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