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

   1 /*
   2  * Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
   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) 1999-2017 The strace developers.
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. The name of the author may not be used to endorse or promote products
  18  *    derived from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  21  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  22  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  23  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  24  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  25  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  29  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #include "defs.h"
  33 #include "flock.h"
  34
  35 #include "xlat/f_owner_types.h"
  36 #include "xlat/f_seals.h"
  37 #include "xlat/fcntlcmds.h"
  38 #include "xlat/fcntl64cmds.h"
  39 #include "xlat/fdflags.h"
  40 #include "xlat/lockfcmds.h"
  41 #include "xlat/notifyflags.h"
  42
  43 static void
  44 print_struct_flock64(const struct_kernel_flock64 *fl, const int getlk)
  45 {
  46         tprints("{l_type=");
  47         printxval(lockfcmds, (unsigned short) fl->l_type, "F_???");
  48         tprints(", l_whence=");
  49         printxval(whence_codes, (unsigned short) fl->l_whence, "SEEK_???");
  50         tprintf(", l_start=%" PRId64 ", l_len=%" PRId64,
  51                 (int64_t) fl->l_start, (int64_t) fl->l_len);
  52         if (getlk)
  53                 tprintf(", l_pid=%lu", (unsigned long) fl->l_pid);
  54         tprints("}");
  55 }
  56
  57 static void
  58 printflock64(struct tcb *const tcp, const kernel_ulong_t addr, const int getlk)
  59 {
  60         struct_kernel_flock64 fl;
  61
  62         if (fetch_struct_flock64(tcp, addr, &fl))
  63                 print_struct_flock64(&fl, getlk);
  64 }
  65
  66 static void
  67 printflock(struct tcb *const tcp, const kernel_ulong_t addr, const int getlk)
  68 {
  69         struct_kernel_flock64 fl;
  70
  71         if (fetch_struct_flock(tcp, addr, &fl))
  72                 print_struct_flock64(&fl, getlk);
  73 }
  74
  75 static void
  76 print_f_owner_ex(struct tcb *const tcp, const kernel_ulong_t addr)
  77 {
  78         struct { int type, pid; } owner;
  79
  80         if (umove_or_printaddr(tcp, addr, &owner))
  81                 return;
  82
  83         tprints("{type=");
  84         printxval(f_owner_types, owner.type, "F_OWNER_???");
  85         tprintf(", pid=%d}", owner.pid);
  86 }
  87
  88 static int
  89 print_fcntl(struct tcb *tcp)
  90 {
  91         const unsigned int cmd = tcp->u_arg[1];
  92
  93         switch (cmd) {
  94         case F_SETFD:
  95                 tprints(", ");
  96                 printflags(fdflags, tcp->u_arg[2], "FD_???");
  97                 break;
  98         case F_SETOWN:
  99         case F_SETPIPE_SZ:
 100                 tprintf(", %" PRI_kld, tcp->u_arg[2]);
 101                 break;
 102         case F_DUPFD:
 103         case F_DUPFD_CLOEXEC:
 104                 tprintf(", %" PRI_kld, tcp->u_arg[2]);
 105                 return RVAL_DECODED | RVAL_FD;
 106         case F_SETFL:
 107                 tprints(", ");
 108                 tprint_open_modes(tcp->u_arg[2]);
 109                 break;
 110         case F_SETLK:
 111         case F_SETLKW:
 112                 tprints(", ");
 113                 printflock(tcp, tcp->u_arg[2], 0);
 114                 break;
 115         case F_OFD_SETLK:
 116         case F_OFD_SETLKW:
 117                 tprints(", ");
 118                 printflock64(tcp, tcp->u_arg[2], 0);
 119                 break;
 120         case F_SETOWN_EX:
 121                 tprints(", ");
 122                 print_f_owner_ex(tcp, tcp->u_arg[2]);
 123                 break;
 124         case F_NOTIFY:
 125                 tprints(", ");
 126                 printflags64(notifyflags, tcp->u_arg[2], "DN_???");
 127                 break;
 128         case F_SETLEASE:
 129                 tprints(", ");
 130                 printxval64(lockfcmds, tcp->u_arg[2], "F_???");
 131                 break;
 132         case F_ADD_SEALS:
 133                 tprints(", ");
 134                 printflags64(f_seals, tcp->u_arg[2], "F_SEAL_???");
 135                 break;
 136         case F_SETSIG:
 137                 tprints(", ");
 138                 tprints(signame(tcp->u_arg[2]));
 139                 break;
 140         case F_GETOWN:
 141         case F_GETPIPE_SZ:
 142                 break;
 143         case F_GETFD:
 144                 if (entering(tcp) || syserror(tcp) || tcp->u_rval == 0)
 145                         return 0;
 146                 tcp->auxstr = sprintflags("flags ", fdflags,
 147                                           (kernel_ulong_t) tcp->u_rval);
 148                 return RVAL_HEX | RVAL_STR;
 149         case F_GETFL:
 150                 if (entering(tcp) || syserror(tcp))
 151                         return 0;
 152                 tcp->auxstr = sprint_open_modes(tcp->u_rval);
 153                 return RVAL_HEX | RVAL_STR;
 154         case F_GETLK:
 155                 if (entering(tcp))
 156                         return 0;
 157                 tprints(", ");
 158                 printflock(tcp, tcp->u_arg[2], 1);
 159                 break;
 160         case F_OFD_GETLK:
 161                 if (entering(tcp))
 162                         return 0;
 163                 tprints(", ");
 164                 printflock64(tcp, tcp->u_arg[2], 1);
 165                 break;
 166         case F_GETOWN_EX:
 167                 if (entering(tcp))
 168                         return 0;
 169                 tprints(", ");
 170                 print_f_owner_ex(tcp, tcp->u_arg[2]);
 171                 break;
 172         case F_GETLEASE:
 173                 if (entering(tcp) || syserror(tcp))
 174                         return 0;
 175                 tcp->auxstr = xlookup(lockfcmds, (kernel_ulong_t) tcp->u_rval);
 176                 return RVAL_HEX | RVAL_STR;
 177         case F_GET_SEALS:
 178                 if (entering(tcp) || syserror(tcp) || tcp->u_rval == 0)
 179                         return 0;
 180                 tcp->auxstr = sprintflags("seals ", f_seals,
 181                                           (kernel_ulong_t) tcp->u_rval);
 182                 return RVAL_HEX | RVAL_STR;
 183         case F_GETSIG:
 184                 if (entering(tcp) || syserror(tcp) || tcp->u_rval == 0)
 185                         return 0;
 186                 tcp->auxstr = signame(tcp->u_rval);
 187                 return RVAL_STR;
 188         default:
 189                 tprintf(", %#" PRI_klx, tcp->u_arg[2]);
 190                 break;
 191         }
 192         return RVAL_DECODED;
 193 }
 194
 195 SYS_FUNC(fcntl)
 196 {
 197         if (entering(tcp)) {
 198                 printfd(tcp, tcp->u_arg[0]);
 199                 tprints(", ");
 200                 const unsigned int cmd = tcp->u_arg[1];
 201                 const char *str = xlookup(fcntlcmds, cmd);
 202                 if (str) {
 203                         tprints(str);
 204                 } else {
 205                         /*
 206                          * fcntl syscall does not recognize these
 207                          * constants, but we would like to show them
 208                          * for better debugging experience.
 209                          */
 210                         printxval(fcntl64cmds, cmd, "F_???");
 211                 }
 212         }
 213         return print_fcntl(tcp);
 214 }
 215
 216 SYS_FUNC(fcntl64)
 217 {
 218         const unsigned int cmd = tcp->u_arg[1];
 219         if (entering(tcp)) {
 220                 printfd(tcp, tcp->u_arg[0]);
 221                 tprints(", ");
 222                 const char *str = xlookup(fcntl64cmds, cmd);
 223                 if (str) {
 224                         tprints(str);
 225                 } else {
 226                         printxval(fcntlcmds, cmd, "F_???");
 227                 }
 228         }
 229         switch (cmd) {
 230                 case F_SETLK64:
 231                 case F_SETLKW64:
 232                         tprints(", ");
 233                         printflock64(tcp, tcp->u_arg[2], 0);
 234                         return RVAL_DECODED;
 235                 case F_GETLK64:
 236                         if (exiting(tcp)) {
 237                                 tprints(", ");
 238                                 printflock64(tcp, tcp->u_arg[2], 1);
 239                         }
 240                         return 0;
 241         }
 242         return print_fcntl(tcp);
 243 }