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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<div class='path'>path: <a href='/guix/log/?id=3e1ebaab35e96f60bb2736af6c6cea244ae415c3'>root</a>/<a href='/guix/log/gnu?id=3e1ebaab35e96f60bb2736af6c6cea244ae415c3'>gnu</a>/<a href='/guix/log/gnu/packages?id=3e1ebaab35e96f60bb2736af6c6cea244ae415c3'>packages</a>/<a href='/guix/log/gnu/packages/gnucash.scm?id=3e1ebaab35e96f60bb2736af6c6cea244ae415c3'>gnucash.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/packages/gnucash.scm?id=3e1ebaab35e96f60bb2736af6c6cea244ae415c3&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2018-04-13 09:41:13 +0200'>2018-04-13</span></td><td><a href='/guix/commit/gnu/packages/gnucash.scm?id=53e66fbceb275262184ad44f60a5a8d4e7061fcb'>gnu: gnucash: Update to 3.0.</a><span class='msg-avail'>...</span></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2018-04-13 09:41:13 +0200'>2018-04-13</span></td><td><a href='/guix/commit/gnu/packages/gnucash.scm?id=2f5ccf27b239ba3415c4329978ffa09aa36b5fe8'>gnu: aqbanking: Update to 5.7.8.</a><span class='msg-avail'>...</span></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2018-04-13 09:41:09 +0200'>2018-04-13</span></td><td><a href='/guix/commit/gnu/packages/gnucash.scm?id=aef8a9fb0e53c5d2fbeea4e0681444d327c39b04'>gnu: gwenhywfar: Update to 4.20.0.</a><span class='msg-avail'>...</span></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2018-01-09 11:42:51 -0500'>2018-01-09</span></td><td><a href='/guix/commit/gnu/packages/gnucash.scm?id=5b72dafe44625ad9844ec0fc38b315630fb99a12'>gnu: gnucash: Update to 2.6.19.</a><span class='msg-avail'>...</span></td><td>Kei Kebreau</td></tr>
<tr><td><span title='2017-11-15 03:19:19 +0100'>2017-11-15</span></td><td><a href='/guix/commit/gnu/packages/gnucash.scm?id=7c1adf0090b39936ea8100e6a6cb76b031b75f53'>gnu: gnucash: Use HTTPS for www.gnucash.org.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2017-11-15 03:19:18 +0100'>2017-11-15</span></td><td><a href='/guix/commit/gnu/packages/gnucash.scm?id=471ce31cd725bcead026d93e662bf80c2ad655a1'>gnu: gnucash: Update to 2.6.18.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2017-10-13 01:05:54 -0700'>2017-10-13</span></td><td><a href='/guix/commit/gnu/packages/gnucash.scm?id=f3eeca5621ac7c3644895e253395878dfdbdd87e'>gnu: Add GnuCash documentation.</a><span class='msg-avail'>...</span></td><td>Chris Marusich</td></tr>
<tr><td><span title='2017-08-06 10:01:56 +0530'>2017-08-06</span></td><td><a href='/guix/commit/gnu/packages/gnucash.scm?id=799097e445e67227313cbb4809a67cfc76081cf7'>gnu: gnucash: Update to 2.6.17.</a><span class='msg-avail'>...</span></td><td>Vasile Dumitrascu</td></tr>
<tr><td><span title='2017-04-10 15:42:05 -0400'>2017-04-10</span></td><td><a href='/guix/commit/gnu/packages/gnucash.scm?id=64463bd7c9d01257b8a02d9d50501f1eed4f0f0a'>gnu: gnucash: Update to 2.6.16.</a><span class='msg-avail'>...</span></td><td>Leo Famulari</td></tr>
<tr><td><span title='2017-01-17 15:07:08 +0100'>2017-01-17</span></td><td><a href='/guix/commit/gnu/packages/gnucash.scm?id=c554c6bab878b32f476aaf89c08e22d5b3c1cb56'>gnu: gnucash: Update to 2.6.15.</a><span class='msg-avail'>...</span></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2017-01-13 07:28:52 +0100'>2017-01-13</span></td><td><a href='/guix/commit/gnu/packages/gnucash.scm?id=7d3546292386544d07de91e943f92708ad0ff543'>gnu: aqbanking: Update source hash.</a><span class='msg-avail'>...</span></td><td>John Darrington</td></tr>
<tr><td><span title='2017-01-09 18:55:27 +0100'>2017-01-09</span></td><td><a href='/guix/commit/gnu/packages/gnucash.scm?id=cac19f0df947ef656cc8e276b2538aab7d927367'>gnu: Update aqbanking to version 5.6.12.</a><span class='msg-avail'>...</span></td><td>John Darrington</td></tr>
<tr><td><span title='2017-01-09 17:50:49 +0100'>2017-01-09</span></td><td><a href='/guix/commit/gnu/packages/gnucash.scm?id=834458f6ff91fbe8be7c2997915f3aee20e47829'>gnu: Simplify the downloads from http://www.aquamaniac.de</a><span class='msg-avail'>...</span></td><td>John Darrington</td></tr>
<tr><td><span title='2016-10-05 20:42:49 +0300'>2016-10-05</span></td><td><a href='/guix/commit/gnu/packages/gnucash.scm?id=a4796b29e14e0930d6afa4f99205619b60ef6ed7'>gnu: gnucash: Update to 2.6.14.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>