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DEV: poll: make the connect() step an action as well 

Now the connect() step becomes an action. It's still implicit before
any -c/-s but it allows the listener to close() before connect()
happens, showing the polling status for this condition:

  $ dev/poll/poll -v -l clo -c pol
  #### BEGIN ####
  cmd #1 stp #1: do_clo(3): ret=0
  cmd #2 stp #0: do_con(4): ret=-1 (Connection refused)
  cmd #2 stp #1: do_pol(4): ret=1 ev=0x14 (OUT HUP)
  #### END ####

which differs from a case where the server closes the just accepted
connection:

  $ dev/poll/poll -v -s clo -c pol
  #### BEGIN ####
  cmd #1 stp #0: do_con(4): ret=0
  cmd #1 stp #0: do_acc(3): ret=5
  cmd #1 stp #1: do_clo(5): ret=0
  cmd #2 stp #1: do_pol(4): ret=1 ev=0x2005 (IN OUT RDHUP)
  #### END ####

It's interesting to see OUT+HUP since HUP indicates that both directions
were closed, hence nothing may be written now, thus OUT just wants the
write handler to be notified.
This commit is contained in:
Willy Tarreau 2022-11-17 07:44:27 +01:00
parent 2fd6dbfb0d
commit e61064162b
1 changed files with 23 additions and 7 deletions
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30
dev/poll/poll.c
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@ -32,6 +32,7 @@ int one = 1;
int lfd = -1;
int cfd = -1;
int sfd = -1;
int connected = 0;
struct sockaddr_in saddr, caddr;
socklen_t salen, calen;
@ -46,6 +47,7 @@ void usage(const char *arg0)
" -l <actions> perform <action> on listening socket\n"
"\n"
"actions for -c/-s/-l (multiple may be delimited by commas) :\n"
" con connect to listener, implicit before first -c/-s\n"
" acc accept on listener, implicit before first -s\n"
" snd send a few bytes of data\n"
" mor send a few bytes of data with MSG_MORE\n"
@ -90,6 +92,16 @@ void do_acc(int fd)
printf("cmd #%d stp #%d: %s(%d): ret=%d%s\n", cmd, cmdstep, __FUNCTION__, fd, ret, get_errno(ret));
}
void do_con(int fd)
{
int ret;
ret = connect(cfd, (const struct sockaddr*)&saddr, salen);
if (verbose)
printf("cmd #%d stp #%d: %s(%d): ret=%d%s\n", cmd, cmdstep, __FUNCTION__, fd, ret, get_errno(ret));
connected = 1;
}
void do_snd(int fd)
{
int ret;
@ -251,13 +263,6 @@ int main(int argc, char **argv)
if (cfd < 0)
die("socket(c)");
if (connect(cfd, (const struct sockaddr*)&saddr, salen) == -1)
die("connect()");
/* connection is pending in accept queue, accept() will either be
* explicit with "-l acc" below, or implicit on "-s <cmd>"
*/
arg0 = argv[0];
if (argc < 2) {
usage(arg0);
@ -284,10 +289,18 @@ int main(int argc, char **argv)
break;
case 'c' :
cmd++; cmdstep = 0;
if (!connected) {
do_con(cfd);
/* connection is pending in accept queue, accept() will either be
* explicit with "-l acc" below, or implicit on "-s <cmd>"
*/
}
fd = cfd;
break;
case 's' :
cmd++; cmdstep = 0;
if (!connected)
do_con(cfd);
if (sfd < 0)
do_acc(lfd);
if (sfd < 0)
@ -315,6 +328,9 @@ int main(int argc, char **argv)
if (strcmp(word, "acc") == 0) {
do_acc(fd);
}
else if (strcmp(word, "con") == 0) {
do_con(fd);
}
else if (strcmp(word, "snd") == 0) {
do_snd(fd);
}