gdb/testsuite/gdb.base/attach-wait-input.exp

   1 # Copyright 2014-2023 Free Software Foundation, Inc.
   2
   3 # This program is free software; you can redistribute it and/or modify
   4 # it under the terms of the GNU General Public License as published by
   5 # the Free Software Foundation; either version 3 of the License, or
   6 # (at your option) any later version.
   7 #
   8 # This program is distributed in the hope that it will be useful,
   9 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 # GNU General Public License for more details.
  12 #
  13 # You should have received a copy of the GNU General Public License
  14 # along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  15
  16 # Verify that GDB waits for the "attach" command to finish before
  17 # processing the following command.
  18 #
  19 # GDB used to have a race where on async targets, in the small window
  20 # between the attach request and the initial stop for the attach, GDB
  21 # was still processing user input.
  22 #
  23 # The issue was originally detected with:
  24 #
  25 #  echo -e "attach PID\nset xxx=1" | gdb
  26 #
  27 # In that scenario, stdin is not a tty, which disables readline.
  28 # Explicitly turning off editing exercises the same code path, and is
  29 # simpler to do, so we test with both editing on and off.
  30
  31 # The test uses the "attach" command.
  32 require !use_gdb_stub
  33
  34 standard_testfile
  35
  36 if {[build_executable "failed to build" $testfile $srcfile debug]} {
  37     return -1
  38 }
  39
  40 # Start the program running, and return its PID, ready for attaching.
  41
  42 proc start_program {binfile} {
  43     global gdb_prompt
  44     global decimal
  45
  46     clean_restart $binfile
  47
  48     if {![runto setup_done]} {
  49         return 0
  50     }
  51
  52     # Get the PID of the test process.
  53     set testpid ""
  54     set test "get inferior process ID"
  55     gdb_test_multiple "p mypid" $test {
  56         -re " = ($decimal)\r\n$gdb_prompt $" {
  57             set testpid $expect_out(1,string)
  58             pass $test
  59         }
  60     }
  61
  62     gdb_test "detach" "Detaching from program: .*"
  63
  64     if {$testpid == ""} {
  65         return
  66     }
  67
  68     return $testpid
  69 }
  70
  71 # Do test proper.  EDITING indicates whether "set editing" is on or
  72 # off.
  73
  74 proc test { editing } {
  75     global gdb_prompt
  76     global binfile
  77     global decimal
  78
  79     with_test_prefix "editing $editing" {
  80
  81         set testpid [start_program $binfile]
  82         if {$testpid == ""} {
  83             return
  84         }
  85
  86         # Enable/disable readline.
  87         gdb_test_no_output "set editing $editing"
  88
  89         # Send both commands at once.
  90         send_gdb "attach $testpid\nprint should_exit = 1\n"
  91
  92         # Use gdb_expect directly instead of gdb_test_multiple to
  93         # avoid races with the double prompt.
  94         set test "attach and print"
  95         gdb_expect {
  96             -re "Attaching to program.*process $testpid\r\n.*$gdb_prompt.*$decimal = 1\r\n$gdb_prompt $" {
  97                 pass "$test"
  98             }
  99             timeout {
 100                 fail "$test (timeout)"
 101             }
 102         }
 103
 104         # As we've used attach, on quit, we'll detach from the
 105         # program.  Explicitly kill it in case we failed above.
 106         gdb_test "kill" \
 107             "" \
 108             "after attach, exit" \
 109             "Kill the program being debugged.*y or n. $" \
 110             "y"
 111     }
 112 }
 113
 114 foreach editing {"on" "off"} {
 115     test $editing
 116 }