2 * Copyright (c) 1982, 1986, 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
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7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
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23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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34 * @(#)sys_generic.c 8.5 (Berkeley) 1/21/94
35 * $FreeBSD: src/sys/kern/sys_generic.c,v 1.55.2.10 2001/03/17 10:39:32 peter Exp $
38 #include "opt_ktrace.h"
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/sysproto.h>
43 #include <sys/event.h>
44 #include <sys/filedesc.h>
45 #include <sys/filio.h>
46 #include <sys/fcntl.h>
49 #include <sys/signalvar.h>
50 #include <sys/socketvar.h>
52 #include <sys/kernel.h>
53 #include <sys/kern_syscall.h>
54 #include <sys/malloc.h>
55 #include <sys/mapped_ioctl.h>
57 #include <sys/queue.h>
58 #include <sys/resourcevar.h>
59 #include <sys/socketops.h>
60 #include <sys/sysctl.h>
61 #include <sys/sysent.h>
64 #include <sys/ktrace.h>
67 #include <vm/vm_page.h>
69 #include <sys/file2.h>
70 #include <sys/mplock2.h>
71 #include <sys/spinlock2.h>
73 #include <machine/limits.h>
75 static MALLOC_DEFINE(M_IOCTLOPS, "ioctlops", "ioctl data buffer");
76 static MALLOC_DEFINE(M_IOCTLMAP, "ioctlmap", "mapped ioctl handler buffer");
77 static MALLOC_DEFINE(M_SELECT, "select", "select() buffer");
78 MALLOC_DEFINE(M_IOV, "iov", "large iov's");
80 typedef struct kfd_set {
84 enum select_copyin_states {
85 COPYIN_READ, COPYIN_WRITE, COPYIN_EXCEPT, COPYIN_DONE };
87 struct select_kevent_copyin_args {
91 int active_set; /* One of select_copyin_states */
92 struct lwp *lwp; /* Pointer to our lwp */
93 int num_fds; /* Number of file descriptors (syscall arg) */
94 int proc_fds; /* Processed fd's (wraps) */
95 int error; /* Returned to userland */
98 struct poll_kevent_copyin_args {
106 static struct lwkt_token mioctl_token = LWKT_TOKEN_INITIALIZER(mioctl_token);
108 static int doselect(int nd, fd_set *in, fd_set *ou, fd_set *ex,
109 struct timespec *ts, int *res);
110 static int dopoll(int nfds, struct pollfd *fds, struct timespec *ts,
111 int *res, int flags);
112 static int dofileread(int, struct file *, struct uio *, int, size_t *);
113 static int dofilewrite(int, struct file *, struct uio *, int, size_t *);
121 sys_read(struct read_args *uap)
123 struct thread *td = curthread;
128 if ((ssize_t)uap->nbyte < 0)
131 aiov.iov_base = uap->buf;
132 aiov.iov_len = uap->nbyte;
133 auio.uio_iov = &aiov;
135 auio.uio_offset = -1;
136 auio.uio_resid = uap->nbyte;
137 auio.uio_rw = UIO_READ;
138 auio.uio_segflg = UIO_USERSPACE;
141 error = kern_preadv(uap->fd, &auio, 0, &uap->sysmsg_szresult);
146 * Positioned (Pread) read system call
151 sys_extpread(struct extpread_args *uap)
153 struct thread *td = curthread;
159 if ((ssize_t)uap->nbyte < 0)
162 aiov.iov_base = uap->buf;
163 aiov.iov_len = uap->nbyte;
164 auio.uio_iov = &aiov;
166 auio.uio_offset = uap->offset;
167 auio.uio_resid = uap->nbyte;
168 auio.uio_rw = UIO_READ;
169 auio.uio_segflg = UIO_USERSPACE;
172 flags = uap->flags & O_FMASK;
173 if (uap->offset != (off_t)-1)
176 error = kern_preadv(uap->fd, &auio, flags, &uap->sysmsg_szresult);
181 * Scatter read system call.
186 sys_readv(struct readv_args *uap)
188 struct thread *td = curthread;
190 struct iovec aiov[UIO_SMALLIOV], *iov = NULL;
193 error = iovec_copyin(uap->iovp, &iov, aiov, uap->iovcnt,
198 auio.uio_iovcnt = uap->iovcnt;
199 auio.uio_offset = -1;
200 auio.uio_rw = UIO_READ;
201 auio.uio_segflg = UIO_USERSPACE;
204 error = kern_preadv(uap->fd, &auio, 0, &uap->sysmsg_szresult);
206 iovec_free(&iov, aiov);
212 * Scatter positioned read system call.
217 sys_extpreadv(struct extpreadv_args *uap)
219 struct thread *td = curthread;
221 struct iovec aiov[UIO_SMALLIOV], *iov = NULL;
225 error = iovec_copyin(uap->iovp, &iov, aiov, uap->iovcnt,
230 auio.uio_iovcnt = uap->iovcnt;
231 auio.uio_offset = uap->offset;
232 auio.uio_rw = UIO_READ;
233 auio.uio_segflg = UIO_USERSPACE;
236 flags = uap->flags & O_FMASK;
237 if (uap->offset != (off_t)-1)
240 error = kern_preadv(uap->fd, &auio, flags, &uap->sysmsg_szresult);
242 iovec_free(&iov, aiov);
250 kern_preadv(int fd, struct uio *auio, int flags, size_t *res)
252 struct thread *td = curthread;
253 struct proc *p = td->td_proc;
259 fp = holdfp(p->p_fd, fd, FREAD);
262 if (flags & O_FOFFSET && fp->f_type != DTYPE_VNODE) {
265 error = dofileread(fd, fp, auio, flags, res);
272 * Common code for readv and preadv that reads data in
273 * from a file using the passed in uio, offset, and flags.
275 * MPALMOSTSAFE - ktrace needs help
278 dofileread(int fd, struct file *fp, struct uio *auio, int flags, size_t *res)
283 struct thread *td = curthread;
284 struct iovec *ktriov = NULL;
290 * if tracing, save a copy of iovec
292 if (KTRPOINT(td, KTR_GENIO)) {
293 int iovlen = auio->uio_iovcnt * sizeof(struct iovec);
295 ktriov = kmalloc(iovlen, M_TEMP, M_WAITOK);
296 bcopy((caddr_t)auio->uio_iov, (caddr_t)ktriov, iovlen);
300 len = auio->uio_resid;
301 error = fo_read(fp, auio, fp->f_cred, flags);
303 if (auio->uio_resid != len && (error == ERESTART ||
304 error == EINTR || error == EWOULDBLOCK))
308 if (ktriov != NULL) {
310 ktruio.uio_iov = ktriov;
311 ktruio.uio_resid = len - auio->uio_resid;
312 ktrgenio(td->td_lwp, fd, UIO_READ, &ktruio, error);
314 kfree(ktriov, M_TEMP);
318 *res = len - auio->uio_resid;
329 sys_write(struct write_args *uap)
331 struct thread *td = curthread;
336 if ((ssize_t)uap->nbyte < 0)
339 aiov.iov_base = (void *)(uintptr_t)uap->buf;
340 aiov.iov_len = uap->nbyte;
341 auio.uio_iov = &aiov;
343 auio.uio_offset = -1;
344 auio.uio_resid = uap->nbyte;
345 auio.uio_rw = UIO_WRITE;
346 auio.uio_segflg = UIO_USERSPACE;
349 error = kern_pwritev(uap->fd, &auio, 0, &uap->sysmsg_szresult);
360 sys_extpwrite(struct extpwrite_args *uap)
362 struct thread *td = curthread;
368 if ((ssize_t)uap->nbyte < 0)
371 aiov.iov_base = (void *)(uintptr_t)uap->buf;
372 aiov.iov_len = uap->nbyte;
373 auio.uio_iov = &aiov;
375 auio.uio_offset = uap->offset;
376 auio.uio_resid = uap->nbyte;
377 auio.uio_rw = UIO_WRITE;
378 auio.uio_segflg = UIO_USERSPACE;
381 flags = uap->flags & O_FMASK;
382 if (uap->offset != (off_t)-1)
384 error = kern_pwritev(uap->fd, &auio, flags, &uap->sysmsg_szresult);
392 sys_writev(struct writev_args *uap)
394 struct thread *td = curthread;
396 struct iovec aiov[UIO_SMALLIOV], *iov = NULL;
399 error = iovec_copyin(uap->iovp, &iov, aiov, uap->iovcnt,
404 auio.uio_iovcnt = uap->iovcnt;
405 auio.uio_offset = -1;
406 auio.uio_rw = UIO_WRITE;
407 auio.uio_segflg = UIO_USERSPACE;
410 error = kern_pwritev(uap->fd, &auio, 0, &uap->sysmsg_szresult);
412 iovec_free(&iov, aiov);
418 * Gather positioned write system call
423 sys_extpwritev(struct extpwritev_args *uap)
425 struct thread *td = curthread;
427 struct iovec aiov[UIO_SMALLIOV], *iov = NULL;
431 error = iovec_copyin(uap->iovp, &iov, aiov, uap->iovcnt,
436 auio.uio_iovcnt = uap->iovcnt;
437 auio.uio_offset = uap->offset;
438 auio.uio_rw = UIO_WRITE;
439 auio.uio_segflg = UIO_USERSPACE;
442 flags = uap->flags & O_FMASK;
443 if (uap->offset != (off_t)-1)
446 error = kern_pwritev(uap->fd, &auio, flags, &uap->sysmsg_szresult);
448 iovec_free(&iov, aiov);
456 kern_pwritev(int fd, struct uio *auio, int flags, size_t *res)
458 struct thread *td = curthread;
459 struct proc *p = td->td_proc;
465 fp = holdfp(p->p_fd, fd, FWRITE);
468 else if ((flags & O_FOFFSET) && fp->f_type != DTYPE_VNODE) {
471 error = dofilewrite(fd, fp, auio, flags, res);
479 * Common code for writev and pwritev that writes data to
480 * a file using the passed in uio, offset, and flags.
482 * MPALMOSTSAFE - ktrace needs help
485 dofilewrite(int fd, struct file *fp, struct uio *auio, int flags, size_t *res)
487 struct thread *td = curthread;
488 struct lwp *lp = td->td_lwp;
492 struct iovec *ktriov = NULL;
498 * if tracing, save a copy of iovec and uio
500 if (KTRPOINT(td, KTR_GENIO)) {
501 int iovlen = auio->uio_iovcnt * sizeof(struct iovec);
503 ktriov = kmalloc(iovlen, M_TEMP, M_WAITOK);
504 bcopy((caddr_t)auio->uio_iov, (caddr_t)ktriov, iovlen);
508 len = auio->uio_resid;
509 error = fo_write(fp, auio, fp->f_cred, flags);
511 if (auio->uio_resid != len && (error == ERESTART ||
512 error == EINTR || error == EWOULDBLOCK))
514 /* Socket layer is responsible for issuing SIGPIPE. */
515 if (error == EPIPE && fp->f_type != DTYPE_SOCKET)
516 lwpsignal(lp->lwp_proc, lp, SIGPIPE);
519 if (ktriov != NULL) {
521 ktruio.uio_iov = ktriov;
522 ktruio.uio_resid = len - auio->uio_resid;
523 ktrgenio(lp, fd, UIO_WRITE, &ktruio, error);
525 kfree(ktriov, M_TEMP);
529 *res = len - auio->uio_resid;
540 sys_ioctl(struct ioctl_args *uap)
544 error = mapped_ioctl(uap->fd, uap->com, uap->data, NULL, &uap->sysmsg);
548 struct ioctl_map_entry {
550 struct ioctl_map_range *cmd_ranges;
551 LIST_ENTRY(ioctl_map_entry) entries;
555 * The true heart of all ioctl syscall handlers (native, emulation).
556 * If map != NULL, it will be searched for a matching entry for com,
557 * and appropriate conversions/conversion functions will be utilized.
562 mapped_ioctl(int fd, u_long com, caddr_t uspc_data, struct ioctl_map *map,
565 struct thread *td = curthread;
566 struct proc *p = td->td_proc;
569 struct ioctl_map_range *iomc = NULL;
575 #define STK_PARAMS 128
577 char stkbuf[STK_PARAMS];
585 fp = holdfp(p->p_fd, fd, FREAD|FWRITE);
589 if (map != NULL) { /* obey translation map */
591 struct ioctl_map_entry *e;
593 maskcmd = com & map->mask;
595 lwkt_gettoken(&mioctl_token);
596 LIST_FOREACH(e, &map->mapping, entries) {
597 for (iomc = e->cmd_ranges; iomc->start != 0 ||
598 iomc->maptocmd != 0 || iomc->wrapfunc != NULL ||
599 iomc->mapfunc != NULL;
601 if (maskcmd >= iomc->start &&
602 maskcmd <= iomc->end)
606 /* Did we find a match? */
607 if (iomc->start != 0 || iomc->maptocmd != 0 ||
608 iomc->wrapfunc != NULL || iomc->mapfunc != NULL)
611 lwkt_reltoken(&mioctl_token);
614 (iomc->start == 0 && iomc->maptocmd == 0
615 && iomc->wrapfunc == NULL && iomc->mapfunc == NULL)) {
616 kprintf("%s: 'ioctl' fd=%d, cmd=0x%lx ('%c',%d) not implemented\n",
617 map->sys, fd, maskcmd,
618 (int)((maskcmd >> 8) & 0xff),
619 (int)(maskcmd & 0xff));
625 * If it's a non-range one to one mapping, maptocmd should be
626 * correct. If it's a ranged one to one mapping, we pass the
627 * original value of com, and for a range mapped to a different
628 * range, we always need a mapping function to translate the
629 * ioctl to our native ioctl. Ex. 6500-65ff <-> 9500-95ff
631 if (iomc->start == iomc->end && iomc->maptocmd == iomc->maptoend) {
632 com = iomc->maptocmd;
633 } else if (iomc->start == iomc->maptocmd && iomc->end == iomc->maptoend) {
634 if (iomc->mapfunc != NULL)
635 com = iomc->mapfunc(iomc->start, iomc->end,
636 iomc->start, iomc->end,
639 if (iomc->mapfunc != NULL) {
640 com = iomc->mapfunc(iomc->start, iomc->end,
641 iomc->maptocmd, iomc->maptoend,
644 kprintf("%s: Invalid mapping for fd=%d, cmd=%#lx ('%c',%d)\n",
645 map->sys, fd, maskcmd,
646 (int)((maskcmd >> 8) & 0xff),
647 (int)(maskcmd & 0xff));
656 error = fclrfdflags(p->p_fd, fd, UF_EXCLOSE);
659 error = fsetfdflags(p->p_fd, fd, UF_EXCLOSE);
664 * Interpret high order word to find amount of data to be
665 * copied to/from the user's address space.
667 size = IOCPARM_LEN(com);
668 if (size > IOCPARM_MAX) {
673 if ((com & IOC_VOID) == 0 && size > sizeof(ubuf.stkbuf)) {
674 memp = kmalloc(size, M_IOCTLOPS, M_WAITOK);
680 if (com & IOC_VOID) {
681 *(caddr_t *)data = uspc_data;
682 } else if (com & IOC_IN) {
684 error = copyin(uspc_data, data, (size_t)size);
688 *(caddr_t *)data = uspc_data;
690 } else if ((com & IOC_OUT) != 0 && size) {
692 * Zero the buffer so the user always
693 * gets back something deterministic.
695 bzero(data, (size_t)size);
700 if ((tmp = *(int *)data))
701 atomic_set_int(&fp->f_flag, FNONBLOCK);
703 atomic_clear_int(&fp->f_flag, FNONBLOCK);
708 if ((tmp = *(int *)data))
709 atomic_set_int(&fp->f_flag, FASYNC);
711 atomic_clear_int(&fp->f_flag, FASYNC);
712 error = fo_ioctl(fp, FIOASYNC, (caddr_t)&tmp, cred, msg);
717 * If there is a override function,
718 * call it instead of directly routing the call
720 if (map != NULL && iomc->wrapfunc != NULL)
721 error = iomc->wrapfunc(fp, com, ocom, data, cred);
723 error = fo_ioctl(fp, com, data, cred, msg);
725 * Copy any data to user, size was
726 * already set and checked above.
728 if (error == 0 && (com & IOC_OUT) != 0 && size != 0)
729 error = copyout(data, uspc_data, (size_t)size);
734 kfree(memp, M_IOCTLOPS);
743 mapped_ioctl_register_handler(struct ioctl_map_handler *he)
745 struct ioctl_map_entry *ne;
747 KKASSERT(he != NULL && he->map != NULL && he->cmd_ranges != NULL &&
748 he->subsys != NULL && *he->subsys != '\0');
750 ne = kmalloc(sizeof(struct ioctl_map_entry), M_IOCTLMAP,
753 ne->subsys = he->subsys;
754 ne->cmd_ranges = he->cmd_ranges;
756 lwkt_gettoken(&mioctl_token);
757 LIST_INSERT_HEAD(&he->map->mapping, ne, entries);
758 lwkt_reltoken(&mioctl_token);
767 mapped_ioctl_unregister_handler(struct ioctl_map_handler *he)
769 struct ioctl_map_entry *ne;
772 KKASSERT(he != NULL && he->map != NULL && he->cmd_ranges != NULL);
774 lwkt_gettoken(&mioctl_token);
775 LIST_FOREACH(ne, &he->map->mapping, entries) {
776 if (ne->cmd_ranges == he->cmd_ranges) {
777 LIST_REMOVE(ne, entries);
778 kfree(ne, M_IOCTLMAP);
783 lwkt_reltoken(&mioctl_token);
787 static int nselcoll; /* Select collisions since boot */
789 SYSCTL_INT(_kern, OID_AUTO, nselcoll, CTLFLAG_RD, &nselcoll, 0, "");
790 static int nseldebug;
791 SYSCTL_INT(_kern, OID_AUTO, nseldebug, CTLFLAG_RW, &nseldebug, 0, "");
794 * Select system call.
799 sys_select(struct select_args *uap)
802 struct timespec *ktsp, kts;
806 * Get timeout if any.
808 if (uap->tv != NULL) {
809 error = copyin(uap->tv, &ktv, sizeof (ktv));
812 TIMEVAL_TO_TIMESPEC(&ktv, &kts);
821 error = doselect(uap->nd, uap->in, uap->ou, uap->ex, ktsp,
822 &uap->sysmsg_result);
829 * Pselect system call.
832 sys_pselect(struct pselect_args *uap)
834 struct thread *td = curthread;
835 struct lwp *lp = td->td_lwp;
836 struct timespec *ktsp, kts;
841 * Get timeout if any.
843 if (uap->ts != NULL) {
844 error = copyin(uap->ts, &kts, sizeof (kts));
853 * Install temporary signal mask if any provided.
855 if (uap->sigmask != NULL) {
856 error = copyin(uap->sigmask, &sigmask, sizeof(sigmask));
859 lwkt_gettoken(&lp->lwp_proc->p_token);
860 lp->lwp_oldsigmask = lp->lwp_sigmask;
861 SIG_CANTMASK(sigmask);
862 lp->lwp_sigmask = sigmask;
863 lwkt_reltoken(&lp->lwp_proc->p_token);
869 error = doselect(uap->nd, uap->in, uap->ou, uap->ex, ktsp,
870 &uap->sysmsg_result);
872 if (uap->sigmask != NULL) {
873 lwkt_gettoken(&lp->lwp_proc->p_token);
874 /* doselect() responsible for turning ERESTART into EINTR */
875 KKASSERT(error != ERESTART);
876 if (error == EINTR) {
878 * We can't restore the previous signal mask now
879 * because it could block the signal that interrupted
880 * us. So make a note to restore it after executing
883 lp->lwp_flags |= LWP_OLDMASK;
886 * No handler to run. Restore previous mask immediately.
888 lp->lwp_sigmask = lp->lwp_oldsigmask;
890 lwkt_reltoken(&lp->lwp_proc->p_token);
897 select_copyin(void *arg, struct kevent *kevp, int maxevents, int *events)
899 struct select_kevent_copyin_args *skap = NULL;
906 skap = (struct select_kevent_copyin_args *)arg;
908 if (*events == maxevents)
911 while (skap->active_set < COPYIN_DONE) {
912 switch (skap->active_set) {
915 * Register descriptors for the read filter
917 fdp = skap->read_set;
918 filter = EVFILT_READ;
919 fflags = NOTE_OLDAPI;
927 * Register descriptors for the write filter
929 fdp = skap->write_set;
930 filter = EVFILT_WRITE;
931 fflags = NOTE_OLDAPI;
939 * Register descriptors for the exception filter
941 fdp = skap->except_set;
942 filter = EVFILT_EXCEPT;
943 fflags = NOTE_OLDAPI | NOTE_OOB;
951 * Nothing left to register
957 while (skap->proc_fds < skap->num_fds) {
959 if (FD_ISSET(fd, fdp)) {
960 kev = &kevp[*events];
961 EV_SET(kev, fd, filter,
965 skap->lwp->lwp_kqueue_serial);
970 kprintf("select fd %d filter %d serial %d\n",
971 fd, filter, skap->lwp->lwp_kqueue_serial);
974 if (*events == maxevents)
985 select_copyout(void *arg, struct kevent *kevp, int count, int *res)
987 struct select_kevent_copyin_args *skap;
991 skap = (struct select_kevent_copyin_args *)arg;
993 for (i = 0; i < count; ++i) {
995 * Filter out and delete spurious events
997 if ((u_int)(uintptr_t)kevp[i].udata !=
998 skap->lwp->lwp_kqueue_serial) {
1000 kev.flags = EV_DISABLE|EV_DELETE;
1001 kqueue_register(&skap->lwp->lwp_kqueue, &kev);
1003 kprintf("select fd %ju mismatched serial %d\n",
1004 (uintmax_t)kevp[i].ident,
1005 skap->lwp->lwp_kqueue_serial);
1012 if (kevp[i].flags & EV_ERROR) {
1013 int error = kevp[i].data;
1018 * A bad file descriptor is considered a
1019 * fatal error for select, bail out.
1021 skap->error = error;
1027 * Select silently swallows any unknown errors
1028 * for descriptors in the read or write sets.
1030 * ALWAYS filter out EOPNOTSUPP errors from
1031 * filters (at least until all filters support
1034 * We also filter out ENODEV since dev_dkqfilter
1035 * returns ENODEV if EOPNOTSUPP is returned in an
1040 if (kevp[i].filter != EVFILT_READ &&
1041 kevp[i].filter != EVFILT_WRITE &&
1042 error != EOPNOTSUPP &&
1044 skap->error = error;
1051 kprintf("select fd %ju filter %d error %d\n",
1052 (uintmax_t)kevp[i].ident,
1053 kevp[i].filter, error);
1057 switch (kevp[i].filter) {
1059 FD_SET(kevp[i].ident, skap->read_set);
1062 FD_SET(kevp[i].ident, skap->write_set);
1065 FD_SET(kevp[i].ident, skap->except_set);
1076 * Copy select bits in from userland. Allocate kernel memory if the
1080 getbits(int bytes, fd_set *in_set, kfd_set **out_set, kfd_set *tmp_set)
1085 if (bytes < sizeof(*tmp_set))
1088 *out_set = kmalloc(bytes, M_SELECT, M_WAITOK);
1089 error = copyin(in_set, *out_set, bytes);
1098 * Copy returned select bits back out to userland.
1101 putbits(int bytes, kfd_set *in_set, fd_set *out_set)
1106 error = copyout(in_set, out_set, bytes);
1114 dotimeout_only(struct timespec *ts)
1116 return(nanosleep1(ts, NULL));
1120 * Common code for sys_select() and sys_pselect().
1122 * in, out and ex are userland pointers. ts must point to validated
1123 * kernel-side timeout value or NULL for infinite timeout. res must
1124 * point to syscall return value.
1127 doselect(int nd, fd_set *read, fd_set *write, fd_set *except,
1128 struct timespec *ts, int *res)
1130 struct proc *p = curproc;
1131 struct select_kevent_copyin_args *kap, ka;
1141 return (dotimeout_only(ts));
1143 if (nd > p->p_fd->fd_nfiles) /* limit kmalloc */
1144 nd = p->p_fd->fd_nfiles;
1147 kap->lwp = curthread->td_lwp;
1151 kap->active_set = COPYIN_READ;
1154 * Calculate bytes based on the number of __fd_mask[] array entries
1155 * multiplied by the size of __fd_mask.
1157 bytes = howmany(nd, __NFDBITS) * sizeof(__fd_mask);
1159 /* kap->read_set = NULL; not needed */
1160 kap->write_set = NULL;
1161 kap->except_set = NULL;
1163 error = getbits(bytes, read, &kap->read_set, &read_tmp);
1165 error = getbits(bytes, write, &kap->write_set, &write_tmp);
1167 error = getbits(bytes, except, &kap->except_set, &except_tmp);
1172 * NOTE: Make sure the max events passed to kern_kevent() is
1173 * effectively unlimited. (nd * 3) accomplishes this.
1175 * (*res) continues to increment as returned events are
1178 error = kern_kevent(&kap->lwp->lwp_kqueue, 0x7FFFFFFF, res, kap,
1179 select_copyin, select_copyout, ts, 0);
1181 error = putbits(bytes, kap->read_set, read);
1183 error = putbits(bytes, kap->write_set, write);
1185 error = putbits(bytes, kap->except_set, except);
1188 * An error from an individual event that should be passed
1189 * back to userland (EBADF)
1198 if (kap->read_set && kap->read_set != &read_tmp)
1199 kfree(kap->read_set, M_SELECT);
1200 if (kap->write_set && kap->write_set != &write_tmp)
1201 kfree(kap->write_set, M_SELECT);
1202 if (kap->except_set && kap->except_set != &except_tmp)
1203 kfree(kap->except_set, M_SELECT);
1205 kap->lwp->lwp_kqueue_serial += kap->num_fds;
1216 sys_poll(struct poll_args *uap)
1218 struct timespec ts, *tsp;
1221 if (uap->timeout != INFTIM) {
1222 if (uap->timeout < 0)
1224 ts.tv_sec = uap->timeout / 1000;
1225 ts.tv_nsec = (uap->timeout % 1000) * 1000 * 1000;
1231 error = dopoll(uap->nfds, uap->fds, tsp, &uap->sysmsg_result, 0);
1237 * Ppoll system call.
1242 sys_ppoll(struct ppoll_args *uap)
1244 struct thread *td = curthread;
1245 struct lwp *lp = td->td_lwp;
1246 struct timespec *ktsp, kts;
1251 * Get timeout if any.
1253 if (uap->ts != NULL) {
1254 error = copyin(uap->ts, &kts, sizeof (kts));
1263 * Install temporary signal mask if any provided.
1265 if (uap->sigmask != NULL) {
1266 error = copyin(uap->sigmask, &sigmask, sizeof(sigmask));
1269 lwkt_gettoken(&lp->lwp_proc->p_token);
1270 lp->lwp_oldsigmask = lp->lwp_sigmask;
1271 SIG_CANTMASK(sigmask);
1272 lp->lwp_sigmask = sigmask;
1273 lwkt_reltoken(&lp->lwp_proc->p_token);
1276 error = dopoll(uap->nfds, uap->fds, ktsp, &uap->sysmsg_result,
1277 ktsp != NULL ? KEVENT_TIMEOUT_PRECISE : 0);
1279 if (uap->sigmask != NULL) {
1280 lwkt_gettoken(&lp->lwp_proc->p_token);
1281 /* dopoll() responsible for turning ERESTART into EINTR */
1282 KKASSERT(error != ERESTART);
1283 if (error == EINTR) {
1285 * We can't restore the previous signal mask now
1286 * because it could block the signal that interrupted
1287 * us. So make a note to restore it after executing
1290 lp->lwp_flags |= LWP_OLDMASK;
1293 * No handler to run. Restore previous mask immediately.
1295 lp->lwp_sigmask = lp->lwp_oldsigmask;
1297 lwkt_reltoken(&lp->lwp_proc->p_token);
1304 poll_copyin(void *arg, struct kevent *kevp, int maxevents, int *events)
1306 struct poll_kevent_copyin_args *pkap;
1311 pkap = (struct poll_kevent_copyin_args *)arg;
1313 while (pkap->pfds < pkap->nfds) {
1314 pfd = &pkap->fds[pkap->pfds];
1316 /* Clear return events */
1319 /* Do not check if fd is equal to -1 */
1320 if (pfd->fd == -1) {
1326 if (pfd->events & (POLLIN | POLLRDNORM))
1328 if (pfd->events & (POLLOUT | POLLWRNORM))
1330 if (pfd->events & (POLLPRI | POLLRDBAND))
1333 if (*events + kev_count > maxevents)
1337 * NOTE: A combined serial number and poll array index is
1338 * stored in kev->udata.
1340 kev = &kevp[*events];
1341 if (pfd->events & (POLLIN | POLLRDNORM)) {
1342 EV_SET(kev++, pfd->fd, EVFILT_READ, EV_ADD|EV_ENABLE,
1343 NOTE_OLDAPI, 0, (void *)(uintptr_t)
1344 (pkap->lwp->lwp_kqueue_serial + pkap->pfds));
1346 if (pfd->events & (POLLOUT | POLLWRNORM)) {
1347 EV_SET(kev++, pfd->fd, EVFILT_WRITE, EV_ADD|EV_ENABLE,
1348 NOTE_OLDAPI, 0, (void *)(uintptr_t)
1349 (pkap->lwp->lwp_kqueue_serial + pkap->pfds));
1351 if (pfd->events & (POLLPRI | POLLRDBAND)) {
1352 EV_SET(kev++, pfd->fd, EVFILT_EXCEPT, EV_ADD|EV_ENABLE,
1353 NOTE_OLDAPI | NOTE_OOB, 0,
1355 (pkap->lwp->lwp_kqueue_serial + pkap->pfds));
1359 kprintf("poll index %d/%d fd %d events %08x serial %d\n",
1360 pkap->pfds, pkap->nfds-1, pfd->fd, pfd->events,
1361 pkap->lwp->lwp_kqueue_serial);
1365 (*events) += kev_count;
1372 poll_copyout(void *arg, struct kevent *kevp, int count, int *res)
1374 struct poll_kevent_copyin_args *pkap;
1381 pkap = (struct poll_kevent_copyin_args *)arg;
1383 for (i = 0; i < count; ++i) {
1385 * Extract the poll array index and delete spurious events.
1386 * We can easily tell if the serial number is incorrect
1387 * by checking whether the extracted index is out of range.
1389 pi = (u_int)(uintptr_t)kevp[i].udata -
1390 (u_int)pkap->lwp->lwp_kqueue_serial;
1392 if (pi >= pkap->nfds) {
1394 kev.flags = EV_DISABLE|EV_DELETE;
1395 kqueue_register(&pkap->lwp->lwp_kqueue, &kev);
1397 kprintf("poll index %d out of range against serial %d\n",
1398 pi, pkap->lwp->lwp_kqueue_serial);
1401 pfd = &pkap->fds[pi];
1402 if (kevp[i].ident == pfd->fd) {
1404 * A single descriptor may generate an error against
1405 * more than one filter, make sure to set the
1406 * appropriate flags but do not increment (*res)
1409 count_res = (pfd->revents == 0);
1410 if (kevp[i].flags & EV_ERROR) {
1411 switch(kevp[i].data) {
1414 /* Bad file descriptor */
1417 pfd->revents |= POLLNVAL;
1421 * Poll silently swallows any unknown
1422 * errors except in the case of POLLPRI
1423 * (OOB/urgent data).
1425 * ALWAYS filter out EOPNOTSUPP errors
1426 * from filters, common applications
1427 * set POLLPRI|POLLRDBAND and most
1428 * filters do not support EVFILT_EXCEPT.
1430 * We also filter out ENODEV since dev_dkqfilter
1431 * returns ENODEV if EOPNOTSUPP is returned in an
1436 if (kevp[i].filter != EVFILT_READ &&
1437 kevp[i].filter != EVFILT_WRITE &&
1438 kevp[i].data != EOPNOTSUPP &&
1439 kevp[i].data != ENODEV) {
1442 pfd->revents |= POLLERR;
1447 kprintf("poll index %d fd %d "
1448 "filter %d error %jd\n",
1451 (intmax_t)kevp[i].data);
1456 switch (kevp[i].filter) {
1460 * NODATA on the read side can indicate a
1461 * half-closed situation and not necessarily
1462 * a disconnect, so depend on the user
1463 * issuing a read() and getting 0 bytes back.
1465 if (kevp[i].flags & EV_NODATA)
1466 pfd->revents |= POLLHUP;
1468 if ((kevp[i].flags & EV_EOF) &&
1469 kevp[i].fflags != 0)
1470 pfd->revents |= POLLERR;
1471 if (pfd->events & POLLIN)
1472 pfd->revents |= POLLIN;
1473 if (pfd->events & POLLRDNORM)
1474 pfd->revents |= POLLRDNORM;
1478 * As per the OpenGroup POLLHUP is mutually
1479 * exclusive with the writability flags. I
1480 * consider this a bit broken but...
1482 * In this case a disconnect is implied even
1483 * for a half-closed (write side) situation.
1485 if (kevp[i].flags & EV_EOF) {
1486 pfd->revents |= POLLHUP;
1487 if (kevp[i].fflags != 0)
1488 pfd->revents |= POLLERR;
1490 if (pfd->events & POLLOUT)
1491 pfd->revents |= POLLOUT;
1492 if (pfd->events & POLLWRNORM)
1493 pfd->revents |= POLLWRNORM;
1498 * EV_NODATA should never be tagged for this
1501 if (pfd->events & POLLPRI)
1502 pfd->revents |= POLLPRI;
1503 if (pfd->events & POLLRDBAND)
1504 pfd->revents |= POLLRDBAND;
1509 kprintf("poll index %d/%d fd %d revents %08x\n",
1510 pi, pkap->nfds, pfd->fd, pfd->revents);
1513 if (count_res && pfd->revents)
1517 kprintf("poll index %d mismatch %ju/%d\n",
1518 pi, (uintmax_t)kevp[i].ident, pfd->fd);
1527 dopoll(int nfds, struct pollfd *fds, struct timespec *ts, int *res, int flags)
1529 struct poll_kevent_copyin_args ka;
1530 struct pollfd sfds[64];
1538 if (nfds == 0 && ts)
1539 return (dotimeout_only(ts));
1542 * This is a bit arbitrary but we need to limit internal kmallocs.
1544 if (nfds > maxfilesperproc * 2)
1545 nfds = maxfilesperproc * 2;
1546 bytes = sizeof(struct pollfd) * nfds;
1548 ka.lwp = curthread->td_lwp;
1556 ka.fds = kmalloc(bytes, M_SELECT, M_WAITOK);
1558 error = copyin(fds, ka.fds, bytes);
1560 error = kern_kevent(&ka.lwp->lwp_kqueue, 0x7FFFFFFF, res, &ka,
1561 poll_copyin, poll_copyout, ts, flags);
1564 error = copyout(ka.fds, fds, bytes);
1567 kfree(ka.fds, M_SELECT);
1569 ka.lwp->lwp_kqueue_serial += nfds;
1575 socket_wait_copyin(void *arg, struct kevent *kevp, int maxevents, int *events)
1581 socket_wait_copyout(void *arg, struct kevent *kevp, int count, int *res)
1587 extern struct fileops socketops;
1590 * NOTE: Callers of socket_wait() must already have a reference on the
1594 socket_wait(struct socket *so, struct timespec *ts, int *res)
1596 struct thread *td = curthread;
1602 if ((error = falloc(td->td_lwp, &fp, &fd)) != 0)
1605 fp->f_type = DTYPE_SOCKET;
1606 fp->f_flag = FREAD | FWRITE;
1607 fp->f_ops = &socketops;
1609 fsetfd(td->td_lwp->lwp_proc->p_fd, fp, fd);
1611 kqueue_init(&kq, td->td_lwp->lwp_proc->p_fd);
1612 EV_SET(&kev, fd, EVFILT_READ, EV_ADD|EV_ENABLE, 0, 0, NULL);
1613 if ((error = kqueue_register(&kq, &kev)) != 0) {
1618 error = kern_kevent(&kq, 1, res, NULL, socket_wait_copyin,
1619 socket_wait_copyout, ts, 0);
1621 EV_SET(&kev, fd, EVFILT_READ, EV_DELETE, 0, 0, NULL);
1622 kqueue_register(&kq, &kev);
1623 fp->f_ops = &badfileops;
1630 * OpenBSD poll system call.
1631 * XXX this isn't quite a true representation.. OpenBSD uses select ops.
1636 sys_openbsd_poll(struct openbsd_poll_args *uap)
1638 return (sys_poll((struct poll_args *)uap));
1643 seltrue(cdev_t dev, int events)
1645 return (events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM));