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Differential D22515 Diff 64757 sys/compat/linux/linux_event.c

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sys/compat/linux/linux_event.c

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#if defined(__amd64__) #if defined(__amd64__)
__attribute__((packed)) __attribute__((packed))
#endif #endif
; ;
#define LINUX_MAX_EVENTS (INT_MAX / sizeof(struct epoll_event)) #define LINUX_MAX_EVENTS (INT_MAX / sizeof(struct epoll_event))
static void epoll_fd_install(struct thread *td, int fd, epoll_udata_t udata); static void epoll_fd_install(struct thread *td, int fd, epoll_udata_t udata);
static int epoll_to_kevent(struct thread *td, struct file *epfp, static int epoll_to_kevent(struct thread *td, int fd,
int fd, struct epoll_event *l_event, int *kev_flags, struct epoll_event *l_event, struct kevent *kevent,
struct kevent *kevent, int *nkevents); int *nkevents);
static void kevent_to_epoll(struct kevent *kevent, struct epoll_event *l_event); static void kevent_to_epoll(struct kevent *kevent, struct epoll_event *l_event);
static int epoll_kev_copyout(void *arg, struct kevent *kevp, int count); static int epoll_kev_copyout(void *arg, struct kevent *kevp, int count);
static int epoll_kev_copyin(void *arg, struct kevent *kevp, int count); static int epoll_kev_copyin(void *arg, struct kevent *kevp, int count);
static int epoll_delete_event(struct thread *td, struct file *epfp, static int epoll_register_kevent(struct thread *td, struct file *epfp,
int fd, int filter); int fd, int filter, unsigned int flags);
static int epoll_fd_registered(struct thread *td, struct file *epfp,
int fd);
static int epoll_delete_all_events(struct thread *td, struct file *epfp, static int epoll_delete_all_events(struct thread *td, struct file *epfp,
int fd); int fd);
struct epoll_copyin_args { struct epoll_copyin_args {
struct kevent *changelist; struct kevent *changelist;
}; };
struct epoll_copyout_args { struct epoll_copyout_args {
▲ Show 20 Lines • Show All 174 Lines • ▼ Show 20 Lineslinux_epoll_create1(struct thread *td, struct linux_epoll_create1_args *args)
if ((args->flags & LINUX_O_CLOEXEC) != 0) if ((args->flags & LINUX_O_CLOEXEC) != 0)
flags |= O_CLOEXEC; flags |= O_CLOEXEC;
return (epoll_create_common(td, flags)); return (epoll_create_common(td, flags));
} }
/* Structure converting function from epoll to kevent. */ /* Structure converting function from epoll to kevent. */
static int static int
epoll_to_kevent(struct thread *td, struct file *epfp, epoll_to_kevent(struct thread *td, int fd, struct epoll_event *l_event,
int fd, struct epoll_event *l_event, int *kev_flags,
struct kevent *kevent, int *nkevents) struct kevent *kevent, int *nkevents)
{ {
uint32_t levents = l_event->events; uint32_t levents = l_event->events;
struct linux_pemuldata *pem; struct linux_pemuldata *pem;
struct proc *p; struct proc *p;
unsigned short kev_flags = EV_ADD | EV_ENABLE;
/* flags related to how event is registered */ /* flags related to how event is registered */
if ((levents & LINUX_EPOLLONESHOT) != 0) if ((levents & LINUX_EPOLLONESHOT) != 0)
*kev_flags |= EV_DISPATCH; kev_flags |= EV_DISPATCH;
if ((levents & LINUX_EPOLLET) != 0) if ((levents & LINUX_EPOLLET) != 0)
*kev_flags |= EV_CLEAR; kev_flags |= EV_CLEAR;
if ((levents & LINUX_EPOLLERR) != 0) if ((levents & LINUX_EPOLLERR) != 0)
*kev_flags |= EV_ERROR; kev_flags |= EV_ERROR;
if ((levents & LINUX_EPOLLRDHUP) != 0) if ((levents & LINUX_EPOLLRDHUP) != 0)
*kev_flags |= EV_EOF; kev_flags |= EV_EOF;
/* flags related to what event is registered */ /* flags related to what event is registered */
if ((levents & LINUX_EPOLL_EVRD) != 0) { if ((levents & LINUX_EPOLL_EVRD) != 0) {
EV_SET(kevent++, fd, EVFILT_READ, *kev_flags, 0, 0, 0); EV_SET(kevent++, fd, EVFILT_READ, kev_flags, 0, 0, 0);
++(*nkevents); ++(*nkevents);
} }
if ((levents & LINUX_EPOLL_EVWR) != 0) { if ((levents & LINUX_EPOLL_EVWR) != 0) {
EV_SET(kevent++, fd, EVFILT_WRITE, *kev_flags, 0, 0, 0); EV_SET(kevent++, fd, EVFILT_WRITE, kev_flags, 0, 0, 0);
++(*nkevents); ++(*nkevents);
} }
if ((levents & ~(LINUX_EPOLL_EVSUP)) != 0) { if ((levents & ~(LINUX_EPOLL_EVSUP)) != 0) {
p = td->td_proc; p = td->td_proc;
pem = pem_find(p); pem = pem_find(p);
KASSERT(pem != NULL, ("epoll proc emuldata not found.\n")); KASSERT(pem != NULL, ("epoll proc emuldata not found.\n"));
▲ Show 20 Lines • Show All 114 Lines • ▼ Show 20 Lineslinux_epoll_ctl(struct thread *td, struct linux_epoll_ctl_args *args)
struct file *epfp, *fp; struct file *epfp, *fp;
struct epoll_copyin_args ciargs; struct epoll_copyin_args ciargs;
struct kevent kev[2]; struct kevent kev[2];
struct kevent_copyops k_ops = { &ciargs, struct kevent_copyops k_ops = { &ciargs,
NULL, NULL,
epoll_kev_copyin}; epoll_kev_copyin};
struct epoll_event le; struct epoll_event le;
cap_rights_t rights; cap_rights_t rights;
int kev_flags;
int nchanges = 0; int nchanges = 0;
int error; int error;
if (args->op != LINUX_EPOLL_CTL_DEL) { if (args->op != LINUX_EPOLL_CTL_DEL) {
error = copyin(args->event, &le, sizeof(le)); error = copyin(args->event, &le, sizeof(le));
if (error != 0) if (error != 0)
return (error); return (error);
} }
Show All 16 Lineslinux_epoll_ctl(struct thread *td, struct linux_epoll_ctl_args *args)
if (epfp == fp) { if (epfp == fp) {
error = EINVAL; error = EINVAL;
goto leave0; goto leave0;
} }
ciargs.changelist = kev; ciargs.changelist = kev;
if (args->op != LINUX_EPOLL_CTL_DEL) { if (args->op != LINUX_EPOLL_CTL_DEL) {
kev_flags = EV_ADD | EV_ENABLE; error = epoll_to_kevent(td, args->fd, &le, kev, &nchanges);
error = epoll_to_kevent(td, epfp, args->fd, &le,
&kev_flags, kev, &nchanges);
if (error != 0) if (error != 0)
goto leave0; goto leave0;
} }
switch (args->op) { switch (args->op) {
case LINUX_EPOLL_CTL_MOD: case LINUX_EPOLL_CTL_MOD:
error = epoll_delete_all_events(td, epfp, args->fd); error = epoll_delete_all_events(td, epfp, args->fd);
if (error != 0) if (error != 0)
goto leave0; goto leave0;
break; break;
case LINUX_EPOLL_CTL_ADD: case LINUX_EPOLL_CTL_ADD:
/* if (epoll_fd_registered(td, epfp, args->fd)) {
* kqueue_register() return ENOENT if event does not exists
* and the EV_ADD flag is not set. Reset EV_ENABLE flag to
* avoid accidental activation of fired oneshot events.
*/
kev[0].flags &= ~(EV_ADD | EV_ENABLE);
error = kqfd_register(args->epfd, &kev[0], td, M_WAITOK);
if (error != ENOENT) {
error = EEXIST; error = EEXIST;
goto leave0; goto leave0;
} }
error = 0;
kev[0].flags |= (EV_ADD | EV_ENABLE);
break; break;
case LINUX_EPOLL_CTL_DEL: case LINUX_EPOLL_CTL_DEL:
/* CTL_DEL means unregister this fd with this epoll */ /* CTL_DEL means unregister this fd with this epoll */
error = epoll_delete_all_events(td, epfp, args->fd); error = epoll_delete_all_events(td, epfp, args->fd);
goto leave0; goto leave0;
default: default:
▲ Show 20 Lines • Show All 123 Lines • ▼ Show 20 Lines if (args->mask != NULL) {
pmask = &mask; pmask = &mask;
} else } else
pmask = NULL; pmask = NULL;
return (linux_epoll_wait_common(td, args->epfd, args->events, return (linux_epoll_wait_common(td, args->epfd, args->events,
args->maxevents, args->timeout, pmask)); args->maxevents, args->timeout, pmask));
} }
static int static int
epoll_delete_event(struct thread *td, struct file *epfp, int fd, int filter) epoll_register_kevent(struct thread *td, struct file *epfp, int fd, int filter,
unsigned int flags)
{ {
struct epoll_copyin_args ciargs; struct epoll_copyin_args ciargs;
struct kevent kev; struct kevent kev;
struct kevent_copyops k_ops = { &ciargs, struct kevent_copyops k_ops = { &ciargs,
NULL, NULL,
epoll_kev_copyin}; epoll_kev_copyin};
ciargs.changelist = &kev; ciargs.changelist = &kev;
EV_SET(&kev, fd, filter, EV_DELETE | EV_DISABLE, 0, 0, 0); EV_SET(&kev, fd, filter, flags, 0, 0, 0);
return (kern_kevent_fp(td, epfp, 1, 0, &k_ops, NULL)); return (kern_kevent_fp(td, epfp, 1, 0, &k_ops, NULL));
} }
static int static int
epoll_fd_registered(struct thread *td, struct file *epfp, int fd)
{
/*
* Set empty filter flags to avoid accidental modification of already
* registered events. In the case of event re-registration:
* 1. If event does not exists kevent() does nothing and returns ENOENT
* 2. If event does exists, it's enabled/disabled state is preserved
* but fflags, data and udata fields are overwritten. So we can not
* set socket lowats and store user's context pointer in udata.
*/
if (epoll_register_kevent(td, epfp, fd, EVFILT_READ, 0) != ENOENT ||
epoll_register_kevent(td, epfp, fd, EVFILT_WRITE, 0) != ENOENT)
return (1);
return (0);
}
static int
epoll_delete_all_events(struct thread *td, struct file *epfp, int fd) epoll_delete_all_events(struct thread *td, struct file *epfp, int fd)
{ {
int error1, error2; int error1, error2;
error1 = epoll_delete_event(td, epfp, fd, EVFILT_READ); error1 = epoll_register_kevent(td, epfp, fd, EVFILT_READ, EV_DELETE);
error2 = epoll_delete_event(td, epfp, fd, EVFILT_WRITE); error2 = epoll_register_kevent(td, epfp, fd, EVFILT_WRITE, EV_DELETE);
/* return 0 if at least one result positive */ /* return 0 if at least one result positive */
return (error1 == 0 ? 0 : error2); return (error1 == 0 ? 0 : error2);
} }
static int static int
eventfd_create(struct thread *td, uint32_t initval, int flags) eventfd_create(struct thread *td, uint32_t initval, int flags)
{ {
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