xref: /external/chromium_org/third_party/npapi/npspy/extern/nspr/md/_unixos.h

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/*
 * The contents of this file are subject to the Mozilla Public
 * License Version 1.1 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * The Original Code is the Netscape Portable Runtime (NSPR).
 *
 * The Initial Developer of the Original Code is Netscape
 * Communications Corporation.  Portions created by Netscape are
 * Copyright (C) 1998-2000 Netscape Communications Corporation.  All
 * Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the
 * terms of the GNU General Public License Version 2 or later (the
 * "GPL"), in which case the provisions of the GPL are applicable
 * instead of those above.  If you wish to allow use of your
 * version of this file only under the terms of the GPL and not to
 * allow others to use your version of this file under the MPL,
 * indicate your decision by deleting the provisions above and
 * replace them with the notice and other provisions required by
 * the GPL.  If you do not delete the provisions above, a recipient
 * may use your version of this file under either the MPL or the
 * GPL.
 */

#ifndef prunixos_h___
#define prunixos_h___

/*
 * If FD_SETSIZE is not defined on the command line, set the default value
 * before include select.h
 */
/*
 * Linux: FD_SETSIZE is defined in /usr/include/sys/select.h and should
 * not be redefined.
 */
#if !defined(LINUX) && !defined(DARWIN) && !defined(NEXTSTEP)
#ifndef FD_SETSIZE
#define FD_SETSIZE  4096
#endif
#endif

#include <unistd.h>
#include <stddef.h>
#include <sys/stat.h>
#include <dirent.h>
#include <errno.h>

#include "prio.h"
#include "prmem.h"
#include "prclist.h"

/*
 * For select(), fd_set, and struct timeval.
 *
 * In The Single UNIX(R) Specification, Version 2,
 * the header file for select() is <sys/time.h>.
 *
 * fd_set is defined in <sys/types.h>.  Usually
 * <sys/time.h> includes <sys/types.h>, but on some
 * older systems <sys/time.h> does not include
 * <sys/types.h>, so we include it explicitly.
 */
#include <sys/time.h>
#include <sys/types.h>
#if defined(AIX)  /* Only pre-4.2 AIX needs it, but for simplicity... */
#include <sys/select.h>
#endif

#define PR_DIRECTORY_SEPARATOR		'/'
#define PR_DIRECTORY_SEPARATOR_STR	"/"
#define PR_PATH_SEPARATOR		':'
#define PR_PATH_SEPARATOR_STR		":"
#define GCPTR
typedef int (*FARPROC)();

/*
 * intervals at which GLOBAL threads wakeup to check for pending interrupt
 */
#define _PR_INTERRUPT_CHECK_INTERVAL_SECS 5
extern PRIntervalTime intr_timeout_ticks;

/*
 * The bit flags for the in_flags and out_flags fields
 * of _PR_UnixPollDesc
 */
#ifdef _PR_USE_POLL
#define _PR_UNIX_POLL_READ    POLLIN
#define _PR_UNIX_POLL_WRITE   POLLOUT
#define _PR_UNIX_POLL_EXCEPT  POLLPRI
#define _PR_UNIX_POLL_ERR     POLLERR
#define _PR_UNIX_POLL_NVAL    POLLNVAL
#define _PR_UNIX_POLL_HUP     POLLHUP
#else /* _PR_USE_POLL */
#define _PR_UNIX_POLL_READ    0x1
#define _PR_UNIX_POLL_WRITE   0x2
#define _PR_UNIX_POLL_EXCEPT  0x4
#define _PR_UNIX_POLL_ERR     0x8
#define _PR_UNIX_POLL_NVAL    0x10
#define _PR_UNIX_POLL_HUP     0x20
#endif /* _PR_USE_POLL */

typedef struct _PRUnixPollDesc {
	PRInt32 osfd;
	PRInt16 in_flags;
	PRInt16 out_flags;
} _PRUnixPollDesc;

typedef struct PRPollQueue {
    PRCList links;        /* for linking PRPollQueue's together */
    _PRUnixPollDesc *pds;        /* array of poll descriptors */
    PRUintn npds;            /* length of the array */
    PRPackedBool on_ioq;    /* is this on the async i/o work q? */
    PRIntervalTime timeout;        /* timeout, in ticks */
    struct PRThread *thr;
} PRPollQueue;

#define _PR_POLLQUEUE_PTR(_qp) \
    ((PRPollQueue*) ((char*) (_qp) - offsetof(PRPollQueue,links)))


extern PRInt32 _PR_WaitForMultipleFDs(
    _PRUnixPollDesc *unixpds,
    PRInt32 pdcnt,
    PRIntervalTime timeout);
extern void _PR_Unblock_IO_Wait(struct PRThread *thr);

#if defined(_PR_LOCAL_THREADS_ONLY) || defined(_PR_GLOBAL_THREADS_ONLY)
#define _MD_CHECK_FOR_EXIT()
#endif

extern fd_set _pr_md_read_set, _pr_md_write_set, _pr_md_exception_set;
extern PRInt16 _pr_md_read_cnt[], _pr_md_write_cnt[], _pr_md_exception_cnt[];
extern PRInt32 _pr_md_ioq_max_osfd;
extern PRUint32 _pr_md_ioq_timeout;

struct _MDFileDesc {
    int osfd;
#if defined(LINUX) && defined(_PR_PTHREADS)
    int tcp_nodelay;  /* used by pt_LinuxSendFile */
#endif
};

struct _MDDir {
	DIR *d;
};

struct _PRCPU;
extern void _MD_unix_init_running_cpu(struct _PRCPU *cpu);

/*
** Make a redzone at both ends of the stack segment. Disallow access
** to those pages of memory. It's ok if the mprotect call's don't
** work - it just means that we don't really have a functional
** redzone.
*/
#include <sys/mman.h>
#ifndef PROT_NONE
#define PROT_NONE 0x0
#endif

#if defined(DEBUG) && !defined(DARWIN) && !defined(NEXTSTEP)
#if !defined(SOLARIS)
#include <string.h>  /* for memset() */
#define _MD_INIT_STACK(ts,REDZONE)					\
    PR_BEGIN_MACRO                 					\
	(void) mprotect((void*)ts->seg->vaddr, REDZONE, PROT_NONE);	\
	(void) mprotect((void*) ((char*)ts->seg->vaddr + REDZONE + ts->stackSize),\
			REDZONE, PROT_NONE);				\
    /*									\
    ** Fill stack memory with something that turns into an illegal	\
    ** pointer value. This will sometimes find runtime references to	\
    ** uninitialized pointers. We don't do this for solaris because we	\
    ** can use purify instead.						\
    */									\
    if (_pr_debugStacks) {						\
	memset(ts->allocBase + REDZONE, 0xf7, ts->stackSize);		\
    }									\
    PR_END_MACRO
#else	/* !SOLARIS	*/
#define _MD_INIT_STACK(ts,REDZONE)					\
    PR_BEGIN_MACRO                 					\
	(void) mprotect((void*)ts->seg->vaddr, REDZONE, PROT_NONE);	\
	(void) mprotect((void*) ((char*)ts->seg->vaddr + REDZONE + ts->stackSize),\
			REDZONE, PROT_NONE);				\
    PR_END_MACRO
#endif	/* !SOLARIS	*/

/*
 * _MD_CLEAR_STACK
 *	Allow access to the redzone pages; the access was turned off in
 *	_MD_INIT_STACK.
 */
#define _MD_CLEAR_STACK(ts)						\
    PR_BEGIN_MACRO                 					\
	(void) mprotect((void*)ts->seg->vaddr, REDZONE, PROT_READ|PROT_WRITE);\
	(void) mprotect((void*) ((char*)ts->seg->vaddr + REDZONE + ts->stackSize),\
			REDZONE, PROT_READ|PROT_WRITE);			\
    PR_END_MACRO

#else	/* DEBUG */

#define _MD_INIT_STACK(ts,REDZONE)
#define _MD_CLEAR_STACK(ts)

#endif	/* DEBUG */

#if !defined(SOLARIS)

#define PR_SET_INTSOFF(newval)

#endif

/************************************************************************/

extern void _PR_UnixInit(void);

/************************************************************************/

struct _MDProcess {
    pid_t pid;
};

struct PRProcess;
struct PRProcessAttr;

/* Create a new process (fork() + exec()) */
#define _MD_CREATE_PROCESS _MD_CreateUnixProcess
extern struct PRProcess * _MD_CreateUnixProcess(
    const char *path,
    char *const *argv,
    char *const *envp,
    const struct PRProcessAttr *attr
);

#define _MD_DETACH_PROCESS _MD_DetachUnixProcess
extern PRStatus _MD_DetachUnixProcess(struct PRProcess *process);

/* Wait for a child process to terminate */
#define _MD_WAIT_PROCESS _MD_WaitUnixProcess
extern PRStatus _MD_WaitUnixProcess(struct PRProcess *process,
    PRInt32 *exitCode);

#define _MD_KILL_PROCESS _MD_KillUnixProcess
extern PRStatus _MD_KillUnixProcess(struct PRProcess *process);

/************************************************************************/

extern void _MD_EnableClockInterrupts(void);
extern void _MD_DisableClockInterrupts(void);

#define _MD_START_INTERRUPTS			_MD_StartInterrupts
#define _MD_STOP_INTERRUPTS				_MD_StopInterrupts
#define _MD_DISABLE_CLOCK_INTERRUPTS	_MD_DisableClockInterrupts
#define _MD_ENABLE_CLOCK_INTERRUPTS		_MD_EnableClockInterrupts
#define _MD_BLOCK_CLOCK_INTERRUPTS		_MD_BlockClockInterrupts
#define _MD_UNBLOCK_CLOCK_INTERRUPTS	_MD_UnblockClockInterrupts

/************************************************************************/

extern void		_MD_InitCPUS(void);
#define _MD_INIT_CPUS           _MD_InitCPUS

extern void		_MD_Wakeup_CPUs(void);
#define _MD_WAKEUP_CPUS _MD_Wakeup_CPUs

#define _MD_PAUSE_CPU			_MD_PauseCPU

#if defined(_PR_LOCAL_THREADS_ONLY) || defined(_PR_GLOBAL_THREADS_ONLY)
#define _MD_CLEANUP_BEFORE_EXIT()
#endif

#ifndef IRIX
#define _MD_EXIT(status)		_exit(status)
#endif

/************************************************************************/

#define _MD_GET_ENV				getenv
#define _MD_PUT_ENV				putenv

/************************************************************************/

#define _MD_INIT_FILEDESC(fd)

extern void		_MD_MakeNonblock(PRFileDesc *fd);
#define _MD_MAKE_NONBLOCK			_MD_MakeNonblock

/************************************************************************/

#if !defined(_PR_PTHREADS)

extern void		_MD_InitSegs(void);
extern PRStatus	_MD_AllocSegment(PRSegment *seg, PRUint32 size,
				void *vaddr);
extern void		_MD_FreeSegment(PRSegment *seg);

#define _MD_INIT_SEGS			_MD_InitSegs
#define _MD_ALLOC_SEGMENT		_MD_AllocSegment
#define _MD_FREE_SEGMENT		_MD_FreeSegment

#endif /* !defined(_PR_PTHREADS) */

/************************************************************************/

#if !defined(HPUX_LW_TIMER)
#define _MD_INTERVAL_INIT()
#endif
#define _MD_INTERVAL_PER_MILLISEC()	(_PR_MD_INTERVAL_PER_SEC() / 1000)
#define _MD_INTERVAL_PER_MICROSEC()	(_PR_MD_INTERVAL_PER_SEC() / 1000000)

/************************************************************************/

#define _MD_ERRNO()             	(errno)
#define _MD_GET_SOCKET_ERROR()		(errno)

/************************************************************************/

extern PRInt32 _MD_AvailableSocket(PRInt32 osfd);

extern void _MD_StartInterrupts(void);
extern void _MD_StopInterrupts(void);
extern void _MD_DisableClockInterrupts(void);
extern void _MD_BlockClockInterrupts(void);
extern void _MD_UnblockClockInterrupts(void);
extern void _MD_PauseCPU(PRIntervalTime timeout);

extern PRStatus _MD_open_dir(struct _MDDir *, const char *);
extern PRInt32  _MD_close_dir(struct _MDDir *);
extern char *   _MD_read_dir(struct _MDDir *, PRIntn);
extern PRInt32  _MD_open(const char *name, PRIntn osflags, PRIntn mode);
extern PRInt32	_MD_delete(const char *name);
extern PRInt32	_MD_getfileinfo(const char *fn, PRFileInfo *info);
extern PRInt32  _MD_getfileinfo64(const char *fn, PRFileInfo64 *info);
extern PRInt32  _MD_getopenfileinfo(const PRFileDesc *fd, PRFileInfo *info);
extern PRInt32  _MD_getopenfileinfo64(const PRFileDesc *fd, PRFileInfo64 *info);
extern PRInt32	_MD_rename(const char *from, const char *to);
extern PRInt32	_MD_access(const char *name, PRAccessHow how);
extern PRInt32	_MD_mkdir(const char *name, PRIntn mode);
extern PRInt32	_MD_rmdir(const char *name);
extern PRInt32	_MD_accept_read(PRInt32 sock, PRInt32 *newSock,
				PRNetAddr **raddr, void *buf, PRInt32 amount);
extern PRInt32 	_PR_UnixSendFile(PRFileDesc *sd, PRSendFileData *sfd,
			PRTransmitFileFlags flags, PRIntervalTime timeout);

extern PRStatus _MD_LockFile(PRInt32 osfd);
extern PRStatus _MD_TLockFile(PRInt32 osfd);
extern PRStatus _MD_UnlockFile(PRInt32 osfd);

#define _MD_OPEN_DIR(dir, name)		    _MD_open_dir(dir, name)
#define _MD_CLOSE_DIR(dir)		        _MD_close_dir(dir)
#define _MD_READ_DIR(dir, flags)	    _MD_read_dir(dir, flags)
#define _MD_OPEN(name, osflags, mode)	_MD_open(name, osflags, mode)
#define _MD_OPEN_FILE(name, osflags, mode)	_MD_open(name, osflags, mode)
extern PRInt32 _MD_read(PRFileDesc *fd, void *buf, PRInt32 amount);
#define _MD_READ(fd,buf,amount)		    _MD_read(fd,buf,amount)
extern PRInt32 _MD_write(PRFileDesc *fd, const void *buf, PRInt32 amount);
#define _MD_WRITE(fd,buf,amount)	    _MD_write(fd,buf,amount)
#define _MD_DELETE(name)		        _MD_delete(name)
#define _MD_GETFILEINFO(fn, info)	    _MD_getfileinfo(fn, info)
#define _MD_GETFILEINFO64(fn, info)	    _MD_getfileinfo64(fn, info)
#define _MD_GETOPENFILEINFO(fd, info)	_MD_getopenfileinfo(fd, info)
#define _MD_GETOPENFILEINFO64(fd, info)	_MD_getopenfileinfo64(fd, info)
#define _MD_RENAME(from, to)		    _MD_rename(from, to)
#define _MD_ACCESS(name, how)		    _MD_access(name, how)
#define _MD_MKDIR(name, mode)		    _MD_mkdir(name, mode)
#define _MD_MAKE_DIR(name, mode)		_MD_mkdir(name, mode)
#define _MD_RMDIR(name)			        _MD_rmdir(name)
#define _MD_ACCEPT_READ(sock, newSock, raddr, buf, amount)	_MD_accept_read(sock, newSock, raddr, buf, amount)

#define _MD_LOCKFILE _MD_LockFile
#define _MD_TLOCKFILE _MD_TLockFile
#define _MD_UNLOCKFILE _MD_UnlockFile


extern PRInt32		_MD_socket(int af, int type, int flags);
#define _MD_SOCKET	_MD_socket
extern PRInt32		_MD_connect(PRFileDesc *fd, const PRNetAddr *addr,
								PRUint32 addrlen, PRIntervalTime timeout);
#define _MD_CONNECT	_MD_connect
extern PRInt32		_MD_accept(PRFileDesc *fd, PRNetAddr *addr, PRUint32 *addrlen,
													PRIntervalTime timeout);
#define _MD_ACCEPT	_MD_accept
extern PRInt32		_MD_bind(PRFileDesc *fd, const PRNetAddr *addr, PRUint32 addrlen);
#define _MD_BIND	_MD_bind
extern PRInt32		_MD_listen(PRFileDesc *fd, PRIntn backlog);
#define _MD_LISTEN	_MD_listen
extern PRInt32		_MD_shutdown(PRFileDesc *fd, PRIntn how);
#define _MD_SHUTDOWN	_MD_shutdown

extern PRInt32		_MD_recv(PRFileDesc *fd, void *buf, PRInt32 amount,
                               PRIntn flags, PRIntervalTime timeout);
#define _MD_RECV	_MD_recv
extern PRInt32		_MD_send(PRFileDesc *fd, const void *buf, PRInt32 amount,
									PRIntn flags, PRIntervalTime timeout);
#define _MD_SEND	_MD_send
extern PRInt32		_MD_recvfrom(PRFileDesc *fd, void *buf, PRInt32 amount,
						PRIntn flags, PRNetAddr *addr, PRUint32 *addrlen,
											PRIntervalTime timeout);
#define _MD_RECVFROM	_MD_recvfrom
extern PRInt32 _MD_sendto(PRFileDesc *fd, const void *buf, PRInt32 amount,
							PRIntn flags, const PRNetAddr *addr, PRUint32 addrlen,
												PRIntervalTime timeout);
#define _MD_SENDTO	_MD_sendto
extern PRInt32		_MD_writev(PRFileDesc *fd, const struct PRIOVec *iov,
								PRInt32 iov_size, PRIntervalTime timeout);
#define _MD_WRITEV	_MD_writev

extern PRInt32		_MD_socketavailable(PRFileDesc *fd);
#define	_MD_SOCKETAVAILABLE		_MD_socketavailable
extern PRInt64		_MD_socketavailable64(PRFileDesc *fd);
#define	_MD_SOCKETAVAILABLE64		_MD_socketavailable64

#define	_MD_PIPEAVAILABLE		_MD_socketavailable

extern PRInt32 _MD_pr_poll(PRPollDesc *pds, PRIntn npds,
												PRIntervalTime timeout);
#define _MD_PR_POLL		_MD_pr_poll

extern PRInt32		_MD_close(PRInt32 osfd);
#define _MD_CLOSE_FILE	_MD_close
extern PRInt32		_MD_lseek(PRFileDesc*, PRInt32, PRSeekWhence);
#define _MD_LSEEK	_MD_lseek
extern PRInt64		_MD_lseek64(PRFileDesc*, PRInt64, PRSeekWhence);
#define _MD_LSEEK64	_MD_lseek64
extern PRInt32		_MD_fsync(PRFileDesc *fd);
#define _MD_FSYNC	_MD_fsync

extern PRInt32 _MD_socketpair(int af, int type, int flags, PRInt32 *osfd);
#define _MD_SOCKETPAIR		_MD_socketpair

#define _MD_CLOSE_SOCKET	_MD_close

#ifndef NO_NSPR_10_SUPPORT
#define _MD_STAT	stat
#endif

extern PRStatus _MD_getpeername(PRFileDesc *fd, PRNetAddr *addr,
											PRUint32 *addrlen);
#define _MD_GETPEERNAME _MD_getpeername
extern PRStatus _MD_getsockname(PRFileDesc *fd, PRNetAddr *addr,
											PRUint32 *addrlen);
#define _MD_GETSOCKNAME _MD_getsockname

extern PRStatus _MD_getsockopt(PRFileDesc *fd, PRInt32 level,
						PRInt32 optname, char* optval, PRInt32* optlen);
#define _MD_GETSOCKOPT		_MD_getsockopt
extern PRStatus _MD_setsockopt(PRFileDesc *fd, PRInt32 level,
					PRInt32 optname, const char* optval, PRInt32 optlen);
#define _MD_SETSOCKOPT		_MD_setsockopt

extern PRStatus _MD_set_fd_inheritable(PRFileDesc *fd, PRBool inheritable);
#define _MD_SET_FD_INHERITABLE _MD_set_fd_inheritable

extern void _MD_init_fd_inheritable(PRFileDesc *fd, PRBool imported);
#define _MD_INIT_FD_INHERITABLE _MD_init_fd_inheritable

extern void _MD_query_fd_inheritable(PRFileDesc *fd);
#define _MD_QUERY_FD_INHERITABLE _MD_query_fd_inheritable

extern PRStatus _MD_gethostname(char *name, PRUint32 namelen);
#define _MD_GETHOSTNAME		_MD_gethostname

extern PRStatus _MD_getsysinfo(PRSysInfo cmd, char *name, PRUint32 namelen);
#define _MD_GETSYSINFO		_MD_getsysinfo

extern int _MD_unix_get_nonblocking_connect_error(int osfd);

/* Memory-mapped files */

struct _MDFileMap {
    PRIntn prot;
    PRIntn flags;
    PRBool isAnonFM; /* when true, PR_CloseFileMap() must close the related fd */
};

extern PRStatus _MD_CreateFileMap(struct PRFileMap *fmap, PRInt64 size);
#define _MD_CREATE_FILE_MAP _MD_CreateFileMap

#define _MD_GET_MEM_MAP_ALIGNMENT() PR_GetPageSize()

extern void * _MD_MemMap(struct PRFileMap *fmap, PRInt64 offset,
        PRUint32 len);
#define _MD_MEM_MAP _MD_MemMap

extern PRStatus _MD_MemUnmap(void *addr, PRUint32 size);
#define _MD_MEM_UNMAP _MD_MemUnmap

extern PRStatus _MD_CloseFileMap(struct PRFileMap *fmap);
#define _MD_CLOSE_FILE_MAP _MD_CloseFileMap

/*
 * The standard (XPG4) gettimeofday() (from BSD) takes two arguments.
 * On some SVR4 derivatives, gettimeofday() takes only one argument.
 * The GETTIMEOFDAY macro is intended to hide this difference.
 */
#ifdef HAVE_SVID_GETTOD
#define GETTIMEOFDAY(tp) gettimeofday(tp)
#else
#define GETTIMEOFDAY(tp) gettimeofday((tp), NULL)
#endif

#if defined(_PR_PTHREADS) && !defined(_PR_POLL_AVAILABLE)
#define _PR_NEED_FAKE_POLL
#endif

#if defined(_PR_NEED_FAKE_POLL)

/*
 * Some platforms don't have poll(), but our pthreads code calls poll().
 * As a temporary measure, I implemented a fake poll() using select().
 * Here are the struct and macro definitions copied from sys/poll.h
 * on Solaris 2.5.
 */

struct pollfd {
    int fd;
    short events;
    short revents;
};

/* poll events */

#define	POLLIN		0x0001		/* fd is readable */
#define	POLLPRI		0x0002		/* high priority info at fd */
#define	POLLOUT		0x0004		/* fd is writeable (won't block) */
#define	POLLRDNORM	0x0040		/* normal data is readable */
#define	POLLWRNORM	POLLOUT
#define	POLLRDBAND	0x0080		/* out-of-band data is readable */
#define	POLLWRBAND	0x0100		/* out-of-band data is writeable */

#define	POLLNORM	POLLRDNORM

#define	POLLERR		0x0008		/* fd has error condition */
#define	POLLHUP		0x0010		/* fd has been hung up on */
#define	POLLNVAL	0x0020		/* invalid pollfd entry */

extern int poll(struct pollfd *, unsigned long, int);

#endif /* _PR_NEED_FAKE_POLL */

/*
** A vector of the UNIX I/O calls we use. These are here to smooth over
** the rough edges needed for large files. All of NSPR's implmentaions
** go through this vector using syntax of the form
**      result = _md_iovector.xxx64(args);
*/

#if defined(SOLARIS2_5)
/*
** Special case: Solaris 2.5.1
** Solaris starts to have 64-bit file I/O in 2.6.  We build on Solaris
** 2.5.1 so that we can use the same binaries on both Solaris 2.5.1 and
** 2.6.  At run time, we detect whether 64-bit file I/O is available by
** looking up the 64-bit file function symbols in libc.  At build time,
** we need to define the 64-bit file I/O datatypes that are compatible
** with their definitions on Solaris 2.6.
*/
typedef PRInt64 off64_t;
typedef PRUint64 ino64_t;
typedef PRInt64 blkcnt64_t;
struct stat64 {
    dev_t st_dev;
    long st_pad1[3];
    ino64_t st_ino;
    mode_t st_mode;
    nlink_t st_nlink;
    uid_t st_uid;
    gid_t st_gid;
    dev_t st_rdev;
    long t_pad2[2];
    off64_t st_size;
    timestruc_t st_atim;
    timestruc_t st_mtim;
    timestruc_t st_ctim;
    long st_blksize;
    blkcnt64_t st_blocks;
    char st_fstype[_ST_FSTYPSZ];
    long st_pad4[8];
};
typedef struct stat64 _MDStat64;
typedef off64_t _MDOff64_t;

#elif defined(_PR_HAVE_OFF64_T)
typedef struct stat64 _MDStat64;
typedef off64_t _MDOff64_t;
#elif defined(_PR_HAVE_LARGE_OFF_T)
typedef struct stat _MDStat64;
typedef off_t _MDOff64_t;
#elif defined(_PR_NO_LARGE_FILES)
typedef struct stat _MDStat64;
typedef PRInt64 _MDOff64_t;
#else
#error "I don't know yet"
#endif

typedef PRIntn (*_MD_Fstat64)(PRIntn osfd, _MDStat64 *buf);
typedef PRIntn (*_MD_Open64)(const char *path, int oflag, ...);
#if defined(VMS)
typedef PRIntn (*_MD_Stat64)(const char *path, _MDStat64 *buf, ...);
#else
typedef PRIntn (*_MD_Stat64)(const char *path, _MDStat64 *buf);
#endif
typedef _MDOff64_t (*_MD_Lseek64)(PRIntn osfd, _MDOff64_t, PRIntn whence);
typedef void* (*_MD_Mmap64)(
    void *addr, PRSize len, PRIntn prot, PRIntn flags,
    PRIntn fildes, _MDOff64_t offset);
struct _MD_IOVector
{
    _MD_Open64 _open64;
    _MD_Mmap64 _mmap64;
    _MD_Stat64 _stat64;
    _MD_Fstat64 _fstat64;
    _MD_Lseek64 _lseek64;
};
extern struct _MD_IOVector _md_iovector;

#endif /* prunixos_h___ */