155 lines
4.1 KiB
C
155 lines
4.1 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) 2005-2007 Roland McGrath <roland@redhat.com>
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* Copyright (c) 2006-2007 Ulrich Drepper <drepper@redhat.com>
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* Copyright (c) 2009-2013 Denys Vlasenko <dvlasenk@redhat.com>
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* Copyright (c) 2005-2015 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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* 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 "xstring.h"
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#include <asm/fcntl.h>
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/* some libcs are guilty of messing up with O_ACCMODE */
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#undef O_ACCMODE
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#define O_ACCMODE 03
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#ifdef O_LARGEFILE
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# if O_LARGEFILE == 0 /* biarch platforms in 64-bit mode */
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# undef O_LARGEFILE
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# endif
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#endif
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#include "xlat/open_access_modes.h"
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#include "xlat/open_mode_flags.h"
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#ifndef AT_FDCWD
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# define AT_FDCWD -100
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#endif
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/* The fd is an "int", so when decoding x86 on x86_64, we need to force sign
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* extension to get the right value. We do this by declaring fd as int here.
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*/
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void
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print_dirfd(struct tcb *tcp, int fd)
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{
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if (fd == AT_FDCWD)
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print_xlat_d(AT_FDCWD);
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else
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printfd(tcp, fd);
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tprints(", ");
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}
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/*
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* low bits of the open(2) flags define access mode,
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* other bits are real flags.
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*/
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const char *
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sprint_open_modes(unsigned int flags)
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{
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static char outstr[(1 + ARRAY_SIZE(open_mode_flags)) * sizeof("O_LARGEFILE")];
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char *p;
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char sep;
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const char *str;
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const struct xlat *x;
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sep = ' ';
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p = stpcpy(outstr, "flags");
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str = xlookup(open_access_modes, flags & 3);
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if (str) {
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*p++ = sep;
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p = stpcpy(p, str);
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flags &= ~3;
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if (!flags)
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return outstr;
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sep = '|';
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}
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for (x = open_mode_flags; x->str; x++) {
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if ((flags & x->val) == x->val) {
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*p++ = sep;
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p = stpcpy(p, x->str);
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flags &= ~x->val;
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if (!flags)
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return outstr;
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sep = '|';
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}
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}
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/* flags is still nonzero */
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*p++ = sep;
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p = xappendstr(outstr, p, "%#x", flags);
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return outstr;
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}
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void
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tprint_open_modes(unsigned int flags)
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{
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print_xlat_ex(flags, sprint_open_modes(flags) + sizeof("flags"),
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XLAT_STYLE_DEFAULT);
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}
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static int
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decode_open(struct tcb *tcp, int offset)
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{
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printpath(tcp, tcp->u_arg[offset]);
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tprints(", ");
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/* flags */
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tprint_open_modes(tcp->u_arg[offset + 1]);
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if (tcp->u_arg[offset + 1] & (O_CREAT | __O_TMPFILE)) {
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/* mode */
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tprints(", ");
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print_numeric_umode_t(tcp->u_arg[offset + 2]);
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}
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return RVAL_DECODED | RVAL_FD;
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}
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SYS_FUNC(open)
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{
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return decode_open(tcp, 0);
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}
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SYS_FUNC(openat)
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{
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print_dirfd(tcp, tcp->u_arg[0]);
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return decode_open(tcp, 1);
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}
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SYS_FUNC(creat)
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{
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printpath(tcp, tcp->u_arg[0]);
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tprints(", ");
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print_numeric_umode_t(tcp->u_arg[1]);
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return RVAL_DECODED | RVAL_FD;
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}
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