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changing lock mechanism

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Systems can suffer power interruptions whilst .lock files are in /etc,
preventing scripts and other automation tools from updating shadow's
files which persist across boots.

This commit replaces that mechanism with file locking to avoid problems
of power interruption/crashing.

Minor tweak to groupmems man page, requested by 'xx' on IRC.

Signed-off-by: ed neville <ed@s5h.net>
This commit is contained in:
ed neville
2022-12-06 19:21:55 +00:00
committed by Serge Hallyn
parent bc18c184e5
commit 65470e5c7d
3 changed files with 30 additions and 157 deletions
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lib/commonio.h
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@@ -123,6 +123,7 @@ extern int commonio_setname (struct commonio_db *, const char *);
extern bool commonio_present (const struct commonio_db *db);
extern int commonio_lock (struct commonio_db *);
extern int commonio_lock_nowait (struct commonio_db *, bool log);
extern int do_fcntl_lock (const char *file, bool log, short type);
extern int commonio_open (struct commonio_db *, int);
extern /*@observer@*/ /*@null@*/const void *commonio_locate (struct commonio_db *, const char *);
extern int commonio_update (struct commonio_db *, const void *);