systemd sd_device_get_syspath 3 sd_device_get_syspath sd_device_get_devpath sd_device_get_sysname sd_device_get_sysnum sd_device_get_subsystem sd_device_get_devtype sd_device_get_devname sd_device_get_devnum sd_device_get_ifindex sd_device_get_driver sd_device_get_diskseq Returns various fields of device objects #include <systemd/sd-device.h> int sd_device_get_syspath sd_device *device const char **ret int sd_device_get_devpath sd_device *device const char **ret int sd_device_get_sysname sd_device *device const char **ret int sd_device_get_sysnum sd_device *device const char **ret int sd_device_get_subsystem sd_device *device const char **ret int sd_device_get_devtype sd_device *device const char **ret int sd_device_get_devname sd_device *device const char **ret int sd_device_get_devnum sd_device *device dev_t *ret int sd_device_get_ifindex sd_device *device int *ret int sd_device_get_driver sd_device *device const char **ret int sd_device_get_diskseq sd_device *device uint64_t *ret sd_device_get_syspath() returns the sysfs path of the specified device record, including the /sys prefix. Example: /sys/devices/virtual/tty/tty7 sd_device_get_devpath() returns the sysfs path of the specified device record, excluding the /sys prefix. Example: /devices/virtual/tty/tty7 sd_device_get_sysname() returns the sysfs name of the specified device record, i.e. the last component of the sysfs path. Example: tty7 for the device /sys/devices/virtual/tty/tty7 sd_device_get_sysnum() returns the sysfs device number of the specified device record, i.e. the numeric suffix of the last component of the sysfs path. Example: 7 for the device /sys/devices/virtual/tty/tty7 sd_device_get_subsystem() returns the kernel subsystem of the specified device record. This is a short string fitting into a filename, and thus does not contain a slash and cannot be empty. Example: tty, block or net. sd_device_get_devtype() returns the device type of the specified device record, if the subsystem manages multiple types of devices. Example: for devices of the block subsystem this can be disk or partition sd_device_get_devname() returns the device node path of the specified device record if the device has a device node. Example: for /sys/devices/virtual/tty/tty7 the string /dev/tty7 is typically returned. sd_device_get_devnum() returns the device node major/minor (i.e. dev_t) of the specified device record if the device has a device node (i.e. the one returned by sd_device_get_devname()). For devices belonging to the block subsystem this refers to a block device node, in all other cases to a character device node. Example: for the /sys/devices/virtual/tty/tty7 device this typically returns the device number with major/minor 4:7. sd_device_get_ifindex() returns the network interface index of the specified device record, if the device encapsulates a network interface device, i.e. belongs to the net subsystem. Example: the lo interface typically has interface index 1. sd_device_get_driver() returns the kernel driver name attached to the device. Note that the driver field is set on the devices consumed by the driver, not on the device created by it. Example: a PCI device /sys/bus/pci/devices/0000:00:1f.6 might be attached to a driver e1000e. sd_device_get_diskseq() returns the kernel disk sequence number of the block device. This number monotonically increases whenever a backing medium of a block device changes without the device name changing, and is relevant for block devices encapsulating devices with changing media (e.g. floppy or CD-ROM), or loopback block devices. Only defined for block devices, i.e. those of subsystem block. On success, these calls return 0 or a positive integer. On failure, they return a negative errno-style error code. Returned errors may indicate the following problems: -EINVAL A specified parameter is invalid. -ENOENT The requested field is not present in the device record. systemd1