@@ -2117,6 +2117,33 @@ out:
return ret;
}
+SYSCALL_DEFINE5(epoll_pwait1, int, epfd, int, flags,
+ struct epoll_event __user *, events,
+ int, maxevents,
+ struct epoll_wait_params __user *, params)
+{
+ struct epoll_wait_params p;
+ ktime_t kt = { 0 };
+ sigset_t sigmask;
+
+ if (flags)
+ return -EINVAL;
+ if (!params)
+ return -EINVAL;
+ if (copy_from_user(&p, params, sizeof(p)))
+ return -EFAULT;
+ if (p.sigmask) {
+ if (copy_from_user(&sigmask, p.sigmask, sizeof(sigmask)))
+ return -EFAULT;
+ if (p.sigsetsize != sizeof(p.sigmask))
+ return -EINVAL;
+ }
+ kt = timespec_to_ktime(p.timeout);
+
+ return epoll_pwait_do(epfd, events, maxevents, p.clockid,
+ kt, p.sigmask ? &sigmask : NULL);
+}
+
#ifdef CONFIG_COMPAT
COMPAT_SYSCALL_DEFINE6(epoll_pwait, int, epfd,
struct epoll_event __user *, events,
@@ -13,6 +13,7 @@
struct epoll_event;
struct epoll_ctl_cmd;
+struct epoll_wait_params;
struct iattr;
struct inode;
struct iocb;
@@ -635,6 +636,10 @@ asmlinkage long sys_epoll_pwait(int epfd, struct epoll_event __user *events,
int maxevents, int timeout,
const sigset_t __user *sigmask,
size_t sigsetsize);
+asmlinkage long sys_epoll_pwait1(int epfd, int flags,
+ struct epoll_event __user *events,
+ int maxevents,
+ struct epoll_wait_params __user *params);
asmlinkage long sys_epoll_ctl_batch(int epfd, int flags,
int ncmds,
struct epoll_ctl_cmd __user *cmds);
@@ -72,6 +72,13 @@ struct epoll_ctl_cmd {
int result;
} EPOLL_PACKED;
+struct epoll_wait_params {
+ int clockid;
+ struct timespec timeout;
+ sigset_t *sigmask;
+ size_t sigsetsize;
+} EPOLL_PACKED;
+
#ifdef CONFIG_PM_SLEEP
static inline void ep_take_care_of_epollwakeup(struct epoll_event *epev)
{
This is the new implementation for poll which has a flags parameter and packs a number of parameters into a structure. The main advantage of it over existing epoll_pwait is about timeout: epoll_pwait expects a relative millisecond value, while epoll_pwait1 accepts 1) a timespec which is in nanosecond granularity; 2) a clockid to allow using a clock other than CLOCK_MONOTONIC. The 'flags' field in params is reserved for now and must be zero. The next step would be allowing absolute timeout value. Signed-off-by: Fam Zheng <famz@redhat.com> --- fs/eventpoll.c | 27 +++++++++++++++++++++++++++ include/linux/syscalls.h | 5 +++++ include/uapi/linux/eventpoll.h | 7 +++++++ 3 files changed, 39 insertions(+)