granicus.if.org Git - strace/blob - ipc_msg.c

   1 /*
   2  * Copyright (c) 1993 Ulrich Pegelow <pegelow@moorea.uni-muenster.de>
   3  * Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
   4  * Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
   5  * Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
   6  * Copyright (c) 2003-2006 Roland McGrath <roland@redhat.com>
   7  * Copyright (c) 2006-2015 Dmitry V. Levin <ldv@altlinux.org>
   8  * Copyright (c) 2015-2017 The strace developers.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. The name of the author may not be used to endorse or promote products
  20  *    derived from this software without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  23  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  24  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  25  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  27  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  31  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #include "defs.h"
  35 #include "ipc_defs.h"
  36
  37 #ifdef HAVE_SYS_MSG_H
  38 # include <sys/msg.h>
  39 #elif defined HAVE_LINUX_MSG_H
  40 # include <linux/msg.h>
  41 #endif
  42
  43 #include "xlat/ipc_msg_flags.h"
  44 #include "xlat/resource_flags.h"
  45
  46 SYS_FUNC(msgget)
  47 {
  48         const int key = (int) tcp->u_arg[0];
  49         if (key)
  50                 tprintf("%#x", key);
  51         else
  52                 tprints("IPC_PRIVATE");
  53         tprints(", ");
  54         if (printflags(resource_flags, tcp->u_arg[1] & ~0777, NULL) != 0)
  55                 tprints("|");
  56         print_numeric_umode_t(tcp->u_arg[1] & 0777);
  57         return RVAL_DECODED;
  58 }
  59
  60 static void
  61 tprint_msgsnd(struct tcb *const tcp, const kernel_ulong_t addr,
  62               const kernel_ulong_t count, const unsigned int flags)
  63 {
  64         tprint_msgbuf(tcp, addr, count);
  65         printflags(ipc_msg_flags, flags, "MSG_???");
  66 }
  67
  68 SYS_FUNC(msgsnd)
  69 {
  70         tprintf("%d, ", (int) tcp->u_arg[0]);
  71         if (indirect_ipccall(tcp)) {
  72                 tprint_msgsnd(tcp, tcp->u_arg[3], tcp->u_arg[1],
  73                               tcp->u_arg[2]);
  74         } else {
  75                 tprint_msgsnd(tcp, tcp->u_arg[1], tcp->u_arg[2],
  76                               tcp->u_arg[3]);
  77         }
  78         return RVAL_DECODED;
  79 }
  80
  81 static void
  82 tprint_msgrcv(struct tcb *const tcp, const kernel_ulong_t addr,
  83               const kernel_ulong_t count, const kernel_ulong_t msgtyp)
  84 {
  85         tprint_msgbuf(tcp, addr, count);
  86         tprintf("%" PRI_kld ", ", msgtyp);
  87 }
  88
  89 static int
  90 fetch_msgrcv_args(struct tcb *const tcp, const kernel_ulong_t addr,
  91                   kernel_ulong_t *const pair)
  92 {
  93         if (current_wordsize == sizeof(*pair)) {
  94                 if (umoven_or_printaddr(tcp, addr, 2 * sizeof(*pair), pair))
  95                         return -1;
  96         } else {
  97                 unsigned int tmp[2];
  98
  99                 if (umove_or_printaddr(tcp, addr, &tmp))
 100                         return -1;
 101                 pair[0] = tmp[0];
 102                 pair[1] = tmp[1];
 103         }
 104         return 0;
 105 }
 106
 107 SYS_FUNC(msgrcv)
 108 {
 109         if (entering(tcp)) {
 110                 tprintf("%d, ", (int) tcp->u_arg[0]);
 111         } else {
 112                 if (indirect_ipccall(tcp)) {
 113                         const bool direct =
 114 #ifdef SPARC64
 115                                 current_wordsize == 8 ||
 116 #endif
 117                                 get_tcb_priv_ulong(tcp) != 0;
 118                         if (direct) {
 119                                 tprint_msgrcv(tcp, tcp->u_arg[3],
 120                                               tcp->u_arg[1], tcp->u_arg[4]);
 121                         } else {
 122                                 kernel_ulong_t pair[2];
 123
 124                                 if (fetch_msgrcv_args(tcp, tcp->u_arg[3], pair))
 125                                         tprintf(", %" PRI_klu ", ", tcp->u_arg[1]);
 126                                 else
 127                                         tprint_msgrcv(tcp, pair[0],
 128                                                       tcp->u_arg[1], pair[1]);
 129                         }
 130                         printflags(ipc_msg_flags, tcp->u_arg[2], "MSG_???");
 131                 } else {
 132                         tprint_msgrcv(tcp, tcp->u_arg[1],
 133                                 tcp->u_arg[2], tcp->u_arg[3]);
 134                         printflags(ipc_msg_flags, tcp->u_arg[4], "MSG_???");
 135                 }
 136         }
 137         return 0;
 138 }