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

   1 /*
   2  * Copyright (c) 2016-2018 Dmitry V. Levin <ldv@altlinux.org>
   3  * All rights reserved.
   4  *
   5  * SPDX-License-Identifier: LGPL-2.1-or-later
   6  */
   7
   8 #include "defs.h"
   9
  10 #include DEF_MPERS_TYPE(struct_msghdr)
  11
  12 #include "msghdr.h"
  13 typedef struct msghdr struct_msghdr;
  14
  15 #include MPERS_DEFS
  16
  17 /*
  18  * On success, return the number of fetched bytes.
  19  * On error, return 0;
  20  *
  21  * This function cannot use umove_or_printaddr because
  22  * it is called by dumpio and therefore cannot print anything.
  23  */
  24
  25 MPERS_PRINTER_DECL(int, fetch_struct_msghdr,
  26                    struct tcb *const tcp, const kernel_ulong_t addr,
  27                    void *const p)
  28 {
  29         struct msghdr *const p_native = p;
  30         struct_msghdr v_compat;
  31
  32         if (sizeof(*p_native) == sizeof(v_compat))
  33                 return umove(tcp, addr, p_native) ? 0 : sizeof(*p_native);
  34
  35         if (umove(tcp, addr, &v_compat))
  36                 return 0;
  37
  38         p_native->msg_name = (void *) (unsigned long)
  39          v_compat.msg_name;
  40
  41         p_native->msg_namelen =
  42          v_compat.msg_namelen;
  43
  44         p_native->msg_iov = (void *) (unsigned long)
  45          v_compat.msg_iov;
  46
  47         p_native->msg_iovlen =
  48          v_compat.msg_iovlen;
  49
  50         p_native->msg_control = (void *) (unsigned long)
  51          v_compat.msg_control;
  52
  53         p_native->msg_controllen =
  54          v_compat.msg_controllen;
  55
  56         p_native->msg_flags =
  57          v_compat.msg_flags;
  58
  59         return sizeof(v_compat);
  60 }