| /* |
| * 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> |
| * 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 | RVAL_UDECIMAL; |
| } |
| |
| /* 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; |
| } |
