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/* Reentrant versions of read 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
	<<_read_r>>---Reentrant version of read
 
INDEX
	_read_r
 
ANSI_SYNOPSIS
	#include <reent.h>
	_ssize_t _read_r(struct _reent *<[ptr]>,
		         int <[fd]>, void *<[buf]>, size_t <[cnt]>);
 
TRAD_SYNOPSIS
	#include <reent.h>
	_ssize_t _read_r(<[ptr]>, <[fd]>, <[buf]>, <[cnt]>)
	struct _reent *<[ptr]>;
	int <[fd]>;
	char *<[buf]>;
	size_t <[cnt]>;
 
DESCRIPTION
	This is a reentrant version of <<read>>.  It
	takes a pointer to the global data block, which holds
	<<errno>>.
*/
 
_ssize_t
_DEFUN (_read_r, (ptr, fd, buf, cnt),
     struct _reent *ptr _AND
     int fd _AND
     _PTR buf _AND
     size_t cnt)
{
  _ssize_t ret;
 
  errno = 0;
  if ((ret = (_ssize_t)_read (fd, buf, cnt)) == -1 && errno != 0)
    ptr->_errno = errno;
  return ret;
}
 
#endif /* ! defined (REENTRANT_SYSCALLS_PROVIDED) */