2 * Copyright (c) 2013-2015 Gleb Smirnoff <glebius@FreeBSD.org>
3 * Copyright (c) 1998, David Greenman. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
33 #include "opt_compat.h"
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/capsicum.h>
38 #include <sys/kernel.h>
40 #include <sys/mutex.h>
41 #include <sys/sysproto.h>
42 #include <sys/malloc.h>
45 #include <sys/mount.h>
47 #include <sys/protosw.h>
48 #include <sys/rwlock.h>
49 #include <sys/sf_buf.h>
50 #include <sys/socket.h>
51 #include <sys/socketvar.h>
52 #include <sys/syscallsubr.h>
53 #include <sys/sysctl.h>
54 #include <sys/vnode.h>
58 #include <security/audit/audit.h>
59 #include <security/mac/mac_framework.h>
62 #include <vm/vm_object.h>
63 #include <vm/vm_pager.h>
66 * Structure describing a single sendfile(2) I/O, which may consist of
67 * several underlying pager I/Os.
69 * The syscall context allocates the structure and initializes 'nios'
70 * to 1. As sendfile_swapin() runs through pages and starts asynchronous
71 * paging operations, it increments 'nios'.
73 * Every I/O completion calls sendfile_iodone(), which decrements the 'nios',
74 * and the syscall also calls sendfile_iodone() after allocating all mbufs,
75 * linking them and sending to socket. Whoever reaches zero 'nios' is
76 * responsible to * call pru_ready on the socket, to notify it of readyness
89 * Structure used to track requests with SF_SYNC flag.
91 struct sendfile_sync {
97 counter_u64_t sfstat[sizeof(struct sfstat) / sizeof(uint64_t)];
100 sfstat_init(const void *unused)
103 COUNTER_ARRAY_ALLOC(sfstat, sizeof(struct sfstat) / sizeof(uint64_t),
106 SYSINIT(sfstat, SI_SUB_MBUF, SI_ORDER_FIRST, sfstat_init, NULL);
109 sfstat_sysctl(SYSCTL_HANDLER_ARGS)
113 COUNTER_ARRAY_COPY(sfstat, &s, sizeof(s) / sizeof(uint64_t));
115 COUNTER_ARRAY_ZERO(sfstat, sizeof(s) / sizeof(uint64_t));
116 return (SYSCTL_OUT(req, &s, sizeof(s)));
118 SYSCTL_PROC(_kern_ipc, OID_AUTO, sfstat, CTLTYPE_OPAQUE | CTLFLAG_RW,
119 NULL, 0, sfstat_sysctl, "I", "sendfile statistics");
122 * Detach mapped page and release resources back to the system. Called
123 * by mbuf(9) code when last reference to a page is freed.
126 sf_ext_free(void *arg1, void *arg2)
128 struct sf_buf *sf = arg1;
129 struct sendfile_sync *sfs = arg2;
130 vm_page_t pg = sf_buf_page(sf);
136 * Check for the object going away on us. This can
137 * happen since we don't hold a reference to it.
138 * If so, we're responsible for freeing the page.
140 if (vm_page_unwire(pg, PQ_INACTIVE) && pg->object == NULL)
146 KASSERT(sfs->count > 0, ("Sendfile sync botchup count == 0"));
147 if (--sfs->count == 0)
149 mtx_unlock(&sfs->mtx);
154 * Same as above, but forces the page to be detached from the object
155 * and go into free pool.
158 sf_ext_free_nocache(void *arg1, void *arg2)
160 struct sf_buf *sf = arg1;
161 struct sendfile_sync *sfs = arg2;
162 vm_page_t pg = sf_buf_page(sf);
167 if (vm_page_unwire(pg, PQ_NONE)) {
170 /* Try to free the page, but only if it is cheap to. */
171 if ((obj = pg->object) == NULL)
173 else if (!vm_page_xbusied(pg) && VM_OBJECT_TRYWLOCK(obj)) {
175 VM_OBJECT_WUNLOCK(obj);
177 vm_page_deactivate(pg);
183 KASSERT(sfs->count > 0, ("Sendfile sync botchup count == 0"));
184 if (--sfs->count == 0)
186 mtx_unlock(&sfs->mtx);
191 * Helper function to calculate how much data to put into page i of n.
192 * Only first and last pages are special.
195 xfsize(int i, int n, off_t off, off_t len)
199 return (omin(PAGE_SIZE - (off & PAGE_MASK), len));
201 if (i == n - 1 && ((off + len) & PAGE_MASK) > 0)
202 return ((off + len) & PAGE_MASK);
208 * Helper function to get offset within object for i page.
210 static inline vm_offset_t
211 vmoff(int i, off_t off)
215 return ((vm_offset_t)off);
217 return (trunc_page(off + i * PAGE_SIZE));
221 * Helper function used when allocation of a page or sf_buf failed.
222 * Pretend as if we don't have enough space, subtract xfsize() of
223 * all pages that failed.
226 fixspace(int old, int new, off_t off, int *space)
229 KASSERT(old > new, ("%s: old %d new %d", __func__, old, new));
231 /* Subtract last one. */
232 *space -= xfsize(old - 1, old, off, *space);
236 /* There was only one page. */
239 /* Subtract first one. */
241 *space -= xfsize(0, old, off, *space);
245 /* Rest of pages are full sized. */
246 *space -= (old - new) * PAGE_SIZE;
248 KASSERT(*space >= 0, ("%s: space went backwards", __func__));
252 * I/O completion callback.
255 sendfile_iodone(void *arg, vm_page_t *pg, int count, int error)
257 struct sf_io *sfio = arg;
260 for (int i = 0; i < count; i++)
261 if (pg[i] != bogus_page)
262 vm_page_xunbusy(pg[i]);
267 if (!refcount_release(&sfio->nios))
270 so = sfio->sock_fp->f_data;
276 * I/O operation failed. The state of data in the socket
277 * is now inconsistent, and all what we can do is to tear
278 * it down. Protocol abort method would tear down protocol
279 * state, free all ready mbufs and detach not ready ones.
280 * We will free the mbufs corresponding to this I/O manually.
282 * The socket would be marked with EIO and made available
283 * for read, so that application receives EIO on next
284 * syscall and eventually closes the socket.
286 so->so_proto->pr_usrreqs->pru_abort(so);
290 for (int i = 0; i < sfio->npages; i++)
293 CURVNET_SET(so->so_vnet);
294 (void )(so->so_proto->pr_usrreqs->pru_ready)(so, sfio->m,
299 /* XXXGL: curthread */
300 fdrop(sfio->sock_fp, curthread);
305 * Iterate through pages vector and request paging for non-valid pages.
308 sendfile_swapin(vm_object_t obj, struct sf_io *sfio, off_t off, off_t len,
309 int npages, int rhpages, int flags)
311 vm_page_t *pa = sfio->pa;
315 flags = (flags & SF_NODISKIO) ? VM_ALLOC_NOWAIT : 0;
318 * First grab all the pages and wire them. Note that we grab
319 * only required pages. Readahead pages are dealt with later.
321 VM_OBJECT_WLOCK(obj);
322 for (int i = 0; i < npages; i++) {
323 pa[i] = vm_page_grab(obj, OFF_TO_IDX(vmoff(i, off)),
324 VM_ALLOC_WIRED | VM_ALLOC_NORMAL | flags);
332 for (int i = 0; i < npages;) {
335 /* Skip valid pages. */
336 if (vm_page_is_valid(pa[i], vmoff(i, off) & PAGE_MASK,
337 xfsize(i, npages, off, len))) {
338 vm_page_xunbusy(pa[i]);
339 SFSTAT_INC(sf_pages_valid);
345 * Next page is invalid. Check if it belongs to pager. It
346 * may not be there, which is a regular situation for shmem
347 * pager. For vnode pager this happens only in case of
350 * Important feature of vm_pager_has_page() is the hint
351 * stored in 'a', about how many pages we can pagein after
352 * this page in a single I/O.
354 if (!vm_pager_has_page(obj, OFF_TO_IDX(vmoff(i, off)), NULL,
356 pmap_zero_page(pa[i]);
357 pa[i]->valid = VM_PAGE_BITS_ALL;
359 vm_page_xunbusy(pa[i]);
365 * We want to pagein as many pages as possible, limited only
366 * by the 'a' hint and actual request.
368 count = min(a + 1, npages - i);
371 * We should not pagein into a valid page, thus we first trim
372 * any valid pages off the end of request, and substitute
373 * to bogus_page those, that are in the middle.
375 for (j = i + count - 1; j > i; j--) {
376 if (vm_page_is_valid(pa[j], vmoff(j, off) & PAGE_MASK,
377 xfsize(j, npages, off, len))) {
383 for (j = i + 1; j < i + count - 1; j++)
384 if (vm_page_is_valid(pa[j], vmoff(j, off) & PAGE_MASK,
385 xfsize(j, npages, off, len))) {
386 vm_page_xunbusy(pa[j]);
387 SFSTAT_INC(sf_pages_valid);
388 SFSTAT_INC(sf_pages_bogus);
392 refcount_acquire(&sfio->nios);
393 rv = vm_pager_get_pages_async(obj, pa + i, count, NULL,
394 i + count == npages ? &rhpages : NULL,
395 &sendfile_iodone, sfio);
396 KASSERT(rv == VM_PAGER_OK, ("%s: pager fail obj %p page %p",
397 __func__, obj, pa[i]));
399 SFSTAT_INC(sf_iocnt);
400 SFSTAT_ADD(sf_pages_read, count);
401 if (i + count == npages)
402 SFSTAT_ADD(sf_rhpages_read, rhpages);
405 * Restore the valid page pointers. They are already
406 * unbusied, but still wired.
408 for (j = i; j < i + count; j++)
409 if (pa[j] == bogus_page) {
410 pa[j] = vm_page_lookup(obj,
411 OFF_TO_IDX(vmoff(j, off)));
412 KASSERT(pa[j], ("%s: page %p[%d] disappeared",
420 VM_OBJECT_WUNLOCK(obj);
422 if (nios == 0 && npages != 0)
423 SFSTAT_INC(sf_noiocnt);
429 sendfile_getobj(struct thread *td, struct file *fp, vm_object_t *obj_res,
430 struct vnode **vp_res, struct shmfd **shmfd_res, off_t *obj_size,
441 shmfd = *shmfd_res = NULL;
445 * The file descriptor must be a regular file and have a
448 if (fp->f_type == DTYPE_VNODE) {
450 vn_lock(vp, LK_SHARED | LK_RETRY);
451 if (vp->v_type != VREG) {
455 *bsize = vp->v_mount->mnt_stat.f_iosize;
456 error = VOP_GETATTR(vp, &va, td->td_ucred);
459 *obj_size = va.va_size;
465 } else if (fp->f_type == DTYPE_SHM) {
468 obj = shmfd->shm_object;
469 *obj_size = shmfd->shm_size;
475 VM_OBJECT_WLOCK(obj);
476 if ((obj->flags & OBJ_DEAD) != 0) {
477 VM_OBJECT_WUNLOCK(obj);
483 * Temporarily increase the backing VM object's reference
484 * count so that a forced reclamation of its vnode does not
485 * immediately destroy it.
487 vm_object_reference_locked(obj);
488 VM_OBJECT_WUNLOCK(obj);
500 sendfile_getsock(struct thread *td, int s, struct file **sock_fp,
510 * The socket must be a stream socket and connected.
512 error = getsock_cap(td, s, cap_rights_init(&rights, CAP_SEND),
513 sock_fp, NULL, NULL);
516 *so = (*sock_fp)->f_data;
517 if ((*so)->so_type != SOCK_STREAM)
519 if (((*so)->so_state & SS_ISCONNECTED) == 0)
525 vn_sendfile(struct file *fp, int sockfd, struct uio *hdr_uio,
526 struct uio *trl_uio, off_t offset, size_t nbytes, off_t *sent, int flags,
529 struct file *sock_fp;
531 struct vm_object *obj;
533 struct mbuf *m, *mh, *mhtail;
536 struct sendfile_sync *sfs;
538 off_t off, sbytes, rem, obj_size;
539 int error, softerr, bsize, hdrlen;
548 error = sendfile_getobj(td, fp, &obj, &vp, &shmfd, &obj_size, &bsize);
552 error = sendfile_getsock(td, sockfd, &sock_fp, &so);
557 error = mac_socket_check_send(td->td_ucred, so);
562 SFSTAT_INC(sf_syscalls);
563 SFSTAT_ADD(sf_rhpages_requested, SF_READAHEAD(flags));
565 if (flags & SF_SYNC) {
566 sfs = malloc(sizeof *sfs, M_TEMP, M_WAITOK | M_ZERO);
567 mtx_init(&sfs->mtx, "sendfile", NULL, MTX_DEF);
568 cv_init(&sfs->cv, "sendfile");
571 rem = nbytes ? omin(nbytes, obj_size - offset) : obj_size - offset;
574 * Protect against multiple writers to the socket.
576 * XXXRW: Historically this has assumed non-interruptibility, so now
577 * we implement that, but possibly shouldn't.
579 (void)sblock(&so->so_snd, SBL_WAIT | SBL_NOINTR);
582 * Loop through the pages of the file, starting with the requested
583 * offset. Get a file page (do I/O if necessary), map the file page
584 * into an sf_buf, attach an mbuf header to the sf_buf, and queue
586 * This is done in two loops. The inner loop turns as many pages
587 * as it can, up to available socket buffer space, without blocking
588 * into mbufs to have it bulk delivered into the socket send buffer.
589 * The outer loop checks the state and available space of the socket
590 * and takes care of the overall progress.
592 for (off = offset; rem > 0; ) {
596 int nios, space, npages, rhpages;
600 * Check the socket state for ongoing connection,
601 * no errors and space in socket buffer.
602 * If space is low allow for the remainder of the
603 * file to be processed if it fits the socket buffer.
604 * Otherwise block in waiting for sufficient space
605 * to proceed, or if the socket is nonblocking, return
606 * to userland with EAGAIN while reporting how far
608 * We wait until the socket buffer has significant free
609 * space to do bulk sends. This makes good use of file
610 * system read ahead and allows packet segmentation
611 * offloading hardware to take over lots of work. If
612 * we were not careful here we would send off only one
615 SOCKBUF_LOCK(&so->so_snd);
616 if (so->so_snd.sb_lowat < so->so_snd.sb_hiwat / 2)
617 so->so_snd.sb_lowat = so->so_snd.sb_hiwat / 2;
619 if (so->so_snd.sb_state & SBS_CANTSENDMORE) {
621 SOCKBUF_UNLOCK(&so->so_snd);
623 } else if (so->so_error) {
624 error = so->so_error;
626 SOCKBUF_UNLOCK(&so->so_snd);
629 space = sbspace(&so->so_snd);
632 space < so->so_snd.sb_lowat)) {
633 if (so->so_state & SS_NBIO) {
634 SOCKBUF_UNLOCK(&so->so_snd);
639 * sbwait drops the lock while sleeping.
640 * When we loop back to retry_space the
641 * state may have changed and we retest
644 error = sbwait(&so->so_snd);
646 * An error from sbwait usually indicates that we've
647 * been interrupted by a signal. If we've sent anything
648 * then return bytes sent, otherwise return the error.
651 SOCKBUF_UNLOCK(&so->so_snd);
656 SOCKBUF_UNLOCK(&so->so_snd);
659 * At the beginning of the first loop check if any headers
660 * are specified and copy them into mbufs. Reduce space in
661 * the socket buffer by the size of the header mbuf chain.
662 * Clear hdr_uio here and hdrlen at the end of the first loop.
664 if (hdr_uio != NULL && hdr_uio->uio_resid > 0) {
665 hdr_uio->uio_td = td;
666 hdr_uio->uio_rw = UIO_WRITE;
667 mh = m_uiotombuf(hdr_uio, M_WAITOK, space, 0, 0);
668 hdrlen = m_length(mh, &mhtail);
671 * If header consumed all the socket buffer space,
672 * don't waste CPU cycles and jump to the end.
683 error = vn_lock(vp, LK_SHARED);
686 error = VOP_GETATTR(vp, &va, td->td_ucred);
687 if (error != 0 || off >= va.va_size) {
691 if (va.va_size != obj_size) {
693 rem += va.va_size - obj_size;
694 else if (offset + nbytes > va.va_size)
695 rem -= (offset + nbytes - va.va_size);
696 obj_size = va.va_size;
703 npages = howmany(space + (off & PAGE_MASK), PAGE_SIZE);
706 * Calculate maximum allowed number of pages for readahead
707 * at this iteration. If SF_USER_READAHEAD was set, we don't
708 * do any heuristics and use exactly the value supplied by
709 * application. Otherwise, we allow readahead up to "rem".
710 * If application wants more, let it be, but there is no
711 * reason to go above MAXPHYS. Also check against "obj_size",
712 * since vm_pager_has_page() can hint beyond EOF.
714 if (flags & SF_USER_READAHEAD) {
715 rhpages = SF_READAHEAD(flags);
717 rhpages = howmany(rem + (off & PAGE_MASK), PAGE_SIZE) -
719 rhpages += SF_READAHEAD(flags);
721 rhpages = min(howmany(MAXPHYS, PAGE_SIZE), rhpages);
722 rhpages = min(howmany(obj_size - trunc_page(off), PAGE_SIZE) -
725 sfio = malloc(sizeof(struct sf_io) +
726 npages * sizeof(vm_page_t), M_TEMP, M_WAITOK);
727 refcount_init(&sfio->nios, 1);
730 nios = sendfile_swapin(obj, sfio, off, space, npages, rhpages,
734 * Loop and construct maximum sized mbuf chain to be bulk
735 * dumped into socket buffer.
738 for (int i = 0; i < npages; i++) {
742 * If a page wasn't grabbed successfully, then
743 * trim the array. Can happen only with SF_NODISKIO.
747 fixspace(npages, i, off, &space);
754 * Get a sendfile buf. When allocating the
755 * first buffer for mbuf chain, we usually
756 * wait as long as necessary, but this wait
757 * can be interrupted. For consequent
758 * buffers, do not sleep, since several
759 * threads might exhaust the buffers and then
762 sf = sf_buf_alloc(pa[i],
763 m != NULL ? SFB_NOWAIT : SFB_CATCH);
765 SFSTAT_INC(sf_allocfail);
766 for (int j = i; j < npages; j++) {
768 vm_page_unwire(pa[j], PQ_INACTIVE);
769 vm_page_unlock(pa[j]);
773 fixspace(npages, i, off, &space);
778 m0 = m_get(M_WAITOK, MT_DATA);
779 m0->m_ext.ext_buf = (char *)sf_buf_kva(sf);
780 m0->m_ext.ext_size = PAGE_SIZE;
781 m0->m_ext.ext_arg1 = sf;
782 m0->m_ext.ext_arg2 = sfs;
784 * SF_NOCACHE sets the page as being freed upon send.
785 * However, we ignore it for the last page in 'space',
786 * if the page is truncated, and we got more data to
787 * send (rem > space), or if we have readahead
788 * configured (rhpages > 0).
790 if ((flags & SF_NOCACHE) == 0 ||
792 ((off + space) & PAGE_MASK) &&
793 (rem > space || rhpages > 0)))
794 m0->m_ext.ext_type = EXT_SFBUF;
796 m0->m_ext.ext_type = EXT_SFBUF_NOCACHE;
797 m0->m_ext.ext_flags = EXT_FLAG_EMBREF;
798 m0->m_ext.ext_count = 1;
799 m0->m_flags |= (M_EXT | M_RDONLY);
801 m0->m_flags |= M_NOTREADY;
802 m0->m_data = (char *)sf_buf_kva(sf) +
803 (vmoff(i, off) & PAGE_MASK);
804 m0->m_len = xfsize(i, npages, off, space);
809 /* Append to mbuf chain. */
819 mtx_unlock(&sfs->mtx);
826 /* Keep track of bytes processed. */
830 /* Prepend header, if any. */
839 KASSERT(softerr, ("%s: m NULL, no error", __func__));
845 /* Add the buffer chain to the socket buffer. */
846 KASSERT(m_length(m, NULL) == space + hdrlen,
847 ("%s: mlen %u space %d hdrlen %d",
848 __func__, m_length(m, NULL), space, hdrlen));
850 CURVNET_SET(so->so_vnet);
853 * If sendfile_swapin() didn't initiate any I/Os,
854 * which happens if all data is cached in VM, then
855 * we can send data right now without the
856 * PRUS_NOTREADY flag.
859 error = (*so->so_proto->pr_usrreqs->pru_send)
860 (so, 0, m, NULL, NULL, td);
862 sfio->sock_fp = sock_fp;
863 sfio->npages = npages;
865 error = (*so->so_proto->pr_usrreqs->pru_send)
866 (so, PRUS_NOTREADY, m, NULL, NULL, td);
867 sendfile_iodone(sfio, NULL, 0, 0);
871 m = NULL; /* pru_send always consumes */
874 sbytes += space + hdrlen;
884 * Send trailers. Wimp out and use writev(2).
886 if (trl_uio != NULL) {
887 sbunlock(&so->so_snd);
888 error = kern_writev(td, sockfd, trl_uio);
890 sbytes += td->td_retval[0];
895 sbunlock(&so->so_snd);
898 * If there was no error we have to clear td->td_retval[0]
899 * because it may have been set by writev.
902 td->td_retval[0] = 0;
908 vm_object_deallocate(obj);
919 cv_wait(&sfs->cv, &sfs->mtx);
920 KASSERT(sfs->count == 0, ("sendfile sync still busy"));
921 cv_destroy(&sfs->cv);
922 mtx_destroy(&sfs->mtx);
926 if (error == ERESTART)
933 sendfile(struct thread *td, struct sendfile_args *uap, int compat)
936 struct uio *hdr_uio, *trl_uio;
943 * File offset must be positive. If it goes beyond EOF
944 * we send only the header/trailer and no payload data.
949 hdr_uio = trl_uio = NULL;
951 if (uap->hdtr != NULL) {
952 error = copyin(uap->hdtr, &hdtr, sizeof(hdtr));
955 if (hdtr.headers != NULL) {
956 error = copyinuio(hdtr.headers, hdtr.hdr_cnt,
960 #ifdef COMPAT_FREEBSD4
962 * In FreeBSD < 5.0 the nbytes to send also included
963 * the header. If compat is specified subtract the
964 * header size from nbytes.
967 if (uap->nbytes > hdr_uio->uio_resid)
968 uap->nbytes -= hdr_uio->uio_resid;
974 if (hdtr.trailers != NULL) {
975 error = copyinuio(hdtr.trailers, hdtr.trl_cnt,
982 AUDIT_ARG_FD(uap->fd);
985 * sendfile(2) can start at any offset within a file so we require
986 * CAP_READ+CAP_SEEK = CAP_PREAD.
988 if ((error = fget_read(td, uap->fd,
989 cap_rights_init(&rights, CAP_PREAD), &fp)) != 0) {
993 error = fo_sendfile(fp, uap->s, hdr_uio, trl_uio, uap->offset,
994 uap->nbytes, &sbytes, uap->flags, td);
997 if (uap->sbytes != NULL)
998 copyout(&sbytes, uap->sbytes, sizeof(off_t));
1001 free(hdr_uio, M_IOV);
1002 free(trl_uio, M_IOV);
1009 * int sendfile(int fd, int s, off_t offset, size_t nbytes,
1010 * struct sf_hdtr *hdtr, off_t *sbytes, int flags)
1012 * Send a file specified by 'fd' and starting at 'offset' to a socket
1013 * specified by 's'. Send only 'nbytes' of the file or until EOF if nbytes ==
1014 * 0. Optionally add a header and/or trailer to the socket output. If
1015 * specified, write the total number of bytes sent into *sbytes.
1018 sys_sendfile(struct thread *td, struct sendfile_args *uap)
1021 return (sendfile(td, uap, 0));
1024 #ifdef COMPAT_FREEBSD4
1026 freebsd4_sendfile(struct thread *td, struct freebsd4_sendfile_args *uap)
1028 struct sendfile_args args;
1032 args.offset = uap->offset;
1033 args.nbytes = uap->nbytes;
1034 args.hdtr = uap->hdtr;
1035 args.sbytes = uap->sbytes;
1036 args.flags = uap->flags;
1038 return (sendfile(td, &args, 1));
1040 #endif /* COMPAT_FREEBSD4 */