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Teach the new inotify code about symlinks.

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This commit is contained in:
Simon Kelley
2014-12-15 15:58:13 +00:00
parent 9c448c8018
commit 857973e6f7
1 changed files with 27 additions and 16 deletions
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35
src/inotify.c
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@@ -41,6 +41,7 @@ void inotify_dnsmasq_init()
inotify_buffer = safe_malloc(INOTIFY_SZ);
daemon->inotifyfd = inotify_init1(IN_NONBLOCK | IN_CLOEXEC);
if (daemon->inotifyfd == -1)
@@ -48,22 +49,32 @@ void inotify_dnsmasq_init()
for (res = daemon->resolv_files; res; res = res->next)
{
char *d = strrchr(res->name, '/');
char *d = NULL, *path;
if (!d)
die(_("resolv-file %s not an absolute path"), res->name, EC_MISC);
if (!(path = realpath(res->name, NULL)))
{
/* realpath will fail if the file doesn't exist, but
dnsmasq copes with missing files, so fall back
and assume that symlinks are not in use in that case. */
if (errno == ENOENT)
path = res->name;
else
die(_("cannot cannonicalise resolv-file %s: %s"), res->name, EC_MISC);
}
*d = 0; /* make ->name just directory */
res->wd = inotify_add_watch(daemon->inotifyfd, res->name, IN_CLOSE_WRITE | IN_MOVED_TO);
res->file = d+1; /* pointer to filename */
if ((d = strrchr(path, '/')))
{
*d = 0; /* make path just directory */
res->wd = inotify_add_watch(daemon->inotifyfd, path, IN_CLOSE_WRITE | IN_MOVED_TO);
res->file = d+1; /* pointer to filename */
*d = '/';
if (res->wd == -1 && errno == ENOENT)
die(_("directory %s for resolv-file is missing, cannot poll"), res->name, EC_MISC);
if (res->wd == -1 && errno == ENOENT)
die(_("directory %s for resolv-file is missing, cannot poll"), res->name, EC_MISC);
*d = '/'; /* restore name */
if (res->wd == -1)
die(_("failed to create inotify for %s: %s"), res->name, EC_MISC);
if (res->wd == -1)
die(_("failed to create inotify for %s: %s"), res->name, EC_MISC);
}
}
}