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/* -*- 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/. */
/*
* This file implements _PR_MD_PR_POLL for OS/2.
*/
#include <sys/time.h> /* For timeval. */
#include "primpl.h"
#ifndef BSD_SELECT
/* Utility functions called when using OS/2 select */
PRBool IsSocketSet( PRInt32 osfd, int* socks, int start, int count )
{
int i;
PRBool isSet = PR_FALSE;
for( i = start; i < start+count; i++ )
{
if( socks[i] == osfd ) {
isSet = PR_TRUE;
}
}
return isSet;
}
#endif
PRInt32 _PR_MD_PR_POLL(PRPollDesc *pds, PRIntn npds, PRIntervalTime timeout)
{
#ifdef BSD_SELECT
fd_set rd, wt, ex;
#else
int rd, wt, ex;
int* socks;
unsigned long msecs;
int i, j;
#endif
PRFileDesc *bottom;
PRPollDesc *pd, *epd;
PRInt32 maxfd = -1, ready, err;
PRIntervalTime remaining, elapsed, start;
#ifdef BSD_SELECT
struct timeval tv, *tvp = NULL;
FD_ZERO(&rd);
FD_ZERO(&wt);
FD_ZERO(&ex);
#else
rd = 0;
wt = 0;
ex = 0;
socks = (int) PR_MALLOC( npds * 3 * sizeof(int) );
if (!socks)
{
PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
return -1;
}
#endif
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;
#ifdef BSD_SELECT
FD_SET(osfd, &rd);
#else
socks[rd] = osfd;
rd++;
#endif
}
if (in_flags_read & PR_POLL_WRITE)
{
pd->out_flags |= _PR_POLL_READ_SYS_WRITE;
#ifdef BSD_SELECT
FD_SET(osfd, &wt);
#else
socks[npds+wt] = osfd;
wt++;
#endif
}
if (in_flags_write & PR_POLL_READ)
{
pd->out_flags |= _PR_POLL_WRITE_SYS_READ;
#ifdef BSD_SELECT
FD_SET(osfd, &rd);
#else
socks[rd] = osfd;
rd++;
#endif
}
if (in_flags_write & PR_POLL_WRITE)
{
pd->out_flags |= _PR_POLL_WRITE_SYS_WRITE;
#ifdef BSD_SELECT
FD_SET(osfd, &wt);
#else
socks[npds+wt] = osfd;
wt++;
#endif
}
if (pd->in_flags & PR_POLL_EXCEPT)
{
#ifdef BSD_SELECT
FD_SET(osfd, &ex);
#else
socks[npds*2+ex] = osfd;
ex++;
#endif
}
}
}
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)
{
#ifndef BSD_SELECT
PR_Free(socks);
#endif
return ready; /* no need to block */
}
remaining = timeout;
start = PR_IntervalNow();
retry:
#ifdef BSD_SELECT
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 = bsdselect(maxfd + 1, &rd, &wt, &ex, tvp);
#else
switch (timeout)
{
case PR_INTERVAL_NO_WAIT:
msecs = 0;
break;
case PR_INTERVAL_NO_TIMEOUT:
msecs = -1;
break;
default:
msecs = PR_IntervalToMilliseconds(remaining);
}
/* compact array */
for( i = rd, j = npds; j < npds+wt; i++,j++ ) {
socks[i] = socks[j];
}
for( i = rd+wt, j = npds*2; j < npds*2+ex; i++,j++ ) {
socks[i] = socks[j];
}
ready = os2_select(socks, rd, wt, ex, msecs);
#endif
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;
#ifdef BSD_SELECT
if (FD_ISSET(osfd, &rd))
#else
if( IsSocketSet(osfd, socks, 0, rd) )
#endif
{
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;
}
}
#ifdef BSD_SELECT
if (FD_ISSET(osfd, &wt))
#else
if( IsSocketSet(osfd, socks, rd, wt) )
#endif
{
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;
}
}
#ifdef BSD_SELECT
if (FD_ISSET(osfd, &ex))
#else
if( IsSocketSet(osfd, socks, rd+wt, ex) )
#endif
{
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 */
int optval;
int optlen = sizeof(optval);
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 (getsockopt(bottom->secret->md.osfd, SOL_SOCKET,
SO_TYPE, (char *) &optval, &optlen) == -1)
{
PR_ASSERT(sock_errno() == ENOTSOCK);
if (sock_errno() == ENOTSOCK)
{
pd->out_flags = PR_POLL_NVAL;
ready++;
}
}
}
}
PR_ASSERT(ready > 0);
}
else {
_PR_MD_MAP_SELECT_ERROR(err);
}
}
#ifndef BSD_SELECT
PR_Free(socks);
#endif
return ready;
}
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