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) 2015-2018 The strace developers.
   9  * All rights reserved.
  10  *
  11  * SPDX-License-Identifier: LGPL-2.1-or-later
  12  */
  13
  14 #include "defs.h"
  15 #include "ipc_defs.h"
  16
  17 #ifdef HAVE_SYS_MSG_H
  18 # include <sys/msg.h>
  19 #elif defined HAVE_LINUX_MSG_H
  20 # include <linux/msg.h>
  21 #endif
  22
  23 #include "xlat/ipc_msg_flags.h"
  24 #include "xlat/ipc_private.h"
  25 #include "xlat/resource_flags.h"
  26
  27 SYS_FUNC(msgget)
  28 {
  29         printxval(ipc_private, (unsigned int) tcp->u_arg[0], NULL);
  30         tprints(", ");
  31         if (printflags(resource_flags, tcp->u_arg[1] & ~0777, NULL) != 0)
  32                 tprints("|");
  33         print_numeric_umode_t(tcp->u_arg[1] & 0777);
  34         return RVAL_DECODED;
  35 }
  36
  37 static void
  38 tprint_msgsnd(struct tcb *const tcp, const kernel_ulong_t addr,
  39               const kernel_ulong_t count, const unsigned int flags)
  40 {
  41         tprint_msgbuf(tcp, addr, count);
  42         printflags(ipc_msg_flags, flags, "MSG_???");
  43 }
  44
  45 SYS_FUNC(msgsnd)
  46 {
  47         tprintf("%d, ", (int) tcp->u_arg[0]);
  48         if (indirect_ipccall(tcp)) {
  49                 tprint_msgsnd(tcp, tcp->u_arg[3], tcp->u_arg[1],
  50                               tcp->u_arg[2]);
  51         } else {
  52                 tprint_msgsnd(tcp, tcp->u_arg[1], tcp->u_arg[2],
  53                               tcp->u_arg[3]);
  54         }
  55         return RVAL_DECODED;
  56 }
  57
  58 static void
  59 tprint_msgrcv(struct tcb *const tcp, const kernel_ulong_t addr,
  60               const kernel_ulong_t count, const kernel_ulong_t msgtyp)
  61 {
  62         tprint_msgbuf(tcp, addr, count);
  63         tprintf("%" PRI_kld ", ", msgtyp);
  64 }
  65
  66 static int
  67 fetch_msgrcv_args(struct tcb *const tcp, const kernel_ulong_t addr,
  68                   kernel_ulong_t *const pair)
  69 {
  70         if (current_wordsize == sizeof(*pair)) {
  71                 if (umoven_or_printaddr(tcp, addr, 2 * sizeof(*pair), pair))
  72                         return -1;
  73         } else {
  74                 unsigned int tmp[2];
  75
  76                 if (umove_or_printaddr(tcp, addr, &tmp))
  77                         return -1;
  78                 pair[0] = tmp[0];
  79                 pair[1] = (int) tmp[1];
  80         }
  81         return 0;
  82 }
  83
  84 SYS_FUNC(msgrcv)
  85 {
  86         if (entering(tcp)) {
  87                 tprintf("%d, ", (int) tcp->u_arg[0]);
  88         } else {
  89                 if (indirect_ipccall(tcp)) {
  90                         const bool direct =
  91 #ifdef SPARC64
  92                                 current_wordsize == 8 ||
  93 #endif
  94                                 get_tcb_priv_ulong(tcp) != 0;
  95                         if (direct) {
  96                                 tprint_msgrcv(tcp, tcp->u_arg[3],
  97                                               tcp->u_arg[1], tcp->u_arg[4]);
  98                         } else {
  99                                 kernel_ulong_t pair[2];
 100
 101                                 if (fetch_msgrcv_args(tcp, tcp->u_arg[3], pair))
 102                                         tprintf(", %" PRI_klu ", ", tcp->u_arg[1]);
 103                                 else
 104                                         tprint_msgrcv(tcp, pair[0],
 105                                                       tcp->u_arg[1], pair[1]);
 106                         }
 107                         printflags(ipc_msg_flags, tcp->u_arg[2], "MSG_???");
 108                 } else {
 109                         tprint_msgrcv(tcp, tcp->u_arg[1],
 110                                 tcp->u_arg[2], tcp->u_arg[3]);
 111                         printflags(ipc_msg_flags, tcp->u_arg[4], "MSG_???");
 112                 }
 113         }
 114         return 0;
 115 }