From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail.codeweavers.com (mail.codeweavers.com [4.36.192.163]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 961D05394; Wed, 31 Jan 2024 02:16:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=4.36.192.163 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706667368; cv=none; b=SKS+kiLgsNDXrMECF40owruN6ivU3pJIOnYkR4Ii0Mv36xnEjtOLBA5Yw49nfW1SWVIP89lwAmmIC3IPCGMydUIqKPO2M7UcRH3e8fVUSoukRzIVR503HMZsiMs4FThBrLGJQo8Rl89Ek8jwhykn4sa0Ws1tRnN5YEoIjFufWG8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706667368; c=relaxed/simple; bh=HCJDXrbbClLe54itl4O3me4eGm27hgSAHGhToE6sjJA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=TMSkGJpPyqfaY/LD//lwg5hjR3/Fey7Y5sXE18a171cBns6MNjzJbAXONZ+7LEmtf8TXQn9QNpNsPInEa7TRbD4MX/sbixe1AViKA9fg6Q5YNvfA51/639O5hAl4bzlb9q59FDAiOuEe3o5OdIFV8Y4LUAB92VPWnXmfljOUN0E= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=codeweavers.com; spf=pass smtp.mailfrom=codeweavers.com; dkim=pass (2048-bit key) header.d=codeweavers.com header.i=@codeweavers.com header.b=b/wDzQH6; arc=none smtp.client-ip=4.36.192.163 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=codeweavers.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=codeweavers.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=codeweavers.com header.i=@codeweavers.com header.b="b/wDzQH6" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=codeweavers.com; s=s1; h=Message-ID:Date:Subject:Cc:To:From:Sender; bh=R39lGOqTNBMRXbRmwXOtAWXBwOD9NggROFCJWXViCO4=; b=b/wDzQH6Mzut/tAITEPLUTaKVE k9IamG8XOeeE3ntHS0bXtYmBvDn97GUEB/LVGXkFeCg0/6Rzb2j+YrUrg1+RUD2pskQOLaGMKA775 hjqKMmHp/Z15IzDSmXc9Hd16oW8zqJxgwF3fS7cVoeppiyvFvclwsfBUo2IykJkzjoxmVchrLxyaM Ds3s6WMIULYiGME82YQS/MHw/rqV236Z/EhhefrGN63zbwnhhtN+kllp/K1EZh8RXU+5Fo19E+W7+ jXAbN2VLiPjFRxpwvHjMccMdMbO/iVZrsND7y3hWzSDk+iP9Wiz2bXQRhyRheboNYWLmI2SRMdJfp yRew08zw==; Received: from cw137ip160.mn.codeweavers.com ([10.69.137.160] helo=camazotz.mn.codeweavers.com) by mail.codeweavers.com with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1rV08o-0038Kv-0p; Tue, 30 Jan 2024 20:15:54 -0600 From: Elizabeth Figura To: Arnd Bergmann , Greg Kroah-Hartman , Jonathan Corbet , Shuah Khan Cc: linux-kernel@vger.kernel.org, linux-api@vger.kernel.org, wine-devel@winehq.org, =?UTF-8?q?Andr=C3=A9=20Almeida?= , Wolfram Sang , Arkadiusz Hiler , Peter Zijlstra , Andy Lutomirski , linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, Elizabeth Figura Subject: [RFC PATCH v2 13/29] ntsync: Introduce NTSYNC_IOC_SEM_READ. Date: Tue, 30 Jan 2024 20:13:40 -0600 Message-ID: <20240131021356.10322-14-zfigura@codeweavers.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240131021356.10322-1-zfigura@codeweavers.com> References: <20240131021356.10322-1-zfigura@codeweavers.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit This corresponds to the NT syscall NtQuerySemaphore(). This returns the current count and maximum count of the semaphore. Signed-off-by: Elizabeth Figura --- drivers/misc/ntsync.c | 21 +++++++++++++++++++++ include/uapi/linux/ntsync.h | 1 + 2 files changed, 22 insertions(+) diff --git a/drivers/misc/ntsync.c b/drivers/misc/ntsync.c index 240ae858fa96..6dccfbfb2512 100644 --- a/drivers/misc/ntsync.c +++ b/drivers/misc/ntsync.c @@ -506,6 +506,25 @@ static int ntsync_event_reset(struct ntsync_obj *event, void __user *argp) return 0; } +static int ntsync_sem_read(struct ntsync_obj *sem, void __user *argp) +{ + struct ntsync_sem_args __user *user_args = argp; + struct ntsync_sem_args args; + + if (sem->type != NTSYNC_TYPE_SEM) + return -EINVAL; + + args.sem = 0; + spin_lock(&sem->lock); + args.count = sem->u.sem.count; + args.max = sem->u.sem.max; + spin_unlock(&sem->lock); + + if (copy_to_user(user_args, &args, sizeof(args))) + return -EFAULT; + return 0; +} + static int ntsync_obj_release(struct inode *inode, struct file *file) { struct ntsync_obj *obj = file->private_data; @@ -525,6 +544,8 @@ static long ntsync_obj_ioctl(struct file *file, unsigned int cmd, switch (cmd) { case NTSYNC_IOC_SEM_POST: return ntsync_sem_post(obj, argp); + case NTSYNC_IOC_SEM_READ: + return ntsync_sem_read(obj, argp); case NTSYNC_IOC_MUTEX_UNLOCK: return ntsync_mutex_unlock(obj, argp); case NTSYNC_IOC_MUTEX_KILL: diff --git a/include/uapi/linux/ntsync.h b/include/uapi/linux/ntsync.h index 598f894f868d..6017f621687e 100644 --- a/include/uapi/linux/ntsync.h +++ b/include/uapi/linux/ntsync.h @@ -51,5 +51,6 @@ struct ntsync_wait_args { #define NTSYNC_IOC_EVENT_SET _IOR ('N', 0x88, __u32) #define NTSYNC_IOC_EVENT_RESET _IOR ('N', 0x89, __u32) #define NTSYNC_IOC_EVENT_PULSE _IOR ('N', 0x8a, __u32) +#define NTSYNC_IOC_SEM_READ _IOR ('N', 0x8b, struct ntsync_sem_args) #endif -- 2.43.0