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This patch fixes SLiM so it really waits for the X server to be ready
before attempting to connect to it. Indeed, the X server notices that
its parent process has a handler for SIGUSR1, and consequently sends it
SIGUSR1 when it's ready to accept connections.
The problem was that SLiM doesn't pay attention to SIGUSR1. So in practice,
if X starts slowly, then SLiM gets ECONNREFUSED a couple of time on
/tmp/.X11-unix/X0, then goes on trying to connect to localhost:6000,
where nobody answers; eventually, it times out and tries again on
/tmp/.X11-unix/X0, and finally it shows up on the screen.
Patch by L. Courtès.
--- slim-1.3.6/app.cpp 2014-02-05 15:27:20.000000000 +0100
+++ slim-1.3.6/app.cpp 2014-02-09 22:42:04.000000000 +0100
@@ -119,7 +119,9 @@ void CatchSignal(int sig) {
exit(ERR_EXIT);
}
+static volatile int got_sigusr1 = 0;
void User1Signal(int sig) {
+ got_sigusr1 = 1;
signal(sig, User1Signal);
}
@@ -884,6 +886,7 @@ int App::WaitForServer() {
int ncycles = 120;
int cycles;
+ while (!got_sigusr1);
for(cycles = 0; cycles < ncycles; cycles++) {
if((Dpy = XOpenDisplay(DisplayName))) {
XSetIOErrorHandler(xioerror);
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