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  * All rights reserved.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. The name of the author may not be used to endorse or promote products
  19  *    derived from this software without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include "defs.h"
  34
  35 #include <sys/ipc.h>
  36 #include <sys/msg.h>
  37
  38 #include "xlat/ipc_msg_flags.h"
  39 #include "xlat/resource_flags.h"
  40
  41 SYS_FUNC(msgget)
  42 {
  43         if (tcp->u_arg[0])
  44                 tprintf("%#lx, ", tcp->u_arg[0]);
  45         else
  46                 tprints("IPC_PRIVATE, ");
  47         if (printflags(resource_flags, tcp->u_arg[1] & ~0777, NULL) != 0)
  48                 tprints("|");
  49         tprintf("%#lo", tcp->u_arg[1] & 0777);
  50         return RVAL_DECODED;
  51 }
  52
  53 static void
  54 tprint_msgsnd(struct tcb *tcp, const long addr, const unsigned long count,
  55               const unsigned long flags)
  56 {
  57         tprint_msgbuf(tcp, addr, count);
  58         printflags(ipc_msg_flags, flags, "MSG_???");
  59 }
  60
  61 SYS_FUNC(msgsnd)
  62 {
  63         tprintf("%d, ", (int) tcp->u_arg[0]);
  64         if (indirect_ipccall(tcp)) {
  65                 tprint_msgsnd(tcp, tcp->u_arg[3], tcp->u_arg[1],
  66                               tcp->u_arg[2]);
  67         } else {
  68                 tprint_msgsnd(tcp, tcp->u_arg[1], tcp->u_arg[2],
  69                               tcp->u_arg[3]);
  70         }
  71         return RVAL_DECODED;
  72 }
  73
  74 static void
  75 tprint_msgrcv(struct tcb *tcp, const long addr, const unsigned long count,
  76               const long msgtyp)
  77 {
  78         tprint_msgbuf(tcp, addr, count);
  79         tprintf("%ld, ", msgtyp);
  80 }
  81
  82 static int
  83 fetch_msgrcv_args(struct tcb *tcp, const long addr, long *pair)
  84 {
  85         if (current_wordsize == sizeof(long)) {
  86                 if (umoven_or_printaddr(tcp, addr, 2 * sizeof(long), pair))
  87                         return -1;
  88         } else {
  89                 unsigned int tmp[2];
  90
  91                 if (umove_or_printaddr(tcp, addr, &tmp))
  92                         return -1;
  93                 pair[0] = tmp[0];
  94                 pair[1] = tmp[1];
  95         }
  96         return 0;
  97 }
  98
  99 SYS_FUNC(msgrcv)
 100 {
 101         if (entering(tcp)) {
 102                 tprintf("%d, ", (int) tcp->u_arg[0]);
 103         } else {
 104                 if (indirect_ipccall(tcp)) {
 105                         long pair[2];
 106
 107                         if (fetch_msgrcv_args(tcp, tcp->u_arg[3], pair))
 108                                 tprintf(", %lu, ", tcp->u_arg[1]);
 109                         else
 110                                 tprint_msgrcv(tcp, pair[0], tcp->u_arg[1], pair[1]);
 111                         printflags(ipc_msg_flags, tcp->u_arg[2], "MSG_???");
 112                 } else {
 113                         tprint_msgrcv(tcp, tcp->u_arg[1],
 114                                 tcp->u_arg[2], tcp->u_arg[3]);
 115                         printflags(ipc_msg_flags, tcp->u_arg[4], "MSG_???");
 116                 }
 117         }
 118         return 0;
 119 }