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head/share/man/man9/devctl_process_running.9
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| .\" | |||||
| .\" Copyright (c) 2020 M Warner Losh | |||||
| .\" | |||||
| .\" This program is free software. | |||||
| .\" | |||||
| .\" Redistribution and use in source and binary forms, with or without | |||||
| .\" modification, are permitted provided that the following conditions | |||||
| .\" are met: | |||||
| .\" 1. Redistributions of source code must retain the above copyright | |||||
| .\" notice, this list of conditions and the following disclaimer. | |||||
| .\" 2. Redistributions in binary form must reproduce the above copyright | |||||
| .\" notice, this list of conditions and the following disclaimer in the | |||||
| .\" documentation and/or other materials provided with the distribution. | |||||
| .\" | |||||
| .\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR | |||||
| .\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |||||
| .\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |||||
| .\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT, | |||||
| .\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |||||
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| .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |||||
| .\" | |||||
| .\" $FreeBSD$ | |||||
| .\" | |||||
| .Dd September 22, 2020 | |||||
| .Dt DEVCTL_PROCESS_RUNNING 9 | |||||
| .Os | |||||
| .Sh NAME | |||||
| .Nm devctl_process_running | |||||
| .Nd Returns true when devctl has a consumer process running | |||||
| .Sh SYNOPSIS | |||||
| .In sys/devctl.h | |||||
| .Ft bool | |||||
| .Fn devctl_process_running "void" | |||||
| .Sh DESCRIPTION | |||||
| The | |||||
| .Nm | |||||
| call returns | |||||
| .Vt true | |||||
| when a process has the devctl device open for | |||||
| reading, and | |||||
| .Vt false | |||||
| otherwise. | |||||
| One can assume from this that the default | |||||
| .Xr devd 8 | |||||
| or similar is running when | |||||
| .Vt true | |||||
| is returned. | |||||
| Some subsystems will send a message and allow userland to do something | |||||
| before proceeding with a default action if there's a timeout. | |||||
| This call allows those subsystems to do the default action right away | |||||
| when no process is running. | |||||
| .Sh SEE ALSO | |||||
| .Xr devd 8 | |||||
| .Sh AUTHORS | |||||
| This manual page was written by | |||||
| .An M. Warner Losh | |||||