nptl_db/td_ta_new.c

   1 /* Attach to target process.
   2    Copyright (C) 1999-2023 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <stddef.h>
  20 #include <stdlib.h>
  21 #include <string.h>
  22 #include <version.h>
  23
  24 #include "thread_dbP.h"
  25
  26
  27 /* Datatype for the list of known thread agents.  Normally there will
  28    be exactly one so we don't spend much though on making it fast.  */
  29 LIST_HEAD (__td_agent_list);
  30
  31
  32 td_err_e
  33 td_ta_new (struct ps_prochandle *ps, td_thragent_t **ta)
  34 {
  35   psaddr_t versaddr;
  36   char versbuf[sizeof (VERSION)];
  37
  38   LOG ("td_ta_new");
  39
  40   /* Check whether the versions match.  */
  41   if (td_lookup (ps, SYM___nptl_version, &versaddr) != PS_OK)
  42     return TD_NOLIBTHREAD;
  43   if (ps_pdread (ps, versaddr, versbuf, sizeof (versbuf)) != PS_OK)
  44     return TD_ERR;
  45
  46   if (memcmp (versbuf, VERSION, sizeof VERSION) != 0)
  47     /* Not the right version.  */
  48     return TD_VERSION;
  49
  50   /* Fill in the appropriate information.  */
  51   *ta = (td_thragent_t *) calloc (1, sizeof (td_thragent_t));
  52   if (*ta == NULL)
  53     return TD_MALLOC;
  54
  55   /* Store the proc handle which we will pass to the callback functions
  56      back into the debugger.  */
  57   (*ta)->ph = ps;
  58
  59   /* Now add the new agent descriptor to the list.  */
  60   list_add (&(*ta)->list, &__td_agent_list);
  61
  62   return TD_OK;
  63 }