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Make debugging output for epoll backend more comprehensive

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This commit is contained in:
Nick Mathewson 2010-09-21 22:23:32 -04:00
parent 38d09606ac
commit ec2b05eddd
1 changed files with 14 additions and 5 deletions
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19
epoll.c
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@ -248,26 +248,35 @@ epoll_apply_changes(struct event_base *base)
* should retry the operation as an ADD.
*/
if (epoll_ctl(epollop->epfd, EPOLL_CTL_ADD, ch->fd, &epev) == -1) {
event_warn("Epoll MOD retried as ADD; that failed too");
event_warn("Epoll MOD(%d) on %d retried as ADD; that failed too",
(int)epev.events, ch->fd);
} else {
event_debug((" Retried as ADD; succeeded."));
event_debug(("Epoll MOD(%d) on %d retried as ADD; succeeded.",
(int)epev.events,
ch->fd));
}
} else if (op == EPOLL_CTL_ADD && errno == EEXIST &&
precautionary_add) {
/* If a precautionary ADD operation fails with
EEXIST, that's fine too.
*/
event_debug((" ADD was redundant"));
event_debug(("Epoll ADD(%d) on fd %d gave %s: ADD was redundant",
(int)epev.events,
ch->fd, strerror(errno)));
} else if (op == EPOLL_CTL_DEL &&
(errno == ENOENT || errno == EBADF ||
errno == EPERM)) {
/* If a delete fails with one of these errors,
* that's fine too: we closed the fd before we
* got around to calling epoll_dispatch. */
event_debug((" DEL was unnecessary."));
event_debug(("Epoll DEL(%d) on fd %d gave %s: DEL was unnecessary.",
(int)epev.events,
ch->fd,
strerror(errno)));
} else {
event_warn("Epoll %s on fd %d failed. Old events were %d; read change was %d (%s); write change was %d (%s).",
event_warn("Epoll %s(%d) on fd %d failed. Old events were %d; read change was %d (%s); write change was %d (%s)",
epoll_op_to_string(op),
(int)epev.events,
ch->fd,
ch->old_events,
ch->read_change,