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event: add ability to change fd of an active event source

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This commit is contained in:
Lennart Poettering 2013-12-13 05:13:59 +01:00
parent 8f726607ec
commit 30caf8f3af
2 changed files with 37 additions and 0 deletions
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36
src/libsystemd-bus/sd-event.c
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@ -1036,6 +1036,42 @@ _public_ int sd_event_source_get_io_fd(sd_event_source *s) {
return s->io.fd;
}
_public_ int sd_event_source_set_io_fd(sd_event_source *s, int fd) {
int r;
assert_return(s, -EINVAL);
assert_return(fd >= 0, -EINVAL);
assert_return(s->type == SOURCE_IO, -EDOM);
assert_return(!event_pid_changed(s->event), -ECHILD);
if (s->io.fd == fd)
return 0;
if (s->enabled == SD_EVENT_OFF) {
s->io.fd = fd;
s->io.registered = false;
} else {
int saved_fd;
saved_fd = s->io.fd;
assert(s->io.registered);
s->io.fd = fd;
s->io.registered = false;
r = source_io_register(s, s->enabled, s->io.events);
if (r < 0) {
s->io.fd = saved_fd;
s->io.registered = true;
return r;
}
epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, saved_fd, NULL);
}
return 0;
}
_public_ int sd_event_source_get_io_events(sd_event_source *s, uint32_t* events) {
assert_return(s, -EINVAL);
assert_return(events, -EINVAL);

1
src/systemd/sd-event.h
View file

@ -108,6 +108,7 @@ int sd_event_source_set_enabled(sd_event_source *s, int enabled);
void* sd_event_source_get_userdata(sd_event_source *s);
void* sd_event_source_set_userdata(sd_event_source *s, void *userdata);
int sd_event_source_get_io_fd(sd_event_source *s);
int sd_event_source_set_io_fd(sd_event_source *s, int fd);
int sd_event_source_get_io_events(sd_event_source *s, uint32_t* events);
int sd_event_source_set_io_events(sd_event_source *s, uint32_t events);
int sd_event_source_get_io_revents(sd_event_source *s, uint32_t* revents);