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udevd: create static device links only when the target exists

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For example, not all systems have PROC_KCORE enabled. Avoid a broken symbolic
link in those cases.

Signed-off-by: Yin Kangkai <kangkai.yin@intel.com>
Signed-off-by: Martin Pitt <martin.pitt@ubuntu.com>
This commit is contained in:
Yin Kangkai 2010-08-05 16:17:00 +08:00 committed by Martin Pitt
parent 40929a0222
commit 08f11597f2
1 changed files with 8 additions and 4 deletions
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12
udev/udevd.c
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@ -900,10 +900,14 @@ static void static_dev_create_links(struct udev *udev, DIR *dir)
unsigned int i;
for (i = 0; i < ARRAY_SIZE(stdlinks); i++) {
udev_selinux_setfscreateconat(udev, dirfd(dir), stdlinks[i].link, S_IFLNK);
if (symlinkat(stdlinks[i].target, dirfd(dir), stdlinks[i].link) < 0 && errno == EEXIST)
utimensat(dirfd(dir), stdlinks[i].link, NULL, AT_SYMLINK_NOFOLLOW);
udev_selinux_resetfscreatecon(udev);
struct stat sb;
if (stat(stdlinks[i].target, &sb) == 0) {
udev_selinux_setfscreateconat(udev, dirfd(dir), stdlinks[i].link, S_IFLNK);
if (symlinkat(stdlinks[i].target, dirfd(dir), stdlinks[i].link) < 0 && errno == EEXIST)
utimensat(dirfd(dir), stdlinks[i].link, NULL, AT_SYMLINK_NOFOLLOW);
udev_selinux_resetfscreatecon(udev);
}
}
}