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# Copyright 2017-2023 Free Software Foundation, Inc.
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
# When debugging with "target remote |", the inferior's output is
# connected to a pipe, and if GDB doesn't flush the pipe while the
# inferior is running and the pipe becomes full, then the inferior
# deadlocks:
#
# 1. User sets breakpoint, and types "continue"
#
# 2. Inferior prints to stdout/stderr before reaching breakpoint
# location.
#
# 3. The output pipe becomes full, so the inferior blocks forever in
# the printf/write call.
#
# 4. The breakpoint is never reached.
require {!target_info exists gdb,noinferiorio}
standard_testfile
if [prepare_for_testing "failed to prepare" $testfile {} {debug}] {
return -1
}
if {![runto_main]} {
return
}
set printing_done_line [gdb_get_line_number "printing done"]
gdb_test "break $printing_done_line" ".*" "set breakpoint after printing"
send_gdb "continue\n"
set expected_lines 3000
set more 1
set i 0
while {$more} {
set more 0
gdb_expect {
-i $inferior_spawn_id
-ex "this is line number $i" {
incr i
if {$i != $expected_lines} {
set more 1
}
}
}
}
gdb_assert {$i == $expected_lines} "saw all lines"
set test "breakpoint reached"
gdb_test_multiple "" $test {
-re "Breakpoint .* main .*$srcfile:$printing_done_line.*$gdb_prompt $" {
pass $test
}
}
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