empire/empserver
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Revamp server's Windows POSIX compatibility code

Browse source 
Unlike POSIX sockets, Windows sockets are not file descriptors, but
"OS handles", with a completely separate set of functions.

However, Windows can create a file descriptor for a socket, and return
a file descriptor's underlying handle.  Use that instead of wrapping
our own file descriptors around Windows file descriptors and sockets.

Remove the wrapping machinery: MAX_FDS, enum fdmap_io_type, struct
fdmap, fdmap[], nfd, get_fd(), free_fd(), set_fd(), lookup_handle(),
lookup_fd().

Rewrite SOCKET_FUNCTION(), posix_accept(), posix_socket(),
posix_close(), ftruncate(), posix_open(), posix_read(), posix_write(),
fcntl().

Remove FILE_FUNCTION(), posix_fstat(), posix_lseek(),
SHARED_FUNCTION(), and fileno(), because the system's functions now
work fine.

posix_fsync() is used only #ifdef _WIN32, remove it, and call
_commit() directly.

The old code stuffed WSA error codes into errno, which doesn't work.
Use new w32_set_winsock_errno() to retrieve, convert & stuff into
errno.  Adapt inet_ntop() to set the WSA error code instead of errno,
so it can use w32_set_winsock_errno().

Move EWOULDBLOCK from sys/socket.h to w32misc.h, and drop unused
ENOTSOCK, EAFNOSUPPORT.

Use SOCKET rather than int in Windows-specific code.
This commit is contained in:
Markus Armbruster 2009-04-13 15:35:40 +02:00
parent 798af5b45b
commit 1c08ccf25b
6 changed files with 156 additions and 397 deletions
Download patch file Download diff file Expand all files Collapse all files

2
src/lib/commands/powe.c
View file

@ -324,7 +324,7 @@ gen_power(struct powstr *powbuf, int save)
* write(), they delay it until the write actually hits the disk.
* Bad, because `power' displays that time. Force it.
*/
fsync(empfile[EF_POWER].fd);
_commit(empfile[EF_POWER].fd);
#endif
}

16
src/lib/empthread/ntthread.c
View file

@ -56,10 +56,6 @@
#undef NS_ALL
#include <windows.h>
#include <process.h>
/* Note: unistd.h(posixio.c) is not thread-safe.
* It may be used *only* while holding hThreadMutex.
*/
#include "unistd.h"
#include "misc.h"
#include "empthread.h"
#include "prototypes.h"
@ -537,7 +533,7 @@ empth_yield(void)
int
empth_select(int fd, int flags, struct timeval *timeout)
{
int handle;
SOCKET sock;
WSAEVENT hEventObject[2];
long events;
DWORD result, msec;
@ -551,15 +547,15 @@ empth_select(int fd, int flags, struct timeval *timeout)
hEventObject[0] = WSACreateEvent();
hEventObject[1] = pThread->hThreadEvent;
handle = posix_fd2socket(fd);
CANT_HAPPEN(handle < 0);
sock = posix_fd2socket(fd);
CANT_HAPPEN(sock == (SOCKET)-1);
events = 0;
if (flags & EMPTH_FD_READ)
events |= FD_READ | FD_ACCEPT | FD_CLOSE;
if (flags & EMPTH_FD_WRITE)
events |= FD_WRITE | FD_CLOSE;
WSAEventSelect(handle, hEventObject[0], events);
WSAEventSelect(sock, hEventObject[0], events);
if (timeout)
msec = timeout->tv_sec * 1000L + timeout->tv_usec / 1000L;
@ -576,7 +572,7 @@ empth_select(int fd, int flags, struct timeval *timeout)
res = 0;
break;
case WSA_WAIT_FAILED:
errno = WSAGetLastError();
w32_set_winsock_errno();
res = -1;
break;
default:
@ -585,7 +581,7 @@ empth_select(int fd, int flags, struct timeval *timeout)
res = -1;
}
WSAEventSelect(handle, hEventObject[0], 0);
WSAEventSelect(sock, hEventObject[0], 0);
WSACloseEvent(hEventObject[0]);

496
src/lib/w32/posixio.c
View file

@ -25,22 +25,19 @@
*
* ---
*
* posixio.c: POSIX IO emulation layer for WIN32
* posixio.c: POSIX I/O emulation layer for WIN32
*
* Known contributors to this file:
* Ron Koenderink, 2007
* Markus Armbruster, 2007-2008
* Markus Armbruster, 2007-2009
*/
/*
* POSIX has just one kind of file descriptors, while Windows has (at
* least) two: one for sockets and one for files, with separate
* functions to operate on them. To present a more POSIX-like
* interface to our application code, we provide a compatibility layer
* that maps POSIX file descriptors to sockets and file handles behind
* the scenes. This actual mapping is done by the fdmap. It doesn't
* implement the finer points of POSIX correctly. In particular, the
* actual values of the file descriptors usually differ.
* POSIX sockets are file descriptors. Windows sockets are something
* else, with a separate set of functions to operate on them. To
* present a more POSIX-like interface to our application code, we
* provide a compatibility layer that wraps file descriptors around
* sockets.
*/
#include <config.h>
@ -65,163 +62,69 @@
#include "sys/uio.h"
#include "unistd.h"
/*
* FD_SETSIZE is the size for the maximum number of sockets.
* The number of file descriptors is in a variable _nhandle
* based on the assertion output. In order the simplify the
* code and skip dynamic allocation, used double the socket size.
*/
#define MAX_FDS (FD_SETSIZE * 2)
#define W32_FD_TO_SOCKET(fd) ((SOCKET)_get_osfhandle((fd)))
#define W32_SOCKET_TO_FD(fh) (_open_osfhandle((long)(fh), O_RDWR | O_BINARY))
enum fdmap_io_type {
FDMAP_IO_NOTUSED = 0,
FDMAP_IO_FILE,
FDMAP_IO_SOCKET,
FDMAP_IO_ANY /* used for searching only (lookup_handle) */
};
struct fdmap {
int handle;
enum fdmap_io_type type;
};
static struct fdmap fdmap[MAX_FDS] = {
{0, FDMAP_IO_FILE},
{1, FDMAP_IO_FILE},
{2, FDMAP_IO_FILE}
};
static int nfd = 3;
/*
* Allocate a POSIX equivalent file descriptor.
* Note once get_fd() is called either free_fd() or set_fd()
* must be called before thread mutex is released as the
* allocation/deallocation code is not thread safe.
*/
static int
get_fd(void)
{
int fd;
for (fd = 0; fd < nfd && fdmap[fd].type != FDMAP_IO_NOTUSED; fd++) ;
if (fd == MAX_FDS) {
errno = EMFILE;
return -1;
}
if (fd == nfd) {
fdmap[fd].type = FDMAP_IO_NOTUSED;
nfd++;
}
return fd;
}
/*
* Deallocate a POSIX equivalent file descriptor.
*/
static void
free_fd(int fd)
{
fdmap[fd].type = FDMAP_IO_NOTUSED;
for(; fdmap[nfd - 1].type == FDMAP_IO_NOTUSED; nfd--) ;
}
/*
* Complete the allocation of the file descriptor.
*/
static void
set_fd(int fd, enum fdmap_io_type type, int handle)
{
int i;
fdmap[fd].handle = handle;
fdmap[fd].type = type;
/*
* Garbage collection for fileno(), currently not
* replacing fclose() and fcloseall() so do not know when
* a stream is closed.
*/
for (i = 0; i < nfd; i++) {
if (i != fd && type == fdmap[i].type && handle == fdmap[i].handle)
free_fd(i);
}
}
/*
* Find the windows handle (file or socket) for file descriptor.
* Return windows handle and type of handle.
* You can search for a specific type (FDMAP_IO_FILE or FDMAP_IO_SOCKET)
* or for both search by using FDMAP_IO_ANY.
* FDMAP_IO_NOTUSED is not valid type to search with.
*/
static int
lookup_handle(int fd, enum fdmap_io_type d_type, int error,
enum fdmap_io_type *type_ptr, int *handle_ptr)
{
if (fd < 0 || fd >= MAX_FDS) {
if (error != 0)
errno = error;
return 0;
} else if ((fdmap[fd].type != d_type && d_type != FDMAP_IO_ANY) ||
(fdmap[fd].type == FDMAP_IO_NOTUSED && d_type == FDMAP_IO_ANY)) {
if (error != 0)
errno = error;
return 0;
}
if (type_ptr != NULL)
*type_ptr = fdmap[fd].type;
if (handle_ptr != NULL)
*handle_ptr = fdmap[fd].handle;
return 1;
}
/*
* Find and return the file descriptor associated with windows handle.
* You can search for FDMAP_IO_FILE or FDMAP_IO_SOCKET.
* FDMAP_IO_ANY or FDMAP_IO_NOTUSED is not considered valid search
* criteria.
*/
static int
lookup_fd(int handle, enum fdmap_io_type d_type)
{
int i;
for (i = 0; i < nfd; i++)
if (fdmap[i].handle == handle && fdmap[i].type == d_type)
return i;
return -1;
}
/*
* Get the window socket handle for POSIX file descriptor.
*/
int
SOCKET
posix_fd2socket(int fd)
{
int handle;
enum fdmap_io_type type;
if (!lookup_handle(fd, FDMAP_IO_SOCKET, WSAENOTSOCK,
&type, &handle))
return INVALID_SOCKET;
return handle;
return W32_FD_TO_SOCKET(fd);
}
#define SOCKET_FUNCTION(expr) \
int result; \
int handle; \
\
if (!lookup_handle(fd, FDMAP_IO_SOCKET, \
ENOTSOCK, NULL, &handle)) \
return -1; \
\
result = (expr); \
if (result == SOCKET_ERROR) { \
errno = WSAGetLastError(); \
return -1; \
} \
return result;
static int
fd_is_socket(int fd, SOCKET *sockp)
{
SOCKET sock;
WSANETWORKEVENTS ev;
sock = W32_FD_TO_SOCKET(fd);
if (sockp)
*sockp = sock;
return WSAEnumNetworkEvents(sock, NULL, &ev) == 0;
}
void
w32_set_winsock_errno(void)
{
int err = WSAGetLastError();
WSASetLastError(0);
/* Map some WSAE* errors to the runtime library's error codes. */
switch (err)
{
case WSA_INVALID_HANDLE:
errno = EBADF;
break;
case WSA_NOT_ENOUGH_MEMORY:
errno = ENOMEM;
break;
case WSA_INVALID_PARAMETER:
errno = EINVAL;
break;
case WSAEWOULDBLOCK:
errno = EAGAIN;
break;
case WSAENAMETOOLONG:
errno = ENAMETOOLONG;
break;
case WSAENOTEMPTY:
errno = ENOTEMPTY;
break;
default:
errno = (err > 10000 && err < 10025) ? err - 10000 : err;
break;
}
}
#define SOCKET_FUNCTION(expr) do { \
SOCKET sock = W32_FD_TO_SOCKET(fd); \
int res = (expr); \
if (res == SOCKET_ERROR) { \
w32_set_winsock_errno(); \
return -1; \
} \
return res; \
} while (0)
/*
* POSIX equivalent for accept().
@ -230,25 +133,15 @@ posix_fd2socket(int fd)
int
posix_accept(int fd, struct sockaddr *addr, socklen_t *addrlen)
{
int new_fd;
int handle;
SOCKET new_handle;
SOCKET sock;
if (!lookup_handle(fd, FDMAP_IO_SOCKET, ENOTSOCK, NULL, &handle))
return -1;
new_fd = get_fd();
if (new_fd < 0)
return -1;
new_handle = accept(handle, addr, addrlen);
if (new_handle == INVALID_SOCKET) {
free_fd(new_fd);
errno = WSAGetLastError();
sock = accept(W32_FD_TO_SOCKET(fd), addr, addrlen);
if (sock == INVALID_SOCKET) {
w32_set_winsock_errno();
return -1;
}
set_fd(new_fd, FDMAP_IO_SOCKET, (int)new_handle);
return new_fd;
return W32_SOCKET_TO_FD(sock);
}
/*
@ -258,7 +151,7 @@ posix_accept(int fd, struct sockaddr *addr, socklen_t *addrlen)
int
posix_bind(int fd, const struct sockaddr *name, socklen_t namelen)
{
SOCKET_FUNCTION(bind(handle, name, namelen))
SOCKET_FUNCTION(bind(sock, name, namelen));
}
/*
@ -268,7 +161,7 @@ posix_bind(int fd, const struct sockaddr *name, socklen_t namelen)
int
posix_listen(int fd, int backlog)
{
SOCKET_FUNCTION(listen(handle, backlog))
SOCKET_FUNCTION(listen(sock, backlog));
}
/*
@ -291,8 +184,7 @@ posix_setsockopt(int fd, int level, int optname,
if (level == SOL_SOCKET && optname == SO_REUSEADDR)
return 0;
{
SOCKET_FUNCTION(setsockopt(handle, level, optname,
optval, optlen))
SOCKET_FUNCTION(setsockopt(sock, level, optname, optval, optlen));
}
}
@ -303,7 +195,7 @@ posix_setsockopt(int fd, int level, int optname,
int
posix_shutdown(int fd, int how)
{
SOCKET_FUNCTION(shutdown(handle, how))
SOCKET_FUNCTION(shutdown(sock, how));
}
/*
@ -313,20 +205,18 @@ posix_shutdown(int fd, int how)
int
posix_socket(int domain, int type, int protocol)
{
SOCKET handle;
int new_fd;
SOCKET sock;
if ((new_fd = get_fd()) < 0)
return -1;
handle = socket(domain, type, protocol);
if (handle == INVALID_SOCKET) {
free_fd(new_fd);
errno = WSAGetLastError();
/*
* We have to use WSASocket() to create non-overlapped IO sockets.
* Overlapped IO sockets cannot be used with read/write.
*/
sock = WSASocket(domain, type, protocol, NULL, 0, 0);
if (sock == INVALID_SOCKET) {
w32_set_winsock_errno();
return -1;
}
set_fd(new_fd, FDMAP_IO_SOCKET, (int)handle);
return new_fd;
return W32_SOCKET_TO_FD(sock);
}
#ifdef HAVE_GETADDRINFO
@ -351,12 +241,14 @@ inet_ntop(int af, const void *src, char *dst, socklen_t len)
sa = (struct sockaddr *)&sin6;
salen = sizeof(sin6);
} else {
errno = EAFNOSUPPORT;
WSASetLastError(WSAEAFNOSUPPORT);
w32_set_winsock_errno();
return NULL;
}
if (getnameinfo(sa, salen, dst, len, NULL, 0, NI_NUMERICHOST)) {
errno = EAFNOSUPPORT;
WSASetLastError(WSAEAFNOSUPPORT);
w32_set_winsock_errno();
return NULL;
}
@ -364,85 +256,27 @@ inet_ntop(int af, const void *src, char *dst, socklen_t len)
}
#endif
#define FILE_FUNCTION(type, expr) \
int handle; \
\
if (!lookup_handle(fd, (type), EBADF, NULL, &handle)) \
return -1; \
\
return (expr);
/*
* POSIX equivalent for close().
*/
int
posix_close(int fd)
{
int result;
int handle;
enum fdmap_io_type type;
SOCKET sock;
if (!lookup_handle(fd, FDMAP_IO_ANY, EBADF, &type, &handle))
return -1;
free_fd(fd);
switch (type) {
case FDMAP_IO_SOCKET:
result = closesocket(handle);
if (result == SOCKET_ERROR) {
errno = WSAGetLastError();
if (fd_is_socket(fd, &sock)) {
if (closesocket(sock)) {
w32_set_winsock_errno();
return -1;
}
return result;
case FDMAP_IO_FILE:
return _close(handle);
default:
CANT_REACH();
return -1;
/*
* This always fails because the underlying handle is already
* gone, but it closes the fd just fine.
*/
_close(fd);
return 0;
}
}
/*
* posix_fsync forces file sync with the disk.
* In order for the power report report to accurate timestamp,
* the _commit() is to force a sync with disk and therefore
* an update for file time.
*/
int
posix_fsync(int fd)
{
FILE_FUNCTION(FDMAP_IO_FILE, _commit(handle))
}
/*
* POSIX ftruncate()
*/
int
ftruncate(int fd, off_t length)
{
FILE_FUNCTION(FDMAP_IO_FILE, _chsize(handle, length))
}
/*
* POSIX equivalent for fstat().
* fstat() is used instead of _fstat(),
* otherwise problems with the 32/64 time definitions
* in WIN32.
*/
#undef fstat
int
posix_fstat(int fd, struct stat *buffer)
{
FILE_FUNCTION(FDMAP_IO_ANY, fstat(handle, buffer))
}
/*
* POSIX equivalent for lseek().
*/
off_t
posix_lseek(int fd, off_t offset, int origin)
{
FILE_FUNCTION(FDMAP_IO_FILE, _lseek(handle, offset, origin))
return _close(fd);
}
/*
@ -454,8 +288,7 @@ int
posix_open(const char *fname, int oflag, ...)
{
va_list ap;
int pmode = 0, new_fd;
int handle;
int pmode = 0;
if (oflag & O_CREAT) {
va_start(ap, oflag);
@ -463,54 +296,31 @@ posix_open(const char *fname, int oflag, ...)
va_end(ap);
}
if ((new_fd = get_fd()) < 0)
return -1;
/*
* We don't implement fcntl() for F_SETLK. Instead, we lock *all*
* files we open. Not ideal, but it works for Empire.
*/
handle = _sopen(fname, oflag,
oflag & O_RDONLY ? SH_DENYNO : SH_DENYWR, pmode);
if (handle == -1) {
free_fd(new_fd);
return -1;
}
set_fd(new_fd, FDMAP_IO_FILE, handle);
return new_fd;
return _sopen(fname, oflag,
oflag & O_RDONLY ? SH_DENYNO : SH_DENYWR,
pmode);
}
#define SHARED_FUNCTION(socket_expr, file_expr) \
int result; \
int handle; \
enum fdmap_io_type type; \
\
if (!lookup_handle(fd, FDMAP_IO_ANY, EBADF, &type, &handle)) \
return -1; \
\
switch (type) { \
case FDMAP_IO_SOCKET: \
result = (socket_expr); \
if (result == SOCKET_ERROR) { \
errno = WSAGetLastError(); \
return -1; \
} \
return result; \
case FDMAP_IO_FILE: \
return (file_expr); \
default: \
CANT_REACH(); \
return -1; \
}
/*
* POSIX equivalent for read().
*/
ssize_t
posix_read(int fd, void *buffer, size_t count)
posix_read(int fd, void *buf, size_t sz)
{
SHARED_FUNCTION(recv(handle, buffer, count, 0),
_read(handle, buffer, count))
SOCKET sock;
ssize_t res;
if (fd_is_socket(fd, &sock)) {
res = recv(sock, buf, sz, 0);
if (res < 0)
w32_set_winsock_errno();
return res;
}
return _read(fd, buf, sz);
}
/*
@ -564,10 +374,18 @@ readv(int fd, const struct iovec *iov, int iovcnt)
* POSIX equivalent for write().
*/
ssize_t
posix_write(int fd, const void *buffer, size_t count)
posix_write(int fd, const void *buf, size_t sz)
{
SHARED_FUNCTION(send(handle, buffer, count, 0),
_write(handle, buffer, count))
SOCKET sock;
ssize_t res;
if (fd_is_socket(fd, &sock)) {
res = send(sock, buf, sz, 0);
if (res < 0)
w32_set_winsock_errno();
return res;
}
return _write(fd, buf, sz);
}
/*
@ -606,40 +424,6 @@ writev(int fd, const struct iovec *iov, int iovcnt)
return bytes_written;
}
/*
* POSIX equivalent for fileno().
* As fopen/fclose/fcloseall are not implemented as POSIX
* equivalent functions, the mapping is done when required
* by a call to fileno(). The garbage collection of the
* file descriptors allocated is done in set_fd() when the
* handle is reused.
*/
int
fileno(FILE *stream)
{
int fd;
int handle;
if (stream == NULL) {
errno = EBADF;
return -1;
}
handle = _fileno(stream);
fd = lookup_fd(handle, FDMAP_IO_FILE);
if (fd >= 0)
return fd;
if ((fd = get_fd()) < 0) {
errno = EBADF;
return -1;
}
set_fd(fd, FDMAP_IO_FILE, handle);
return fd;
}
/*
* POSIX equivalent for fcntl().
* Horrible hacks, just good enough support Empire's use of fcntl().
@ -653,32 +437,24 @@ fcntl(int fd, int cmd, ...)
va_list ap;
int value;
unsigned long nonblocking;
int handle;
enum fdmap_io_type type;
if (!lookup_handle(fd, FDMAP_IO_ANY, EBADF, &type, &handle))
return -1;
SOCKET sock;
switch (cmd)
{
case F_GETFL:
if (type == FDMAP_IO_SOCKET)
return 0;
break;
return 0;
case F_SETFL:
if (type == FDMAP_IO_SOCKET) {
va_start(ap, cmd);
value = va_arg(ap, int);
va_end(ap);
nonblocking = (value & O_NONBLOCK) != 0;
sock = W32_FD_TO_SOCKET(fd);
va_start(ap, cmd);
value = va_arg(ap, int);
va_end(ap);
nonblocking = (value & O_NONBLOCK) != 0;
if (ioctlsocket(handle, FIONBIO, &nonblocking) == SOCKET_ERROR) {
errno = WSAGetLastError();
return -1;
}
return 0;
if (ioctlsocket(sock, FIONBIO, &nonblocking) == SOCKET_ERROR) {
w32_set_winsock_errno();
return -1;
}
break;
return 0;
case F_SETLK:
return 0;
}

8
src/lib/w32/sys/socket.h
View file

@ -37,10 +37,6 @@
#include <winsock2.h>
#undef NS_ALL
#define EWOULDBLOCK WSAEWOULDBLOCK
#define ENOTSOCK WSAENOTSOCK
#define EAFNOSUPPORT WSAEAFNOSUPPORT
typedef int socklen_t;
#define accept(fd, addr, addrlen) \
@ -64,4 +60,8 @@ extern int posix_setsockopt(int fd, int level, int optname,
extern int posix_shutdown(int fd, int how);
extern int posix_socket(int domain, int type, int protocol);
/* Low-level stuff specific to the emulation */
extern SOCKET posix_fd2socket(int fd);
extern void w32_set_winsock_errno(void);
#endif /* SYS_SOCKET_H */

25
src/lib/w32/unistd.h
View file

@ -25,10 +25,11 @@
*
* ---
*
* unistd.h: POSIX emulation for WIN32
* unistd.h: POSIX emulation for Windows
*
* Known contributors to this file:
* Ron Koenderink, 2007
* Markus Armbruster, 2007-2009
*/
/*
@ -46,7 +47,6 @@
* here. Major name space pollution, can't be helped.
*/
#include <io.h>
#include <stdio.h>
#include <direct.h>
#include <sys/stat.h>
@ -66,9 +66,6 @@ extern int optind, opterr, optopt;
#define mkdir(dir, perm) posix_mkdir((dir), (perm))
extern int posix_mkdir(const char *dirname, mode_t perm);
/*
* posixio.c
*/
/* Should be in sys/stat.h */
#ifndef S_IRUSR
#define S_IRUSR _S_IREAD
@ -88,9 +85,6 @@ extern int posix_mkdir(const char *dirname, mode_t perm);
#define S_IXOTH 0
#define S_IRWXO S_IROTH | S_IWOTH | S_IXOTH
#endif
#define fstat(fd, buffer) \
posix_fstat((fd), (buffer))
extern int posix_fstat(int fd, struct stat *buffer);
/* Should be in fcntl.h */
#define O_NONBLOCK 1
@ -120,21 +114,12 @@ extern int fcntl(int fd, int cmd, ...);
/* Stuff that actually belongs here */
#define close(fd) \
posix_close((fd))
#define lseek(fd, offset, origin) \
posix_lseek((fd), (offset), (origin))
#define read posix_read
extern ssize_t posix_read(int, void *, size_t);
#define write(fd, buffer, count) \
posix_write((fd), (buffer), (count))
#define fsync(fd) \
posix_fsync((fd))
extern int ftruncate(int fd, off_t length);
extern ssize_t posix_write(int, const void *, size_t);
extern int posix_close(int fd);
extern off_t posix_lseek(int fd, off_t offset, int origin);
extern ssize_t posix_read(int fd, void *buffer, size_t count);
extern ssize_t posix_write(int fd, const void *buffer, size_t count);
extern int posix_fsync(int fd);
/* Low-level stuff specific to the emulation */
extern int posix_fd2socket(int fd);
#define ftruncate(fd, length) _chsize((fd), (length))
#endif /* UNISTD_H */

6
src/lib/w32/w32misc.h
View file

@ -39,14 +39,16 @@
/* integral mismatch, due to misuse of sector short */
#pragma warning (disable : 4761 )
/* strings.h (POSIX) or string.h (GNU) */
/* strings.h */
#define strncasecmp(s1, s2, s3) _strnicmp((s1), (s2), (s3))
#endif /* _MSC_VER */
/* errno.h */
#define EWOULDBLOCK EAGAIN
/* stdio.h */
#define vsnprintf _vsnprintf
#define snprintf _snprintf
#undef fileno
/* stdlib.h */
#include <io.h>