= 2;
      }
      ads->tcprecv.used -= ads->tcprecv_skip;
      memmove(ads->tcprecv.buf,ads->tcprecv.buf+ads->tcprecv_skip, (size_t) ads->tcprecv.used);
      ads->tcprecv_skip= 0;
      if (!adns__vbuf_ensure(&ads->tcprecv,want)) { r= ENOMEM; goto xit; }
      assert(ads->tcprecv.used <= ads->tcprecv.avail);
      if (ads->tcprecv.used == ads->tcprecv.avail) continue;
      ADNS_CLEAR_ERRNO;
      r= adns_socket_read(ads->tcpsocket,
          ads->tcprecv.buf+ads->tcprecv.used,
          ads->tcprecv.avail-ads->tcprecv.used);
      ADNS_CAPTURE_ERRNO;
      if (r>0) {
    ads->tcprecv.used+= r;
      } else {
    if (r) {
      if (errno==EAGAIN || errno==EWOULDBLOCK) { r= 0; goto xit; }
      if (errno==EINTR) continue;
      if (errno_resources(errno)) { r= errno; goto xit; }
    }
    adns__tcp_broken(ads,"adns_socket_read",r?strerror(errno):"closed");
      }
    } while (ads->tcpstate == server_ok);
    r= 0; goto xit;
  default:
    abort();
  }
  if (fd == ads->udpsocket) {
    for (;;) {
      udpaddrlen= sizeof(udpaddr);
      ADNS_CLEAR_ERRNO;
      r= recvfrom(ads->udpsocket,(char*)udpbuf,sizeof(udpbuf),0,
          (struct sockaddr*)&udpaddr,&udpaddrlen);
      ADNS_CAPTURE_ERRNO;
      if (r<0) {
    if (errno == EAGAIN || errno == EWOULDBLOCK || errno == ECONNRESET) { r= 0; goto xit; }
    if (errno == EINTR) continue;
    if (errno_resources(errno)) { r= errno; goto xit; }
    adns__warn(ads,-1,0,"datagram receive error: %s (%d)",strerror(errno), errno);
    r= 0; goto xit;
      }
      if (udpaddrlen != sizeof(udpaddr)) {
    adns__diag(ads,-1,0,"datagram received with wrong address length %d"
           " (expected %lu)", udpaddrlen,
           (unsigned long)sizeof(udpaddr));
    continue;
      }
      if (udpaddr.sin_family != AF_INET) {
    adns__diag(ads,-1,0,"datagram received with wrong protocol family"
           " %u (expected %u)",udpaddr.sin_family,AF_INET);
    continue;
      }
      if (ntohs(udpaddr.sin_port) != DNS_PORT) {
    adns__diag(ads,-1,0,"datagram received from wrong port %u (expected %u)",
           ntohs(udpaddr.sin_port),DNS_PORT);
    continue;
      }
      for (serv= 0;
       serv < ads->nservers &&
         ads->servers[serv].addr.s_addr != udpaddr.sin_addr.s_addr;
       serv++);
      if (serv >= ads->nservers) {
    adns__warn(ads,-1,0,"datagram received from unknown nameserver %s",
           inet_ntoa(udpaddr.sin_addr));
    continue;
      }
      adns__procdgram(ads,udpbuf,r,serv,0,*now);
    }
  }
  r= 0;
xit:
  adns__consistency(ads,0,cc_entex);
  return r;
}

Referenced by adns__fdevents().

adns_processtimeouts()

void adns_processtimeouts	(	adns_state	ads,
		const struct timeval *	now
	)

Definition at line 299 of file event.c.

                                                                     {
  struct timeval tv_buf;
 
  adns__consistency(ads,0,cc_entex);
  adns__must_gettimeofday(ads,&now,&tv_buf);
  if (now) adns__timeouts(ads, 1, 0,0, *now);
  adns__consistency(ads,0,cc_entex);
}

Referenced by adns_afterselect(), and adns_processany().

adns_processwriteable()

int adns_processwriteable	(	adns_state	ads,
		ADNS_SOCKET	fd,
		const struct timeval *	now
	)

Definition at line 443 of file event.c.

                                                                                     {
  int r;
 
  adns__consistency(ads,0,cc_entex);
 
  switch (ads->tcpstate) {
  case server_disconnected:
  case server_broken:
    break;
  case server_connecting:
    if (fd != ads->tcpsocket) break;
    assert(ads->tcprecv.used==0);
    assert(ads->tcprecv_skip==0);
    for (;;) {
      if (!adns__vbuf_ensure(&ads->tcprecv,1)) { r= ENOMEM; goto xit; }
      ADNS_CLEAR_ERRNO;
      r= adns_socket_read(ads->tcpsocket,&ads->tcprecv.buf,1);
      ADNS_CAPTURE_ERRNO;
      if (r==0 || (r<0 && (errno==EAGAIN || errno==EWOULDBLOCK))) {
    tcp_connected(ads,*now);
    r= 0; goto xit;
      }
      if (r>0) {
    adns__tcp_broken(ads,"connect/adns_socket_read","sent data before first request");
    r= 0; goto xit;
      }
      if (errno==EINTR) continue;
      if (errno_resources(errno)) { r= errno; goto xit; }
      adns__tcp_broken(ads,"connect/adns_socket_read",strerror(errno));
      r= 0; goto xit;
    } /* not reached */
  case server_ok:
    if (fd != ads->tcpsocket) break;
    while (ads->tcpsend.used) {
      adns__sigpipe_protect(ads);
      ADNS_CLEAR_ERRNO;
      r= adns_socket_write(ads->tcpsocket,ads->tcpsend.buf,ads->tcpsend.used);
      ADNS_CAPTURE_ERRNO;
      adns__sigpipe_unprotect(ads);
      if (r<0) {
    if (errno==EINTR) continue;
    if (errno==EAGAIN || errno==EWOULDBLOCK) { r= 0; goto xit; }
    if (errno_resources(errno)) { r= errno; goto xit; }
    adns__tcp_broken(ads,"adns_socket_write",strerror(errno));
    r= 0; goto xit;
      } else if (r>0) {
    ads->tcpsend.used -= r;
    memmove(ads->tcpsend.buf,ads->tcpsend.buf+r, (size_t) ads->tcpsend.used);
      }
    }
    r= 0;
    goto xit;
  default:
    abort();
  }
  r= 0;
xit:
  adns__consistency(ads,0,cc_entex);
  return r;
}

Referenced by adns__fdevents().

adns_wait()

int adns_wait	(	adns_state	ads,
		adns_query *	query_io,
		adns_answer **	answer_r,
		void **	context_r
	)

Definition at line 696 of file event.c.

                            {
  int r, maxfd, rsel;
  fd_set readfds, writefds, exceptfds;
  struct timeval tvbuf, *tvp;
 
  adns__consistency(ads,*query_io,cc_entex);
  for (;;) {
    r= adns__internal_check(ads,query_io,answer_r,context_r);
    if (r != EAGAIN) break;
    maxfd= 0; tvp= 0;
    FD_ZERO(&readfds); FD_ZERO(&writefds); FD_ZERO(&exceptfds);
    adns_beforeselect(ads,&maxfd,&readfds,&writefds,&exceptfds,&tvp,&tvbuf,0);
    assert(tvp);
    ADNS_CLEAR_ERRNO;
    rsel= select(maxfd,&readfds,&writefds,&exceptfds,tvp);
    ADNS_CAPTURE_ERRNO;
    if (rsel==-1) {
      if (errno == EINTR) {
    if (ads->iflags & adns_if_eintr) { r= EINTR; break; }
      } else {
    adns__diag(ads,-1,0,"select failed in wait: %s",strerror(errno));
    adns_globalsystemfailure(ads);
      }
    } else {
      assert(rsel >= 0);
      adns_afterselect(ads,maxfd,&readfds,&writefds,&exceptfds,0);
    }
  }
  adns__consistency(ads,0,cc_entex);
  return r;
}

Referenced by adns_synchronous(), main(), and proclog().

fd_event()

static void fd_event ( adns_state  ads, ADNS_SOCKET  fd, int  revent, int  pollflag, int  maxfd, const fd_set *  fds, int(*)(adns_state, ADNS_SOCKET fd, const struct timeval *now)  func, struct timeval  now, int *  r_r  )

static

Definition at line 522 of file event.c.

                                           {
  int r;
 
  if (!(revent & pollflag)) return;
  if (fds && !((int)fd<maxfd && FD_ISSET(fd,fds))) return;
  r= func(ads,fd,&now);
  if (r) {
    if (r_r) {
      *r_r= r;
    } else {
      adns__diag(ads,-1,0,"process fd failed after select: %s",strerror(errno));
      adns_globalsystemfailure(ads);
    }
  }
}

Referenced by adns__fdevents().

inter_immed()

static void inter_immed ( struct timeval **  tv_io, struct timeval *  tvbuf  )

static

Definition at line 162 of file event.c.

                                                                       {
  struct timeval *rbuf;
 
  if (!tv_io) return;
 
  rbuf= *tv_io;
  if (!rbuf) { *tv_io= rbuf= tvbuf; }
 
  timerclear(rbuf);
}

Referenced by adns_beforeselect(), tcp_events(), and timeouts_queue().

inter_maxto()

static void inter_maxto ( struct timeval **  tv_io, struct timeval *  tvbuf, struct timeval  maxto  )

static

Definition at line 173 of file event.c.

                                  {
  struct timeval *rbuf;
 
  if (!tv_io) return;
  rbuf= *tv_io;
  if (!rbuf) {
    *tvbuf= maxto; *tv_io= tvbuf;
  } else {
    if (timercmp(rbuf,&maxto,>)) *rbuf= maxto;
  }
/*fprintf(stderr,"inter_maxto maxto=%ld.%06ld result=%ld.%06ld\n",
    maxto.tv_sec,maxto.tv_usec,(**tv_io).tv_sec,(**tv_io).tv_usec);*/
}

Referenced by inter_maxtoabs().

inter_maxtoabs()

static void inter_maxtoabs ( struct timeval **  tv_io, struct timeval *  tvbuf, struct timeval  now, struct timeval  maxtime  )

static

Definition at line 188 of file event.c.

                                                           {
  /* tv_io may be 0 */
  ldiv_t dr;
 
/*fprintf(stderr,"inter_maxtoabs now=%ld.%06ld maxtime=%ld.%06ld\n",
    now.tv_sec,now.tv_usec,maxtime.tv_sec,maxtime.tv_usec);*/
  if (!tv_io) return;
  maxtime.tv_sec -= (now.tv_sec+2);
  maxtime.tv_usec -= (now.tv_usec-2000000);
  dr= ldiv(maxtime.tv_usec,1000000);
  maxtime.tv_sec += dr.quot;
  maxtime.tv_usec -= dr.quot*1000000;
  if (maxtime.tv_sec<0) timerclear(&maxtime);
  inter_maxto(tv_io,tvbuf,maxtime);
}

Referenced by tcp_events(), and timeouts_queue().

tcp_close()

static void tcp_close ( adns_state  ads )

static

Definition at line 50 of file event.c.

                                      {
  int serv;
 
  serv= ads->tcpserver;
  adns_socket_close(ads->tcpsocket);
  ads->tcpsocket= -1;
  ads->tcprecv.used= ads->tcprecv_skip= ads->tcpsend.used= 0;
}

Referenced by adns__tcp_broken(), and tcp_events().

tcp_connected()

static void tcp_connected ( adns_state  ads, struct timeval  now  )

static

Definition at line 78 of file event.c.

                                                              {
  adns_query qu, nqu;
 
  adns__debug(ads,ads->tcpserver,0,"TCP connected");
  ads->tcpstate= server_ok;
  for (qu= ads->tcpw.head; qu && ads->tcpstate == server_ok; qu= nqu) {
    nqu= qu->next;
    assert(qu->state == query_tcpw);
    adns__querysend_tcp(qu,now);
  }
}

Referenced by adns__tcp_tryconnect(), and adns_processwriteable().

tcp_events()

static void tcp_events ( adns_state  ads, int  act, struct timeval **  tv_io, struct timeval *  tvbuf, struct timeval  now  )

static

Definition at line 227 of file event.c.

                                   {
  adns_query qu, nqu;
 
  for (;;) {
    switch (ads->tcpstate) {
    case server_broken:
      if (!act) { inter_immed(tv_io,tvbuf); return; }
      for (qu= ads->tcpw.head; qu; qu= nqu) {
    nqu= qu->next;
    assert(qu->state == query_tcpw);
    if (qu->retries > ads->nservers) {
      LIST_UNLINK(ads->tcpw,qu);
      adns__query_fail(qu,adns_s_allservfail);
    }
      }
      ads->tcpstate= server_disconnected;
    case server_disconnected: /* fall through */
      if (!ads->tcpw.head) return;
      if (!act) { inter_immed(tv_io,tvbuf); return; }
      adns__tcp_tryconnect(ads,now);
      break;
    case server_ok:
      if (ads->tcpw.head) return;
      if (!ads->tcptimeout.tv_sec) {
    assert(!ads->tcptimeout.tv_usec);
    ads->tcptimeout= now;
    timevaladd(&ads->tcptimeout,TCPIDLEMS);
      }
    case server_connecting: /* fall through */
      if (!act || !timercmp(&now,&ads->tcptimeout,>)) {
    inter_maxtoabs(tv_io,tvbuf,now,ads->tcptimeout);
    return;
      } {
    /* TCP timeout has happened */
    switch (ads->tcpstate) {
    case server_connecting: /* failed to connect */
      adns__tcp_broken(ads,"unable to make connection","timed out");
      break;
    case server_ok: /* idle timeout */
      tcp_close(ads);
      ads->tcpstate= server_disconnected;
      return;
    default:
      abort();
    }
      }
      break;
    default:
      abort();
    }
  }
  return;
}

Referenced by adns__timeouts().

timeouts_queue()

static void timeouts_queue ( adns_state  ads, int  act, struct timeval **  tv_io, struct timeval *  tvbuf, struct timeval  now, struct query_queue *  queue  )

static

Definition at line 205 of file event.c.

                                                              {
  adns_query qu, nqu;
 
  for (qu= queue->head; qu; qu= nqu) {
    nqu= qu->next;
    if (!timercmp(&now,&qu->timeout,>)) {
      inter_maxtoabs(tv_io,tvbuf,now,qu->timeout);
    } else {
      if (!act) { inter_immed(tv_io,tvbuf); return; }
      LIST_UNLINK(*queue,qu);
      if (qu->state != query_tosend) {
    adns__query_fail(qu,adns_s_timeout);
      } else {
    adns__query_send(qu,now);
      }
      nqu= queue->head;
    }
  }
}

Referenced by adns__timeouts().