linux-kernel - [patch 2/2] timerfd - make the returned time to be the remaining time till the next expiration

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [day] [month] [year] [list]

Date:	Mon, 17 Dec 2007 12:20:41 -0800 (PST)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
cc:	Michael Kerrisk <mtk-manpages@....net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [patch 2/2] timerfd - make the returned time to be the remaining
 time till the next expiration

Make the returned time to be the remaining time till the next expiration.
If the timer is already expired, and there's no next expiration, zero will
be returned.
Andrew, this goes on top of the ones you already have in -mm.



Signed-off-by: Davide Libenzi <davidel@...ilserver.org>


- Davide


---
 fs/timerfd.c |   13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

Index: linux-2.6.mod/fs/timerfd.c
===================================================================
--- linux-2.6.mod.orig/fs/timerfd.c	2007-12-14 16:04:36.000000000 -0800
+++ linux-2.6.mod/fs/timerfd.c	2007-12-14 16:05:32.000000000 -0800
@@ -49,6 +49,15 @@
 	return HRTIMER_NORESTART;
 }
 
+static ktime_t timerfd_get_remaining(struct timerfd_ctx *ctx) {
+	ktime_t now, remaining;
+
+	now = ctx->tmr.base->get_time();
+	remaining = ktime_sub(ctx->tmr.expires, now);
+
+	return remaining.tv64 < 0 ? ktime_set(0, 0): remaining;
+}
+
 static void timerfd_setup(struct timerfd_ctx *ctx, int flags,
 			  const struct itimerspec *ktmr)
 {
@@ -240,7 +249,7 @@
 	if (ctx->expired && ctx->tintv.tv64)
 		hrtimer_forward_now(&ctx->tmr, ctx->tintv);
 
-	kotmr.it_value = ktime_to_timespec(ctx->tmr.expires);
+	kotmr.it_value = ktime_to_timespec(timerfd_get_remaining(ctx));
 	kotmr.it_interval = ktime_to_timespec(ctx->tintv);
 
 	/*
@@ -274,7 +283,7 @@
 			hrtimer_forward_now(&ctx->tmr, ctx->tintv) - 1;
 		hrtimer_restart(&ctx->tmr);
 	}
-	kotmr.it_value = ktime_to_timespec(ctx->tmr.expires);
+	kotmr.it_value = ktime_to_timespec(timerfd_get_remaining(ctx));
 	kotmr.it_interval = ktime_to_timespec(ctx->tintv);
 	spin_unlock_irq(&ctx->wqh.lock);
 	fput(file);
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/