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, fl->l_type, "F_???");
  47         tprints(", l_whence=");
  48         printxval(whence_codes, 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         switch (tcp->u_arg[1]) {
  91         case F_SETFD:
  92                 tprints(", ");
  93                 printflags(fdflags, tcp->u_arg[2], "FD_???");
  94                 break;
  95         case F_SETOWN:
  96         case F_SETPIPE_SZ:
  97                 tprintf(", %ld", tcp->u_arg[2]);
  98                 break;
  99         case F_DUPFD:
 100         case F_DUPFD_CLOEXEC:
 101                 tprintf(", %ld", tcp->u_arg[2]);
 102                 return RVAL_DECODED | RVAL_FD;
 103         case F_SETFL:
 104                 tprints(", ");
 105                 tprint_open_modes(tcp->u_arg[2]);
 106                 break;
 107         case F_SETLK:
 108         case F_SETLKW:
 109                 tprints(", ");
 110                 printflock(tcp, tcp->u_arg[2], 0);
 111                 break;
 112         case F_OFD_SETLK:
 113         case F_OFD_SETLKW:
 114                 tprints(", ");
 115                 printflock64(tcp, tcp->u_arg[2], 0);
 116                 break;
 117         case F_SETOWN_EX:
 118                 tprints(", ");
 119                 print_f_owner_ex(tcp, tcp->u_arg[2]);
 120                 break;
 121         case F_NOTIFY:
 122                 tprints(", ");
 123                 printflags(notifyflags, tcp->u_arg[2], "DN_???");
 124                 break;
 125         case F_SETLEASE:
 126                 tprints(", ");
 127                 printxval(lockfcmds, tcp->u_arg[2], "F_???");
 128                 break;
 129         case F_ADD_SEALS:
 130                 tprints(", ");
 131                 printflags(f_seals, tcp->u_arg[2], "F_SEAL_???");
 132                 break;
 133         case F_SETSIG:
 134                 tprints(", ");
 135                 tprints(signame(tcp->u_arg[2]));
 136                 break;
 137         case F_GETOWN:
 138         case F_GETPIPE_SZ:
 139                 break;
 140         case F_GETFD:
 141                 if (entering(tcp) || syserror(tcp) || tcp->u_rval == 0)
 142                         return 0;
 143                 tcp->auxstr = sprintflags("flags ", fdflags, tcp->u_rval);
 144                 return RVAL_HEX | RVAL_STR;
 145         case F_GETFL:
 146                 if (entering(tcp) || syserror(tcp))
 147                         return 0;
 148                 tcp->auxstr = sprint_open_modes(tcp->u_rval);
 149                 return RVAL_HEX | RVAL_STR;
 150         case F_GETLK:
 151                 if (entering(tcp))
 152                         return 0;
 153                 tprints(", ");
 154                 printflock(tcp, tcp->u_arg[2], 1);
 155                 break;
 156         case F_OFD_GETLK:
 157                 if (entering(tcp))
 158                         return 0;
 159                 tprints(", ");
 160                 printflock64(tcp, tcp->u_arg[2], 1);
 161                 break;
 162         case F_GETOWN_EX:
 163                 if (entering(tcp))
 164                         return 0;
 165                 tprints(", ");
 166                 print_f_owner_ex(tcp, tcp->u_arg[2]);
 167                 break;
 168         case F_GETLEASE:
 169                 if (entering(tcp) || syserror(tcp))
 170                         return 0;
 171                 tcp->auxstr = xlookup(lockfcmds, tcp->u_rval);
 172                 return RVAL_HEX | RVAL_STR;
 173         case F_GET_SEALS:
 174                 if (entering(tcp) || syserror(tcp) || tcp->u_rval == 0)
 175                         return 0;
 176                 tcp->auxstr = sprintflags("seals ", f_seals, tcp->u_rval);
 177                 return RVAL_HEX | RVAL_STR;
 178         case F_GETSIG:
 179                 if (entering(tcp) || syserror(tcp) || tcp->u_rval == 0)
 180                         return 0;
 181                 tcp->auxstr = signame(tcp->u_rval);
 182                 return RVAL_STR;
 183         default:
 184                 tprintf(", %#lx", tcp->u_arg[2]);
 185                 break;
 186         }
 187         return RVAL_DECODED;
 188 }
 189
 190 SYS_FUNC(fcntl)
 191 {
 192         if (entering(tcp)) {
 193                 printfd(tcp, tcp->u_arg[0]);
 194                 tprints(", ");
 195                 const char *str = xlookup(fcntlcmds, tcp->u_arg[1]);
 196                 if (str) {
 197                         tprints(str);
 198                 } else {
 199                         /*
 200                          * fcntl syscall does not recognize these
 201                          * constants, but we would like to show them
 202                          * for better debugging experience.
 203                          */
 204                         printxval(fcntl64cmds, tcp->u_arg[1], "F_???");
 205                 }
 206         }
 207         return print_fcntl(tcp);
 208 }
 209
 210 SYS_FUNC(fcntl64)
 211 {
 212         if (entering(tcp)) {
 213                 printfd(tcp, tcp->u_arg[0]);
 214                 tprints(", ");
 215                 const char *str = xlookup(fcntl64cmds, tcp->u_arg[1]);
 216                 if (str) {
 217                         tprints(str);
 218                 } else {
 219                         printxval(fcntlcmds, tcp->u_arg[1], "F_???");
 220                 }
 221         }
 222         switch (tcp->u_arg[1]) {
 223                 case F_SETLK64:
 224                 case F_SETLKW64:
 225                         tprints(", ");
 226                         printflock64(tcp, tcp->u_arg[2], 0);
 227                         return RVAL_DECODED;
 228                 case F_GETLK64:
 229                         if (exiting(tcp)) {
 230                                 tprints(", ");
 231                                 printflock64(tcp, tcp->u_arg[2], 1);
 232                         }
 233                         return 0;
 234         }
 235         return print_fcntl(tcp);
 236 }