source: trunk/libs/newlib/src/newlib/libc/reent/lseek64r.c @ 567

/* Reentrant versions of lseek system call. */

#include <reent.h>
#include <unistd.h>
#include <_syslist.h>

/* Some targets provides their own versions of this functions.  Those
   targets should define REENTRANT_SYSCALLS_PROVIDED in TARGET_CFLAGS.  */

#ifdef __LARGE64_FILES

#ifdef _REENT_ONLY
#ifndef REENTRANT_SYSCALLS_PROVIDED
#define REENTRANT_SYSCALLS_PROVIDED
#endif
#endif

#ifndef REENTRANT_SYSCALLS_PROVIDED

/* We use the errno variable used by the system dependent layer.  */
#undef errno
extern int errno;

/*
FUNCTION
        <<_lseek64_r>>---Reentrant version of lseek
        
INDEX
        _lseek64_r

SYNOPSIS
        #include <reent.h>
        off64_t _lseek64_r(struct _reent *<[ptr]>,
                           int <[fd]>, off64_t <[pos]>, int <[whence]>);

DESCRIPTION
        This is a reentrant version of <<lseek64>>.  It
        takes a pointer to the global data block, which holds
        <<errno>>.  This function only exists on a system
        with large file support.
*/

_off64_t
_lseek64_r (struct _reent *ptr,
     int fd,
     _off64_t pos,
     int whence)
{
  _off64_t ret;

  errno = 0;
  if ((ret = _lseek64 (fd, pos, whence)) == (_off64_t) -1 && errno != 0)
    ptr->_errno = errno;
  return ret;
}

#endif /* ! defined (REENTRANT_SYSCALLS_PROVIDED) */

#endif /* __LARGE64_FILES */