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dis-bench / src /php /php-src /win32 /select.c
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/*
+----------------------------------------------------------------------+
| Copyright (c) The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| https://www.php.net/license/3_01.txt |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Author: Wez Furlong <wez@thebrainroom.com> |
+----------------------------------------------------------------------+
*/
#include "php.h"
#include "php_network.h"
#include "win32/time.h"
/* Win32 select() will only work with sockets, so we roll our own implementation here.
* - If you supply only sockets, this simply passes through to winsock select().
* - If you supply file handles, there is no way to distinguish between
* ready for read/write or OOB, so any set in which the handle is found will
* be marked as ready.
* - If you supply only pipe handles in rfds, and no handles in wfds or efds,
* the pipes will only be marked as ready if there is data available.
* - If you supply a mixture of handles and sockets, the system will interleave
* calls between select() and WaitForMultipleObjects(). The time slicing may
* cause this function call to take up to 100 ms longer than you specified.
* - Calling this with NULL sets as a portable way to sleep with sub-second
* accuracy is not supported.
* */
PHPAPI int php_select(php_socket_t max_fd, fd_set *rfds, fd_set *wfds, fd_set *efds, struct timeval *tv)
{
ULONGLONG ms_total, limit;
HANDLE handles[MAXIMUM_WAIT_OBJECTS];
int handle_slot_to_fd[MAXIMUM_WAIT_OBJECTS];
int n_handles = 0, i;
int num_read_pipes = 0;
fd_set sock_read, sock_write, sock_except;
fd_set aread, awrite, aexcept;
int sock_max_fd = -1;
struct timeval tvslice;
int retcode;
/* As max_fd is unsigned, non socket might overflow. */
if (max_fd > (php_socket_t)INT_MAX) {
return -1;
}
#define SAFE_FD_ISSET(fd, set) (set != NULL && FD_ISSET(fd, set))
/* calculate how long we need to wait in milliseconds */
if (tv == NULL) {
ms_total = INFINITE;
} else {
ms_total = tv->tv_sec * 1000;
ms_total += tv->tv_usec / 1000;
}
FD_ZERO(&sock_read);
FD_ZERO(&sock_write);
FD_ZERO(&sock_except);
/* build an array of handles for non-sockets */
for (i = 0; (uint32_t)i < max_fd; i++) {
if (SAFE_FD_ISSET(i, rfds) || SAFE_FD_ISSET(i, wfds) || SAFE_FD_ISSET(i, efds)) {
handles[n_handles] = (HANDLE)(uintptr_t)_get_osfhandle(i);
if (handles[n_handles] == INVALID_HANDLE_VALUE) {
/* socket */
if (SAFE_FD_ISSET(i, rfds)) {
FD_SET((uint32_t)i, &sock_read);
}
if (SAFE_FD_ISSET(i, wfds)) {
FD_SET((uint32_t)i, &sock_write);
}
if (SAFE_FD_ISSET(i, efds)) {
FD_SET((uint32_t)i, &sock_except);
}
if (i > sock_max_fd) {
sock_max_fd = i;
}
} else {
if (SAFE_FD_ISSET(i, rfds) && GetFileType(handles[n_handles]) == FILE_TYPE_PIPE) {
num_read_pipes++;
}
handle_slot_to_fd[n_handles] = i;
n_handles++;
}
}
}
if (n_handles == 0) {
/* plain sockets only - let winsock handle the whole thing */
return select(-1, rfds, wfds, efds, tv);
}
/* mixture of handles and sockets; lets multiplex between
* winsock and waiting on the handles */
FD_ZERO(&aread);
FD_ZERO(&awrite);
FD_ZERO(&aexcept);
limit = GetTickCount64() + ms_total;
do {
retcode = 0;
if (sock_max_fd >= 0) {
/* overwrite the zero'd sets here; the select call
* will clear those that are not active */
aread = sock_read;
awrite = sock_write;
aexcept = sock_except;
tvslice.tv_sec = 0;
tvslice.tv_usec = 100000;
retcode = select(-1, &aread, &awrite, &aexcept, &tvslice);
}
if (n_handles > 0) {
/* check handles */
DWORD wret;
wret = WaitForMultipleObjects(n_handles, handles, FALSE, retcode > 0 ? 0 : 100);
if (wret == WAIT_TIMEOUT) {
/* set retcode to 0; this is the default.
* select() may have set it to something else,
* in which case we leave it alone, so this branch
* does nothing */
;
} else if (wret == WAIT_FAILED) {
if (retcode == 0) {
retcode = -1;
}
} else {
if (retcode < 0) {
retcode = 0;
}
for (i = 0; i < n_handles; i++) {
if (WAIT_OBJECT_0 == WaitForSingleObject(handles[i], 0)) {
if (SAFE_FD_ISSET(handle_slot_to_fd[i], rfds)) {
DWORD avail_read = 0;
if (num_read_pipes < n_handles
|| !PeekNamedPipe(handles[i], NULL, 0, NULL, &avail_read, NULL)
|| avail_read > 0
) {
FD_SET((uint32_t)handle_slot_to_fd[i], &aread);
retcode++;
}
}
if (SAFE_FD_ISSET(handle_slot_to_fd[i], wfds)) {
FD_SET((uint32_t)handle_slot_to_fd[i], &awrite);
retcode++;
}
if (SAFE_FD_ISSET(handle_slot_to_fd[i], efds)) {
FD_SET((uint32_t)handle_slot_to_fd[i], &aexcept);
retcode++;
}
}
}
}
}
if (retcode == 0 && num_read_pipes == n_handles && sock_max_fd < 0) {
usleep(100);
}
} while (retcode == 0 && (ms_total == INFINITE || GetTickCount64() < limit));
if (rfds) {
*rfds = aread;
}
if (wfds) {
*wfds = awrite;
}
if (efds) {
*efds = aexcept;
}
return retcode;
}