mirror of
https://github.com/freebsd/freebsd-src.git
synced 2024-12-04 12:28:58 +00:00
154 lines
3.1 KiB
C
154 lines
3.1 KiB
C
/*
|
|
* Copyright (c) 2000-2001, 2004 Sendmail, Inc. and its suppliers.
|
|
* All rights reserved.
|
|
* Copyright (c) 1990, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* Chris Torek.
|
|
*
|
|
* By using this file, you agree to the terms and conditions set
|
|
* forth in the LICENSE file which can be found at the top level of
|
|
* the sendmail distribution.
|
|
*/
|
|
|
|
#include <sm/gen.h>
|
|
SM_RCSID("@(#)$Id: fpos.c,v 1.39 2005/06/14 23:07:20 ca Exp $")
|
|
#include <errno.h>
|
|
#include <setjmp.h>
|
|
#include <sm/time.h>
|
|
#include <sm/heap.h>
|
|
#include <sm/signal.h>
|
|
#include <sm/clock.h>
|
|
#include <sm/io.h>
|
|
#include <sm/assert.h>
|
|
#include "local.h"
|
|
|
|
static void tellalrm __P((int));
|
|
static jmp_buf TellTimeOut;
|
|
|
|
/*
|
|
** TELLALRM -- handler when timeout activated for sm_io_tell()
|
|
**
|
|
** Returns flow of control to where setjmp(TellTimeOut) was set.
|
|
**
|
|
** Parameters:
|
|
** sig -- unused
|
|
**
|
|
** Returns:
|
|
** does not return
|
|
**
|
|
** Side Effects:
|
|
** returns flow of control to setjmp(TellTimeOut).
|
|
**
|
|
** NOTE: THIS CAN BE CALLED FROM A SIGNAL HANDLER. DO NOT ADD
|
|
** ANYTHING TO THIS ROUTINE UNLESS YOU KNOW WHAT YOU ARE
|
|
** DOING.
|
|
*/
|
|
|
|
/* ARGSUSED0 */
|
|
static void
|
|
tellalrm(sig)
|
|
int sig;
|
|
{
|
|
longjmp(TellTimeOut, 1);
|
|
}
|
|
|
|
/*
|
|
** SM_IO_TELL -- position the file pointer
|
|
**
|
|
** Paramters:
|
|
** fp -- the file pointer to get repositioned
|
|
** timeout -- time to complete the tell (milliseconds)
|
|
**
|
|
** Returns:
|
|
** Success -- the repositioned location.
|
|
** Failure -- -1 (minus 1) and sets errno
|
|
*/
|
|
|
|
long
|
|
sm_io_tell(fp, timeout)
|
|
register SM_FILE_T *fp;
|
|
int SM_NONVOLATILE timeout;
|
|
{
|
|
register off_t pos;
|
|
SM_EVENT *evt = NULL;
|
|
|
|
SM_REQUIRE_ISA(fp, SmFileMagic);
|
|
if (fp->f_seek == NULL)
|
|
{
|
|
errno = ESPIPE; /* historic practice */
|
|
return -1L;
|
|
}
|
|
|
|
if (timeout == SM_TIME_DEFAULT)
|
|
timeout = fp->f_timeout;
|
|
if (timeout == SM_TIME_IMMEDIATE)
|
|
{
|
|
/*
|
|
** Filling the buffer will take time and we are wanted to
|
|
** return immediately. So...
|
|
*/
|
|
|
|
errno = EAGAIN;
|
|
return -1L;
|
|
}
|
|
|
|
/*
|
|
** Find offset of underlying I/O object, then adjust byte position
|
|
** may adjust seek offset on append stream
|
|
*/
|
|
|
|
(void) sm_flush(fp, (int *) &timeout);
|
|
|
|
/* This is where we start the timeout */
|
|
if (timeout != SM_TIME_FOREVER)
|
|
{
|
|
if (setjmp(TellTimeOut) != 0)
|
|
{
|
|
errno = EAGAIN;
|
|
return -1L;
|
|
}
|
|
|
|
evt = sm_seteventm(timeout, tellalrm, 0);
|
|
}
|
|
|
|
if (fp->f_flags & SMOFF)
|
|
pos = fp->f_lseekoff;
|
|
else
|
|
{
|
|
/* XXX only set the timeout here? */
|
|
pos = (*fp->f_seek)(fp, (off_t) 0, SM_IO_SEEK_CUR);
|
|
if (pos == -1L)
|
|
goto clean;
|
|
}
|
|
if (fp->f_flags & SMRD)
|
|
{
|
|
/*
|
|
** Reading. Any unread characters (including
|
|
** those from ungetc) cause the position to be
|
|
** smaller than that in the underlying object.
|
|
*/
|
|
|
|
pos -= fp->f_r;
|
|
if (HASUB(fp))
|
|
pos -= fp->f_ur;
|
|
}
|
|
else if (fp->f_flags & SMWR && fp->f_p != NULL)
|
|
{
|
|
/*
|
|
** Writing. Any buffered characters cause the
|
|
** position to be greater than that in the
|
|
** underlying object.
|
|
*/
|
|
|
|
pos += fp->f_p - fp->f_bf.smb_base;
|
|
}
|
|
|
|
clean:
|
|
/* We're back. So undo our timeout and handler */
|
|
if (evt != NULL)
|
|
sm_clrevent(evt);
|
|
return pos;
|
|
}
|