static void
log_reader_idle_timeout(void *cookie)
{
LogReader *self = (LogReader *) cookie;
msg_notice("Source timeout has elapsed, closing connection",
evt_tag_int("fd", log_proto_server_get_fd(self->proto)));
log_pipe_notify(self->control, NC_CLOSE, self);
}
/* follow timer callback. Check if the file has new content, or deleted or
* moved. Ran every follow_freq seconds. */
static void
log_reader_io_follow_file(gpointer s)
{
LogReader *self = (LogReader *) s;
struct stat st, followed_st;
off_t pos = -1;
gint fd = log_proto_server_get_fd(self->proto);
msg_trace("Checking if the followed file has new lines",
evt_tag_str("follow_filename", self->follow_filename),
NULL);
if (fd >= 0)
{
pos = lseek(fd, 0, SEEK_CUR);
if (pos == (off_t) -1)
{
msg_error("Error invoking seek on followed file",
evt_tag_errno("error", errno),
NULL);
goto reschedule;
}
if (fstat(fd, &st) < 0)
{
if (errno == ESTALE)
{
msg_trace("log_reader_fd_check file moved ESTALE",
evt_tag_str("follow_filename", self->follow_filename),
NULL);
log_pipe_notify(self->control, &self->super.super, NC_FILE_MOVED, self);
return;
}
else
{
msg_error("Error invoking fstat() on followed file",
evt_tag_errno("error", errno),
NULL);
goto reschedule;
}
}
msg_trace("log_reader_fd_check",
evt_tag_int("pos", pos),
evt_tag_int("size", st.st_size),
NULL);
if (pos < st.st_size || !S_ISREG(st.st_mode))
{
/* we have data to read */
log_reader_io_process_input(s);
return;
}
else if (pos == st.st_size)
{
/* we are at EOF */
log_pipe_notify(self->control, &self->super.super, NC_FILE_EOF, self);
}
else if (pos > st.st_size)
{
/* the last known position is larger than the current size of the file. it got truncated. Restart from the beginning. */
log_pipe_notify(self->control, &self->super.super, NC_FILE_MOVED, self);
/* we may be freed by the time the notification above returns */
return;
}
}
if (self->follow_filename)
{
if (stat(self->follow_filename, &followed_st) != -1)
{
if (fd < 0 || (st.st_ino != followed_st.st_ino && followed_st.st_size > 0))
{
msg_trace("log_reader_fd_check file moved eof",
evt_tag_int("pos", pos),
evt_tag_int("size", followed_st.st_size),
evt_tag_str("follow_filename", self->follow_filename),
NULL);
/* file was moved and we are at EOF, follow the new file */
log_pipe_notify(self->control, &self->super.super, NC_FILE_MOVED, self);
/* we may be freed by the time the notification above returns */
return;
}
}
else
{
msg_verbose("Follow mode file still does not exist",
evt_tag_str("filename", self->follow_filename),
NULL);
}
}
reschedule:
log_reader_update_watches(self);
}
