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fix(controller): ignore SIGUSR1 until polybar is fully reloaded. (#1678)

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To avoid polybar from being killed by SIGUSR1 during reloading, SIGUSR1 is ignored until the signal is registered in the new polybar process.

As stated in signal(7) man page, the ignored signals are still ignored after a call to a function of the execvX family.

    During an execve(2), the dispositions of handled signals are reset to the default;
    the dispositions of ignored signals are left unchanged.

Fixes #428
This commit is contained in:
Jérôme BOULMIER 2019-03-13 02:55:02 -04:00 committed by Patrick Ziegler
parent b3f7cd08e9
commit e3b84c9595
1 changed files with 10 additions and 0 deletions
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10
src/components/controller.cpp
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@ -26,6 +26,10 @@ sig_atomic_t g_reload{0};
sig_atomic_t g_terminate{0}; sig_atomic_t g_terminate{0};
void interrupt_handler(int signum) { void interrupt_handler(int signum) {
if (g_reload || g_terminate) {
return;
}
g_terminate = 1; g_terminate = 1;
g_reload = (signum == SIGUSR1); g_reload = (signum == SIGUSR1);
if (write(g_eventpipe[PIPE_WRITE], &g_terminate, 1) == -1) { if (write(g_eventpipe[PIPE_WRITE], &g_terminate, 1) == -1) {
@ -122,6 +126,12 @@ controller::~controller() {
signal(SIGINT, SIG_DFL); signal(SIGINT, SIG_DFL);
signal(SIGQUIT, SIG_DFL); signal(SIGQUIT, SIG_DFL);
signal(SIGTERM, SIG_DFL); signal(SIGTERM, SIG_DFL);
signal(SIGALRM, SIG_DFL);
if (g_reload) {
// Cause SIGUSR1 to be ignored until registered in the new polybar process
signal(SIGUSR1, SIG_IGN);
}
m_log.trace("controller: Detach signal receiver"); m_log.trace("controller: Detach signal receiver");
m_sig.detach(this); m_sig.detach(this);