From 5a0dd67a459338efb77f8d82bb3650d801ff0dd5 Mon Sep 17 00:00:00 2001 From: Yao Qi Date: Fri, 8 Jan 2016 11:06:00 +0000 Subject: [PATCH] Check input interrupt first when reading packet Hi, I see timeout in one of several runs of random-signal.exp like this, $ (set -e; while true; do make check RUNTESTFLAGS="--target_board=native-gdbserver random-signal.exp"; done) In about every five runs, we can see a fail, PASS: gdb.base/random-signal.exp: continue ^CFAIL: gdb.base/random-signal.exp: stop with control-c (timeout) after some investigation, I find '\003' may be discarded by GDBserver when it is expecting '$'. In GDB side, both normal packets and '\003' are sent via function send, but GDBserver may receive them at any time, that is to say, in the receive buffer in GDBserver, '\003' may appear before or after normal packet. However, current GDBserver doesn't handle this case. With this patch applied, I don't see this fail in multiple runs. Although there is still timeout fail, that is a different problem, the next patch will fix it. gdb/gdbserver: 2016-01-08 Yao Qi * remote-utils.c (getpkt): If c is '\003', call target hook request_interrupt. --- gdb/gdbserver/ChangeLog | 5 +++++ gdb/gdbserver/remote-utils.c | 9 +++++++++ 2 files changed, 14 insertions(+) diff --git a/gdb/gdbserver/ChangeLog b/gdb/gdbserver/ChangeLog index 0c9e73e..1c73f8b 100644 --- a/gdb/gdbserver/ChangeLog +++ b/gdb/gdbserver/ChangeLog @@ -1,3 +1,8 @@ +2016-01-08 Yao Qi + + * remote-utils.c (getpkt): If c is '\003', call target hook + request_interrupt. + 2016-01-06 Yao Qi * linux-aarch32-low.h (arm_abi_breakpoint): Move to diff --git a/gdb/gdbserver/remote-utils.c b/gdb/gdbserver/remote-utils.c index 5f43820..c5f4647 100644 --- a/gdb/gdbserver/remote-utils.c +++ b/gdb/gdbserver/remote-utils.c @@ -959,6 +959,15 @@ getpkt (char *buf) while (1) { c = readchar (); + + /* The '\003' may appear before or after each packet, so + check for an input interrupt. */ + if (c == '\003') + { + (*the_target->request_interrupt) (); + continue; + } + if (c == '$') break; if (remote_debug) -- 2.7.4