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Reset signal mask after fork

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wlroots uses wl_event_loop_add_signal to handle SIGUSR1 from Xwayland.
wl_event_loop_add_signal works by masking the signal and receiving it from a
signalfd. The signal mask is preserved across fork and exec, so subprocesses
spawned by Sway start with SIGUSR1 masked. Most subprocesses do not expect this
and never unmask the signal, resulting in missing functionality or unexpected
behavior for processes that use SIGUSR1 (such as i3status).

Fix this by unmasking all signals between fork and exec.
This commit is contained in:
Marien Zwart 2018-08-01 23:21:29 +10:00
parent d6095588a1
commit 7d8413d962
2 changed files with 8 additions and 0 deletions
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4
sway/commands/exec_always.c
View file

@ -4,6 +4,7 @@
#include <string.h> #include <string.h>
#include <sys/wait.h> #include <sys/wait.h>
#include <unistd.h> #include <unistd.h>
#include <signal.h>
#include "sway/commands.h" #include "sway/commands.h"
#include "sway/config.h" #include "sway/config.h"
#include "sway/tree/container.h" #include "sway/tree/container.h"
@ -47,6 +48,9 @@ struct cmd_results *cmd_exec_always(int argc, char **argv) {
if ((pid = fork()) == 0) { if ((pid = fork()) == 0) {
// Fork child process again // Fork child process again
setsid(); setsid();
sigset_t set;
sigemptyset(&set);
sigprocmask(SIG_SETMASK, &set, NULL);
close(fd[0]); close(fd[0]);
if ((child = fork()) == 0) { if ((child = fork()) == 0) {
close(fd[1]); close(fd[1]);

4
sway/config/bar.c
View file

@ -10,6 +10,7 @@
#include <sys/stat.h> #include <sys/stat.h>
#include <signal.h> #include <signal.h>
#include <strings.h> #include <strings.h>
#include <signal.h>
#include "sway/config.h" #include "sway/config.h"
#include "stringop.h" #include "stringop.h"
#include "list.h" #include "list.h"
@ -175,6 +176,9 @@ void invoke_swaybar(struct bar_config *bar) {
if (bar->pid == 0) { if (bar->pid == 0) {
setpgid(0, 0); setpgid(0, 0);
close(filedes[0]); close(filedes[0]);
sigset_t set;
sigemptyset(&set);
sigprocmask(SIG_SETMASK, &set, NULL);
// run custom swaybar // run custom swaybar
size_t len = snprintf(NULL, 0, "%s -b %s", size_t len = snprintf(NULL, 0, "%s -b %s",