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 31require {!target_info exists gdb,noinferiorio} 32 33standard_testfile 34 35if [prepare_for_testing "failed to prepare" $testfile {} {debug}] { 36 return -1 37} 38 39if {![runto_main]} { 40 return 41} 42 43set printing_done_line [gdb_get_line_number "printing done"] 44gdb_test "break $printing_done_line" ".*" "set breakpoint after printing" 45 46send_gdb "continue\n" 47 48set expected_lines 3000 49set more 1 50set i 0 51while {$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 != $expected_lines} { 58 set more 1 59 } 60 } 61 } 62} 63 64gdb_assert {$i == $expected_lines} "saw all lines" 65 66set test "breakpoint reached" 67gdb_test_multiple "" $test { 68 -re "Breakpoint .* main .*$srcfile:$printing_done_line.*$gdb_prompt $" { 69 pass $test 70 } 71} 72