nptl_db/td_ta_new.c

   1 /* Attach to target process.
   2    Copyright (C) 1999-2021 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@redhat.com>, 1999.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <https://www.gnu.org/licenses/>.  */
  19
  20 #include <stddef.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <version.h>
  24
  25 #include "thread_dbP.h"
  26
  27
  28 /* Datatype for the list of known thread agents.  Normally there will
  29    be exactly one so we don't spend much though on making it fast.  */
  30 LIST_HEAD (__td_agent_list);
  31
  32
  33 td_err_e
  34 td_ta_new (struct ps_prochandle *ps, td_thragent_t **ta)
  35 {
  36   psaddr_t versaddr;
  37   char versbuf[sizeof (VERSION)];
  38
  39   LOG ("td_ta_new");
  40
  41   /* Check whether the versions match.  */
  42   if (td_lookup (ps, SYM___nptl_version, &versaddr) != PS_OK)
  43     return TD_NOLIBTHREAD;
  44   if (ps_pdread (ps, versaddr, versbuf, sizeof (versbuf)) != PS_OK)
  45     return TD_ERR;
  46
  47   if (memcmp (versbuf, VERSION, sizeof VERSION) != 0)
  48     /* Not the right version.  */
  49     return TD_VERSION;
  50
  51   /* Fill in the appropriate information.  */
  52   *ta = (td_thragent_t *) calloc (1, sizeof (td_thragent_t));
  53   if (*ta == NULL)
  54     return TD_MALLOC;
  55
  56   /* Store the proc handle which we will pass to the callback functions
  57      back into the debugger.  */
  58   (*ta)->ph = ps;
  59
  60   /* Now add the new agent descriptor to the list.  */
  61   list_add (&(*ta)->list, &__td_agent_list);
  62
  63   return TD_OK;
  64 }