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/* Reentrant versions of open system call. */

#include <reent.h>

#include <unistd.h>

#include <fcntl.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

        <<_open_r>>---Reentrant version of open

INDEX

        _open_r

ANSI_SYNOPSIS

        #include <reent.h>

        int _open_r(struct _reent *<[ptr]>,

                    const char *<[file]>, int <[flags]>, int <[mode]>);

TRAD_SYNOPSIS

        #include <reent.h>

        int _open_r(<[ptr]>, <[file]>, <[flags]>, <[mode]>)

        struct _reent *<[ptr]>;

        char *<[file]>;

        int <[flags]>;

        int <[mode]>;

DESCRIPTION

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

        takes a pointer to the global data block, which holds

        <<errno>>.

*/

int

_DEFUN (_open_r, (ptr, file, flags, mode),

     struct _reent *ptr _AND

     _CONST char *file _AND

     int flags _AND

     int mode)

{

  int ret;

  errno = 0;

  if ((ret = _open (file, flags, mode)) == -1 && errno != 0)

    ptr->_errno = errno;

  return ret;

}

#endif /* ! defined (REENTRANT_SYSCALLS_PROVIDED) */