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