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/* 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 _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

        <<_lseek_r>>---Reentrant version of lseek

INDEX

        _lseek_r

ANSI_SYNOPSIS

        #include <reent.h>

        off_t _lseek_r(struct _reent *<[ptr]>,

                       int <[fd]>, off_t <[pos]>, int <[whence]>);

TRAD_SYNOPSIS

        #include <reent.h>

        off_t _lseek_r(<[ptr]>, <[fd]>, <[pos]>, <[whence]>)

        struct _reent *<[ptr]>;

        int <[fd]>;

        off_t <[pos]>;

        int <[whence]>;

DESCRIPTION

        This is a reentrant version of <<lseek>>.  It

        takes a pointer to the global data block, which holds

        <<errno>>.

*/

_off_t

_DEFUN (_lseek_r, (ptr, fd, pos, whence),

     struct _reent *ptr _AND

     int fd _AND

     _off_t pos _AND

     int whence)

{

  _off_t ret;

  errno = 0;

  if ((ret = _lseek (fd, pos, whence)) == (_off_t) -1 && errno != 0)

    ptr->_errno = errno;

  return ret;

}

#endif /* ! defined (REENTRANT_SYSCALLS_PROVIDED) */