gdb/gcore.in

   1 #!/usr/bin/env bash
   2
   3 #   Copyright (C) 2003-2020 Free Software Foundation, Inc.
   4
   5 # This program is free software; you can redistribute it and/or modify
   6 # it under the terms of the GNU General Public License as published by
   7 # the Free Software Foundation; either version 3 of the License, or
   8 # (at your option) any later version.
   9 #
  10 # This program 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
  13 # GNU General Public License for more details.
  14 #
  15 # You should have received a copy of the GNU General Public License
  16 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17
  18 #
  19 # Script to generate a core file of a running program.
  20 # It starts up gdb, attaches to the given PID and invokes the gcore command.
  21 #
  22
  23 # Need to check for -o option, but set default basename to "core".
  24 prefix=core
  25
  26 # When the -a option is present, this may hold additional commands
  27 # to ensure gdb dumps all mappings (OS dependent).
  28 dump_all_cmds=()
  29
  30 while getopts :ao: opt; do
  31     case "$opt" in
  32         a)
  33             case "$OSTYPE" in
  34                 linux*)
  35                     dump_all_cmds=("-ex" "set use-coredump-filter off")
  36                     dump_all_cmds+=("-ex" "set dump-excluded-mappings on")
  37                     ;;
  38             esac
  39             ;;
  40         o)
  41             prefix=$OPTARG
  42             ;;
  43         *)
  44             echo "usage:  @GCORE_TRANSFORM_NAME@ [-a] [-o prefix] pid1 [pid2...pidN]"
  45             exit 2
  46             ;;
  47     esac
  48 done
  49
  50 shift $((OPTIND-1))
  51
  52 if [ "$#" -eq "0" ]
  53 then
  54     echo "usage:  @GCORE_TRANSFORM_NAME@ [-a] [-o prefix] pid1 [pid2...pidN]"
  55     exit 2
  56 fi
  57
  58 # Attempt to fetch the absolute path to the gcore script that was
  59 # called.
  60 binary_path=`dirname "$0"`
  61
  62 if test "x$binary_path" = x. ; then
  63   # We got "." back as a path.  This means the user executed
  64   # the gcore script locally (i.e. ./gcore) or called the
  65   # script via a shell interpreter (i.e. sh gcore).
  66   binary_basename=`basename "$0"`
  67
  68   # If the gcore script was called like "sh gcore" and the script
  69   # lives in the current directory, "which" will not give us "gcore".
  70   # So first we check if the script is in the current directory
  71   # before using the output of "which".
  72   if test -f "$binary_basename" ; then
  73     # We have a local gcore script in ".".  This covers the case of
  74     # doing "./gcore" or "sh gcore".
  75     binary_path="."
  76   else
  77     # The gcore script was not found in ".", which means the script
  78     # was called from somewhere else in $PATH by "sh gcore".
  79     # Extract the correct path now.
  80     binary_path_from_env=`which "$0"`
  81     binary_path=`dirname "$binary_path_from_env"`
  82   fi
  83 fi
  84
  85 # Check if the GDB binary is in the expected path.  If not, just
  86 # quit with a message.
  87 if [ ! -f "$binary_path/@GDB_TRANSFORM_NAME@" ]; then
  88   echo "gcore: GDB binary (${binary_path}/@GDB_TRANSFORM_NAME@) not found"
  89   exit 1
  90 fi
  91
  92 # Initialise return code.
  93 rc=0
  94
  95 # Loop through pids
  96 for pid in "$@"
  97 do
  98         # `</dev/null' to avoid touching interactive terminal if it is
  99         # available but not accessible as GDB would get stopped on SIGTTIN.
 100         "$binary_path/@GDB_TRANSFORM_NAME@" </dev/null \
 101             --nx --batch --readnever \
 102             -ex "set pagination off" -ex "set height 0" -ex "set width 0" \
 103             "${dump_all_cmds[@]}" \
 104             -ex "attach $pid" -ex "gcore $prefix.$pid" -ex detach -ex quit
 105
 106         if [ -r "$prefix.$pid" ] ; then
 107             rc=0
 108         else
 109             echo "@GCORE_TRANSFORM_NAME@: failed to create $prefix.$pid"
 110             rc=1
 111             break
 112         fi
 113
 114
 115 done
 116
 117 exit $rc