EGD_CLOSE(3) EEGDEV library manual EGD_CLOSE(3)NAME
egd_close - close a device
SYNOPSIS
#include <eegdev.h>
int egd_close(struct eegdev* dev);
DESCRIPTION
egd_close() frees all resources associated to the device referenced by dev and closes it. It stops also implicitely any running acquisi-
tion.
After a successful call to egd_close(), the reference dev cannot be used any longer.
RETURN VALUE
The function returns 0 in case of succes. Otherwise, -1 is returned and errno is set accordingly.
ERRORS
egd_close() will fail if:
EINVAL dev is NULL.
EPFL 2010 EGD_CLOSE(3)
Check Out this Related Man Page
EGD_OPEN(3) EEGDEV library manual EGD_OPEN(3)NAME
egd_open - Open an EEG device
SYNOPSIS
#include <eegdev.h>
struct eegdev* egd_open(const char* devstring);
DESCRIPTION
egd_open() opens a EEG device according to the devstring description. If devstring is NULL, the first device supported by the library will
be opened.
The devstring argument specifies the type of EEG device required to be opened and the parameters parameters which the system should be con-
figured with (overriding defaults settings). The syntax of the string is defined in eegdev-open-options(5).
The syntax may change in future releases and programs should not rely on it to configure the device. It is provided only to users of the
programs to select the EEG acquisition device and configure it. Programs using the eegdev library should pass the string provided by the
users untouched.
devstring is not the only way to provides configuration information about the device to open. The configuration is read from the configura-
tion files. The final values of the settings provided to the opening function are defined (and overriden) in the following order:
* default values
* shared configuration file
* device specific configuration file
* devstring
This order indicates that a setting value specified in devstring will always override any setting value defined by other mean.
RETURN VALUE
The function returns a pointer to the opened EEG device in case of success. Otherwise NULL is returned errno is set accordingly.
ERRORS
egd_open() will fail if:
ENOSYS the device part of devstring does not refer to a device supported by any of the installed eegdev plugin modules.
EINVAL one of the option specified in devstring is unknown.
ENODEV The specified device is not connected.
EBUSY The specified device is already in use.
ECHILD The specified device needs an auxiliary child process whose executable file cannot be found.
ENVIRONMENT
EEGDEV_PLUGINS_DIR
This variable controls which folder should be search to find plugin modules. If unset, they will be searched in the subfolder eegdev
of the installation folder of the libraries.
EEGDEV_CONF_DIR
This variable controls which folder should be search to find the configuration files. If unset, they will be searched in /etc/eegdev.
SEE ALSO egd_close(3), eegdev-open-options(5)EPFL 2010 EGD_OPEN(3)
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