os: add support for systemd notification
It can take some time for Xorg to start. If Xorg runs as a systemd service and other services are based on it, they have no way to determine when Xorg is really ready to accept requests. Let's use sd_notify() provided by libsystemd to signal systemd for readiness. If Xorg has not been started as a systemd service, this won't do anything. Signed-off-by: Topi Miettinen <toiwoton@gmail.com>
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@ -54,7 +54,8 @@ The X server may also be started directly by the user, though this
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method is usually reserved for testing and is not recommended for
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normal operation. On some platforms, the user must have special
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permission to start the X server, often because access to certain
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devices (e.g. \fI/dev/mouse\fP) is restricted.
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devices (e.g. \fI/dev/mouse\fP) is restricted. Where applicable, the
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X server notifies systemd when it is ready to process requests.
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.PP
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When the X server starts up, it typically takes over the display. If
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you are running on a workstation whose console is the display, you may
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@ -116,6 +116,10 @@ SOFTWARE.
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#define zoneid_t int
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#endif
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#ifdef HAVE_SYSTEMD_DAEMON
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#include <systemd/sd-daemon.h>
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#endif
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#include "probes.h"
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struct ospoll *server_poll;
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@ -207,6 +211,11 @@ NotifyParentProcess(void)
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}
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if (RunFromSigStopParent)
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raise(SIGSTOP);
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#ifdef HAVE_SYSTEMD_DAEMON
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/* If we have been started as a systemd service, tell systemd that
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we are ready. Otherwise sd_notify() won't do anything. */
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sd_notify(0, "READY=1");
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#endif
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#endif
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}
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