source: trunk/libs/newlib/src/newlib/libc/reent/fcntlr.c

/* Reentrant versions of fcntl system call.  This implementation just
   calls the fcntl system call.  */

#include <reent.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <_syslist.h>

/* Some targets provides their own versions of these 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
        <<_fcntl_r>>---Reentrant version of fcntl
        
INDEX
        _fcntl_r

SYNOPSIS
        #include <reent.h>
        int _fcntl_r(struct _reent *<[ptr]>,
                     int <[fd]>, int <[cmd]>, <[arg]>);

DESCRIPTION
        This is a reentrant version of <<fcntl>>.  It
        takes a pointer to the global data block, which holds
        <<errno>>.
*/

int
_fcntl_r (struct _reent *ptr,
     int fd,
     int cmd,
     int arg)
{
  int ret;

  errno = 0;
  if ((ret = _fcntl (fd, cmd, arg)) == -1 && errno != 0)
    ptr->_errno = errno;
  return ret;
}

#endif /* ! defined (REENTRANT_SYSCALLS_PROVIDED) */