EGD_OPEN(3) - Linux man page online | Library functions
Open an EEG device.
EGD_OPEN(3) EEGDEV library manual EGD_OPEN(3)
EPFL 2010 EGD_OPEN(3)
NAMEegd_open - Open an EEG device
SYNOPSIS#include <eegdev.h> struct eegdev* egd_open(const char* devstring);
DESCRIPTIONegd_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 configured with (overriding defaults set‐ tings). 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 configuration files. The final values of the set‐ tings 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 VALUEThe function returns a pointer to the opened EEG device in case of success. Otherwise NULL is returned errno is set accordingly.
ERRORSegd_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.
ENVIRONMENTEEGDEV_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 ALSOegd_close(3), eegdev-open-options(5)
|This manual||Reference||Other manuals|
|egd_open(3)||referred by||eegdev-biosemi(5) | eegdev-datafile(5) | eegdev-open-options(5) | eegdev-tobiia(5)|
|refer to||eegdev-open-options(5) | egd_close(3)|