61 lines
2.0 KiB
Diff
61 lines
2.0 KiB
Diff
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From 99bca5d776a3011214041c42107a210fe315a35e Mon Sep 17 00:00:00 2001
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From: Elizabeth Figura <zfigura@codeweavers.com>
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Date: Sun, 19 May 2024 15:24:35 -0500
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Subject: ntsync: Introduce NTSYNC_IOC_EVENT_PULSE.
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This corresponds to the NT syscall NtPulseEvent().
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This wakes up any waiters as if the event had been set, but does not set the
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event, instead resetting it if it had been signalled. Thus, for a manual-reset
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event, all waiters are woken, whereas for an auto-reset event, at most one
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waiter is woken.
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Signed-off-by: Elizabeth Figura <zfigura@codeweavers.com>
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---
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drivers/misc/ntsync.c | 8 ++++++--
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include/uapi/linux/ntsync.h | 1 +
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2 files changed, 7 insertions(+), 2 deletions(-)
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--- a/drivers/misc/ntsync.c
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+++ b/drivers/misc/ntsync.c
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@@ -534,7 +534,7 @@ static int ntsync_mutex_kill(struct ntsy
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return ret;
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}
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-static int ntsync_event_set(struct ntsync_obj *event, void __user *argp)
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+static int ntsync_event_set(struct ntsync_obj *event, void __user *argp, bool pulse)
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{
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struct ntsync_device *dev = event->dev;
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__u32 prev_state;
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@@ -550,6 +550,8 @@ static int ntsync_event_set(struct ntsyn
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if (all)
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try_wake_all_obj(dev, event);
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try_wake_any_event(event);
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+ if (pulse)
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+ event->u.event.signaled = false;
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ntsync_unlock_obj(dev, event, all);
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@@ -605,9 +607,11 @@ static long ntsync_obj_ioctl(struct file
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case NTSYNC_IOC_MUTEX_KILL:
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return ntsync_mutex_kill(obj, argp);
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case NTSYNC_IOC_EVENT_SET:
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- return ntsync_event_set(obj, argp);
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+ return ntsync_event_set(obj, argp, false);
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case NTSYNC_IOC_EVENT_RESET:
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return ntsync_event_reset(obj, argp);
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+ case NTSYNC_IOC_EVENT_PULSE:
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+ return ntsync_event_set(obj, argp, true);
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default:
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return -ENOIOCTLCMD;
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}
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--- a/include/uapi/linux/ntsync.h
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+++ b/include/uapi/linux/ntsync.h
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@@ -53,5 +53,6 @@ struct ntsync_wait_args {
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#define NTSYNC_IOC_MUTEX_KILL _IOW ('N', 0x86, __u32)
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#define NTSYNC_IOC_EVENT_SET _IOR ('N', 0x88, __u32)
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#define NTSYNC_IOC_EVENT_RESET _IOR ('N', 0x89, __u32)
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+#define NTSYNC_IOC_EVENT_PULSE _IOR ('N', 0x8a, __u32)
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#endif
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