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use major:minor as entries in watch directory

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This commit is contained in:
Kay Sievers 2010-03-10 18:54:35 +01:00
parent af24bb178e
commit 777239cb21
1 changed files with 29 additions and 18 deletions
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47
udev/udev-watch.c
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@ -1,5 +1,5 @@
/*
* Copyright (C) 2004-2008 Kay Sievers <kay.sievers@vrfy.org>
* Copyright (C) 2004-2010 Kay Sievers <kay.sievers@vrfy.org>
* Copyright (C) 2009 Canonical Ltd.
* Copyright (C) 2009 Scott James Remnant <scott@netsplit.com>
*
@ -72,29 +72,29 @@ void udev_watch_restore(struct udev *udev)
size_t l;
ssize_t len;
struct udev_device *dev;
int maj, min;
char type;
if (ent->d_name[0] < '0' || ent->d_name[0] > '9')
if (ent->d_name[0] == '.')
continue;
s = device;
l = util_strpcpy(&s, sizeof(device), udev_get_sys_path(udev));
len = readlinkat(dirfd(dir), ent->d_name, s, l);
if (len <= 0 || len >= (ssize_t)l) {
unlinkat(dirfd(dir), ent->d_name, 0);
continue;
}
if (len <= 0 || len >= (ssize_t)l)
goto unlink;
s[len] = '\0';
dbg(udev, "old watch to '%s' found\n", device);
dev = udev_device_new_from_syspath(udev, device);
if (dev == NULL) {
unlinkat(dirfd(dir), ent->d_name, 0);
continue;
}
if (sscanf(s, "%c%i:%i", &type, &maj, &min) != 3)
goto unlink;
dev = udev_device_new_from_devnum(udev, type, makedev(maj, min));
if (dev == NULL)
goto unlink;
info(udev, "restoring old watch on '%s'\n", udev_device_get_devnode(dev));
udev_watch_begin(udev, dev);
udev_device_unref(dev);
unlink:
unlinkat(dirfd(dir), ent->d_name, 0);
}
@ -109,6 +109,7 @@ void udev_watch_restore(struct udev *udev)
void udev_watch_begin(struct udev *udev, struct udev_device *dev)
{
char filename[UTIL_PATH_SIZE];
char majmin[UTIL_PATH_SIZE];
int wd;
if (inotify_fd < 0)
@ -122,10 +123,13 @@ void udev_watch_begin(struct udev *udev, struct udev_device *dev)
return;
}
snprintf(majmin, sizeof(majmin), "%c%i:%i",
strcmp(udev_device_get_subsystem(dev), "block") == 0 ? 'b' : 'c',
major(udev_device_get_devnum(dev)), minor(udev_device_get_devnum(dev)));
snprintf(filename, sizeof(filename), "%s/.udev/watch/%d", udev_get_dev_path(udev), wd);
util_create_path(udev, filename);
unlink(filename);
symlink(udev_device_get_devpath(dev), filename);
symlink(majmin, filename);
udev_device_set_watch_handle(dev, wd);
}
@ -154,20 +158,27 @@ void udev_watch_end(struct udev *udev, struct udev_device *dev)
struct udev_device *udev_watch_lookup(struct udev *udev, int wd)
{
char filename[UTIL_PATH_SIZE];
char syspath[UTIL_PATH_SIZE];
char majmin[UTIL_PATH_SIZE];
char *s;
size_t l;
ssize_t len;
int maj, min;
char type;
dev_t devnum;
if (inotify_fd < 0 || wd < 0)
return NULL;
snprintf(filename, sizeof(filename), "%s/.udev/watch/%d", udev_get_dev_path(udev), wd);
s = syspath;
l = util_strpcpy(&s, sizeof(syspath), udev_get_sys_path(udev));
s = majmin;
l = util_strpcpy(&s, sizeof(majmin), udev_get_sys_path(udev));
len = readlink(filename, s, l);
if (len < 0 || (size_t)len >= l)
return NULL;
s[len] = '\0';
return udev_device_new_from_syspath(udev, syspath);
if (sscanf(s, "%c%i:%i", &type, &maj, &min) != 3)
return NULL;
devnum = makedev(maj, min);
return udev_device_new_from_devnum(udev, type, devnum);
}