100#include <sys/fcntl.h>
102#include <sys/filedesc.h>
103#include <sys/filio.h>
104#include <sys/kernel.h>
106#include <sys/mutex.h>
107#include <sys/ttycom.h>
109#include <sys/malloc.h>
111#include <sys/selinfo.h>
112#include <sys/signalvar.h>
113#include <sys/syscallsubr.h>
114#include <sys/sysctl.h>
115#include <sys/sysproto.h>
118#include <sys/vnode.h>
121#include <sys/event.h>
123#include <security/mac/mac_framework.h>
126#include <vm/vm_param.h>
127#include <vm/vm_object.h>
128#include <vm/vm_kern.h>
129#include <vm/vm_extern.h>
131#include <vm/vm_map.h>
132#include <vm/vm_page.h>
142#define PIPE_PEER(pipe) \
143 (((pipe)->pipe_type & PIPE_TYPE_NAMED) ? (pipe) : ((pipe)->pipe_peer))
173 .fo_flags = DFLAG_PASSABLE
204#define MINPIPESIZE (PIPE_SIZE/3)
205#define MAXPIPESIZE (2*PIPE_SIZE/3)
219 &
pipefragretry, 0,
"Pipe allocation retries due to fragmentation");
228static void pipeclose(
struct pipe *cpipe);
230static int pipe_create(
struct pipe *pipe,
bool backing);
232static __inline
int pipelock(
struct pipe *cpipe,
int catch);
233static __inline
void pipeunlock(
struct pipe *cpipe);
241static int pipespace(
struct pipe *cpipe,
int size);
258 pipe_zone = uma_zcreate(
"pipe",
sizeof(
struct pipepair),
261 KASSERT(
pipe_zone != NULL, (
"pipe_zone not initialized"));
264 KASSERT(
pipedev_ino > 0, (
"pipe dev inode not initialized"));
274 if (error != 0 || req->newptr == NULL)
281 if (tmp_pipe_mindirect <= PIPE_BUF)
288 "Minimum write size triggering VM optimization");
294 struct pipe *rpipe, *wpipe;
296 KASSERT(size ==
sizeof(*pp), (
"pipe_zone_ctor: wrong size"));
298 pp = (
struct pipepair *)mem;
305 rpipe = &pp->pp_rpipe;
306 bzero(rpipe,
sizeof(*rpipe));
308 rpipe->pipe_atime = rpipe->pipe_mtime = rpipe->pipe_ctime;
310 wpipe = &pp->pp_wpipe;
311 bzero(wpipe,
sizeof(*wpipe));
312 wpipe->pipe_ctime = rpipe->pipe_ctime;
313 wpipe->pipe_atime = wpipe->pipe_mtime = rpipe->pipe_ctime;
315 rpipe->pipe_peer = wpipe;
316 rpipe->pipe_pair = pp;
317 wpipe->pipe_peer = rpipe;
318 wpipe->pipe_pair = pp;
325 rpipe->pipe_present = PIPE_ACTIVE;
326 wpipe->pipe_present = PIPE_ACTIVE;
343 KASSERT(size ==
sizeof(*pp), (
"pipe_zone_init: wrong size"));
345 pp = (
struct pipepair *)mem;
347 mtx_init(&pp->pp_mtx,
"pipe mutex", NULL, MTX_DEF | MTX_NEW);
356 KASSERT(size ==
sizeof(*pp), (
"pipe_zone_fini: wrong size"));
358 pp = (
struct pipepair *)mem;
360 mtx_destroy(&pp->pp_mtx);
367 struct pipe *rpipe, *wpipe;
370 *p_pp = pp = uma_zalloc(
pipe_zone, M_WAITOK);
378 mac_pipe_create(td->td_ucred, pp);
380 rpipe = &pp->pp_rpipe;
381 wpipe = &pp->pp_wpipe;
408 rpipe->pipe_state |= PIPE_DIRECTOK;
409 wpipe->pipe_state |= PIPE_DIRECTOK;
416 mac_pipe_destroy(pp);
431 pp->pp_rpipe.pipe_type |= PIPE_TYPE_NAMED;
432 *ppipe = &pp->pp_rpipe;
441 peer = (dpipe->pipe_type & PIPE_TYPE_NAMED) != 0 ? dpipe->pipe_peer : NULL;
470 struct filecaps *fcaps2)
472 struct file *rf, *wf;
473 struct pipe *rpipe, *wpipe;
475 int fd, fflags, error;
480 rpipe = &pp->pp_rpipe;
481 wpipe = &pp->pp_wpipe;
491 fflags = FREAD | FWRITE;
492 if ((
flags & O_NONBLOCK) != 0)
519#ifdef COMPAT_FREEBSD10
522freebsd10_pipe(
struct thread *td,
struct freebsd10_pipe_args *uap __unused)
527 error =
kern_pipe(td, fildes, 0, NULL, NULL);
531 td->td_retval[0] = fildes[0];
532 td->td_retval[1] = fildes[1];
541 int error, fildes[2];
543 if (uap->flags & ~(O_CLOEXEC | O_NONBLOCK))
545 error =
kern_pipe(td, fildes, uap->flags, NULL, NULL);
548 error = copyout(fildes, uap->fildes, 2 *
sizeof(
int));
566 int error, cnt, firstseg;
567 static int curfail = 0;
568 static struct timeval lastfail;
570 KASSERT(!mtx_owned(PIPE_MTX(cpipe)), (
"pipespace: pipe mutex locked"));
571 KASSERT(!(cpipe->pipe_state & PIPE_DIRECTW),
572 (
"pipespace: resize of direct writes not allowed"));
574 cnt = cpipe->pipe_buffer.cnt;
578 size = round_page(size);
579 buffer = (caddr_t) vm_map_min(pipe_map);
581 error = vm_map_find(pipe_map, NULL, 0, (vm_offset_t *)&buffer, size, 0,
582 VMFS_ANY_SPACE, VM_PROT_RW, VM_PROT_RW, 0);
583 if (error != KERN_SUCCESS) {
584 if (cpipe->pipe_buffer.buffer == NULL &&
585 size > SMALL_PIPE_SIZE) {
586 size = SMALL_PIPE_SIZE;
590 if (cpipe->pipe_buffer.buffer == NULL) {
593 printf(
"kern.ipc.maxpipekva exceeded; see tuning(7)\n");
602 if (cpipe->pipe_buffer.in <= cpipe->pipe_buffer.out) {
603 firstseg = cpipe->pipe_buffer.size - cpipe->pipe_buffer.out;
604 bcopy(&cpipe->pipe_buffer.buffer[cpipe->pipe_buffer.out],
606 if ((cnt - firstseg) > 0)
607 bcopy(cpipe->pipe_buffer.buffer, &buffer[firstseg],
608 cpipe->pipe_buffer.in);
610 bcopy(&cpipe->pipe_buffer.buffer[cpipe->pipe_buffer.out],
615 cpipe->pipe_buffer.buffer = buffer;
616 cpipe->pipe_buffer.size = size;
617 cpipe->pipe_buffer.in = cnt;
618 cpipe->pipe_buffer.out = 0;
619 cpipe->pipe_buffer.cnt = cnt;
631 KASSERT(cpipe->pipe_state & PIPE_LOCKFL,
632 (
"Unlocked pipe passed to pipespace"));
644 PIPE_LOCK_ASSERT(cpipe, MA_OWNED);
649 while (cpipe->pipe_state & PIPE_LOCKFL) {
650 KASSERT(cpipe->pipe_waiters >= 0,
651 (
"%s: bad waiter count %d", __func__,
652 cpipe->pipe_waiters));
653 cpipe->pipe_waiters++;
654 error = msleep(cpipe, PIPE_MTX(cpipe),
656 cpipe->pipe_waiters--;
660 cpipe->pipe_state |= PIPE_LOCKFL;
671 PIPE_LOCK_ASSERT(cpipe, MA_OWNED);
672 KASSERT(cpipe->pipe_state & PIPE_LOCKFL,
673 (
"Unlocked pipe passed to pipeunlock"));
674 KASSERT(cpipe->pipe_waiters >= 0,
675 (
"%s: bad waiter count %d", __func__,
676 cpipe->pipe_waiters));
677 cpipe->pipe_state &= ~PIPE_LOCKFL;
678 if (cpipe->pipe_waiters > 0) {
687 PIPE_LOCK_ASSERT(cpipe, MA_OWNED);
688 if (cpipe->pipe_state & PIPE_SEL) {
690 if (!SEL_WAITING(&cpipe->pipe_sel))
691 cpipe->pipe_state &= ~PIPE_SEL;
693 if ((cpipe->pipe_state & PIPE_ASYNC) && cpipe->pipe_sigio)
694 pgsigio(&cpipe->pipe_sigio, SIGIO, 0);
695 KNOTE_LOCKED(&cpipe->pipe_sel.si_note, 0);
708 maxpipekva / 2 ? SMALL_PIPE_SIZE : PIPE_SIZE);
716pipe_read(
struct file *fp,
struct uio *uio,
struct ucred *active_cred,
717 int flags,
struct thread *td)
732 error = mac_pipe_check_read(active_cred, rpipe->pipe_pair);
737 if ((rpipe->pipe_state & PIPE_DIRECTW) == 0 &&
738 rpipe->pipe_buffer.size > SMALL_PIPE_SIZE &&
739 rpipe->pipe_buffer.cnt <= SMALL_PIPE_SIZE &&
747 while (uio->uio_resid) {
751 if (rpipe->pipe_buffer.cnt > 0) {
752 size = rpipe->pipe_buffer.size - rpipe->pipe_buffer.out;
753 if (size > rpipe->pipe_buffer.cnt)
754 size = rpipe->pipe_buffer.cnt;
755 if (size > uio->uio_resid)
756 size = uio->uio_resid;
760 &rpipe->pipe_buffer.buffer[rpipe->pipe_buffer.out],
766 rpipe->pipe_buffer.out += size;
767 if (rpipe->pipe_buffer.out >= rpipe->pipe_buffer.size)
768 rpipe->pipe_buffer.out = 0;
770 rpipe->pipe_buffer.cnt -= size;
777 if (rpipe->pipe_buffer.cnt == 0) {
778 rpipe->pipe_buffer.in = 0;
779 rpipe->pipe_buffer.out = 0;
786 }
else if ((size = rpipe->pipe_pages.cnt) != 0) {
787 if (size > uio->uio_resid)
788 size = (u_int) uio->uio_resid;
790 error = uiomove_fromphys(rpipe->pipe_pages.ms,
791 rpipe->pipe_pages.pos, size, uio);
796 rpipe->pipe_pages.pos += size;
797 rpipe->pipe_pages.cnt -= size;
798 if (rpipe->pipe_pages.cnt == 0) {
799 rpipe->pipe_state &= ~PIPE_WANTW;
808 if (rpipe->pipe_state & PIPE_EOF)
814 if (rpipe->pipe_state & PIPE_WANTW) {
815 rpipe->pipe_state &= ~PIPE_WANTW;
836 if (fp->f_flag & FNONBLOCK) {
839 rpipe->pipe_state |= PIPE_WANTR;
840 if ((error = msleep(rpipe, PIPE_MTX(rpipe),
863 if ((rpipe->pipe_busy == 0) && (rpipe->pipe_state & PIPE_WANT)) {
864 rpipe->pipe_state &= ~(PIPE_WANT|PIPE_WANTW);
870 if (rpipe->pipe_state & PIPE_WANTW) {
871 rpipe->pipe_state &= ~PIPE_WANTW;
881 rpipe->pipe_buffer.size - rpipe->pipe_buffer.cnt >= PIPE_BUF)
886 td->td_ru.ru_msgrcv++;
901 PIPE_LOCK_ASSERT(wpipe, MA_OWNED);
902 KASSERT((wpipe->pipe_state & PIPE_DIRECTW) == 0,
903 (
"%s: PIPE_DIRECTW set on %p", __func__, wpipe));
904 KASSERT(wpipe->pipe_pages.cnt == 0,
905 (
"%s: pipe map for %p contains residual data", __func__, wpipe));
907 if (uio->uio_iov->iov_len > wpipe->pipe_buffer.size)
908 size = wpipe->pipe_buffer.size;
910 size = uio->uio_iov->iov_len;
912 wpipe->pipe_state |= PIPE_DIRECTW;
914 i = vm_fault_quick_hold_pages(&curproc->p_vmspace->vm_map,
915 (vm_offset_t)uio->uio_iov->iov_base, size, VM_PROT_READ,
916 wpipe->pipe_pages.ms, PIPENPAGES);
919 wpipe->pipe_state &= ~PIPE_DIRECTW;
923 wpipe->pipe_pages.npages = i;
924 wpipe->pipe_pages.pos =
925 ((vm_offset_t) uio->uio_iov->iov_base) & PAGE_MASK;
926 wpipe->pipe_pages.cnt = size;
928 uio->uio_iov->iov_len -= size;
929 uio->uio_iov->iov_base = (
char *)uio->uio_iov->iov_base + size;
930 if (uio->uio_iov->iov_len == 0)
932 uio->uio_resid -= size;
933 uio->uio_offset += size;
944 PIPE_LOCK_ASSERT(wpipe, MA_OWNED);
945 KASSERT((wpipe->pipe_state & PIPE_DIRECTW) != 0,
946 (
"%s: PIPE_DIRECTW not set on %p", __func__, wpipe));
947 KASSERT(wpipe->pipe_pages.cnt == 0,
948 (
"%s: pipe map for %p contains residual data", __func__, wpipe));
950 wpipe->pipe_state &= ~PIPE_DIRECTW;
951 vm_page_unhold_pages(wpipe->pipe_pages.ms, wpipe->pipe_pages.npages);
952 wpipe->pipe_pages.npages = 0;
968 PIPE_LOCK_ASSERT(wpipe, MA_OWNED);
969 KASSERT((wpipe->pipe_state & PIPE_DIRECTW) != 0,
970 (
"%s: PIPE_DIRECTW not set on %p", __func__, wpipe));
972 size = wpipe->pipe_pages.cnt;
973 pos = wpipe->pipe_pages.pos;
974 wpipe->pipe_pages.cnt = 0;
976 wpipe->pipe_buffer.in = size;
977 wpipe->pipe_buffer.out = 0;
978 wpipe->pipe_buffer.cnt = size;
981 iov.iov_base = wpipe->pipe_buffer.buffer;
986 uio.uio_resid = size;
987 uio.uio_segflg = UIO_SYSSPACE;
988 uio.uio_rw = UIO_READ;
989 uio.uio_td = curthread;
990 uiomove_fromphys(wpipe->pipe_pages.ms, pos, size, &uio);
1008 PIPE_LOCK_ASSERT(wpipe, MA_OWNED);
1009 if ((wpipe->pipe_state & PIPE_EOF) != 0) {
1013 if (wpipe->pipe_state & PIPE_DIRECTW) {
1014 if (wpipe->pipe_state & PIPE_WANTR) {
1015 wpipe->pipe_state &= ~PIPE_WANTR;
1019 wpipe->pipe_state |= PIPE_WANTW;
1021 error = msleep(wpipe, PIPE_MTX(wpipe),
1022 PRIBIO | PCATCH,
"pipdww", 0);
1028 if (wpipe->pipe_buffer.cnt > 0) {
1029 if (wpipe->pipe_state & PIPE_WANTR) {
1030 wpipe->pipe_state &= ~PIPE_WANTR;
1034 wpipe->pipe_state |= PIPE_WANTW;
1036 error = msleep(wpipe, PIPE_MTX(wpipe),
1037 PRIBIO | PCATCH,
"pipdwc", 0);
1049 while (wpipe->pipe_pages.cnt != 0 &&
1050 (wpipe->pipe_state & PIPE_EOF) == 0) {
1051 if (wpipe->pipe_state & PIPE_WANTR) {
1052 wpipe->pipe_state &= ~PIPE_WANTR;
1056 wpipe->pipe_state |= PIPE_WANTW;
1058 error = msleep(wpipe, PIPE_MTX(wpipe), PRIBIO | PCATCH,
1065 if ((wpipe->pipe_state & PIPE_EOF) != 0) {
1066 wpipe->pipe_pages.cnt = 0;
1070 }
else if (error == EINTR || error == ERESTART) {
1075 KASSERT((wpipe->pipe_state & PIPE_DIRECTW) == 0,
1076 (
"pipe %p leaked PIPE_DIRECTW", wpipe));
1086pipe_write(
struct file *fp,
struct uio *uio,
struct ucred *active_cred,
1087 int flags,
struct thread *td)
1089 struct pipe *wpipe, *rpipe;
1091 int desiredsize, error;
1104 if (wpipe->pipe_present != PIPE_ACTIVE ||
1105 (wpipe->pipe_state & PIPE_EOF)) {
1111 error = mac_pipe_check_write(active_cred, wpipe->pipe_pair);
1121 desiredsize = max(SMALL_PIPE_SIZE, wpipe->pipe_buffer.size);
1122 while (desiredsize < wpipe->pipe_buffer.cnt + uio->uio_resid) {
1127 if (desiredsize == BIG_PIPE_SIZE)
1129 desiredsize = desiredsize * 2;
1134 wpipe->pipe_buffer.size > SMALL_PIPE_SIZE &&
1135 wpipe->pipe_buffer.cnt <= SMALL_PIPE_SIZE &&
1137 desiredsize = SMALL_PIPE_SIZE;
1140 if (desiredsize != wpipe->pipe_buffer.size &&
1141 (wpipe->pipe_state & PIPE_DIRECTW) == 0) {
1146 MPASS(wpipe->pipe_buffer.size != 0);
1148 orig_resid = uio->uio_resid;
1150 while (uio->uio_resid) {
1153 if (wpipe->pipe_state & PIPE_EOF) {
1157#ifndef PIPE_NODIRECT
1167 if (uio->uio_segflg == UIO_USERSPACE &&
1170 (fp->f_flag & FNONBLOCK) == 0) {
1185 if (wpipe->pipe_pages.cnt != 0) {
1186 if (wpipe->pipe_state & PIPE_WANTR) {
1187 wpipe->pipe_state &= ~PIPE_WANTR;
1191 wpipe->pipe_state |= PIPE_WANTW;
1193 error = msleep(wpipe, PIPE_MTX(rpipe), PRIBIO | PCATCH,
1201 space = wpipe->pipe_buffer.size - wpipe->pipe_buffer.cnt;
1204 if ((space < uio->uio_resid) && (orig_resid <= PIPE_BUF))
1215 if (space > uio->uio_resid)
1216 size = uio->uio_resid;
1226 segsize = wpipe->pipe_buffer.size -
1227 wpipe->pipe_buffer.in;
1234 error =
uiomove(&wpipe->pipe_buffer.buffer[wpipe->pipe_buffer.in],
1238 if (error == 0 && segsize < size) {
1239 KASSERT(wpipe->pipe_buffer.in + segsize ==
1240 wpipe->pipe_buffer.size,
1241 (
"Pipe buffer wraparound disappeared"));
1250 &wpipe->pipe_buffer.buffer[0],
1251 size - segsize, uio);
1255 wpipe->pipe_buffer.in += size;
1256 if (wpipe->pipe_buffer.in >=
1257 wpipe->pipe_buffer.size) {
1258 KASSERT(wpipe->pipe_buffer.in ==
1260 wpipe->pipe_buffer.size,
1261 (
"Expected wraparound bad"));
1262 wpipe->pipe_buffer.in = size - segsize;
1265 wpipe->pipe_buffer.cnt += size;
1266 KASSERT(wpipe->pipe_buffer.cnt <=
1267 wpipe->pipe_buffer.size,
1268 (
"Pipe buffer overflow"));
1277 if (wpipe->pipe_state & PIPE_WANTR) {
1278 wpipe->pipe_state &= ~PIPE_WANTR;
1285 if (fp->f_flag & FNONBLOCK) {
1296 wpipe->pipe_state |= PIPE_WANTW;
1298 error = msleep(wpipe, PIPE_MTX(rpipe),
1299 PRIBIO | PCATCH,
"pipewr", 0);
1309 if ((wpipe->pipe_busy == 0) && (wpipe->pipe_state & PIPE_WANT)) {
1310 wpipe->pipe_state &= ~(PIPE_WANT | PIPE_WANTR);
1312 }
else if (wpipe->pipe_buffer.cnt > 0) {
1317 if (wpipe->pipe_state & PIPE_WANTR) {
1318 wpipe->pipe_state &= ~PIPE_WANTR;
1329 if (uio->uio_resid != orig_resid && error == EPIPE)
1339 if (wpipe->pipe_buffer.cnt)
1344 if (uio->uio_resid != orig_resid)
1345 td->td_ru.ru_msgsnd++;
1358 if (cpipe->pipe_type & PIPE_TYPE_NAMED)
1359 error =
vnops.fo_truncate(fp, length, active_cred, td);
1372 struct pipe *mpipe = fp->f_data;
1378 error = mac_pipe_check_ioctl(active_cred, mpipe->pipe_pair, cmd,
data);
1392 mpipe->pipe_state |= PIPE_ASYNC;
1394 mpipe->pipe_state &= ~PIPE_ASYNC;
1399 if (!(fp->f_flag & FREAD)) {
1404 if (mpipe->pipe_pages.cnt != 0)
1405 *(
int *)
data = mpipe->pipe_pages.cnt;
1407 *(
int *)
data = mpipe->pipe_buffer.cnt;
1412 error =
fsetown(*(
int *)
data, &mpipe->pipe_sigio);
1422 error =
fsetown(-(*(
int *)
data), &mpipe->pipe_sigio);
1440pipe_poll(
struct file *fp,
int events,
struct ucred *active_cred,
1445 int levents, revents;
1455 error = mac_pipe_check_poll(active_cred, rpipe->pipe_pair);
1459 if (fp->f_flag & FREAD && events & (POLLIN | POLLRDNORM))
1460 if (rpipe->pipe_pages.cnt > 0 || rpipe->pipe_buffer.cnt > 0)
1461 revents |= events & (POLLIN | POLLRDNORM);
1463 if (fp->f_flag & FWRITE && events & (POLLOUT | POLLWRNORM))
1464 if (wpipe->pipe_present != PIPE_ACTIVE ||
1465 (wpipe->pipe_state & PIPE_EOF) ||
1466 ((wpipe->pipe_state & PIPE_DIRECTW) == 0 &&
1467 ((wpipe->pipe_buffer.size - wpipe->pipe_buffer.cnt) >= PIPE_BUF ||
1468 wpipe->pipe_buffer.size == 0)))
1469 revents |= events & (POLLOUT | POLLWRNORM);
1472 (POLLIN | POLLINIGNEOF | POLLPRI | POLLRDNORM | POLLRDBAND);
1473 if (rpipe->pipe_type & PIPE_TYPE_NAMED && fp->f_flag & FREAD && levents &&
1474 fp->f_pipegen == rpipe->pipe_wgen)
1475 events |= POLLINIGNEOF;
1477 if ((events & POLLINIGNEOF) == 0) {
1478 if (rpipe->pipe_state & PIPE_EOF) {
1479 if (fp->f_flag & FREAD)
1480 revents |= (events & (POLLIN | POLLRDNORM));
1481 if (wpipe->pipe_present != PIPE_ACTIVE ||
1482 (wpipe->pipe_state & PIPE_EOF))
1492 if ((fp->f_flag & FREAD) != 0) {
1494 if (SEL_WAITING(&rpipe->pipe_sel))
1495 rpipe->pipe_state |= PIPE_SEL;
1498 if ((fp->f_flag & FWRITE) != 0 &&
1499 wpipe->pipe_present == PIPE_ACTIVE) {
1501 if (SEL_WAITING(&wpipe->pipe_sel))
1502 wpipe->pipe_state |= PIPE_SEL;
1518pipe_stat(
struct file *fp,
struct stat *ub,
struct ucred *active_cred)
1527 if (mac_pipe_check_stat_enabled()) {
1529 error = mac_pipe_check_stat(active_cred, pipe->pipe_pair);
1538 if (pipe->pipe_type & PIPE_TYPE_NAMED) {
1539 return (
vnops.fo_stat(fp, ub, active_cred));
1542 bzero(ub,
sizeof(*ub));
1543 ub->st_mode = S_IFIFO;
1544 ub->st_blksize = PAGE_SIZE;
1545 if (pipe->pipe_pages.cnt != 0)
1546 ub->st_size = pipe->pipe_pages.cnt;
1548 ub->st_size = pipe->pipe_buffer.cnt;
1549 ub->st_blocks = howmany(ub->st_size, ub->st_blksize);
1550 ub->st_atim = pipe->pipe_atime;
1551 ub->st_mtim = pipe->pipe_mtime;
1552 ub->st_ctim = pipe->pipe_ctime;
1553 ub->st_uid = fp->f_cred->cr_uid;
1554 ub->st_gid = fp->f_cred->cr_gid;
1556 ub->st_ino = pipe->pipe_ino;
1568 if (fp->f_vnode != NULL)
1569 return vnops.fo_close(fp, td);
1577pipe_chmod(
struct file *fp, mode_t
mode,
struct ucred *active_cred,
struct thread *td)
1583 if (cpipe->pipe_type & PIPE_TYPE_NAMED)
1591pipe_chown(
struct file *fp, uid_t uid, gid_t gid,
struct ucred *active_cred,
1598 if (cpipe->pipe_type & PIPE_TYPE_NAMED)
1599 error =
vn_chown(fp, uid, gid, active_cred, td);
1601 error =
invfo_chown(fp, uid, gid, active_cred, td);
1610 if (fp->f_type == DTYPE_FIFO)
1612 kif->kf_type = KF_TYPE_PIPE;
1614 kif->kf_un.kf_pipe.kf_pipe_addr = (uintptr_t)pi;
1615 kif->kf_un.kf_pipe.kf_pipe_peer = (uintptr_t)pi->pipe_peer;
1616 kif->kf_un.kf_pipe.kf_pipe_buffer_cnt = pi->pipe_buffer.cnt;
1624 KASSERT(!mtx_owned(PIPE_MTX(cpipe)),
1625 (
"pipe_free_kmem: pipe mutex locked"));
1627 if (cpipe->pipe_buffer.buffer != NULL) {
1628 atomic_subtract_long(&
amountpipekva, cpipe->pipe_buffer.size);
1629 vm_map_remove(pipe_map,
1630 (vm_offset_t)cpipe->pipe_buffer.buffer,
1631 (vm_offset_t)cpipe->pipe_buffer.buffer + cpipe->pipe_buffer.size);
1632 cpipe->pipe_buffer.buffer = NULL;
1634#ifndef PIPE_NODIRECT
1636 cpipe->pipe_pages.cnt = 0;
1637 cpipe->pipe_pages.pos = 0;
1638 cpipe->pipe_pages.npages = 0;
1649 struct pipepair *pp;
1652 KASSERT(cpipe != NULL, (
"pipeclose: cpipe == NULL"));
1656 pp = cpipe->pipe_pair;
1662 cpipe->pipe_state |= PIPE_EOF;
1663 while (cpipe->pipe_busy) {
1665 cpipe->pipe_state |= PIPE_WANT;
1667 msleep(cpipe, PIPE_MTX(cpipe), PRIBIO,
"pipecl", 0);
1676 ppipe = cpipe->pipe_peer;
1677 if (ppipe->pipe_present == PIPE_ACTIVE) {
1678 ppipe->pipe_state |= PIPE_EOF;
1692 cpipe->pipe_present = PIPE_CLOSING;
1700 knlist_clear(&cpipe->pipe_sel.si_note, 1);
1701 cpipe->pipe_present = PIPE_FINALIZED;
1709 if (ppipe->pipe_present == PIPE_FINALIZED) {
1712 mac_pipe_destroy(pp);
1730 if ((kn->kn_filter == EVFILT_READ) && !(fp->f_flag & FREAD)) {
1734 if ((kn->kn_filter == EVFILT_WRITE) && !(fp->f_flag & FWRITE)) {
1740 switch (kn->kn_filter) {
1746 if (cpipe->pipe_peer->pipe_present != PIPE_ACTIVE) {
1754 if ((cpipe->pipe_type & PIPE_TYPE_NAMED) != 0) {
1756 return (
vnops.fo_kqfilter(fp, kn));
1762 kn->kn_hook = cpipe;
1771 struct pipe *cpipe = kn->kn_hook;
1782 struct file *fp = kn->kn_fp;
1783 struct pipe *rpipe = kn->kn_hook;
1785 PIPE_LOCK_ASSERT(rpipe, MA_OWNED);
1786 kn->kn_data = rpipe->pipe_buffer.cnt;
1787 if (kn->kn_data == 0)
1788 kn->kn_data = rpipe->pipe_pages.cnt;
1790 if ((rpipe->pipe_state & PIPE_EOF) != 0 &&
1791 ((rpipe->pipe_type & PIPE_TYPE_NAMED) == 0 ||
1792 fp->f_pipegen != rpipe->pipe_wgen)) {
1793 kn->kn_flags |= EV_EOF;
1796 kn->kn_flags &= ~EV_EOF;
1797 return (kn->kn_data > 0);
1804 struct pipe *wpipe = kn->kn_hook;
1810 if (wpipe->pipe_present == PIPE_ACTIVE ||
1811 (wpipe->pipe_type & PIPE_TYPE_NAMED) != 0) {
1812 PIPE_LOCK_ASSERT(wpipe, MA_OWNED);
1814 if (wpipe->pipe_state & PIPE_DIRECTW) {
1816 }
else if (wpipe->pipe_buffer.size > 0) {
1817 kn->kn_data = wpipe->pipe_buffer.size -
1818 wpipe->pipe_buffer.cnt;
1820 kn->kn_data = PIPE_BUF;
1824 if (wpipe->pipe_present != PIPE_ACTIVE ||
1825 (wpipe->pipe_state & PIPE_EOF)) {
1826 kn->kn_flags |= EV_EOF;
1829 kn->kn_flags &= ~EV_EOF;
1830 return (kn->kn_data >= PIPE_BUF);
int invfo_truncate(struct file *fp, off_t length, struct ucred *active_cred, struct thread *td)
int fsetown(pid_t pgid, struct sigio **sigiop)
int invfo_chown(struct file *fp, uid_t uid, gid_t gid, struct ucred *active_cred, struct thread *td)
void funsetown(struct sigio **sigiop)
pid_t fgetown(struct sigio **sigiop)
void fdclose(struct thread *td, struct file *fp, int idx)
int kern_close(struct thread *td, int fd)
struct fileops badfileops
void finit(struct file *fp, u_int flag, short type, void *data, struct fileops *ops)
int invfo_sendfile(struct file *fp, int sockfd, struct uio *hdr_uio, struct uio *trl_uio, off_t offset, size_t nbytes, off_t *sent, int flags, struct thread *td)
int falloc_caps(struct thread *td, struct file **resultfp, int *resultfd, int flags, struct filecaps *fcaps)
int invfo_chmod(struct file *fp, mode_t mode, struct ucred *active_cred, struct thread *td)
void knlist_remove(struct knlist *knl, struct knote *kn, int islocked)
void knlist_add(struct knlist *knl, struct knote *kn, int islocked)
void knlist_destroy(struct knlist *knl)
void knote(struct knlist *list, long hint, int lockflags)
void knlist_init_mtx(struct knlist *knl, struct mtx *lock)
void pgsigio(struct sigio **sigiop, int sig, int checkctty)
void wakeup(const void *ident)
void wakeup_one(const void *ident)
int sysctl_handle_long(SYSCTL_HANDLER_ARGS)
void getnanotime(struct timespec *tsp)
int ppsratecheck(struct timeval *lasttime, int *curpps, int maxpps)
int printf(const char *fmt,...)
int uiomove(void *cp, int n, struct uio *uio)
void selwakeuppri(struct selinfo *sip, int pri)
void seldrain(struct selinfo *sip)
void selrecord(struct thread *selector, struct selinfo *sip)
static void pipe_destroy_write_buffer(struct pipe *wpipe)
static int filt_piperead(struct knote *kn, long hint)
static void pipe_free_kmem(struct pipe *cpipe)
static void filt_pipedetach(struct knote *kn)
static fo_poll_t pipe_poll
static int pipespace_new(struct pipe *cpipe, int size)
static long pipe_mindirect
static void pipe_timestamp(struct timespec *tsp)
static int sysctl_handle_pipe_mindirect(SYSCTL_HANDLER_ARGS)
static int filt_pipenotsup(struct knote *kn, long hint)
static void pipe_zone_fini(void *mem, int size)
static int piperesizefail
SYSINIT(vfs, SI_SUB_VFS, SI_ORDER_ANY, pipeinit, NULL)
static uma_zone_t pipe_zone
static fo_rdwr_t pipe_read
static fo_close_t pipe_close
static int filt_pipewrite(struct knote *kn, long hint)
static int pipe_zone_init(void *mem, int size, int flags)
static fo_kqfilter_t pipe_kqfilter
static int pipespace(struct pipe *cpipe, int size)
void pipeselwakeup(struct pipe *cpipe)
static struct filterops pipe_wfiltops
SYSCTL_OID(_kern_ipc, OID_AUTO, pipe_mindirect, CTLTYPE_LONG|CTLFLAG_RW, &pipe_mindirect, 0, sysctl_handle_pipe_mindirect, "L", "Minimum write size triggering VM optimization")
static fo_truncate_t pipe_truncate
static void pipeinit(void *dummy __unused)
static fo_ioctl_t pipe_ioctl
int sys_pipe2(struct thread *td, struct pipe2_args *uap)
static int pipe_build_write_buffer(struct pipe *wpipe, struct uio *uio)
static void pipeclose(struct pipe *cpipe)
static fo_chown_t pipe_chown
static struct filterops pipe_nfiltops
static __inline void pipeunlock(struct pipe *cpipe)
static fo_rdwr_t pipe_write
static fo_stat_t pipe_stat
int kern_pipe(struct thread *td, int fildes[2], int flags, struct filecaps *fcaps1, struct filecaps *fcaps2)
void pipe_dtor(struct pipe *dpipe)
static fo_chmod_t pipe_chmod
static struct unrhdr64 pipeino_unr
int pipe_named_ctor(struct pipe **ppipe, struct thread *td)
static __inline int pipelock(struct pipe *cpipe, int catch)
static int piperesizeallowed
static struct filterops pipe_rfiltops
SYSCTL_LONG(_kern_ipc, OID_AUTO, maxpipekva, CTLFLAG_RDTUN|CTLFLAG_NOFETCH, &maxpipekva, 0, "Pipe KVA limit")
static int pipe_direct_write(struct pipe *wpipe, struct uio *uio)
static int pipe_create(struct pipe *pipe, bool backing)
static int pipe_zone_ctor(void *mem, int size, void *arg, int flags)
static void pipe_clone_write_buffer(struct pipe *wpipe)
SYSCTL_INT(_kern_ipc, OID_AUTO, pipefragretry, CTLFLAG_RD, &pipefragretry, 0, "Pipe allocation retries due to fragmentation")
static long amountpipekva
static fo_fill_kinfo_t pipe_fill_kinfo
static void filt_pipedetach_notsup(struct knote *kn)
static int pipe_paircreate(struct thread *td, struct pipepair **p_pp)
int vn_fill_kinfo(struct file *fp, struct kinfo_file *kif, struct filedesc *fdp)
int vn_chown(struct file *fp, uid_t uid, gid_t gid, struct ucred *active_cred, struct thread *td)
int vn_chmod(struct file *fp, mode_t mode, struct ucred *active_cred, struct thread *td)