SND_CTL_ACTIVATE_ID(9) Control/Mixer API SND_CTL_ACTIVATE_ID(9)NAME
snd_ctl_activate_id - activate/inactivate the control of the given id
int snd_ctl_activate_id(struct snd_card * card, struct snd_ctl_elem_id * id, int active);
the card instance
the control id to activate/inactivate
non-zero to activate
Finds the control instance with the given id, and activate or inactivate the control together with notification, if changed.
0 if unchanged, 1 if changed, or a negative error code on failure.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 SND_CTL_ACTIVATE_ID(9)
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SYSTEMD-ACTIVATE(8) systemd-activate SYSTEMD-ACTIVATE(8)NAME
systemd-activate - Test socket activation of daemons
/usr/lib/systemd/systemd-activate [OPTIONS...] daemon [OPTIONS...]
systemd-activate can be used to launch a socket activated daemon from the command-line for testing purposes. It can also be used to launch
single instances of the daemon per connection (inetd-style).
The daemon to launch and its options should be specifed after options intended for systemd-activate.
If the -a option is given, file descriptor of the connection will be used as the standard input and output of the launched process.
Otherwise, standard input and output will be inherited, and sockets will be passed through file descriptors 3 and higher. Sockets passed
through $LISTEN_FDS to systemd-activate will be passed through to the dameon, in the original positions. Other sockets specified with
--listen will use consecutive descriptors.
OPTIONS --help, -h
Prints a short help text and exits.
Prints a short version string and exits.
-l address, --listen=address
Listen on this address. Takes a string like "2000" or "127.0.0.1:2001".
Launch a separate instance of daemon per connection and pass the connection socket as standard input and standard output.
-E VAR[=VALUE], --environment=VAR[=VALUE]
Add this variable to the environment of the launched process. If VAR is followed by "=", assume that it is a variable-value pair.
Otherwise, obtain the value from the environment of systemd-activate itself.
$SYSTEMD_LOG_TARGET, $SYSTEMD_LOG_LEVEL, $SYSTEMD_LOG_COLOR, $SYSTEMD_LOG_LOCATION
Same as in systemd(1).
$ /usr/lib/systemd/systemd-activate -l 2000 -a cat
This runs an echo server on port 2000.
$ /usr/lib/systemd/systemd-activate -l 19531 /usr/lib/systemd/systemd-journal-gatewayd
This runs a socket activated instance of systemd-journal-gatewayd(8).
SEE ALSO systemd(1), systemd.socket(5), systemd.service(5), cat(1)systemd 208SYSTEMD-ACTIVATE(8)
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