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Depromiscuify inotify with IN_MASK_ADD

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Use IN_MASK_ADD instead of using a no-longer-promiscuous-enough
mask.  This simplifies the code and restores the ability to
use IN_ACCESS, IN_CLOSE_WRITE, IN_CLOSE_NOWRITE, and IN_OPEN
in some cases (Bug#26973).
* src/inotify.c (INOTIFY_DEFAULT_MASK): Remove.
(Finotify_add_watch): Use IN_MASK_ADD instead.
This commit is contained in:
Paul Eggert 2017-05-27 10:54:25 -07:00
parent ad656a726f
commit d387305062
1 changed files with 1 additions and 17 deletions
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18
src/inotify.c
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@ -42,21 +42,6 @@ along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
# define IN_ONLYDIR 0
#endif
/* Events that inotify-add-watch waits for. This list has all the
events that any watcher could include, because we want to support
multiple watches on the same file even though inotify uses the same
descriptor for all watches to that file. This list omits
IN_ACCESS, IN_CLOSE_WRITE, IN_CLOSE_NOWRITE, and IN_OPEN because
they would prevent other processes from reading; see Bug#26973.
FIXME: Explain why it is OK to omit these four bits here even
though a inotify-add-watch call might specify them. */
#define INOTIFY_DEFAULT_MASK \
(IN_ATTRIB | IN_CREATE | IN_DELETE | IN_DELETE_SELF \
| IN_IGNORED | IN_MODIFY | IN_MOVE_SELF | IN_MOVED_FROM \
| IN_MOVED_TO | IN_EXCL_UNLINK)
/* File handle for inotify. */
static int inotifyfd = -1;
@ -436,8 +421,7 @@ IN_ONESHOT */)
Lisp_Object encoded_file_name;
int wd = -1;
uint32_t imask = aspect_to_inotifymask (aspect);
uint32_t mask = (INOTIFY_DEFAULT_MASK
| (imask & (IN_DONT_FOLLOW | IN_ONLYDIR)));
uint32_t mask = imask | IN_MASK_ADD | IN_EXCL_UNLINK;
CHECK_STRING (filename);