Enhance nscd's inotify support (Bug 14906).

In bug 14906 the user complains that the inotify support in nscd
is not sufficient when it comes to detecting changes in the
configurationfiles that should be watched for the various databases.

The current nscd implementation uses inotify to watch for changes in
the configuration files, but adds watches only for IN_DELETE_SELF and
IN_MODIFY. These watches are insufficient to cover even the most basic
uses by a system administrator. For example using emacs or vim to edit
a configuration file should trigger a reload but it might not if
the editors use move to atomically update the file. This atomic update
changes the inode and thus removes the notification on the file (as
inotify is based on inodes). Thus the inotify support in nscd for
configuration files is insufficient to account for the average use
cases of system administrators and users.

The inotify support is significantly enhanced and described here:
https://www.sourceware.org/ml/libc-alpha/2015-02/msg00504.html

Tested on x86_64 with and without inotify support.

2 files changed, 30 insertions, 44 deletions

diff --git a/nss/nss_db/db-init.c b/nss/nss_db/db-init.c
index 041471cad0..099d89b1f8 100644
--- a/nss/nss_db/db-init.c
+++ b/nss/nss_db/db-init.c
@@ -22,35 +22,25 @@
 #include <nscd/nscd.h>
 #include <string.h>
 
-static union
-{
-  struct traced_file file;
-  char buf[sizeof (struct traced_file) + sizeof (_PATH_VARDB "passwd.db")];
-} pwd_traced_file;
-
-static union
-{
-  struct traced_file file;
-  char buf[sizeof (struct traced_file) + sizeof (_PATH_VARDB "group.db")];
-} grp_traced_file;
+#define PWD_FILENAME (_PATH_VARDB "passwd.db")
+define_traced_file (pwd, PWD_FILENAME);
 
-static union
-{
-  struct traced_file file;
-  char buf[sizeof (struct traced_file) + sizeof (_PATH_VARDB "services.db")];
-} serv_traced_file;
+#define GRP_FILENAME (_PATH_VARDB "group.db")
+define_traced_file (grp, GRP_FILENAME);
 
+#define SERV_FILENAME (_PATH_VARDB "services.db")
+define_traced_file (serv, SERV_FILENAME);
 
 void
 _nss_db_init (void (*cb) (size_t, struct traced_file *))
 {
-  strcpy (pwd_traced_file.file.fname,_PATH_VARDB  "passwd.db");
+  init_traced_file (&pwd_traced_file.file, PWD_FILENAME, 0);
   cb (pwddb, &pwd_traced_file.file);
 
-  strcpy (grp_traced_file.file.fname, _PATH_VARDB "group.db");
+  init_traced_file (&grp_traced_file.file, GRP_FILENAME, 0);
   cb (grpdb, &grp_traced_file.file);
 
-  strcpy (serv_traced_file.file.fname, _PATH_VARDB "services.db");
+  init_traced_file (&serv_traced_file.file, SERV_FILENAME, 0);
   cb (servdb, &serv_traced_file.file);
 }
 
diff --git a/nss/nss_files/files-init.c b/nss/nss_files/files-init.c
index 94d440aaa4..72eced41bf 100644
--- a/nss/nss_files/files-init.c
+++ b/nss/nss_files/files-init.c
@@ -21,47 +21,43 @@
 #include <string.h>
 #include <nscd/nscd.h>
 
+#define PWD_FILENAME "/etc/passwd"
+define_traced_file (pwd, PWD_FILENAME);
 
-#define TF(id, filename, ...)					\
-static union							\
-{								\
-  struct traced_file file;					\
-  char buf[sizeof (struct traced_file) + sizeof (filename)];	\
-} id##_traced_file =						\
-  {								\
-    .file =							\
-    {								\
-      __VA_ARGS__						\
-    }								\
-  }
-
-TF (pwd, "/etc/passwd");
-TF (grp, "/etc/group");
-TF (hst, "/etc/hosts");
-TF (resolv, "/etc/resolv.conf", .call_res_init = 1);
-TF (serv, "/etc/services");
-TF (netgr, "/etc/netgroup");
+#define GRP_FILENAME "/etc/group"
+define_traced_file (grp, GRP_FILENAME);
 
+#define HST_FILENAME "/etc/hosts"
+define_traced_file (hst, HST_FILENAME);
+
+#define RESOLV_FILENAME "/etc/resolv.conf"
+define_traced_file (resolv, RESOLV_FILENAME);
+
+#define SERV_FILENAME "/etc/services"
+define_traced_file (serv, SERV_FILENAME);
+
+#define NETGR_FILENAME "/etc/netgroup"
+define_traced_file (netgr, NETGR_FILENAME);
 
 void
 _nss_files_init (void (*cb) (size_t, struct traced_file *))
 {
-  strcpy (pwd_traced_file.file.fname, "/etc/passwd");
+  init_traced_file (&pwd_traced_file.file, PWD_FILENAME, 0);
   cb (pwddb, &pwd_traced_file.file);
 
-  strcpy (grp_traced_file.file.fname, "/etc/group");
+  init_traced_file (&grp_traced_file.file, GRP_FILENAME, 0);
   cb (grpdb, &grp_traced_file.file);
 
-  strcpy (hst_traced_file.file.fname, "/etc/hosts");
+  init_traced_file (&hst_traced_file.file, HST_FILENAME, 0);
   cb (hstdb, &hst_traced_file.file);
 
-  strcpy (resolv_traced_file.file.fname, "/etc/resolv.conf");
+  init_traced_file (&resolv_traced_file.file, RESOLV_FILENAME, 1);
   cb (hstdb, &resolv_traced_file.file);
 
-  strcpy (serv_traced_file.file.fname, "/etc/services");
+  init_traced_file (&serv_traced_file.file, SERV_FILENAME, 0);
   cb (servdb, &serv_traced_file.file);
 
-  strcpy (netgr_traced_file.file.fname, "/etc/netgroup");
+  init_traced_file (&netgr_traced_file.file, NETGR_FILENAME, 0);
   cb (netgrdb, &netgr_traced_file.file);
 }