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scd: Fix DEVINFO, allowing no clients which watch the change.

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* scd/app.c [POSIX] (struct mrsw_lock): Add notify_watchers.
(card_list_signal): Only when watchers wait, kick by write(2).
(card_list_wait): Increment/decrement notify_watchers field.

--

GnuPG-bug-id: 7151
Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
This commit is contained in:
NIIBE Yutaka 2024-09-20 10:39:35 +09:00 committed by Werner Koch
parent f1e42cdf53
commit c98385d311
No known key found for this signature in database
GPG Key ID: E3FDFF218E45B72B
1 changed files with 7 additions and 3 deletions
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10
scd/app.c
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@ -58,6 +58,7 @@ struct mrsw_lock
HANDLE the_event;
#else
int notify_pipe[2];
int notify_watchers;
#endif
};
@ -380,7 +381,10 @@ card_list_signal (void)
log_error ("SetEvent for card_list_signal failed: %s\n",
w32_strerror (-1));
#else
write (card_list_lock.notify_pipe[1], "", 1);
npth_mutex_lock (&card_list_lock.lock);
if (card_list_lock.notify_watchers)
write (card_list_lock.notify_pipe[1], "", 1);
npth_mutex_unlock (&card_list_lock.lock);
#endif
}
@ -400,7 +404,7 @@ card_list_wait (ctrl_t ctrl)
npth_mutex_lock (&card_list_lock.lock);
card_list_lock.writer_active--;
npth_cond_broadcast (&card_list_lock.cond);
card_list_lock.notify_watchers++;
npth_mutex_unlock (&card_list_lock.lock);
while (1)
@ -448,7 +452,7 @@ card_list_wait (ctrl_t ctrl)
}
npth_mutex_lock (&card_list_lock.lock);
card_list_lock.notify_watchers--;
card_list_lock.num_writers_waiting++;
while (card_list_lock.num_readers_active
|| card_list_lock.writer_active)