From 766f883622ef008230250aa5aecef9fb9b29f233 Mon Sep 17 00:00:00 2001 From: Alan Hayward Date: Tue, 28 May 2019 10:07:54 +0100 Subject: [PATCH] Suppress SIGTTOU when handling errors Calls to error () can cause SIGTTOU to send gdb to the background. For example, on an Arm build: (gdb) b main Breakpoint 1 at 0x10774: file /build/gdb/testsuite/../../../src/binutils-gdb/gdb/testsuite/gdb.base/watchpoint.c, line 174. (gdb) r Starting program: /build/gdb/testsuite/outputs/gdb.base/watchpoint/watchpoint [1]+ Stopped ../gdb ./outputs/gdb.base/watchpoint/watchpoint localhost$ fg ../gdb ./outputs/gdb.base/watchpoint/watchpoint Cannot parse expression `.L1199 4@r4'. warning: Probes-based dynamic linker interface failed. Reverting to original interface. The SIGTTOU is raised whilst inside a syscall during the call to tcdrain. Fix is to use scoped_ignore_sigttou to ensure SIGTTOU is blocked. In addition fix include comments - job_control is not included via terminal.h gdb/ChangeLog: * event-top.c: Remove include comment. * inflow.c (class scoped_ignore_sigttou): Move from here... * inflow.h (class scoped_ignore_sigttou): ...to here. * ser-unix.c (hardwire_drain_output): Block SIGTTOU during drain. * top.c: Remove include comment. --- gdb/ChangeLog | 8 ++++++++ gdb/event-top.c | 2 +- gdb/inflow.c | 29 ----------------------------- gdb/inflow.h | 31 +++++++++++++++++++++++++++++++ gdb/ser-unix.c | 4 ++++ gdb/top.c | 2 +- 6 files changed, 45 insertions(+), 31 deletions(-) diff --git a/gdb/ChangeLog b/gdb/ChangeLog index 2d8bec90cea..15fe856541a 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,11 @@ +2019-05-28 Alan Hayward + + * event-top.c: Remove include comment. + * inflow.c (class scoped_ignore_sigttou): Move from here... + * inflow.h (class scoped_ignore_sigttou): ...to here. + * ser-unix.c (hardwire_drain_output): Block SIGTTOU during drain. + * top.c: Remove include comment. + 2019-05-27 Tom Tromey * NEWS: Fix typo. diff --git a/gdb/event-top.c b/gdb/event-top.c index 3ccf136ff12..93b7d2d28bc 100644 --- a/gdb/event-top.c +++ b/gdb/event-top.c @@ -24,7 +24,7 @@ #include "inferior.h" #include "infrun.h" #include "target.h" -#include "terminal.h" /* for job_control */ +#include "terminal.h" #include "event-loop.h" #include "event-top.h" #include "interps.h" diff --git a/gdb/inflow.c b/gdb/inflow.c index 339b55c0bc6..eba7a931f46 100644 --- a/gdb/inflow.c +++ b/gdb/inflow.c @@ -106,35 +106,6 @@ static serial_ttystate initial_gdb_ttystate; static struct terminal_info *get_inflow_inferior_data (struct inferior *); -/* RAII class used to ignore SIGTTOU in a scope. */ - -class scoped_ignore_sigttou -{ -public: - scoped_ignore_sigttou () - { -#ifdef SIGTTOU - if (job_control) - m_osigttou = signal (SIGTTOU, SIG_IGN); -#endif - } - - ~scoped_ignore_sigttou () - { -#ifdef SIGTTOU - if (job_control) - signal (SIGTTOU, m_osigttou); -#endif - } - - DISABLE_COPY_AND_ASSIGN (scoped_ignore_sigttou); - -private: -#ifdef SIGTTOU - sighandler_t m_osigttou = NULL; -#endif -}; - /* While the inferior is running, we want SIGINT and SIGQUIT to go to the inferior only. If we have job control, that takes care of it. If not, we save our handlers in these two variables and set SIGINT and SIGQUIT diff --git a/gdb/inflow.h b/gdb/inflow.h index c32aa144331..5dd5c37bd2b 100644 --- a/gdb/inflow.h +++ b/gdb/inflow.h @@ -21,5 +21,36 @@ #define INFLOW_H #include +#include +#include "common/job-control.h" + +/* RAII class used to ignore SIGTTOU in a scope. */ + +class scoped_ignore_sigttou +{ +public: + scoped_ignore_sigttou () + { +#ifdef SIGTTOU + if (job_control) + m_osigttou = signal (SIGTTOU, SIG_IGN); +#endif + } + + ~scoped_ignore_sigttou () + { +#ifdef SIGTTOU + if (job_control) + signal (SIGTTOU, m_osigttou); +#endif + } + + DISABLE_COPY_AND_ASSIGN (scoped_ignore_sigttou); + +private: +#ifdef SIGTTOU + sighandler_t m_osigttou = NULL; +#endif +}; #endif /* inflow.h */ diff --git a/gdb/ser-unix.c b/gdb/ser-unix.c index 5a9965bf744..3492619f2d6 100644 --- a/gdb/ser-unix.c +++ b/gdb/ser-unix.c @@ -32,6 +32,7 @@ #include "gdbcmd.h" #include "common/filestuff.h" #include +#include "inflow.h" struct hardwire_ttystate { @@ -164,6 +165,9 @@ hardwire_print_tty_state (struct serial *scb, static int hardwire_drain_output (struct serial *scb) { + /* Ignore SIGTTOU which may occur during the drain. */ + scoped_ignore_sigttou ignore_sigttou; + return tcdrain (scb->fd); } diff --git a/gdb/top.c b/gdb/top.c index bacd684dbaa..1e17ebee87c 100644 --- a/gdb/top.c +++ b/gdb/top.c @@ -34,7 +34,7 @@ #include "expression.h" #include "value.h" #include "language.h" -#include "terminal.h" /* For job_control. */ +#include "terminal.h" #include "common/job-control.h" #include "annotate.h" #include "completer.h" -- 2.30.2