Hello!
By adding EV_ET to the flags, I can watch a directory for changes --
such as files being added or removed to it -- using libevent (at least,
on FreeBSD). Sample program attached.
Does libev provide a similar functionality? Some mailing list archives
suggest, edge-triggered events aren't supported by libev (for
portability?), but those pages are from 2010. Have there been
improvements since, perhaps?
Libevent did not have EV_ET until fairly recently too, but it is there
now... Please, advise. Thank you!
-mi
#include <sys/types.h>
#include <dirent.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <event2/event.h>
static void
handler(evutil_socket_t fd, short type, void *_p)
{
const char *p = _p;
printf("%s (%d) triggered by event(s) %hd\n", p, (int)fd, type);
}
static void
errhandler(int err)
{
fprintf(stderr, "Error %d (%s) occured\n", err, strerror(err));
}
int
main(int argc, char *argv[])
{
int dd, i;
DIR *dp;
struct event_base *eb;
struct event *e;
dp = opendir(argv[argc - 1]);
if (dp == NULL) {
fprintf(stderr, "%s: %s: %s\n", argv[0], argv[argc - 1],
strerror(errno));
exit(EX_NOINPUT);
}
dd = dirfd(dp);
event_set_fatal_callback(errhandler);
eb = event_base_new();
e = event_new(eb, dd, EV_WRITE|EV_READ|EV_ET|EV_PERSIST, handler,
argv[argc - 1]);
event_add(e, NULL);
switch (i = event_base_dispatch(eb)) {
case -1:
fprintf(stderr, "event_base_dispatch failed\n");
exit(EX_SOFTWARE);
case 1:
fprintf(stderr, "event_base_dispatch found no "
"events to care\n");
exit(EX_SOFTWARE);
case 0:
break;
default:
fprintf(stderr, "event_base_dispatch returned "
"unexpected valued %d\n", i);
exit(EX_SOFTWARE);
}
return 0;
}
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