docs/htmldocs/using_samba/figs/sam.0201.gif

/* 
   Unix SMB/CIFS implementation.
   Samba system utilities
   Copyright (C) Andrew Tridgell 1992-1998
   Copyright (C) Jeremy Allison  1998-2005
   Copyright (C) Timur Bakeyev        2005
   Copyright (C) Bjoern Jacke    2006-2007

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "includes.h"

#ifdef HAVE_SYS_PRCTL_H
#include <sys/prctl.h>
#endif

/*
   The idea is that this file will eventually have wrappers around all
   important system calls in samba. The aims are:

   - to enable easier porting by putting OS dependent stuff in here

   - to allow for hooks into other "pseudo-filesystems"

   - to allow easier integration of things like the japanese extensions

   - to support the philosophy of Samba to expose the features of
     the OS within the SMB model. In general whatever file/printer/variable
     expansions/etc make sense to the OS should be acceptable to Samba.
*/


/*******************************************************************
 A wrapper for memalign
********************************************************************/

void *sys_memalign( size_t align, size_t size )
{
#if defined(HAVE_POSIX_MEMALIGN)
	void *p = NULL;
	int ret = posix_memalign( &p, align, size );
	if ( ret == 0 )
		return p;

	return NULL;
#elif defined(HAVE_MEMALIGN)
	return memalign( align, size );
#else
	/* On *BSD systems memaligns doesn't exist, but memory will
	 * be aligned on allocations of > pagesize. */
#if defined(SYSCONF_SC_PAGESIZE)
	size_t pagesize = (size_t)sysconf(_SC_PAGESIZE);
#elif defined(HAVE_GETPAGESIZE)
	size_t pagesize = (size_t)getpagesize();
#else
	size_t pagesize = (size_t)-1;
#endif
	if (pagesize == (size_t)-1) {
		DEBUG(0,("memalign functionalaity not available on this platform!\n"));
		return NULL;
	}
	if (size < pagesize) {
		size = pagesize;
	}
	return SMB_MALLOC(size);
#endif
}

/*******************************************************************
 A wrapper for usleep in case we don't have one.
********************************************************************/

int sys_usleep(long usecs)
{
#ifndef HAVE_USLEEP
	struct timeval tval;
#endif

	/*
	 * We need this braindamage as the glibc usleep
	 * is not SPEC1170 complient... grumble... JRA.
	 */

	if(usecs < 0 || usecs > 999999) {
		errno = EINVAL;
		return -1;
	}

#if HAVE_USLEEP
	usleep(usecs);
	return 0;
#else /* HAVE_USLEEP */
	/*
	 * Fake it with select...
	 */
	tval.tv_sec = 0;
	tval.tv_usec = usecs/1000;
	select(0,NULL,NULL,NULL,&tval);
	return 0;
#endif /* HAVE_USLEEP */
}

/*******************************************************************
A read wrapper that will deal with EINTR.
********************************************************************/

ssize_t sys_read(int fd, void *buf, size_t count)
{
	ssize_t ret;

	do {
		ret = read(fd, buf, count);
	} while (ret == -1 && errno == EINTR);
	return ret;
}

/*******************************************************************
A write wrapper that will deal with EINTR.
********************************************************************/

ssize_t sys_write(int fd, const void *buf, size_t count)
{
	ssize_t ret;

	do {
		ret = write(fd, buf, count);
	} while (ret == -1 && errno == EINTR);
	return ret;
}

/*******************************************************************
A writev wrapper that will deal with EINTR.
********************************************************************/

ssize_t sys_writev(int fd, const struct iovec *iov, int iovcnt)
{
	ssize_t ret;

#if 0
	/* Try to confuse write_data_iov a bit */
	if ((random() % 5) == 0) {
		return sys_write(fd, iov[0].iov_base, iov[0].iov_len);
	}
	if (iov[0].iov_len > 1) {
		return sys_write(fd, iov[0].iov_base,
				 (random() % (iov[0].iov_len-1)) + 1);
	}
#endif

	do {
		ret = writev(fd, iov, iovcnt);
	} while (ret == -1 && errno == EINTR);
	return ret;
}

/*******************************************************************
A pread wrapper that will deal with EINTR and 64-bit file offsets.
********************************************************************/

#if defined(HAVE_PREAD) || defined(HAVE_PREAD64)
ssize_t sys_pread(int fd, void *buf, size_t count, SMB_OFF_T off)
{
	ssize_t ret;

	do {
#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_OFF64_T) && defined(HAVE_PREAD64)
		ret = pread64(fd, buf, count, off);
#else
		ret = pread(fd, buf, count, off);
#endif
	} while (ret == -1 && errno == EINTR);
	return ret;
}
#endif

/*******************************************************************
A write wrapper that will deal with EINTR and 64-bit file offsets.
********************************************************************/

#if defined(HAVE_PWRITE) || defined(HAVE_PWRITE64)
ssize_t sys_pwrite(int fd, const void *buf, size_t count, SMB_OFF_T off)
{
	ssize_t ret;

	do {
#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_OFF64_T) && defined(HAVE_PWRITE64)
		ret = pwrite64(fd, buf, count, off);
#else
		ret = pwrite(fd, buf, count, off);
#endif
	} while (ret == -1 && errno == EINTR);
	return ret;
}
#endif

/*******************************************************************
A send wrapper that will deal with EINTR.
********************************************************************/

ssize_t sys_send(int s, const void *msg, size_t len, int flags)
{
	ssize_t ret;

	do {
		ret = send(s, msg, len, flags);
	} while (ret == -1 && errno == EINTR);
	return ret;
}

/*******************************************************************
A sendto wrapper that will deal with EINTR.
********************************************************************/

ssize_t sys_sendto(int s,  const void *msg, size_t len, int flags, const struct sockaddr *to, socklen_t tolen)
{
	ssize_t ret;

	do {
		ret = sendto(s, msg, len, flags, to, tolen);
	} while (ret == -1 && errno == EINTR);
	return ret;
}

/*******************************************************************
A recv wrapper that will deal with EINTR.
********************************************************************/

ssize_t sys_recv(int fd, void *buf, size_t count, int flags)
{
	ssize_t ret;

	do {
		ret = recv(fd, buf, count, flags);
	} while (ret == -1 && errno == EINTR);
	return ret;
}

/*******************************************************************
A recvfrom wrapper that will deal with EINTR.
********************************************************************/

ssize_t sys_recvfrom(int s, void *buf, size_t len, int flags, struct sockaddr *from, socklen_t *fromlen)
{
	ssize_t ret;

	do {
		ret = recvfrom(s, buf, len, flags, from, fromlen);
	} while (ret == -1 && errno == EINTR);
	return ret;
}

/*******************************************************************
A fcntl wrapper that will deal with EINTR.
********************************************************************/

int sys_fcntl_ptr(int fd, int cmd, void *arg)
{
	int ret;

	do {
		ret = fcntl(fd, cmd, arg);
	} while (ret == -1 && errno == EINTR);
	return ret;
}

/*******************************************************************
A fcntl wrapper that will deal with EINTR.
********************************************************************/

int sys_fcntl_long(int fd, int cmd, long arg)
{
	int ret;

	do {
		ret = fcntl(fd, cmd, arg);
	} while (ret == -1 && errno == EINTR);
	return ret;
}

/****************************************************************************
 Get/Set all the possible time fields from a stat struct as a timespec.
****************************************************************************/

static struct timespec get_atimespec(const struct stat *pst)
{
#if !defined(HAVE_STAT_HIRES_TIMESTAMPS)
	struct timespec ret;

	/* Old system - no ns timestamp. */
	ret.tv_sec = pst->st_atime;
	ret.tv_nsec = 0;
	return ret;
#else
#if defined(HAVE_STRUCT_STAT_ST_MTIM_TV_NSEC)
	return pst->st_atim;
#elif defined(HAVE_STRUCT_STAT_ST_MTIMENSEC)
	struct timespec ret;
	ret.tv_sec = pst->st_atime;
	ret.tv_nsec = pst->st_atimensec;
	return ret;
#elif defined(HAVE_STRUCT_STAT_ST_MTIME_N)
	struct timespec ret;
	ret.tv_sec = pst->st_atime;
	ret.tv_nsec = pst->st_atime_n;
	return ret;
#elif defined(HAVE_STRUCT_STAT_ST_UMTIME)
	struct timespec ret;
	ret.tv_sec = pst->st_atime;
	ret.tv_nsec = pst->st_uatime * 1000;
	return ret;
#elif defined(HAVE_STRUCT_STAT_ST_MTIMESPEC_TV_NSEC)
	return pst->st_atimespec;
#else
#error	CONFIGURE_ERROR_IN_DETECTING_TIMESPEC_IN_STAT
#endif
#endif
}

static struct timespec get_mtimespec(const struct stat *pst)
{
#if !defined(HAVE_STAT_HIRES_TIMESTAMPS)
	struct timespec ret;

	/* Old system - no ns timestamp. */
	ret.tv_sec = pst->st_mtime;
	ret.tv_nsec = 0;
	return ret;
#else
#if defined(HAVE_STRUCT_STAT_ST_MTIM_TV_NSEC)
	return pst->st_mtim;
#elif defined(HAVE_STRUCT_STAT_ST_MTIMENSEC)
	struct timespec ret;
	ret.tv_sec = pst->st_mtime;
	ret.tv_nsec = pst->st_mtimensec;
	return ret;
#elif defined(HAVE_STRUCT_STAT_ST_MTIME_N)
	struct timespec ret;
	ret.tv_sec = pst->st_mtime;
	ret.tv_nsec = pst->st_mtime_n;
	return ret;
#elif defined(HAVE_STRUCT_STAT_ST_UMTIME)
	struct timespec ret;
	ret.tv_sec = pst->st_mtime;
	ret.tv_nsec = pst->st_umtime * 1000;
	return ret;
#elif defined(HAVE_STRUCT_STAT_ST_MTIMESPEC_TV_NSEC)
	return pst->st_mtimespec;
#else
#error	CONFIGURE_ERROR_IN_DETECTING_TIMESPEC_IN_STAT
#endif
#endif
}

static struct timespec get_ctimespec(const struct stat *pst)
{
#if !defined(HAVE_STAT_HIRES_TIMESTAMPS)
	struct timespec ret;

	/* Old system - no ns timestamp. */
	ret.tv_sec = pst->st_ctime;
	ret.tv_nsec = 0;
	return ret;
#else
#if defined(HAVE_STRUCT_STAT_ST_MTIM_TV_NSEC)
	return pst->st_ctim;
#elif defined(HAVE_STRUCT_STAT_ST_MTIMENSEC)
	struct timespec ret;
	ret.tv_sec = pst->st_ctime;
	ret.tv_nsec = pst->st_ctimensec;
	return ret;
#elif defined(HAVE_STRUCT_STAT_ST_MTIME_N)
	struct timespec ret;
	ret.tv_sec = pst->st_ctime;
	ret.tv_nsec = pst->st_ctime_n;
	return ret;
#elif defined(HAVE_STRUCT_STAT_ST_UMTIME)
	struct timespec ret;
	ret.tv_sec = pst->st_ctime;
	ret.tv_nsec = pst->st_uctime * 1000;
	return ret;
#elif defined(HAVE_STRUCT_STAT_ST_MTIMESPEC_TV_NSEC)
	return pst->st_ctimespec;
#else
#error	CONFIGURE_ERROR_IN_DETECTING_TIMESPEC_IN_STAT
#endif
#endif
}

/****************************************************************************
 Return the best approximation to a 'create time' under UNIX from a stat
 structure.
****************************************************************************/

static struct timespec calc_create_time_stat(const struct stat *st)
{
	struct timespec ret, ret1;
	struct timespec c_time = get_ctimespec(st);
	struct timespec m_time = get_mtimespec(st);
	struct timespec a_time = get_atimespec(st);

	ret = timespec_compare(&c_time, &m_time) < 0 ? c_time : m_time;
	ret1 = timespec_compare(&ret, &a_time) < 0 ? ret : a_time;

	if(!null_timespec(ret1)) {
		return ret1;
	}

	/*
	 * One of ctime, mtime or atime was zero (probably atime).
	 * Just return MIN(ctime, mtime).
	 */
	return ret;
}

/****************************************************************************
 Return the best approximation to a 'create time' under UNIX from a stat_ex
 structure.
****************************************************************************/

static struct timespec calc_create_time_stat_ex(const struct stat_ex *st)
{
	struct timespec ret, ret1;
	struct timespec c_time = st->st_ex_ctime;
	struct timespec m_time = st->st_ex_mtime;
	struct timespec a_time = st->st_ex_atime;

	ret = timespec_compare(&c_time, &m_time) < 0 ? c_time : m_time;
	ret1 = timespec_compare(&ret, &a_time) < 0 ? ret : a_time;

	if(!null_timespec(ret1)) {
		return ret1;
	}

	/*
	 * One of ctime, mtime or atime was zero (probably atime).
	 * Just return MIN(ctime, mtime).
	 */
	return ret;
}

/****************************************************************************
 Return the 'create time' from a stat struct if it exists (birthtime) or else
 use the best approximation.
****************************************************************************/

static void make_create_timespec(const struct stat *pst, struct stat_ex *dst)
{
	if (S_ISDIR(pst->st_mode) && lp_fake_dir_create_times()) {
		dst->st_ex_btime.tv_sec = 315493200L;          /* 1/1/1980 */
		dst->st_ex_btime.tv_nsec = 0;
	}

	dst->st_ex_calculated_birthtime = false;

#if defined(HAVE_STRUCT_STAT_ST_BIRTHTIMESPEC_TV_NSEC)
	dst->st_ex_btime = pst->st_birthtimespec;
#elif defined(HAVE_STRUCT_STAT_ST_BIRTHTIMENSEC)
	dst->st_ex_btime.tv_sec = pst->st_birthtime;
	dst->st_ex_btime.tv_nsec = pst->st_birthtimenspec;
#elif defined(HAVE_STRUCT_STAT_ST_BIRTHTIME)
	dst->st_ex_btime.tv_sec = pst->st_birthtime;
	dst->st_ex_btime.tv_nsec = 0;
#else
	dst->st_ex_btime = calc_create_time_stat(pst);
	dst->st_ex_calculated_birthtime = true;
#endif

	/* Deal with systems that don't initialize birthtime correctly.
	 * Pointed out by SATOH Fumiyasu <fumiyas@osstech.jp>.
	 */
	if (null_timespec(dst->st_ex_btime)) {
		dst->st_ex_btime = calc_create_time_stat(pst);
		dst->st_ex_calculated_birthtime = true;
	}
}

/****************************************************************************
 If we update a timestamp in a stat_ex struct we may have to recalculate
 the birthtime. For now only implement this for write time, but we may
 also need to do it for atime and ctime. JRA.
****************************************************************************/

void update_stat_ex_mtime(struct stat_ex *dst,
				struct timespec write_ts)
{
	dst->st_ex_mtime = write_ts;

	/* We may have to recalculate btime. */
	if (dst->st_ex_calculated_birthtime) {
		dst->st_ex_btime = calc_create_time_stat_ex(dst);
	}
}

static void init_stat_ex_from_stat (struct stat_ex *dst,
				    const struct stat *src)
{
	dst->st_ex_dev = src->st_dev;
	dst->st_ex_ino = src->st_ino;
	dst->st_ex_mode = src->st_mode;
	dst->st_ex_nlink = src->st_nlink;
	dst->st_ex_uid = src->st_uid;
	dst->st_ex_gid = src->st_gid;
	dst->st_ex_rdev = src->st_rdev;
	dst->st_ex_size = src->st_size;
	dst->st_ex_atime = get_atimespec(src);
	dst->st_ex_mtime = get_mtimespec(src);
	dst->st_ex_ctime = get_ctimespec(src);
	make_create_timespec(src, dst);
	dst->st_ex_blksize = src->st_blksize;
	dst->st_ex_blocks = src->st_blocks;

#ifdef HAVE_STAT_ST_FLAGS
	dst->st_ex_flags = src->st_flags;
#else
	dst->st_ex_flags = 0;
#endif
}

/*******************************************************************
A stat() wrapper that will deal with 64 bit filesizes.
********************************************************************/

int sys_stat(const char *fname,SMB_STRUCT_STAT *sbuf)
{
	int ret;
#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_OFF64_T) && defined(HAVE_STAT64)
	ret = stat64(fname, sbuf);
#else
	struct stat statbuf;
	ret = stat(fname, &statbuf);
#endif
	if (ret == 0) {
		/* we always want directories to appear zero size */
		if (S_ISDIR(statbuf.st_mode)) {
			statbuf.st_size = 0;
		}
		init_stat_ex_from_stat(sbuf, &statbuf);
	}
	return ret;
}

/*******************************************************************
 An fstat() wrapper that will deal with 64 bit filesizes.
********************************************************************/

int sys_fstat(int fd,SMB_STRUCT_STAT *sbuf)
{
	int ret;
#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_OFF64_T) && defined(HAVE_FSTAT64)
	ret = fstat64(fd, sbuf);
#else
	struct stat statbuf;
	ret = fstat(fd, &statbuf);
#endif
	if (ret == 0) {
		/* we always want directories to appear zero size */
		if (S_ISDIR(statbuf.st_mode)) {
			statbuf.st_size = 0;
		}
		init_stat_ex_from_stat(sbuf, &statbuf);
	}
	return ret;
}

/*******************************************************************
 An lstat() wrapper that will deal with 64 bit filesizes.
********************************************************************/

int sys_lstat(const char *fname,SMB_STRUCT_STAT *sbuf)
{
	int ret;
#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_OFF64_T) && defined(HAVE_LSTAT64)
	ret = lstat64(fname, sbuf);
#else
	struct stat statbuf;
	ret = lstat(fname, &statbuf);
#endif
	if (ret == 0) {
		/* we always want directories to appear zero size */
		if (S_ISDIR(statbuf.st_mode)) {
			statbuf.st_size = 0;
		}
		init_stat_ex_from_stat(sbuf, &statbuf);
	}
	return ret;
}

/*******************************************************************
 An ftruncate() wrapper that will deal with 64 bit filesizes.
********************************************************************/

int sys_ftruncate(int fd, SMB_OFF_T offset)
{
#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_OFF64_T) && defined(HAVE_FTRUNCATE64)
	return ftruncate64(fd, offset);
#else
	return ftruncate(fd, offset);
#endif
}

/*******************************************************************
 An lseek() wrapper that will deal with 64 bit filesizes.
********************************************************************/

SMB_OFF_T sys_lseek(int fd, SMB_OFF_T offset, int whence)
{
#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_OFF64_T) && defined(HAVE_LSEEK64)
	return lseek64(fd, offset, whence);
#else
	return lseek(fd, offset, whence);
#endif
}

/*******************************************************************
 An fseek() wrapper that will deal with 64 bit filesizes.
********************************************************************/

int sys_fseek(FILE *fp, SMB_OFF_T offset, int whence)
{
#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(LARGE_SMB_OFF_T) && defined(HAVE_FSEEK64)
	return fseek64(fp, offset, whence);
#elif defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(LARGE_SMB_OFF_T) && defined(HAVE_FSEEKO64)
	return fseeko64(fp, offset, whence);
#else
	return fseek(fp, offset, whence);
#endif
}

/*******************************************************************
 An ftell() wrapper that will deal with 64 bit filesizes.
********************************************************************/

SMB_OFF_T sys_ftell(FILE *fp)
{
#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(LARGE_SMB_OFF_T) && defined(HAVE_FTELL64)
	return (SMB_OFF_T)ftell64(fp);
#elif defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(LARGE_SMB_OFF_T) && defined(HAVE_FTELLO64)
	return (SMB_OFF_T)ftello64(fp);
#else
	return (SMB_OFF_T)ftell(fp);
#endif
}

/*******************************************************************
 A creat() wrapper that will deal with 64 bit filesizes.
********************************************************************/

int sys_creat(const char *path, mode_t mode)
{
#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_CREAT64)
	return creat64(path, mode);
#else
	/*
	 * If creat64 isn't defined then ensure we call a potential open64.
	 * JRA.
	 */
	return sys_open(path, O_WRONLY | O_CREAT | O_TRUNC, mode);
#endif
}

/*******************************************************************
 An open() wrapper that will deal with 64 bit filesizes.
********************************************************************/

int sys_open(const char *path, int oflag, mode_t mode)
{
#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_OPEN64)
	return open64(path, oflag, mode);
#else
	return open(path, oflag, mode);
#endif
}

/*******************************************************************
 An fopen() wrapper that will deal with 64 bit filesizes.
********************************************************************/

FILE *sys_fopen(const char *path, const char *type)
{
#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_FOPEN64)
	return fopen64(path, type);
#else
	return fopen(path, type);
#endif
}


/*******************************************************************
 A flock() wrapper that will perform the kernel flock.
********************************************************************/

void kernel_flock(int fd, uint32 share_mode, uint32 access_mask)
{
#if HAVE_KERNEL_SHARE_MODES
	int kernel_mode = 0;
	if (share_mode == FILE_SHARE_WRITE) {
		kernel_mode = LOCK_MAND|LOCK_WRITE;
	} else if (share_mode == FILE_SHARE_READ) {
		kernel_mode = LOCK_MAND|LOCK_READ;
	} else if (share_mode == FILE_SHARE_NONE) {
		kernel_mode = LOCK_MAND;
	}
	if (kernel_mode) {
		flock(fd, kernel_mode);
	}
#endif
	;
}


/*******************************************************************
 An opendir wrapper that will deal with 64 bit filesizes.
********************************************************************/

SMB_STRUCT_DIR *sys_opendir(const char *name)
{
#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_OPENDIR64)
	return opendir64(name);
#else
	return opendir(name);
#endif
}

/*******************************************************************
 A readdir wrapper that will deal with 64 bit filesizes.
********************************************************************/

SMB_STRUCT_DIRENT *sys_readdir(SMB_STRUCT_DIR *dirp)
{
#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_READDIR64)
	return readdir64(dirp);
#else
	return readdir(dirp);
#endif
}

/*******************************************************************
 A seekdir wrapper that will deal with 64 bit filesizes.
********************************************************************/

void sys_seekdir(SMB_STRUCT_DIR *dirp, long offset)
{
#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_SEEKDIR64)
	seekdir64(dirp, offset);
#else
	seekdir(dirp, offset);
#endif
}

/*******************************************************************
 A telldir wrapper that will deal with 64 bit filesizes.
********************************************************************/

long sys_telldir(SMB_STRUCT_DIR *dirp)
{
#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_TELLDIR64)
	return (long)telldir64(dirp);
#else
	return (long)telldir(dirp);
#endif
}

/*******************************************************************
 A rewinddir wrapper that will deal with 64 bit filesizes.
********************************************************************/

void sys_rewinddir(SMB_STRUCT_DIR *dirp)
{
#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_REWINDDIR64)
	rewinddir64(dirp);
#else
	rewinddir(dirp);
#endif
}

/*******************************************************************
 A close wrapper that will deal with 64 bit filesizes.
********************************************************************/

int sys_closedir(SMB_STRUCT_DIR *dirp)
{
#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_CLOSEDIR64)
	return closedir64(dirp);
#else
	return closedir(dirp);
#endif
}

/*******************************************************************
 An mknod() wrapper that will deal with 64 bit filesizes.
********************************************************************/

int sys_mknod(const char *path, mode_t mode, SMB_DEV_T dev)
{
#if defined(HAVE_MKNOD) || defined(HAVE_MKNOD64)
#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_MKNOD64) && defined(HAVE_DEV64_T)
	return mknod64(path, mode, dev);
#else
	return mknod(path, mode, dev);
#endif
#else
	/* No mknod system call. */
	errno = ENOSYS;
	return -1;
#endif
}

/*******************************************************************
The wait() calls vary between systems
********************************************************************/

int sys_waitpid(pid_t pid,int *status,int options)
{
#ifdef HAVE_WAITPID
	return waitpid(pid,status,options);
#else /* HAVE_WAITPID */
	return wait4(pid, status, options, NULL);
#endif /* HAVE_WAITPID */
}

/*******************************************************************
 System wrapper for getwd
********************************************************************/

char *sys_getwd(char *s)
{
	char *wd;
#ifdef HAVE_GETCWD
	wd = (char *)getcwd(s, PATH_MAX);
#else
	wd = (char *)getwd(s);
#endif
	return wd;
}

#if defined(HAVE_POSIX_CAPABILITIES)

/**************************************************************************
 Try and abstract process capabilities (for systems that have them).
****************************************************************************/

/* Set the POSIX capabilities needed for the given purpose into the effective
 * capability set of the current process. Make sure they are always removed
 * from the inheritable set, because there is no circumstance in which our
 * children should inherit our elevated privileges.
 */
static bool set_process_capability(enum smbd_capability capability,
				   bool enable)
{
	cap_value_t cap_vals[2] = {0};
	int num_cap_vals = 0;

	cap_t cap;

#if defined(HAVE_PRCTL) && defined(PR_GET_KEEPCAPS) && defined(PR_SET_KEEPCAPS)
	/* On Linux, make sure that any capabilities we grab are sticky
	 * across UID changes. We expect that this would allow us to keep both
	 * the effective and permitted capability sets, but as of circa 2.6.16,
	 * only the permitted set is kept. It is a bug (which we work around)
	 * that the effective set is lost, but we still require the effective
	 * set to be kept.
	 */
	if (!prctl(PR_GET_KEEPCAPS)) {
		prctl(PR_SET_KEEPCAPS, 1);
	}
#endif

	cap = cap_get_proc();
	if (cap == NULL) {
		DEBUG(0,("set_process_capability: cap_get_proc failed: %s\n",
			strerror(errno)));
		return False;
	}

	switch (capability) {
		case KERNEL_OPLOCK_CAPABILITY:
#ifdef CAP_NETWORK_MGT
			/* IRIX has CAP_NETWORK_MGT for oplocks. */
			cap_vals[num_cap_vals++] = CAP_NETWORK_MGT;
#endif
			break;
		case DMAPI_ACCESS_CAPABILITY:
#ifdef CAP_DEVICE_MGT
			/* IRIX has CAP_DEVICE_MGT for DMAPI access. */
			cap_vals[num_cap_vals++] = CAP_DEVICE_MGT;
#elif CAP_MKNOD
			/* Linux has CAP_MKNOD for DMAPI access. */
			cap_vals[num_cap_vals++] = CAP_MKNOD;
#endif
			break;
		case LEASE_CAPABILITY:
#ifdef CAP_LEASE
			cap_vals[num_cap_vals++] = CAP_LEASE;
#endif
			break;
	}

	SMB_ASSERT(num_cap_vals <= ARRAY_SIZE(cap_vals));

	if (num_cap_vals == 0) {
		cap_free(cap);
		return True;
	}

	cap_set_flag(cap, CAP_EFFECTIVE, num_cap_vals, cap_vals,
		enable ? CAP_SET : CAP_CLEAR);

	/* We never want to pass capabilities down to our children, so make
	 * sure they are not inherited.
	 */
	cap_set_flag(cap, CAP_INHERITABLE, num_cap_vals, cap_vals, CAP_CLEAR);

	if (cap_set_proc(cap) == -1) {
		DEBUG(0, ("set_process_capability: cap_set_proc failed: %s\n",
			strerror(errno)));
		cap_free(cap);
		return False;
	}

	cap_free(cap);
	return True;
}

#endif /* HAVE_POSIX_CAPABILITIES */

/****************************************************************************
 Gain the oplock capability from the kernel if possible.
****************************************************************************/

void set_effective_capability(enum smbd_capability capability)
{
#if defined(HAVE_POSIX_CAPABILITIES)
	set_process_capability(capability, True);
#endif /* HAVE_POSIX_CAPABILITIES */
}

void drop_effective_capability(enum smbd_capability capability)
{
#if defined(HAVE_POSIX_CAPABILITIES)
	set_process_capability(capability, False);
#endif /* HAVE_POSIX_CAPABILITIES */
}

/**************************************************************************
 Wrapper for random().
****************************************************************************/

long sys_random(void)
{
#if defined(HAVE_RANDOM)
	return (long)random();
#elif defined(HAVE_RAND)
	return (long)rand();
#else
	DEBUG(0,("Error - no random function available !\n"));
	exit(1);
#endif
}

/**************************************************************************
 Wrapper for srandom().
****************************************************************************/

void sys_srandom(unsigned int seed)
{
#if defined(HAVE_SRANDOM)
	srandom(seed);
#elif defined(HAVE_SRAND)
	srand(seed);
#else
	DEBUG(0,("Error - no srandom function available !\n"));
	exit(1);
#endif
}

/**************************************************************************
 Returns equivalent to NGROUPS_MAX - using sysconf if needed.
****************************************************************************/

int groups_max(void)
{
#if defined(SYSCONF_SC_NGROUPS_MAX)
	int ret = sysconf(_SC_NGROUPS_MAX);
	return (ret == -1) ? NGROUPS_MAX : ret;
#else
	return NGROUPS_MAX;
#endif
}

/**************************************************************************
 Wrap setgroups and getgroups for systems that declare getgroups() as
 returning an array of gid_t, but actuall return an array of int.
****************************************************************************/

#if defined(HAVE_BROKEN_GETGROUPS)
static int sys_broken_getgroups(int setlen, gid_t *gidset)
{
	GID_T gid;
	GID_T *group_list;
	int i, ngroups;

	if(setlen == 0) {
		return getgroups(setlen, &gid);
	}

	/*
	 * Broken case. We need to allocate a
	 * GID_T array of size setlen.
	 */

	if(setlen < 0) {
		errno = EINVAL; 
		return -1;
	} 

	if (setlen == 0)
		setlen = groups_max();

	if((group_list = SMB_MALLOC_ARRAY(GID_T, setlen)) == NULL) {
		DEBUG(0,("sys_getgroups: Malloc fail.\n"));
		return -1;
	}

	if((ngroups = getgroups(setlen, group_list)) < 0) {
		int saved_errno = errno;
		SAFE_FREE(group_list);
		errno = saved_errno;
		return -1;
	}

	for(i = 0; i < ngroups; i++)
		gidset[i] = (gid_t)group_list[i];

	SAFE_FREE(group_list);
	return ngroups;
}

static int sys_broken_setgroups(int setlen, gid_t *gidset)
{
	GID_T *group_list;
	int i ; 

	if (setlen == 0)
		return 0 ;

	if (setlen < 0 || setlen > groups_max()) {
		errno = EINVAL; 
		return -1;   
	}

	/*
	 * Broken case. We need to allocate a
	 * GID_T array of size setlen.
	 */

	if((group_list = SMB_MALLOC_ARRAY(GID_T, setlen)) == NULL) {
		DEBUG(0,("sys_setgroups: Malloc fail.\n"));
		return -1;    
	}

	for(i = 0; i < setlen; i++) 
		group_list[i] = (GID_T) gidset[i]; 

	if(setgroups(setlen, group_list) != 0) {
		int saved_errno = errno;
		SAFE_FREE(group_list);
		errno = saved_errno;
		return -1;
	}

	SAFE_FREE(group_list);
	return 0 ;
}

#endif /* HAVE_BROKEN_GETGROUPS */

/* This is a list of systems that require the first GID passed to setgroups(2)
 * to be the effective GID. If your system is one of these, add it here.
 */
#if defined (FREEBSD) || defined (DARWINOS)
#define USE_BSD_SETGROUPS
#endif

#if defined(USE_BSD_SETGROUPS)
/* Depending on the particular BSD implementation, the first GID that is
 * passed to setgroups(2) will either be ignored or will set the credential's
 * effective GID. In either case, the right thing to do is to guarantee that
 * gidset[0] is the effective GID.
 */
static int sys_bsd_setgroups(gid_t primary_gid, int setlen, const gid_t *gidset)
{
	gid_t *new_gidset = NULL;
	int max;
	int ret;

	/* setgroups(2) will fail with EINVAL if we pass too many groups. */
	max = groups_max();

	/* No group list, just make sure we are setting the efective GID. */
	if (setlen == 0) {
		return setgroups(1, &primary_gid);
	}

	/* If the primary gid is not the first array element, grow the array
	 * and insert it at the front.
	 */
	if (gidset[0] != primary_gid) {
	        new_gidset = SMB_MALLOC_ARRAY(gid_t, setlen + 1);
	        if (new_gidset == NULL) {
			return -1;
	        }

		memcpy(new_gidset + 1, gidset, (setlen * sizeof(gid_t)));
		new_gidset[0] = primary_gid;
		setlen++;
	}

	if (setlen > max) {
		DEBUG(3, ("forced to truncate group list from %d to %d\n",
			setlen, max));
		setlen = max;
	}

#if defined(HAVE_BROKEN_GETGROUPS)
	ret = sys_broken_setgroups(setlen, new_gidset ? new_gidset : gidset);
#else
	ret = setgroups(setlen, new_gidset ? new_gidset : gidset);
#endif

	if (new_gidset) {
		int errsav = errno;
		SAFE_FREE(new_gidset);
		errno = errsav;
	}

	return ret;
}

#endif /* USE_BSD_SETGROUPS */

/**************************************************************************
 Wrapper for getgroups. Deals with broken (int) case.
****************************************************************************/

int sys_getgroups(int setlen, gid_t *gidset)
{
#if defined(HAVE_BROKEN_GETGROUPS)
	return sys_broken_getgroups(setlen, gidset);
#else
	return getgroups(setlen, gidset);
#endif
}

/**************************************************************************
 Wrapper for setgroups. Deals with broken (int) case and BSD case.
****************************************************************************/

int sys_setgroups(gid_t UNUSED(primary_gid), int setlen, gid_t *gidset)
{
#if !defined(HAVE_SETGROUPS)
	errno = ENOSYS;
	return -1;
#endif /* HAVE_SETGROUPS */

#if defined(USE_BSD_SETGROUPS)
	return sys_bsd_setgroups(primary_gid, setlen, gidset);
#elif defined(HAVE_BROKEN_GETGROUPS)
	return sys_broken_setgroups(setlen, gidset);
#else
	return setgroups(setlen, gidset);
#endif
}

/**************************************************************************
 Wrappers for setpwent(), getpwent() and endpwent()
****************************************************************************/

void sys_setpwent(void)
{
	setpwent();
}

struct passwd *sys_getpwent(void)
{
	return getpwent();
}

void sys_endpwent(void)
{
	endpwent();
}

/**************************************************************************
 Wrappers for getpwnam(), getpwuid(), getgrnam(), getgrgid()
****************************************************************************/


struct passwd *sys_getpwnam(const char *name)
{
	return getpwnam(name);
}

struct passwd *sys_getpwuid(uid_t uid)
{
	return getpwuid(uid);
}

struct group *sys_getgrnam(const char *name)
{
	return getgrnam(name);
}

struct group *sys_getgrgid(gid_t gid)
{
	return getgrgid(gid);
}

/**************************************************************************
 Extract a command into an arg list.
****************************************************************************/

static char **extract_args(TALLOC_CTX *mem_ctx, const char *command)
{
	char *trunc_cmd;
	char *saveptr;
	char *ptr;
	int argcl;
	char **argl = NULL;
	int i;

	if (!(trunc_cmd = talloc_strdup(mem_ctx, command))) {
		DEBUG(0, ("talloc failed\n"));
		goto nomem;
	}

	if(!(ptr = strtok_r(trunc_cmd, " \t", &saveptr))) {
		TALLOC_FREE(trunc_cmd);
		errno = EINVAL;
		return NULL;
	}

	/*
	 * Count the args.
	 */

	for( argcl = 1; ptr; ptr = strtok_r(NULL, " \t", &saveptr))
		argcl++;

	TALLOC_FREE(trunc_cmd);

	if (!(argl = TALLOC_ARRAY(mem_ctx, char *, argcl + 1))) {
		goto nomem;
	}

	/*
	 * Now do the extraction.
	 */

	if (!(trunc_cmd = talloc_strdup(mem_ctx, command))) {
		goto nomem;
	}

	ptr = strtok_r(trunc_cmd, " \t", &saveptr);
	i = 0;

	if (!(argl[i++] = talloc_strdup(argl, ptr))) {
		goto nomem;
	}

	while((ptr = strtok_r(NULL, " \t", &saveptr)) != NULL) {

		if (!(argl[i++] = talloc_strdup(argl, ptr))) {
			goto nomem;
		}
	}

	argl[i++] = NULL;
	return argl;

 nomem:
	DEBUG(0, ("talloc failed\n"));
	TALLOC_FREE(trunc_cmd);
	TALLOC_FREE(argl);
	errno = ENOMEM;
	return NULL;
}

/**************************************************************************
 Wrapper for popen. Safer as it doesn't search a path.
 Modified from the glibc sources.
 modified by tridge to return a file descriptor. We must kick our FILE* habit
****************************************************************************/

typedef struct _popen_list
{
	int fd;
	pid_t child_pid;
	struct _popen_list *next;
} popen_list;

static popen_list *popen_chain;

int sys_popen(const char *command)
{
	int parent_end, child_end;
	int pipe_fds[2];
	popen_list *entry = NULL;
	char **argl = NULL;

	if (pipe(pipe_fds) < 0)
		return -1;

	parent_end = pipe_fds[0];
	child_end = pipe_fds[1];

	if (!*command) {
		errno = EINVAL;
		goto err_exit;
	}

	if((entry = SMB_MALLOC_P(popen_list)) == NULL)
		goto err_exit;

	ZERO_STRUCTP(entry);

	/*
	 * Extract the command and args into a NULL terminated array.
	 */

	if(!(argl = extract_args(NULL, command)))
		goto err_exit;

	entry->child_pid = sys_fork();

	if (entry->child_pid == -1) {
		goto err_exit;
	}

	if (entry->child_pid == 0) {

		/*
		 * Child !
		 */

		int child_std_end = STDOUT_FILENO;
		popen_list *p;

		close(parent_end);
		if (child_end != child_std_end) {
			dup2 (child_end, child_std_end);
			close (child_end);
		}

		/*
		 * POSIX.2:  "popen() shall ensure that any streams from previous
		 * popen() calls that remain open in the parent process are closed
		 * in the new child process."
		 */

		for (p = popen_chain; p; p = p->next)
			close(p->fd);

		execv(argl[0], argl);
		_exit (127);
	}

	/*
	 * Parent.
	 */

	close (child_end);
	TALLOC_FREE(argl);

	/* Link into popen_chain. */
	entry->next = popen_chain;
	popen_chain = entry;
	entry->fd = parent_end;

	return entry->fd;

err_exit:

	SAFE_FREE(entry);
	SAFE_FREE(argl);
	close(pipe_fds[0]);
	close(pipe_fds[1]);
	return -1;
}

/**************************************************************************
 Wrapper for pclose. Modified from the glibc sources.
****************************************************************************/

int sys_pclose(int fd)
{
	int wstatus;
	popen_list **ptr = &popen_chain;
	popen_list *entry = NULL;
	pid_t wait_pid;
	int status = -1;

	/* Unlink from popen_chain. */
	for ( ; *ptr != NULL; ptr = &(*ptr)->next) {
		if ((*ptr)->fd == fd) {
			entry = *ptr;
			*ptr = (*ptr)->next;
			status = 0;
			break;
		}
	}

	if (status < 0 || close(entry->fd) < 0)
		return -1;

	/*
	 * As Samba is catching and eating child process
	 * exits we don't really care about the child exit
	 * code, a -1 with errno = ECHILD will do fine for us.
	 */

	do {
		wait_pid = sys_waitpid (entry->child_pid, &wstatus, 0);
	} while (wait_pid == -1 && errno == EINTR);

	SAFE_FREE(entry);

	if (wait_pid == -1)
		return -1;
	return wstatus;
}

/**************************************************************************
 Wrapper for Admin Logs.
****************************************************************************/

 void sys_adminlog(int priority, const char *format_str, ...) 
{
	va_list ap;
	int ret;
	char *msgbuf = NULL;

	va_start( ap, format_str );
	ret = vasprintf( &msgbuf, format_str, ap );
	va_end( ap );

	if (ret == -1)
		return;

#if defined(HAVE_SYSLOG)
	syslog( priority, "%s", msgbuf );
#else
	DEBUG(0,("%s", msgbuf ));
#endif
	SAFE_FREE(msgbuf);
}

/******** Solaris EA helper function prototypes ********/
#ifdef HAVE_ATTROPEN
#define SOLARIS_ATTRMODE S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP
static int solaris_write_xattr(int attrfd, const char *value, size_t size);
static ssize_t solaris_read_xattr(int attrfd, void *value, size_t size);
static ssize_t solaris_list_xattr(int attrdirfd, char *list, size_t size);
static int solaris_unlinkat(int attrdirfd, const char *name);
static int solaris_attropen(const char *path, const char *attrpath, int oflag, mode_t mode);
static int solaris_openat(int fildes, const char *path, int oflag, mode_t mode);
#endif

/**************************************************************************
 Wrappers for extented attribute calls. Based on the Linux package with
 support for IRIX and (Net|Free)BSD also. Expand as other systems have them.
****************************************************************************/

ssize_t sys_getxattr (const char *path, const char *name, void *value, size_t size)
{
#if defined(HAVE_GETXATTR)
#ifndef XATTR_ADD_OPT
	return getxattr(path, name, value, size);
#else
	int options = 0;
	return getxattr(path, name, value, size, 0, options);
#endif
#elif defined(HAVE_GETEA)
	return getea(path, name, value, size);
#elif defined(HAVE_EXTATTR_GET_FILE)
	char *s;
	ssize_t retval;
	int attrnamespace = (strncmp(name, "system", 6) == 0) ? 
		EXTATTR_NAMESPACE_SYSTEM : EXTATTR_NAMESPACE_USER;
	const char *attrname = ((s=strchr_m(name, '.')) == NULL) ? name : s + 1;
	/*
	 * The BSD implementation has a nasty habit of silently truncating
	 * the returned value to the size of the buffer, so we have to check
	 * that the buffer is large enough to fit the returned value.
	 */
	if((retval=extattr_get_file(path, attrnamespace, attrname, NULL, 0)) >= 0) {
		if(retval > size) {
			errno = ERANGE;
			return -1;
		}
		if((retval=extattr_get_file(path, attrnamespace, attrname, value, size)) >= 0)
			return retval;
	}

	DEBUG(10,("sys_getxattr: extattr_get_file() failed with: %s\n", strerror(errno)));
	return -1;
#elif defined(HAVE_ATTR_GET)
	int retval, flags = 0;
	int valuelength = (int)size;
	char *attrname = strchr(name,'.') + 1;

	if (strncmp(name, "system", 6) == 0) flags |= ATTR_ROOT;

	retval = attr_get(path, attrname, (char *)value, &valuelength, flags);

	return retval ? retval : valuelength;
#elif defined(HAVE_ATTROPEN)
	ssize_t ret = -1;
	int attrfd = solaris_attropen(path, name, O_RDONLY, 0);
	if (attrfd >= 0) {
		ret = solaris_read_xattr(attrfd, value, size);
		close(attrfd);
	}
	return ret;
#else
	errno = ENOSYS;
	return -1;
#endif
}

ssize_t sys_lgetxattr (const char *path, const char *name, void *value, size_t size)
{
#if defined(HAVE_LGETXATTR)
	return lgetxattr(path, name, value, size);
#elif defined(HAVE_GETXATTR) && defined(XATTR_ADD_OPT)
	int options = XATTR_NOFOLLOW;
	return getxattr(path, name, value, size, 0, options);
#elif defined(HAVE_LGETEA)
	return lgetea(path, name, value, size);
#elif defined(HAVE_EXTATTR_GET_LINK)
	char *s;
	ssize_t retval;
	int attrnamespace = (strncmp(name, "system", 6) == 0) ? 
		EXTATTR_NAMESPACE_SYSTEM : EXTATTR_NAMESPACE_USER;
	const char *attrname = ((s=strchr_m(name, '.')) == NULL) ? name : s + 1;

	if((retval=extattr_get_link(path, attrnamespace, attrname, NULL, 0)) >= 0) {
		if(retval > size) {
			errno = ERANGE;
			return -1;
		}
		if((retval=extattr_get_link(path, attrnamespace, attrname, value, size)) >= 0)
			return retval;
	}

	DEBUG(10,("sys_lgetxattr: extattr_get_link() failed with: %s\n", strerror(errno)));
	return -1;
#elif defined(HAVE_ATTR_GET)
	int retval, flags = ATTR_DONTFOLLOW;
	int valuelength = (int)size;
	char *attrname = strchr(name,'.') + 1;

	if (strncmp(name, "system", 6) == 0) flags |= ATTR_ROOT;

	retval = attr_get(path, attrname, (char *)value, &valuelength, flags);

	return retval ? retval : valuelength;
#elif defined(HAVE_ATTROPEN)
	ssize_t ret = -1;
	int attrfd = solaris_attropen(path, name, O_RDONLY|AT_SYMLINK_NOFOLLOW, 0);
	if (attrfd >= 0) {
		ret = solaris_read_xattr(attrfd, value, size);
		close(attrfd);
	}
	return ret;
#else
	errno = ENOSYS;
	return -1;
#endif
}

ssize_t sys_fgetxattr (int filedes, const char *name, void *value, size_t size)
{
#if defined(HAVE_FGETXATTR)
#ifndef XATTR_ADD_OPT
	return fgetxattr(filedes, name, value, size);
#else
	int options = 0;
	return fgetxattr(filedes, name, value, size, 0, options);
#endif
#elif defined(HAVE_FGETEA)
	return fgetea(filedes, name, value, size);
#elif defined(HAVE_EXTATTR_GET_FD)
	char *s;
	ssize_t retval;
	int attrnamespace = (strncmp(name, "system", 6) == 0) ? 
		EXTATTR_NAMESPACE_SYSTEM : EXTATTR_NAMESPACE_USER;
	const char *attrname = ((s=strchr_m(name, '.')) == NULL) ? name : s + 1;

	if((retval=extattr_get_fd(filedes, attrnamespace, attrname, NULL, 0)) >= 0) {
		if(retval > size) {
			errno = ERANGE;
			return -1;
		}
		if((retval=extattr_get_fd(filedes, attrnamespace, attrname, value, size)) >= 0)
			return retval;
	}

	DEBUG(10,("sys_fgetxattr: extattr_get_fd() failed with: %s\n", strerror(errno)));
	return -1;
#elif defined(HAVE_ATTR_GETF)
	int retval, flags = 0;
	int valuelength = (int)size;
	char *attrname = strchr(name,'.') + 1;

	if (strncmp(name, "system", 6) == 0) flags |= ATTR_ROOT;

	retval = attr_getf(filedes, attrname, (char *)value, &valuelength, flags);

	return retval ? retval : valuelength;
#elif defined(HAVE_ATTROPEN)
	ssize_t ret = -1;
	int attrfd = solaris_openat(filedes, name, O_RDONLY|O_XATTR, 0);
	if (attrfd >= 0) {
		ret = solaris_read_xattr(attrfd, value, size);
		close(attrfd);
	}
	return ret;
#else
	errno = ENOSYS;
	return -1;
#endif
}

#if defined(HAVE_EXTATTR_LIST_FILE)

#define EXTATTR_PREFIX(s)	(s), (sizeof((s))-1)

static struct {
        int space;
	const char *name;
	size_t len;
} 
extattr[] = {
	{ EXTATTR_NAMESPACE_SYSTEM, EXTATTR_PREFIX("system.") },
        { EXTATTR_NAMESPACE_USER, EXTATTR_PREFIX("user.") },
};

typedef union {
	const char *path;
	int filedes;
} extattr_arg;

static ssize_t bsd_attr_list (int type, extattr_arg arg, char *list, size_t size)
{
	ssize_t list_size, total_size = 0;
	int i, t, len;
	char *buf;
	/* Iterate through extattr(2) namespaces */
	for(t = 0; t < (sizeof(extattr)/sizeof(extattr[0])); t++) {
		switch(type) {
#if defined(HAVE_EXTATTR_LIST_FILE)
			case 0:
				list_size = extattr_list_file(arg.path, extattr[t].space, list, size);
				break;
#endif
#if defined(HAVE_EXTATTR_LIST_LINK)
			case 1:
				list_size = extattr_list_link(arg.path, extattr[t].space, list, size);
				break;
#endif
#if defined(HAVE_EXTATTR_LIST_FD)
			case 2:
				list_size = extattr_list_fd(arg.filedes, extattr[t].space, list, size);
				break;
#endif
			default:
				errno = ENOSYS;
				return -1;
		}
		/* Some error happend. Errno should be set by the previous call */
		if(list_size < 0)
			return -1;
		/* No attributes */
		if(list_size == 0)
			continue;
		/* XXX: Call with an empty buffer may be used to calculate
		   necessary buffer size. Unfortunately, we can't say, how
		   many attributes were returned, so here is the potential
		   problem with the emulation.
		*/
		if(list == NULL) {
			/* Take the worse case of one char attribute names - 
			   two bytes per name plus one more for sanity.
			*/
			total_size += list_size + (list_size/2 + 1)*extattr[t].len;
			continue;
		}
		/* Count necessary offset to fit namespace prefixes */
		len = 0;
		for(i = 0; i < list_size; i += list[i] + 1)
			len += extattr[t].len;

		total_size += list_size + len;
		/* Buffer is too small to fit the results */
		if(total_size > size) {
			errno = ERANGE;
			return -1;
		}
		/* Shift results back, so we can prepend prefixes */
		buf = memmove(list + len, list, list_size);

		for(i = 0; i < list_size; i += len + 1) {
			len = buf[i];
			strncpy(list, extattr[t].name, extattr[t].len + 1);
			list += extattr[t].len;
			strncpy(list, buf + i + 1, len);
			list[len] = '\0';
			list += len + 1;
		}
		size -= total_size;
	}
	return total_size;
}

#endif

#if defined(HAVE_ATTR_LIST) && defined(HAVE_SYS_ATTRIBUTES_H)
static char attr_buffer[ATTR_MAX_VALUELEN];

static ssize_t irix_attr_list(const char *path, int filedes, char *list, size_t size, int flags)
{
	int retval = 0, index;
	attrlist_cursor_t *cursor = 0;
	int total_size = 0;
	attrlist_t * al = (attrlist_t *)attr_buffer;
	attrlist_ent_t *ae;
	size_t ent_size, left = size;
	char *bp = list;

	while (True) {
	    if (filedes)
		retval = attr_listf(filedes, attr_buffer, ATTR_MAX_VALUELEN, flags, cursor);
	    else
		retval = attr_list(path, attr_buffer, ATTR_MAX_VALUELEN, flags, cursor);
	    if (retval) break;
	    for (index = 0; index < al->al_count; index++) {
		ae = ATTR_ENTRY(attr_buffer, index);
		ent_size = strlen(ae->a_name) + sizeof("user.");
		if (left >= ent_size) {
		    strncpy(bp, "user.", sizeof("user."));
		    strncat(bp, ae->a_name, ent_size - sizeof("user."));
		    bp += ent_size;
		    left -= ent_size;
		} else if (size) {
		    errno = ERANGE;
		    retval = -1;
		    break;
		}
		total_size += ent_size;
	    }
	    if (al->al_more == 0) break;
	}
	if (retval == 0) {
	    flags |= ATTR_ROOT;
	    cursor = 0;
	    while (True) {
		if (filedes)
		    retval = attr_listf(filedes, attr_buffer, ATTR_MAX_VALUELEN, flags, cursor);
		else
		    retval = attr_list(path, attr_buffer, ATTR_MAX_VALUELEN, flags, cursor);
		if (retval) break;
		for (index = 0; index < al->al_count; index++) {
		    ae = ATTR_ENTRY(attr_buffer, index);
		    ent_size = strlen(ae->a_name) + sizeof("system.");
		    if (left >= ent_size) {
			strncpy(bp, "system.", sizeof("system."));
			strncat(bp, ae->a_name, ent_size - sizeof("system."));
			bp += ent_size;
			left -= ent_size;
		    } else if (size) {
			errno = ERANGE;
			retval = -1;
			break;
		    }
		    total_size += ent_size;
		}
		if (al->al_more == 0) break;
	    }
	}
	return (ssize_t)(retval ? retval : total_size);
}

#endif

ssize_t sys_listxattr (const char *path, char *list, size_t size)
{
#if defined(HAVE_LISTXATTR)
#ifndef XATTR_ADD_OPT
	return listxattr(path, list, size);
#else
	int options = 0;
	return listxattr(path, list, size, options);
#endif
#elif defined(HAVE_LISTEA)
	return listea(path, list, size);
#elif defined(HAVE_EXTATTR_LIST_FILE)
	extattr_arg arg;
	arg.path = path;
	return bsd_attr_list(0, arg, list, size);
#elif defined(HAVE_ATTR_LIST) && defined(HAVE_SYS_ATTRIBUTES_H)
	return irix_attr_list(path, 0, list, size, 0);
#elif defined(HAVE_ATTROPEN)
	ssize_t ret = -1;
	int attrdirfd = solaris_attropen(path, ".", O_RDONLY, 0);
	if (attrdirfd >= 0) {
		ret = solaris_list_xattr(attrdirfd, list, size);
		close(attrdirfd);
	}
	return ret;
#else
	errno = ENOSYS;
	return -1;
#endif
}

ssize_t sys_llistxattr (const char *path, char *list, size_t size)
{
#if defined(HAVE_LLISTXATTR)
	return llistxattr(path, list, size);
#elif defined(HAVE_LISTXATTR) && defined(XATTR_ADD_OPT)
	int options = XATTR_NOFOLLOW;
	return listxattr(path, list, size, options);
#elif defined(HAVE_LLISTEA)
	return llistea(path, list, size);
#elif defined(HAVE_EXTATTR_LIST_LINK)
	extattr_arg arg;
	arg.path = path;
	return bsd_attr_list(1, arg, list, size);
#elif defined(HAVE_ATTR_LIST) && defined(HAVE_SYS_ATTRIBUTES_H)
	return irix_attr_list(path, 0, list, size, ATTR_DONTFOLLOW);
#elif defined(HAVE_ATTROPEN)
	ssize_t ret = -1;
	int attrdirfd = solaris_attropen(path, ".", O_RDONLY|AT_SYMLINK_NOFOLLOW, 0);
	if (attrdirfd >= 0) {
		ret = solaris_list_xattr(attrdirfd, list, size);
		close(attrdirfd);
	}
	return ret;
#else
	errno = ENOSYS;
	return -1;
#endif
}

ssize_t sys_flistxattr (int filedes, char *list, size_t size)
{
#if defined(HAVE_FLISTXATTR)
#ifndef XATTR_ADD_OPT
	return flistxattr(filedes, list, size);
#else
	int options = 0;
	return flistxattr(filedes, list, size, options);
#endif
#elif defined(HAVE_FLISTEA)
	return flistea(filedes, list, size);
#elif defined(HAVE_EXTATTR_LIST_FD)
	extattr_arg arg;
	arg.filedes = filedes;
	return bsd_attr_list(2, arg, list, size);
#elif defined(HAVE_ATTR_LISTF)
	return irix_attr_list(NULL, filedes, list, size, 0);
#elif defined(HAVE_ATTROPEN)
	ssize_t ret = -1;
	int attrdirfd = solaris_openat(filedes, ".", O_RDONLY|O_XATTR, 0);
	if (attrdirfd >= 0) {
		ret = solaris_list_xattr(attrdirfd, list, size);
		close(attrdirfd);
	}
	return ret;
#else
	errno = ENOSYS;
	return -1;
#endif
}

int sys_removexattr (const char *path, const char *name)
{
#if defined(HAVE_REMOVEXATTR)
#ifndef XATTR_ADD_OPT
	return removexattr(path, name);
#else
	int options = 0;
	return removexattr(path, name, options);
#endif
#elif defined(HAVE_REMOVEEA)
	return removeea(path, name);
#elif defined(HAVE_EXTATTR_DELETE_FILE)
	char *s;
	int attrnamespace = (strncmp(name, "system", 6) == 0) ? 
		EXTATTR_NAMESPACE_SYSTEM : EXTATTR_NAMESPACE_USER;
	const char *attrname = ((s=strchr_m(name, '.')) == NULL) ? name : s + 1;

	return extattr_delete_file(path, attrnamespace, attrname);
#elif defined(HAVE_ATTR_REMOVE)
	int flags = 0;
	char *attrname = strchr(name,'.') + 1;

	if (strncmp(name, "system", 6) == 0) flags |= ATTR_ROOT;

	return attr_remove(path, attrname, flags);
#elif defined(HAVE_ATTROPEN)
	int ret = -1;
	int attrdirfd = solaris_attropen(path, ".", O_RDONLY, 0);
	if (attrdirfd >= 0) {
		ret = solaris_unlinkat(attrdirfd, name);
		close(attrdirfd);
	}
	return ret;
#else
	errno = ENOSYS;
	return -1;
#endif
}

int sys_lremovexattr (const char *path, const char *name)
{
#if defined(HAVE_LREMOVEXATTR)
	return lremovexattr(path, name);
#elif defined(HAVE_REMOVEXATTR) && defined(XATTR_ADD_OPT)
	int options = XATTR_NOFOLLOW;
	return removexattr(path, name, options);
#elif defined(HAVE_LREMOVEEA)
	return lremoveea(path, name);
#elif defined(HAVE_EXTATTR_DELETE_LINK)
	char *s;
	int attrnamespace = (strncmp(name, "system", 6) == 0) ? 
		EXTATTR_NAMESPACE_SYSTEM : EXTATTR_NAMESPACE_USER;
	const char *attrname = ((s=strchr_m(name, '.')) == NULL) ? name : s + 1;

	return extattr_delete_link(path, attrnamespace, attrname);
#elif defined(HAVE_ATTR_REMOVE)
	int flags = ATTR_DONTFOLLOW;
	char *attrname = strchr(name,'.') + 1;

	if (strncmp(name, "system", 6) == 0) flags |= ATTR_ROOT;

	return attr_remove(path, attrname, flags);
#elif defined(HAVE_ATTROPEN)
	int ret = -1;
	int attrdirfd = solaris_attropen(path, ".", O_RDONLY|AT_SYMLINK_NOFOLLOW, 0);
	if (attrdirfd >= 0) {
		ret = solaris_unlinkat(attrdirfd, name);
		close(attrdirfd);
	}
	return ret;
#else
	errno = ENOSYS;
	return -1;
#endif
}

int sys_fremovexattr (int filedes, const char *name)
{
#if defined(HAVE_FREMOVEXATTR)
#ifndef XATTR_ADD_OPT
	return fremovexattr(filedes, name);
#else
	int options = 0;
	return fremovexattr(filedes, name, options);
#endif
#elif defined(HAVE_FREMOVEEA)
	return fremoveea(filedes, name);
#elif defined(HAVE_EXTATTR_DELETE_FD)
	char *s;
	int attrnamespace = (strncmp(name, "system", 6) == 0) ? 
		EXTATTR_NAMESPACE_SYSTEM : EXTATTR_NAMESPACE_USER;
	const char *attrname = ((s=strchr_m(name, '.')) == NULL) ? name : s + 1;

	return extattr_delete_fd(filedes, attrnamespace, attrname);
#elif defined(HAVE_ATTR_REMOVEF)
	int flags = 0;
	char *attrname = strchr(name,'.') + 1;

	if (strncmp(name, "system", 6) == 0) flags |= ATTR_ROOT;

	return attr_removef(filedes, attrname, flags);
#elif defined(HAVE_ATTROPEN)
	int ret = -1;
	int attrdirfd = solaris_openat(filedes, ".", O_RDONLY|O_XATTR, 0);
	if (attrdirfd >= 0) {
		ret = solaris_unlinkat(attrdirfd, name);
		close(attrdirfd);
	}
	return ret;
#else
	errno = ENOSYS;
	return -1;
#endif
}

int sys_setxattr (const char *path, const char *name, const void *value, size_t size, int flags)
{
#if defined(HAVE_SETXATTR)
#ifndef XATTR_ADD_OPT
	return setxattr(path, name, value, size, flags);
#else
	int options = 0;
	return setxattr(path, name, value, size, 0, options);
#endif
#elif defined(HAVE_SETEA)
	return setea(path, name, value, size, flags);
#elif defined(HAVE_EXTATTR_SET_FILE)
	char *s;
	int retval = 0;
	int attrnamespace = (strncmp(name, "system", 6) == 0) ? 
		EXTATTR_NAMESPACE_SYSTEM : EXTATTR_NAMESPACE_USER;
	const char *attrname = ((s=strchr_m(name, '.')) == NULL) ? name : s + 1;
	if (flags) {
		/* Check attribute existence */
		retval = extattr_get_file(path, attrnamespace, attrname, NULL, 0);
		if (retval < 0) {
			/* REPLACE attribute, that doesn't exist */
			if (flags & XATTR_REPLACE && errno == ENOATTR) {
				errno = ENOATTR;
				return -1;
			}
			/* Ignore other errors */
		}
		else {
			/* CREATE attribute, that already exists */
			if (flags & XATTR_CREATE) {
				errno = EEXIST;
				return -1;
			}
		}
	}
	retval = extattr_set_file(path, attrnamespace, attrname, value, size);
	return (retval < 0) ? -1 : 0;
#elif defined(HAVE_ATTR_SET)
	int myflags = 0;
	char *attrname = strchr(name,'.') + 1;

	if (strncmp(name, "system", 6) == 0) myflags |= ATTR_ROOT;
	if (flags & XATTR_CREATE) myflags |= ATTR_CREATE;
	if (flags & XATTR_REPLACE) myflags |= ATTR_REPLACE;

	return attr_set(path, attrname, (const char *)value, size, myflags);
#elif defined(HAVE_ATTROPEN)
	int ret = -1;
	int myflags = O_RDWR;
	int attrfd;
	if (flags & XATTR_CREATE) myflags |= O_EXCL;
	if (!(flags & XATTR_REPLACE)) myflags |= O_CREAT;
	attrfd = solaris_attropen(path, name, myflags, (mode_t) SOLARIS_ATTRMODE);
	if (attrfd >= 0) {
		ret = solaris_write_xattr(attrfd, value, size);
		close(attrfd);
	}
	return ret;
#else
	errno = ENOSYS;
	return -1;
#endif
}