1# Copyright 2017-2020 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 31if [target_info exists gdb,noinferiorio] { 32 verbose "Skipping because of noinferiorio." 33 return 34} 35 36standard_testfile 37 38if [prepare_for_testing "failed to prepare" $testfile {} {debug}] { 39 return -1 40} 41 42if { ![runto_main] } then { 43 fail "run to main" 44 return 45} 46 47set printing_done_line [gdb_get_line_number "printing done"] 48gdb_test "break $printing_done_line" ".*" "set breakpoint after printing" 49 50send_gdb "continue\n" 51 52set expected_lines 3000 53set more 1 54set i 0 55while {$more} { 56 set more 0 57 gdb_expect { 58 -i $inferior_spawn_id 59 -ex "this is line number $i" { 60 incr i 61 if {$i != $expected_lines} { 62 set more 1 63 } 64 } 65 } 66} 67 68gdb_assert {$i == $expected_lines} "saw all lines" 69 70set test "breakpoint reached" 71gdb_test_multiple "" $test { 72 -re "Breakpoint .* main .*$srcfile:$printing_done_line.*$gdb_prompt $" { 73 pass $test 74 } 75} 76