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93 lines
3.5 KiB
93 lines
3.5 KiB
/* |
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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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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. The name of the author may not be used to endorse or promote products |
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* derived from this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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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 | RVAL_UDECIMAL; |
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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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