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 #include "ipc_defs.h"
  35
  36 #ifdef HAVE_SYS_MSG_H
  37 # include <sys/msg.h>
  38 #elif defined HAVE_LINUX_MSG_H
  39 # include <linux/msg.h>
  40 #endif
  41
  42 #include "xlat/ipc_msg_flags.h"
  43 #include "xlat/resource_flags.h"
  44
  45 SYS_FUNC(msgget)
  46 {
  47         const int key = (int) tcp->u_arg[0];
  48         if (key)
  49                 tprintf("%#x", key);
  50         else
  51                 tprints("IPC_PRIVATE");
  52         tprints(", ");
  53         if (printflags(resource_flags, tcp->u_arg[1] & ~0777, NULL) != 0)
  54                 tprints("|");
  55         print_numeric_umode_t(tcp->u_arg[1] & 0777);
  56         return RVAL_DECODED;
  57 }
  58
  59 static void
  60 tprint_msgsnd(struct tcb *const tcp, const kernel_ulong_t addr,
  61               const kernel_ulong_t count, const unsigned int flags)
  62 {
  63         tprint_msgbuf(tcp, addr, count);
  64         printflags(ipc_msg_flags, flags, "MSG_???");
  65 }
  66
  67 SYS_FUNC(msgsnd)
  68 {
  69         tprintf("%d, ", (int) tcp->u_arg[0]);
  70         if (indirect_ipccall(tcp)) {
  71                 tprint_msgsnd(tcp, tcp->u_arg[3], tcp->u_arg[1],
  72                               tcp->u_arg[2]);
  73         } else {
  74                 tprint_msgsnd(tcp, tcp->u_arg[1], tcp->u_arg[2],
  75                               tcp->u_arg[3]);
  76         }
  77         return RVAL_DECODED;
  78 }
  79
  80 static void
  81 tprint_msgrcv(struct tcb *const tcp, const kernel_ulong_t addr,
  82               const kernel_ulong_t count, const kernel_ulong_t msgtyp)
  83 {
  84         tprint_msgbuf(tcp, addr, count);
  85         tprintf("%" PRI_kld ", ", msgtyp);
  86 }
  87
  88 static int
  89 fetch_msgrcv_args(struct tcb *const tcp, const kernel_ulong_t addr,
  90                   kernel_ulong_t *const pair)
  91 {
  92         if (current_wordsize == sizeof(*pair)) {
  93                 if (umoven_or_printaddr(tcp, addr, 2 * sizeof(*pair), pair))
  94                         return -1;
  95         } else {
  96                 unsigned int tmp[2];
  97
  98                 if (umove_or_printaddr(tcp, addr, &tmp))
  99                         return -1;
 100                 pair[0] = tmp[0];
 101                 pair[1] = tmp[1];
 102         }
 103         return 0;
 104 }
 105
 106 SYS_FUNC(msgrcv)
 107 {
 108         if (entering(tcp)) {
 109                 tprintf("%d, ", (int) tcp->u_arg[0]);
 110         } else {
 111                 if (indirect_ipccall(tcp)) {
 112                         const bool direct =
 113 #ifdef SPARC64
 114                                 current_wordsize == 8 ||
 115 #endif
 116                                 get_tcb_priv_ulong(tcp) != 0;
 117                         if (direct) {
 118                                 tprint_msgrcv(tcp, tcp->u_arg[3],
 119                                               tcp->u_arg[1], tcp->u_arg[4]);
 120                         } else {
 121                                 kernel_ulong_t pair[2];
 122
 123                                 if (fetch_msgrcv_args(tcp, tcp->u_arg[3], pair))
 124                                         tprintf(", %" PRI_klu ", ", tcp->u_arg[1]);
 125                                 else
 126                                         tprint_msgrcv(tcp, pair[0],
 127                                                       tcp->u_arg[1], pair[1]);
 128                         }
 129                         printflags(ipc_msg_flags, tcp->u_arg[2], "MSG_???");
 130                 } else {
 131                         tprint_msgrcv(tcp, tcp->u_arg[1],
 132                                 tcp->u_arg[2], tcp->u_arg[3]);
 133                         printflags(ipc_msg_flags, tcp->u_arg[4], "MSG_???");
 134                 }
 135         }
 136         return 0;
 137 }