119 lines
2.5 KiB
C
119 lines
2.5 KiB
C
/*
|
|
FUNCTION
|
|
<<fdopen64>>---turn open large file into a stream
|
|
|
|
INDEX
|
|
fdopen64
|
|
INDEX
|
|
_fdopen64_r
|
|
|
|
SYNOPSIS
|
|
#include <stdio.h>
|
|
FILE *fdopen64(int <[fd]>, const char *<[mode]>);
|
|
FILE *_fdopen64_r(void *<[reent]>,
|
|
int <[fd]>, const char *<[mode]>);
|
|
|
|
DESCRIPTION
|
|
<<fdopen64>> produces a file descriptor of type <<FILE *>>, from a
|
|
descriptor for an already-open file (returned, for example, by the
|
|
system subroutine <<open>> rather than by <<fopen>>).
|
|
The <[mode]> argument has the same meanings as in <<fopen>>.
|
|
|
|
RETURNS
|
|
File pointer or <<NULL>>, as for <<fopen>>.
|
|
*/
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/fcntl.h>
|
|
|
|
#include <stdio.h>
|
|
#include <errno.h>
|
|
#include "local.h"
|
|
#include <_syslist.h>
|
|
#include <sys/lock.h>
|
|
|
|
extern int __sflags ();
|
|
|
|
FILE *
|
|
_DEFUN (_fdopen64_r, (ptr, fd, mode),
|
|
struct _reent *ptr _AND
|
|
int fd _AND
|
|
_CONST char *mode)
|
|
{
|
|
register FILE *fp;
|
|
int flags, oflags;
|
|
#ifdef HAVE_FCNTL
|
|
int fdflags, fdmode;
|
|
#endif
|
|
|
|
if ((flags = __sflags (ptr, mode, &oflags)) == 0)
|
|
return 0;
|
|
|
|
/* make sure the mode the user wants is a subset of the actual mode */
|
|
#ifdef HAVE_FCNTL
|
|
if ((fdflags = _fcntl_r (ptr, fd, F_GETFL, 0)) < 0)
|
|
return 0;
|
|
fdmode = fdflags & O_ACCMODE;
|
|
if (fdmode != O_RDWR && (fdmode != (oflags & O_ACCMODE)))
|
|
{
|
|
ptr->_errno = EBADF;
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
if ((fp = __sfp (ptr)) == 0)
|
|
return 0;
|
|
|
|
_newlib_flockfile_start(fp);
|
|
|
|
fp->_flags = flags;
|
|
/* POSIX recommends setting the O_APPEND bit on fd to match append
|
|
streams. Someone may later clear O_APPEND on fileno(fp), but the
|
|
stream must still remain in append mode. Rely on __sflags
|
|
setting __SAPP properly. */
|
|
#ifdef HAVE_FCNTL
|
|
if ((oflags & O_APPEND) && !(fdflags & O_APPEND))
|
|
_fcntl_r (ptr, fd, F_SETFL, fdflags | O_APPEND);
|
|
#endif
|
|
fp->_file = fd;
|
|
fp->_cookie = (_PTR) fp;
|
|
|
|
#undef _read
|
|
#undef _write
|
|
#undef _seek
|
|
#undef _close
|
|
|
|
fp->_read = __sread;
|
|
fp->_write = __swrite64;
|
|
fp->_seek = __sseek;
|
|
fp->_seek64 = __sseek64;
|
|
fp->_close = __sclose;
|
|
|
|
#ifdef __SCLE
|
|
/* Explicit given mode results in explicit setting mode on fd */
|
|
if (oflags & O_BINARY)
|
|
setmode(fp->_file, O_BINARY);
|
|
else if (oflags & O_TEXT)
|
|
setmode(fp->_file, O_TEXT);
|
|
if (__stextmode(fp->_file))
|
|
fp->_flags |= __SCLE;
|
|
#endif
|
|
|
|
fp->_flags |= __SL64;
|
|
|
|
_newlib_flockfile_end(fp);
|
|
return fp;
|
|
}
|
|
|
|
#ifndef _REENT_ONLY
|
|
|
|
FILE *
|
|
_DEFUN (fdopen64, (fd, mode),
|
|
int fd _AND
|
|
_CONST char *mode)
|
|
{
|
|
return _fdopen64_r (_REENT, fd, mode);
|
|
}
|
|
|
|
#endif
|