Dmitry V. Levin
b93d52fe3d
strace is now provided under the terms of the GNU Lesser General Public License version 2.1 or later, see COPYING for more details. strace test suite is now provided under the terms of the GNU General Public License version 2 or later, see tests/COPYING for more details.
75 lines
2.2 KiB
C
75 lines
2.2 KiB
C
/*
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* Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
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* Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
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* Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
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* Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
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* Copyright (c) 2002-2005 Roland McGrath <roland@redhat.com>
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* Copyright (c) 2009 Andreas Schwab <schwab@redhat.com>
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* Copyright (c) 2012 H.J. Lu <hongjiu.lu@intel.com>
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* Copyright (c) 2013 Denys Vlasenko <vda.linux@googlemail.com>
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* Copyright (c) 2014-2016 Dmitry V. Levin <ldv@altlinux.org>
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* Copyright (c) 2014-2018 The strace developers.
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* All rights reserved.
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*
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* SPDX-License-Identifier: LGPL-2.1-or-later
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*/
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#include "defs.h"
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#include "xlat/whence_codes.h"
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/* Linux kernel has exactly one version of lseek:
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* fs/read_write.c::SYSCALL_DEFINE3(lseek, unsigned, fd, off_t, offset, unsigned, origin)
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* In kernel, off_t is always the same as (kernel's) long
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* (see include/uapi/asm-generic/posix_types.h).
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* Use test/x32_lseek.c to test lseek decoding.
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*/
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SYS_FUNC(lseek)
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{
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printfd(tcp, tcp->u_arg[0]);
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kernel_long_t offset;
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# ifndef current_klongsize
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if (current_klongsize < sizeof(kernel_long_t)) {
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offset = (int) tcp->u_arg[1];
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} else
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# endif /* !current_klongsize */
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{
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offset = tcp->u_arg[1];
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}
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tprintf(", %" PRI_kld ", ", offset);
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printxval(whence_codes, tcp->u_arg[2], "SEEK_???");
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return RVAL_DECODED;
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}
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/* llseek syscall takes explicitly two ulong arguments hi, lo,
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* rather than one 64-bit argument for which ULONG_LONG works
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* appropriate for the native byte order.
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*
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* See kernel's fs/read_write.c::SYSCALL_DEFINE5(llseek, ...)
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*
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* hi,lo are "unsigned longs" and combined exactly this way in kernel:
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* ((loff_t) hi << 32) | lo
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* Note that for architectures with kernel's long wider than userspace long
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* (such as x32), combining code will use *kernel's*, i.e. *wide* longs
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* for hi and lo.
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*/
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SYS_FUNC(llseek)
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{
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if (entering(tcp)) {
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printfd(tcp, tcp->u_arg[0]);
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tprintf(", %lld, ",
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((long long) tcp->u_arg[1] << 32)
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| ((long long) tcp->u_arg[2]));
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} else {
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printnum_int64(tcp, tcp->u_arg[3], "%" PRIu64);
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tprints(", ");
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printxval(whence_codes, tcp->u_arg[4], "SEEK_???");
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}
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return 0;
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}
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