You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
95 lines
3.5 KiB
95 lines
3.5 KiB
/*
|
|
* Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
|
|
* Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
|
|
* Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
|
|
* Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
|
|
* Copyright (c) 2002-2005 Roland McGrath <roland@redhat.com>
|
|
* Copyright (c) 2009 Andreas Schwab <schwab@redhat.com>
|
|
* Copyright (c) 2012 H.J. Lu <hongjiu.lu@intel.com>
|
|
* Copyright (c) 2013 Denys Vlasenko <vda.linux@googlemail.com>
|
|
* Copyright (c) 2014-2016 Dmitry V. Levin <ldv@altlinux.org>
|
|
* Copyright (c) 2014-2018 The strace developers.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. The name of the author may not be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include "defs.h"
|
|
|
|
#include "xlat/whence_codes.h"
|
|
|
|
/* Linux kernel has exactly one version of lseek:
|
|
* fs/read_write.c::SYSCALL_DEFINE3(lseek, unsigned, fd, off_t, offset, unsigned, origin)
|
|
* In kernel, off_t is always the same as (kernel's) long
|
|
* (see include/uapi/asm-generic/posix_types.h).
|
|
* Use test/x32_lseek.c to test lseek decoding.
|
|
*/
|
|
SYS_FUNC(lseek)
|
|
{
|
|
printfd(tcp, tcp->u_arg[0]);
|
|
|
|
kernel_long_t offset;
|
|
|
|
# ifndef current_klongsize
|
|
if (current_klongsize < sizeof(kernel_long_t)) {
|
|
offset = (int) tcp->u_arg[1];
|
|
} else
|
|
# endif /* !current_klongsize */
|
|
{
|
|
offset = tcp->u_arg[1];
|
|
}
|
|
|
|
tprintf(", %" PRI_kld ", ", offset);
|
|
|
|
printxval(whence_codes, tcp->u_arg[2], "SEEK_???");
|
|
|
|
return RVAL_DECODED;
|
|
}
|
|
|
|
/* llseek syscall takes explicitly two ulong arguments hi, lo,
|
|
* rather than one 64-bit argument for which ULONG_LONG works
|
|
* appropriate for the native byte order.
|
|
*
|
|
* See kernel's fs/read_write.c::SYSCALL_DEFINE5(llseek, ...)
|
|
*
|
|
* hi,lo are "unsigned longs" and combined exactly this way in kernel:
|
|
* ((loff_t) hi << 32) | lo
|
|
* Note that for architectures with kernel's long wider than userspace long
|
|
* (such as x32), combining code will use *kernel's*, i.e. *wide* longs
|
|
* for hi and lo.
|
|
*/
|
|
SYS_FUNC(llseek)
|
|
{
|
|
if (entering(tcp)) {
|
|
printfd(tcp, tcp->u_arg[0]);
|
|
tprintf(", %lld, ",
|
|
((long long) tcp->u_arg[1] << 32)
|
|
| ((long long) tcp->u_arg[2]));
|
|
} else {
|
|
printnum_int64(tcp, tcp->u_arg[3], "%" PRIu64);
|
|
tprints(", ");
|
|
printxval(whence_codes, tcp->u_arg[4], "SEEK_???");
|
|
}
|
|
return 0;
|
|
}
|