gdb/testsuite/gdb.base/long-inferior-output.exp

   1 # Copyright 2017-2024 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 # When debugging with "target remote |", the inferior's output is
  17 # connected to a pipe, and if GDB doesn't flush the pipe while the
  18 # inferior is running and the pipe becomes full, then the inferior
  19 # deadlocks:
  20 #
  21 #  1. User sets breakpoint, and types "continue"
  22 #
  23 #  2. Inferior prints to stdout/stderr before reaching breakpoint
  24 #     location.
  25 #
  26 #  3. The output pipe becomes full, so the inferior blocks forever in
  27 #     the printf/write call.
  28 #
  29 #  4. The breakpoint is never reached.
  30
  31 require {!target_info exists gdb,noinferiorio}
  32
  33 standard_testfile
  34
  35 if [prepare_for_testing "failed to prepare" $testfile {} {debug}] {
  36     return -1
  37 }
  38
  39 if {![runto_main]} {
  40     return
  41 }
  42
  43 set printing_done_line [gdb_get_line_number "printing done"]
  44 gdb_test "break $printing_done_line" ".*" "set breakpoint after printing"
  45
  46 send_gdb "continue\n"
  47
  48 set expected_lines 3000
  49 set more 1
  50 set i 0
  51 while {$more} {
  52     set more 0
  53     gdb_expect {
  54         -i $inferior_spawn_id
  55         -ex "this is line number $i" {
  56             incr i
  57            if {$i != $expected_lines} {
  58                 set more 1
  59             }
  60         }
  61     }
  62 }
  63
  64 gdb_assert {$i == $expected_lines} "saw all lines"
  65
  66 set test "breakpoint reached"
  67 gdb_test_multiple "" $test {
  68     -re "Breakpoint .* main .*$srcfile:$printing_done_line.*$gdb_prompt $" {
  69         pass $test
  70     }
  71 }