1 /*
2 +----------------------------------------------------------------------+
3 | PHP Version 7 |
4 +----------------------------------------------------------------------+
5 | Copyright (c) 1997-2018 The PHP Group |
6 +----------------------------------------------------------------------+
7 | This source file is subject to version 3.01 of the PHP license, |
8 | that is bundled with this package in the file LICENSE, and is |
9 | available through the world-wide-web at the following url: |
10 | http://www.php.net/license/3_01.txt |
11 | If you did not receive a copy of the PHP license and are unable to |
12 | obtain it through the world-wide-web, please send a note to |
13 | license@php.net so we can mail you a copy immediately. |
14 +----------------------------------------------------------------------+
15 | Author: Wez Furlong <wez@thebrainroom.com> |
16 +----------------------------------------------------------------------+
17 */
18
19 #include "php.h"
20 #include "php_network.h"
21
22 /* Win32 select() will only work with sockets, so we roll our own implementation here.
23 * - If you supply only sockets, this simply passes through to winsock select().
24 * - If you supply file handles, there is no way to distinguish between
25 * ready for read/write or OOB, so any set in which the handle is found will
26 * be marked as ready.
27 * - If you supply a mixture of handles and sockets, the system will interleave
28 * calls between select() and WaitForMultipleObjects(). The time slicing may
29 * cause this function call to take up to 100 ms longer than you specified.
30 * - Calling this with NULL sets as a portable way to sleep with sub-second
31 * accuracy is not supported.
32 * */
php_select(php_socket_t max_fd,fd_set * rfds,fd_set * wfds,fd_set * efds,struct timeval * tv)33 PHPAPI int php_select(php_socket_t max_fd, fd_set *rfds, fd_set *wfds, fd_set *efds, struct timeval *tv)
34 {
35 ULONGLONG ms_total, limit;
36 HANDLE handles[MAXIMUM_WAIT_OBJECTS];
37 int handle_slot_to_fd[MAXIMUM_WAIT_OBJECTS];
38 int n_handles = 0, i;
39 fd_set sock_read, sock_write, sock_except;
40 fd_set aread, awrite, aexcept;
41 int sock_max_fd = -1;
42 struct timeval tvslice;
43 int retcode;
44
45 /* As max_fd is unsigned, non socket might overflow. */
46 if (max_fd > (php_socket_t)INT_MAX) {
47 return -1;
48 }
49
50 #define SAFE_FD_ISSET(fd, set) (set != NULL && FD_ISSET(fd, set))
51
52 /* calculate how long we need to wait in milliseconds */
53 if (tv == NULL) {
54 ms_total = INFINITE;
55 } else {
56 ms_total = tv->tv_sec * 1000;
57 ms_total += tv->tv_usec / 1000;
58 }
59
60 FD_ZERO(&sock_read);
61 FD_ZERO(&sock_write);
62 FD_ZERO(&sock_except);
63
64 /* build an array of handles for non-sockets */
65 for (i = 0; (uint32_t)i < max_fd; i++) {
66 if (SAFE_FD_ISSET(i, rfds) || SAFE_FD_ISSET(i, wfds) || SAFE_FD_ISSET(i, efds)) {
67 handles[n_handles] = (HANDLE)(zend_uintptr_t)_get_osfhandle(i);
68 if (handles[n_handles] == INVALID_HANDLE_VALUE) {
69 /* socket */
70 if (SAFE_FD_ISSET(i, rfds)) {
71 FD_SET((uint32_t)i, &sock_read);
72 }
73 if (SAFE_FD_ISSET(i, wfds)) {
74 FD_SET((uint32_t)i, &sock_write);
75 }
76 if (SAFE_FD_ISSET(i, efds)) {
77 FD_SET((uint32_t)i, &sock_except);
78 }
79 if (i > sock_max_fd) {
80 sock_max_fd = i;
81 }
82 } else {
83 handle_slot_to_fd[n_handles] = i;
84 n_handles++;
85 }
86 }
87 }
88
89 if (n_handles == 0) {
90 /* plain sockets only - let winsock handle the whole thing */
91 return select(-1, rfds, wfds, efds, tv);
92 }
93
94 /* mixture of handles and sockets; lets multiplex between
95 * winsock and waiting on the handles */
96
97 FD_ZERO(&aread);
98 FD_ZERO(&awrite);
99 FD_ZERO(&aexcept);
100
101 limit = GetTickCount64() + ms_total;
102 do {
103 retcode = 0;
104
105 if (sock_max_fd >= 0) {
106 /* overwrite the zero'd sets here; the select call
107 * will clear those that are not active */
108 aread = sock_read;
109 awrite = sock_write;
110 aexcept = sock_except;
111
112 tvslice.tv_sec = 0;
113 tvslice.tv_usec = 100000;
114
115 retcode = select(-1, &aread, &awrite, &aexcept, &tvslice);
116 }
117 if (n_handles > 0) {
118 /* check handles */
119 DWORD wret;
120
121 wret = WaitForMultipleObjects(n_handles, handles, FALSE, retcode > 0 ? 0 : 100);
122
123 if (wret == WAIT_TIMEOUT) {
124 /* set retcode to 0; this is the default.
125 * select() may have set it to something else,
126 * in which case we leave it alone, so this branch
127 * does nothing */
128 ;
129 } else if (wret == WAIT_FAILED) {
130 if (retcode == 0) {
131 retcode = -1;
132 }
133 } else {
134 if (retcode < 0) {
135 retcode = 0;
136 }
137 for (i = 0; i < n_handles; i++) {
138 if (WAIT_OBJECT_0 == WaitForSingleObject(handles[i], 0)) {
139 if (SAFE_FD_ISSET(handle_slot_to_fd[i], rfds)) {
140 FD_SET((uint32_t)handle_slot_to_fd[i], &aread);
141 }
142 if (SAFE_FD_ISSET(handle_slot_to_fd[i], wfds)) {
143 FD_SET((uint32_t)handle_slot_to_fd[i], &awrite);
144 }
145 if (SAFE_FD_ISSET(handle_slot_to_fd[i], efds)) {
146 FD_SET((uint32_t)handle_slot_to_fd[i], &aexcept);
147 }
148 retcode++;
149 }
150 }
151 }
152 }
153 } while (retcode == 0 && (ms_total == INFINITE || GetTickCount64() < limit));
154
155 if (rfds) {
156 *rfds = aread;
157 }
158 if (wfds) {
159 *wfds = awrite;
160 }
161 if (efds) {
162 *efds = aexcept;
163 }
164
165 return retcode;
166 }
167
168 /*
169 * Local variables:
170 * tab-width: 4
171 * c-basic-offset: 4
172 * End:
173 * vim600: noet sw=4 ts=4 fdm=marker
174 * vim<600: noet sw=4 ts=4
175 */
176
