2 * Empire - A multi-player, client/server Internet based war game.
3 * Copyright (C) 1986-2007, Dave Pare, Jeff Bailey, Thomas Ruschak,
4 * Ken Stevens, Steve McClure
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 * See files README, COPYING and CREDITS in the root of the source
23 * tree for related information and legal notices. It is expected
24 * that future projects/authors will amend these files as needed.
28 * posixio.c: POSIX IO emulation layer for WIN32
30 * Known contributors to this file:
31 * Ron Koenderink, 2007
35 * POSIX has just one kind of file descriptors, while Windows has (at
36 * least) two: one for sockets and one for files, with separate
37 * functions to operate on them. To present a more POSIX-like
38 * interface to our application code, we provide a compatibility layer
39 * that maps POSIX file descriptors to sockets and file handles behind
40 * the scenes. This actual mapping is done by the fdmap. It doesn't
41 * implement the finer points of POSIX correctly. In particular, the
42 * actual values of the file descriptors usually differ.
58 #include "prototypes.h"
61 * FD_SETSIZE is the size for the maximum number of sockets.
62 * The number of file descriptors is in a variable _nhandle
63 * based on the assertion output. In order the simplify the
64 * code and skip dynamic allocation, used double the socket size.
66 #define MAX_FDS (FD_SETSIZE * 2)
72 FDMAP_IO_ANY /* used for searching only (lookup_handle) */
77 enum fdmap_io_type type;
80 static struct fdmap fdmap[MAX_FDS] = {
88 * Allocate a POSIX equivalent file descriptor.
89 * Note once get_fd() is called either free_fd() or set_fd()
90 * must be called before thread mutex is released as the
91 * allocation/deallocation code is not thread safe.
98 for (fd = 0; fd < nfd && fdmap[fd].type != FDMAP_IO_NOTUSED; fd++) ;
104 fdmap[fd].type = FDMAP_IO_NOTUSED;
111 * Deallocate a POSIX equivalent file descriptor.
116 fdmap[fd].type = FDMAP_IO_NOTUSED;
117 for(; fdmap[nfd - 1].type == FDMAP_IO_NOTUSED; nfd--) ;
121 * Complete the allocation of the file descriptor.
124 set_fd(int fd, enum fdmap_io_type type, int handle)
128 fdmap[fd].handle = handle;
129 fdmap[fd].type = type;
132 * Garbage collection for posix_fileno(), currently not
133 * replacing fclose() and fcloseall() so do not know when
134 * a stream is closed.
136 for (i = 0; i < nfd; i++) {
137 if (i != fd && type == fdmap[i].type && handle == fdmap[i].handle)
143 * Find the windows handle (file or socket) for file descriptor.
144 * Return windows handle and type of handle.
145 * You can search for a specific type (FDMAP_IO_FILE or FDMAP_IO_SOCKET)
146 * or for both search by using FDMAP_IO_ANY.
147 * FDMAP_IO_NOTUSED is not valid type to search with.
150 lookup_handle(int fd, enum fdmap_io_type d_type, int error,
151 enum fdmap_io_type *type_ptr, int *handle_ptr)
154 if (fd < 0 || fd >= MAX_FDS) {
158 } else if ((fdmap[fd].type != d_type && d_type != FDMAP_IO_ANY) ||
159 (fdmap[fd].type == FDMAP_IO_NOTUSED && d_type == FDMAP_IO_ANY)) {
164 if (type_ptr != NULL)
165 *type_ptr = fdmap[fd].type;
166 if (handle_ptr != NULL)
167 *handle_ptr = fdmap[fd].handle;
172 * Find and return the file descriptor associated with windows handle.
173 * You can search for FDMAP_IO_FILE or FDMAP_IO_SOCKET.
174 * FDMAP_IO_ANY or FDMAP_IO_NOTUSED is not considered valid search
178 lookup_fd(int handle, enum fdmap_io_type d_type)
182 for (i = 0; i < nfd; i++)
183 if (fdmap[i].handle == handle && fdmap[i].type == d_type)
189 * Get the window socket handle for POSIX file descriptor.
192 posix_fd2socket(int fd)
195 enum fdmap_io_type type;
197 if (!lookup_handle(fd, FDMAP_IO_SOCKET, WSAENOTSOCK,
199 return INVALID_SOCKET;
203 #define SOCKET_FUNCTION(expr) \
207 if (!lookup_handle(fd, FDMAP_IO_SOCKET, \
208 ENOTSOCK, NULL, &handle)) \
212 if (result == SOCKET_ERROR) { \
213 errno = WSAGetLastError(); \
219 * POSIX equivalent for accept().
223 posix_accept(int fd, struct sockaddr *addr, socklen_t *addrlen)
226 int handle, new_handle;
228 if (!lookup_handle(fd, FDMAP_IO_SOCKET, ENOTSOCK, NULL, &handle))
235 new_handle = accept(handle, addr, addrlen);
236 if (new_handle == INVALID_SOCKET) {
238 errno = WSAGetLastError();
241 set_fd(new_fd, FDMAP_IO_SOCKET, new_handle);
246 * POSIX equivalent for bind().
250 posix_bind(int fd, const struct sockaddr *name, int namelen)
252 SOCKET_FUNCTION(bind(handle, name, namelen))
256 * POSIX equivalent for listen().
260 posix_listen(int fd, int backlog)
262 SOCKET_FUNCTION(listen(handle, backlog))
266 * POSIX equivalent for setsockopt().
270 posix_setsockopt(int fd, int level, int optname,
271 const void *optval, int optlen)
274 * SO_REUSEADDR requests from tcp_listen.c
275 * to permit another bind even when the
276 * port is still in state TIME_WAIT. Windows' SO_REUSEADDR is
277 * broken: it makes bind() succeed no matter what, even if
278 * there's another server running on the same port. Luckily,
279 * bind() seems to be broken as well: it seems to succeed while
280 * the port is in state TIME_WAIT by default; thus we get the
281 * behavior we want by not setting SO_REUSEADDR.
283 if (level == SOL_SOCKET && optname == SO_REUSEADDR)
286 SOCKET_FUNCTION(setsockopt(handle, level, optname,
292 * POSIX equivalent for shutdown().
296 posix_shutdown(int fd, int how)
298 SOCKET_FUNCTION(shutdown(handle, how))
302 * POSIX equivalent for socket().
306 posix_socket(int domain, int type, int protocol)
311 if ((new_fd = get_fd()) < 0)
314 handle = socket(domain, type, protocol);
315 if (handle == INVALID_SOCKET) {
317 errno = WSAGetLastError();
320 set_fd(new_fd, FDMAP_IO_SOCKET, handle);
324 #define FILE_FUNCTION(type, expr) \
327 if (!lookup_handle(fd, (type), EBADF, NULL, &handle)) \
333 * POSIX equivalent for close().
340 enum fdmap_io_type type;
342 if (!lookup_handle(fd, FDMAP_IO_ANY, EBADF, &type, &handle))
347 case FDMAP_IO_SOCKET:
348 result = closesocket(handle);
349 if (result == SOCKET_ERROR) {
350 errno = WSAGetLastError();
355 return _close(handle);
362 * posix_fsync forces file sync with the disk.
363 * In order for the power report report to accurate timestamp,
364 * the _commit() is to force a sync with disk and therefore
365 * an update for file time.
370 FILE_FUNCTION(FDMAP_IO_FILE, _commit(handle))
374 * POSIX equivalent for fstat().
375 * fstat() is used instead of _fstat(),
376 * otherwise problems with the 32/64 time definitions
381 posix_fstat(int fd, struct stat *buffer)
383 FILE_FUNCTION(FDMAP_IO_ANY, fstat(handle, buffer))
387 * POSIX equivalent for lseek().
390 posix_lseek(int fd, long offset, int origin)
392 FILE_FUNCTION(FDMAP_IO_FILE, _lseek(handle, offset, origin))
396 * POSIX equivalent for open().
397 * Implements file locks when opening files to provide equivalent
401 posix_open(const char *fname, int oflag, ...)
404 int pmode = 0, new_fd;
407 if (oflag & O_CREAT) {
409 pmode = va_arg(ap, int);
413 if ((new_fd = get_fd()) < 0)
417 * We don't implement fcntl() for F_SETLK. Instead, we lock *all*
418 * files we open. Not ideal, but it works for Empire.
420 handle = _sopen(fname, oflag,
421 oflag & O_RDONLY ? SH_DENYNO : SH_DENYWR, pmode);
426 set_fd(new_fd, FDMAP_IO_FILE, handle);
430 #define SHARED_FUNCTION(socket_expr, file_expr) \
433 enum fdmap_io_type type; \
435 if (!lookup_handle(fd, FDMAP_IO_ANY, EBADF, &type, &handle)) \
439 case FDMAP_IO_SOCKET: \
440 result = (socket_expr); \
441 if (result == SOCKET_ERROR) { \
442 errno = WSAGetLastError(); \
446 case FDMAP_IO_FILE: \
447 return (file_expr); \
453 * POSIX equivalent for read().
456 posix_read(int fd, void *buffer, unsigned int count)
458 SHARED_FUNCTION(recv(handle, buffer, count, 0),
459 _read(handle, buffer, count))
463 * POSIX equivalent for readv
464 * Modelled after the GNU's libc/sysdeps/posix/readv.c
467 readv(int fd, const struct iovec *iov, int iovcnt)
470 unsigned char *buffer, *buffer_location;
471 size_t total_bytes = 0;
475 for (i = 0; i < iovcnt; i++) {
476 total_bytes += iov[i].iov_len;
479 buffer = malloc(total_bytes);
483 bytes_read = posix_read(fd, buffer, total_bytes);
484 if (bytes_read <= 0) {
489 bytes_left = bytes_read;
490 buffer_location = buffer;
491 for (i = 0; i < iovcnt; i++) {
492 size_t copy = MIN(iov[i].iov_len, bytes_left);
494 memcpy(iov[i].iov_base, buffer_location, copy);
496 buffer_location += copy;
508 * POSIX equivalent for write().
511 posix_write(int fd, const void *buffer, unsigned int count)
513 SHARED_FUNCTION(send(handle, buffer, count, 0),
514 _write(handle, buffer, count))
518 * POSIX equivalent for writev
519 * Modelled after the GNU's libc/sysdeps/posix/writev.c
522 writev(int fd, const struct iovec *iov, int iovcnt)
525 unsigned char *buffer, *buffer_location;
526 size_t total_bytes = 0;
529 for (i = 0; i < iovcnt; i++)
530 total_bytes += iov[i].iov_len;
532 if (total_bytes == 0)
535 buffer = malloc(total_bytes);
539 buffer_location = buffer;
540 for (i = 0; i < iovcnt; i++) {
541 memcpy(buffer_location, iov[i].iov_base, iov[i].iov_len);
542 buffer_location += iov[i].iov_len;
545 bytes_written = posix_write(fd, buffer, total_bytes);
549 if (bytes_written <= 0)
551 return bytes_written;
555 * POSIX equivalent for fileno().
556 * As fopen/fclose/fcloseall are not implemented as POSIX
557 * equivalent functions, the mapping is done when required
558 * by a call to fileno(). The garbage collection of the
559 * file descriptors allocated is done in set_fd() when the
563 posix_fileno(FILE *stream)
568 if (stream == NULL) {
573 handle = _fileno(stream);
575 fd = lookup_fd(handle, FDMAP_IO_FILE);
579 if ((fd = get_fd()) < 0) {
584 set_fd(fd, FDMAP_IO_FILE, handle);
589 * POSIX equivalent for fcntl().
590 * Currently supports only the F_GETFL/F_SETFL/O_NONBLOCK
591 * Currently ignores F_GETLK/F_SETLK as the file locks are
592 * implement in open()
595 fcntl(int fd, int cmd, ...)
599 unsigned int nonblocking;
603 enum fdmap_io_type type;
605 if (!lookup_handle(fd, FDMAP_IO_ANY, EBADF, &type, &handle))
612 * F_GETFL and F_SETFL only support O_NONBLOCK
613 * for sockets currently
615 if (type == FDMAP_IO_SOCKET) {
616 result = WSAIoctl(handle, FIONBIO, NULL, 0,&nonblocking,
617 sizeof (nonblocking), &bytes_returned, NULL, NULL);
620 errno = WSAGetLastError();
631 if (type == FDMAP_IO_SOCKET) {
633 value = va_arg(ap, int);
635 if (value & O_NONBLOCK)
640 result = WSAIoctl(handle, FIONBIO, &nonblocking,
641 sizeof (nonblocking), NULL, 0, &bytes_returned,
645 errno = WSAGetLastError();
653 * The POSIX equivalent is not available in WIN32
654 * That implement the file locking in the file open
655 * by using sopen instead of open.