granicus.if.org Git - strace/blob - ipc_shmctl.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
  16 #include DEF_MPERS_TYPE(shmid_ds_t)
  17
  18 #include "ipc_defs.h"
  19
  20 #ifdef HAVE_SYS_SHM_H
  21 /* The C library generally exports the struct the current kernel expects. */
  22 # include <sys/shm.h>
  23 typedef struct shmid_ds shmid_ds_t;
  24 #elif defined HAVE_LINUX_SHM_H
  25 /* The linux header might provide the right struct. */
  26 # include <linux/shm.h>
  27 typedef struct shmid64_ds shmid_ds_t;
  28 #endif
  29
  30 #include MPERS_DEFS
  31
  32 #include "xlat/shmctl_flags.h"
  33
  34 static void
  35 print_shmid_ds(struct tcb *const tcp, const kernel_ulong_t addr, int cmd)
  36 {
  37         /* TODO: We don't properly decode old compat ipc calls. */
  38         if (cmd & IPC_64)
  39                 cmd &= ~IPC_64;
  40         shmid_ds_t shmid_ds;
  41         switch (cmd) {
  42         case IPC_SET:
  43         case IPC_STAT:
  44                 if (umove_or_printaddr(tcp, addr, &shmid_ds))
  45                         return;
  46
  47                 tprints("{shm_perm={");
  48                 printuid("uid=", shmid_ds.shm_perm.uid);
  49                 printuid(", gid=", shmid_ds.shm_perm.gid);
  50                 tprints(", mode=");
  51                 print_numeric_umode_t(shmid_ds.shm_perm.mode);
  52
  53                 if (cmd != IPC_STAT) {
  54                         tprints("}, ...}");
  55                         break;
  56                 }
  57
  58                 tprintf(", key=%u", (unsigned) shmid_ds.shm_perm.__key);
  59                 printuid(", cuid=", shmid_ds.shm_perm.cuid);
  60                 printuid(", cgid=", shmid_ds.shm_perm.cgid);
  61                 tprints("}");
  62                 tprintf(", shm_segsz=%u", (unsigned) shmid_ds.shm_segsz);
  63                 tprintf(", shm_cpid=%u", (unsigned) shmid_ds.shm_cpid);
  64                 tprintf(", shm_lpid=%u", (unsigned) shmid_ds.shm_lpid);
  65                 tprintf(", shm_nattch=%u", (unsigned) shmid_ds.shm_nattch);
  66                 tprintf(", shm_atime=%u", (unsigned) shmid_ds.shm_atime);
  67                 tprintf(", shm_dtime=%u", (unsigned) shmid_ds.shm_dtime);
  68                 tprintf(", shm_ctime=%u", (unsigned) shmid_ds.shm_ctime);
  69                 tprints("}");
  70                 break;
  71
  72         default:
  73                 printaddr(addr);
  74                 break;
  75         }
  76 }
  77
  78 SYS_FUNC(shmctl)
  79 {
  80         if (entering(tcp)) {
  81                 tprintf("%d, ", (int) tcp->u_arg[0]);
  82                 PRINTCTL(shmctl_flags, tcp->u_arg[1], "SHM_???");
  83                 tprints(", ");
  84         } else {
  85                 const kernel_ulong_t addr = tcp->u_arg[indirect_ipccall(tcp) ? 3 : 2];
  86                 print_shmid_ds(tcp, addr, tcp->u_arg[1]);
  87         }
  88         return 0;
  89 }