summaryrefslogtreecommitdiffstats
path: root/nsprpub/pr/src/md/unix/uxpoll.c
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--nsprpub/pr/src/md/unix/uxpoll.c722
1 files changed, 722 insertions, 0 deletions
diff --git a/nsprpub/pr/src/md/unix/uxpoll.c b/nsprpub/pr/src/md/unix/uxpoll.c
new file mode 100644
index 0000000000..d01121cbf1
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/uxpoll.c
@@ -0,0 +1,722 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#if defined(_PR_PTHREADS)
+
+#error "This file should not be compiled"
+
+#else /* defined(_PR_PTHREADS) */
+
+#include "primpl.h"
+
+#include <sys/time.h>
+
+#include <fcntl.h>
+#ifdef _PR_USE_POLL
+#include <poll.h>
+#endif
+
+#if defined(_PR_USE_POLL)
+static PRInt32 NativeThreadPoll(
+ PRPollDesc *pds, PRIntn npds, PRIntervalTime timeout)
+{
+ /*
+ * This function is mostly duplicated from ptio.s's PR_Poll().
+ */
+ PRInt32 ready = 0;
+ /*
+ * For restarting poll() if it is interrupted by a signal.
+ * We use these variables to figure out how much time has
+ * elapsed and how much of the timeout still remains.
+ */
+ PRIntn index, msecs;
+ struct pollfd *syspoll = NULL;
+ PRIntervalTime start, elapsed, remaining;
+
+ syspoll = (struct pollfd*)PR_MALLOC(npds * sizeof(struct pollfd));
+ if (NULL == syspoll)
+ {
+ PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
+ return -1;
+ }
+ for (index = 0; index < npds; ++index)
+ {
+ PRFileDesc *bottom;
+ PRInt16 in_flags_read = 0, in_flags_write = 0;
+ PRInt16 out_flags_read = 0, out_flags_write = 0;
+
+ if ((NULL != pds[index].fd) && (0 != pds[index].in_flags))
+ {
+ if (pds[index].in_flags & PR_POLL_READ)
+ {
+ in_flags_read = (pds[index].fd->methods->poll)(
+ pds[index].fd,
+ pds[index].in_flags & ~PR_POLL_WRITE,
+ &out_flags_read);
+ }
+ if (pds[index].in_flags & PR_POLL_WRITE)
+ {
+ in_flags_write = (pds[index].fd->methods->poll)(
+ pds[index].fd,
+ pds[index].in_flags & ~PR_POLL_READ,
+ &out_flags_write);
+ }
+ if ((0 != (in_flags_read & out_flags_read))
+ || (0 != (in_flags_write & out_flags_write)))
+ {
+ /* this one is ready right now */
+ if (0 == ready)
+ {
+ /*
+ * We will return without calling the system
+ * poll function. So zero the out_flags
+ * fields of all the poll descriptors before
+ * this one.
+ */
+ int i;
+ for (i = 0; i < index; i++)
+ {
+ pds[i].out_flags = 0;
+ }
+ }
+ ready += 1;
+ pds[index].out_flags = out_flags_read | out_flags_write;
+ }
+ else
+ {
+ pds[index].out_flags = 0; /* pre-condition */
+ /* now locate the NSPR layer at the bottom of the stack */
+ bottom = PR_GetIdentitiesLayer(pds[index].fd, PR_NSPR_IO_LAYER);
+ PR_ASSERT(NULL != bottom); /* what to do about that? */
+ if ((NULL != bottom)
+ && (_PR_FILEDESC_OPEN == bottom->secret->state))
+ {
+ if (0 == ready)
+ {
+ syspoll[index].fd = bottom->secret->md.osfd;
+ syspoll[index].events = 0; /* pre-condition */
+ if (in_flags_read & PR_POLL_READ)
+ {
+ pds[index].out_flags |=
+ _PR_POLL_READ_SYS_READ;
+ syspoll[index].events |= POLLIN;
+ }
+ if (in_flags_read & PR_POLL_WRITE)
+ {
+ pds[index].out_flags |=
+ _PR_POLL_READ_SYS_WRITE;
+ syspoll[index].events |= POLLOUT;
+ }
+ if (in_flags_write & PR_POLL_READ)
+ {
+ pds[index].out_flags |=
+ _PR_POLL_WRITE_SYS_READ;
+ syspoll[index].events |= POLLIN;
+ }
+ if (in_flags_write & PR_POLL_WRITE)
+ {
+ pds[index].out_flags |=
+ _PR_POLL_WRITE_SYS_WRITE;
+ syspoll[index].events |= POLLOUT;
+ }
+ if (pds[index].in_flags & PR_POLL_EXCEPT) {
+ syspoll[index].events |= POLLPRI;
+ }
+ }
+ }
+ else
+ {
+ if (0 == ready)
+ {
+ int i;
+ for (i = 0; i < index; i++)
+ {
+ pds[i].out_flags = 0;
+ }
+ }
+ ready += 1; /* this will cause an abrupt return */
+ pds[index].out_flags = PR_POLL_NVAL; /* bogii */
+ }
+ }
+ }
+ else
+ {
+ /* make poll() ignore this entry */
+ syspoll[index].fd = -1;
+ syspoll[index].events = 0;
+ pds[index].out_flags = 0;
+ }
+ }
+
+ if (0 == ready)
+ {
+ switch (timeout)
+ {
+ case PR_INTERVAL_NO_WAIT: msecs = 0; break;
+ case PR_INTERVAL_NO_TIMEOUT: msecs = -1; break;
+ default:
+ msecs = PR_IntervalToMilliseconds(timeout);
+ start = PR_IntervalNow();
+ }
+
+retry:
+ ready = _MD_POLL(syspoll, npds, msecs);
+ if (-1 == ready)
+ {
+ PRIntn oserror = errno;
+
+ if (EINTR == oserror)
+ {
+ if (timeout == PR_INTERVAL_NO_TIMEOUT) {
+ goto retry;
+ }
+ else if (timeout == PR_INTERVAL_NO_WAIT) {
+ ready = 0;
+ }
+ else
+ {
+ elapsed = (PRIntervalTime)(PR_IntervalNow() - start);
+ if (elapsed > timeout) {
+ ready = 0; /* timed out */
+ }
+ else
+ {
+ remaining = timeout - elapsed;
+ msecs = PR_IntervalToMilliseconds(remaining);
+ goto retry;
+ }
+ }
+ }
+ else {
+ _PR_MD_MAP_POLL_ERROR(oserror);
+ }
+ }
+ else if (ready > 0)
+ {
+ for (index = 0; index < npds; ++index)
+ {
+ PRInt16 out_flags = 0;
+ if ((NULL != pds[index].fd) && (0 != pds[index].in_flags))
+ {
+ if (0 != syspoll[index].revents)
+ {
+ /*
+ ** Set up the out_flags so that it contains the
+ ** bits that the highest layer thinks are nice
+ ** to have. Then the client of that layer will
+ ** call the appropriate I/O function and maybe
+ ** the protocol will make progress.
+ */
+ if (syspoll[index].revents & POLLIN)
+ {
+ if (pds[index].out_flags
+ & _PR_POLL_READ_SYS_READ)
+ {
+ out_flags |= PR_POLL_READ;
+ }
+ if (pds[index].out_flags
+ & _PR_POLL_WRITE_SYS_READ)
+ {
+ out_flags |= PR_POLL_WRITE;
+ }
+ }
+ if (syspoll[index].revents & POLLOUT)
+ {
+ if (pds[index].out_flags
+ & _PR_POLL_READ_SYS_WRITE)
+ {
+ out_flags |= PR_POLL_READ;
+ }
+ if (pds[index].out_flags
+ & _PR_POLL_WRITE_SYS_WRITE)
+ {
+ out_flags |= PR_POLL_WRITE;
+ }
+ }
+ if (syspoll[index].revents & POLLPRI) {
+ out_flags |= PR_POLL_EXCEPT;
+ }
+ if (syspoll[index].revents & POLLERR) {
+ out_flags |= PR_POLL_ERR;
+ }
+ if (syspoll[index].revents & POLLNVAL) {
+ out_flags |= PR_POLL_NVAL;
+ }
+ if (syspoll[index].revents & POLLHUP) {
+ out_flags |= PR_POLL_HUP;
+ }
+ }
+ }
+ pds[index].out_flags = out_flags;
+ }
+ }
+ }
+
+ PR_DELETE(syspoll);
+ return ready;
+
+} /* NativeThreadPoll */
+#endif /* defined(_PR_USE_POLL) */
+
+#if !defined(_PR_USE_POLL)
+static PRInt32 NativeThreadSelect(
+ PRPollDesc *pds, PRIntn npds, PRIntervalTime timeout)
+{
+ /*
+ * This code is almost a duplicate of w32poll.c's _PR_MD_PR_POLL().
+ */
+ fd_set rd, wt, ex;
+ PRFileDesc *bottom;
+ PRPollDesc *pd, *epd;
+ PRInt32 maxfd = -1, ready, err;
+ PRIntervalTime remaining, elapsed, start;
+
+ struct timeval tv, *tvp = NULL;
+
+ FD_ZERO(&rd);
+ FD_ZERO(&wt);
+ FD_ZERO(&ex);
+
+ ready = 0;
+ for (pd = pds, epd = pd + npds; pd < epd; pd++)
+ {
+ PRInt16 in_flags_read = 0, in_flags_write = 0;
+ PRInt16 out_flags_read = 0, out_flags_write = 0;
+
+ if ((NULL != pd->fd) && (0 != pd->in_flags))
+ {
+ if (pd->in_flags & PR_POLL_READ)
+ {
+ in_flags_read = (pd->fd->methods->poll)(
+ pd->fd, pd->in_flags & ~PR_POLL_WRITE, &out_flags_read);
+ }
+ if (pd->in_flags & PR_POLL_WRITE)
+ {
+ in_flags_write = (pd->fd->methods->poll)(
+ pd->fd, pd->in_flags & ~PR_POLL_READ, &out_flags_write);
+ }
+ if ((0 != (in_flags_read & out_flags_read))
+ || (0 != (in_flags_write & out_flags_write)))
+ {
+ /* this one's ready right now */
+ if (0 == ready)
+ {
+ /*
+ * We will have to return without calling the
+ * system poll/select function. So zero the
+ * out_flags fields of all the poll descriptors
+ * before this one.
+ */
+ PRPollDesc *prev;
+ for (prev = pds; prev < pd; prev++)
+ {
+ prev->out_flags = 0;
+ }
+ }
+ ready += 1;
+ pd->out_flags = out_flags_read | out_flags_write;
+ }
+ else
+ {
+ pd->out_flags = 0; /* pre-condition */
+
+ /* make sure this is an NSPR supported stack */
+ bottom = PR_GetIdentitiesLayer(pd->fd, PR_NSPR_IO_LAYER);
+ PR_ASSERT(NULL != bottom); /* what to do about that? */
+ if ((NULL != bottom)
+ && (_PR_FILEDESC_OPEN == bottom->secret->state))
+ {
+ if (0 == ready)
+ {
+ PRInt32 osfd = bottom->secret->md.osfd;
+ if (osfd > maxfd) {
+ maxfd = osfd;
+ }
+ if (in_flags_read & PR_POLL_READ)
+ {
+ pd->out_flags |= _PR_POLL_READ_SYS_READ;
+ FD_SET(osfd, &rd);
+ }
+ if (in_flags_read & PR_POLL_WRITE)
+ {
+ pd->out_flags |= _PR_POLL_READ_SYS_WRITE;
+ FD_SET(osfd, &wt);
+ }
+ if (in_flags_write & PR_POLL_READ)
+ {
+ pd->out_flags |= _PR_POLL_WRITE_SYS_READ;
+ FD_SET(osfd, &rd);
+ }
+ if (in_flags_write & PR_POLL_WRITE)
+ {
+ pd->out_flags |= _PR_POLL_WRITE_SYS_WRITE;
+ FD_SET(osfd, &wt);
+ }
+ if (pd->in_flags & PR_POLL_EXCEPT) {
+ FD_SET(osfd, &ex);
+ }
+ }
+ }
+ else
+ {
+ if (0 == ready)
+ {
+ PRPollDesc *prev;
+ for (prev = pds; prev < pd; prev++)
+ {
+ prev->out_flags = 0;
+ }
+ }
+ ready += 1; /* this will cause an abrupt return */
+ pd->out_flags = PR_POLL_NVAL; /* bogii */
+ }
+ }
+ }
+ else
+ {
+ pd->out_flags = 0;
+ }
+ }
+
+ if (0 != ready) {
+ return ready; /* no need to block */
+ }
+
+ remaining = timeout;
+ start = PR_IntervalNow();
+
+retry:
+ if (timeout != PR_INTERVAL_NO_TIMEOUT)
+ {
+ PRInt32 ticksPerSecond = PR_TicksPerSecond();
+ tv.tv_sec = remaining / ticksPerSecond;
+ tv.tv_usec = PR_IntervalToMicroseconds( remaining % ticksPerSecond );
+ tvp = &tv;
+ }
+
+ ready = _MD_SELECT(maxfd + 1, &rd, &wt, &ex, tvp);
+
+ if (ready == -1 && errno == EINTR)
+ {
+ if (timeout == PR_INTERVAL_NO_TIMEOUT) {
+ goto retry;
+ }
+ else
+ {
+ elapsed = (PRIntervalTime) (PR_IntervalNow() - start);
+ if (elapsed > timeout) {
+ ready = 0; /* timed out */
+ }
+ else
+ {
+ remaining = timeout - elapsed;
+ goto retry;
+ }
+ }
+ }
+
+ /*
+ ** Now to unravel the select sets back into the client's poll
+ ** descriptor list. Is this possibly an area for pissing away
+ ** a few cycles or what?
+ */
+ if (ready > 0)
+ {
+ ready = 0;
+ for (pd = pds, epd = pd + npds; pd < epd; pd++)
+ {
+ PRInt16 out_flags = 0;
+ if ((NULL != pd->fd) && (0 != pd->in_flags))
+ {
+ PRInt32 osfd;
+ bottom = PR_GetIdentitiesLayer(pd->fd, PR_NSPR_IO_LAYER);
+ PR_ASSERT(NULL != bottom);
+
+ osfd = bottom->secret->md.osfd;
+
+ if (FD_ISSET(osfd, &rd))
+ {
+ if (pd->out_flags & _PR_POLL_READ_SYS_READ) {
+ out_flags |= PR_POLL_READ;
+ }
+ if (pd->out_flags & _PR_POLL_WRITE_SYS_READ) {
+ out_flags |= PR_POLL_WRITE;
+ }
+ }
+ if (FD_ISSET(osfd, &wt))
+ {
+ if (pd->out_flags & _PR_POLL_READ_SYS_WRITE) {
+ out_flags |= PR_POLL_READ;
+ }
+ if (pd->out_flags & _PR_POLL_WRITE_SYS_WRITE) {
+ out_flags |= PR_POLL_WRITE;
+ }
+ }
+ if (FD_ISSET(osfd, &ex)) {
+ out_flags |= PR_POLL_EXCEPT;
+ }
+ }
+ pd->out_flags = out_flags;
+ if (out_flags) {
+ ready++;
+ }
+ }
+ PR_ASSERT(ready > 0);
+ }
+ else if (ready < 0)
+ {
+ err = _MD_ERRNO();
+ if (err == EBADF)
+ {
+ /* Find the bad fds */
+ ready = 0;
+ for (pd = pds, epd = pd + npds; pd < epd; pd++)
+ {
+ pd->out_flags = 0;
+ if ((NULL != pd->fd) && (0 != pd->in_flags))
+ {
+ bottom = PR_GetIdentitiesLayer(pd->fd, PR_NSPR_IO_LAYER);
+ if (fcntl(bottom->secret->md.osfd, F_GETFL, 0) == -1)
+ {
+ pd->out_flags = PR_POLL_NVAL;
+ ready++;
+ }
+ }
+ }
+ PR_ASSERT(ready > 0);
+ }
+ else {
+ _PR_MD_MAP_SELECT_ERROR(err);
+ }
+ }
+
+ return ready;
+} /* NativeThreadSelect */
+#endif /* !defined(_PR_USE_POLL) */
+
+static PRInt32 LocalThreads(
+ PRPollDesc *pds, PRIntn npds, PRIntervalTime timeout)
+{
+ PRPollDesc *pd, *epd;
+ PRInt32 ready, pdcnt;
+ _PRUnixPollDesc *unixpds, *unixpd;
+
+ /*
+ * XXX
+ * PRPollDesc has a PRFileDesc field, fd, while the IOQ
+ * is a list of PRPollQueue structures, each of which contains
+ * a _PRUnixPollDesc. A _PRUnixPollDesc struct contains
+ * the OS file descriptor, osfd, and not a PRFileDesc.
+ * So, we have allocate memory for _PRUnixPollDesc structures,
+ * copy the flags information from the pds list and have pq
+ * point to this list of _PRUnixPollDesc structures.
+ *
+ * It would be better if the memory allocation can be avoided.
+ */
+
+ unixpd = unixpds = (_PRUnixPollDesc*)
+ PR_MALLOC(npds * sizeof(_PRUnixPollDesc));
+ if (NULL == unixpds)
+ {
+ PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
+ return -1;
+ }
+
+ ready = 0;
+ for (pdcnt = 0, pd = pds, epd = pd + npds; pd < epd; pd++)
+ {
+ PRFileDesc *bottom;
+ PRInt16 in_flags_read = 0, in_flags_write = 0;
+ PRInt16 out_flags_read = 0, out_flags_write = 0;
+
+ if ((NULL != pd->fd) && (0 != pd->in_flags))
+ {
+ if (pd->in_flags & PR_POLL_READ)
+ {
+ in_flags_read = (pd->fd->methods->poll)(
+ pd->fd, pd->in_flags & ~PR_POLL_WRITE, &out_flags_read);
+ }
+ if (pd->in_flags & PR_POLL_WRITE)
+ {
+ in_flags_write = (pd->fd->methods->poll)(
+ pd->fd, pd->in_flags & ~PR_POLL_READ, &out_flags_write);
+ }
+ if ((0 != (in_flags_read & out_flags_read))
+ || (0 != (in_flags_write & out_flags_write)))
+ {
+ /* this one's ready right now */
+ if (0 == ready)
+ {
+ /*
+ * We will have to return without calling the
+ * system poll/select function. So zero the
+ * out_flags fields of all the poll descriptors
+ * before this one.
+ */
+ PRPollDesc *prev;
+ for (prev = pds; prev < pd; prev++)
+ {
+ prev->out_flags = 0;
+ }
+ }
+ ready += 1;
+ pd->out_flags = out_flags_read | out_flags_write;
+ }
+ else
+ {
+ pd->out_flags = 0; /* pre-condition */
+ bottom = PR_GetIdentitiesLayer(pd->fd, PR_NSPR_IO_LAYER);
+ PR_ASSERT(NULL != bottom); /* what to do about that? */
+ if ((NULL != bottom)
+ && (_PR_FILEDESC_OPEN == bottom->secret->state))
+ {
+ if (0 == ready)
+ {
+ unixpd->osfd = bottom->secret->md.osfd;
+ unixpd->in_flags = 0;
+ if (in_flags_read & PR_POLL_READ)
+ {
+ unixpd->in_flags |= _PR_UNIX_POLL_READ;
+ pd->out_flags |= _PR_POLL_READ_SYS_READ;
+ }
+ if (in_flags_read & PR_POLL_WRITE)
+ {
+ unixpd->in_flags |= _PR_UNIX_POLL_WRITE;
+ pd->out_flags |= _PR_POLL_READ_SYS_WRITE;
+ }
+ if (in_flags_write & PR_POLL_READ)
+ {
+ unixpd->in_flags |= _PR_UNIX_POLL_READ;
+ pd->out_flags |= _PR_POLL_WRITE_SYS_READ;
+ }
+ if (in_flags_write & PR_POLL_WRITE)
+ {
+ unixpd->in_flags |= _PR_UNIX_POLL_WRITE;
+ pd->out_flags |= _PR_POLL_WRITE_SYS_WRITE;
+ }
+ if ((in_flags_read | in_flags_write) & PR_POLL_EXCEPT)
+ {
+ unixpd->in_flags |= _PR_UNIX_POLL_EXCEPT;
+ }
+ unixpd++; pdcnt++;
+ }
+ }
+ else
+ {
+ if (0 == ready)
+ {
+ PRPollDesc *prev;
+ for (prev = pds; prev < pd; prev++)
+ {
+ prev->out_flags = 0;
+ }
+ }
+ ready += 1; /* this will cause an abrupt return */
+ pd->out_flags = PR_POLL_NVAL; /* bogii */
+ }
+ }
+ }
+ }
+
+ if (0 != ready)
+ {
+ /* no need to block */
+ PR_DELETE(unixpds);
+ return ready;
+ }
+
+ ready = _PR_WaitForMultipleFDs(unixpds, pdcnt, timeout);
+
+ /*
+ * Copy the out_flags from the _PRUnixPollDesc structures to the
+ * user's PRPollDesc structures and free the allocated memory
+ */
+ unixpd = unixpds;
+ for (pd = pds, epd = pd + npds; pd < epd; pd++)
+ {
+ PRInt16 out_flags = 0;
+ if ((NULL != pd->fd) && (0 != pd->in_flags))
+ {
+ /*
+ * take errors from the poll operation,
+ * the R/W bits from the request
+ */
+ if (0 != unixpd->out_flags)
+ {
+ if (unixpd->out_flags & _PR_UNIX_POLL_READ)
+ {
+ if (pd->out_flags & _PR_POLL_READ_SYS_READ) {
+ out_flags |= PR_POLL_READ;
+ }
+ if (pd->out_flags & _PR_POLL_WRITE_SYS_READ) {
+ out_flags |= PR_POLL_WRITE;
+ }
+ }
+ if (unixpd->out_flags & _PR_UNIX_POLL_WRITE)
+ {
+ if (pd->out_flags & _PR_POLL_READ_SYS_WRITE) {
+ out_flags |= PR_POLL_READ;
+ }
+ if (pd->out_flags & _PR_POLL_WRITE_SYS_WRITE) {
+ out_flags |= PR_POLL_WRITE;
+ }
+ }
+ if (unixpd->out_flags & _PR_UNIX_POLL_EXCEPT) {
+ out_flags |= PR_POLL_EXCEPT;
+ }
+ if (unixpd->out_flags & _PR_UNIX_POLL_ERR) {
+ out_flags |= PR_POLL_ERR;
+ }
+ if (unixpd->out_flags & _PR_UNIX_POLL_NVAL) {
+ out_flags |= PR_POLL_NVAL;
+ }
+ if (unixpd->out_flags & _PR_UNIX_POLL_HUP) {
+ out_flags |= PR_POLL_HUP;
+ }
+ }
+ unixpd++;
+ }
+ pd->out_flags = out_flags;
+ }
+
+ PR_DELETE(unixpds);
+
+ return ready;
+} /* LocalThreads */
+
+#if defined(_PR_USE_POLL)
+#define NativeThreads NativeThreadPoll
+#else
+#define NativeThreads NativeThreadSelect
+#endif
+
+PRInt32 _MD_pr_poll(PRPollDesc *pds, PRIntn npds, PRIntervalTime timeout)
+{
+ PRInt32 rv = 0;
+ PRThread *me = _PR_MD_CURRENT_THREAD();
+
+ if (_PR_PENDING_INTERRUPT(me))
+ {
+ me->flags &= ~_PR_INTERRUPT;
+ PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
+ return -1;
+ }
+ if (0 == npds) {
+ PR_Sleep(timeout);
+ }
+ else if (_PR_IS_NATIVE_THREAD(me)) {
+ rv = NativeThreads(pds, npds, timeout);
+ }
+ else {
+ rv = LocalThreads(pds, npds, timeout);
+ }
+
+ return rv;
+} /* _MD_pr_poll */
+
+#endif /* defined(_PR_PTHREADS) */
+
+/* uxpoll.c */
+