udev_monitor_receive_device

Index · Directives systemd 234

## Name

udev_monitor_receive_device, udev_monitor_enable_receiving, udev_monitor_set_receive_buffer_size, udev_monitor_get_fd, udev_monitor_get_udev — Query and modify device monitor

## Synopsis

    #include <libudev.h>

`struct udev_device *udev_monitor_receive_device(` | struct udev_monitor *udev_monitor`)`;

`int udev_monitor_enable_receiving(` | struct udev_monitor *udev_monitor`)`;

`int udev_monitor_set_receive_buffer_size(` | struct udev_monitor *udev_monitor,
| int size`)`;

`int udev_monitor_get_fd(` | struct udev_monitor *udev_monitor`)`;

`struct udev *udev_monitor_get_udev(` | struct udev_monitor *udev_monitor`)`;

## Return Value

On success, `udev_monitor_receive_device()` returns a pointer to a newly referenced device that was received via the monitor. The caller is responsible to drop this reference when done. On failure, `NULL` is returned.

On success, `udev_monitor_enable_receiving()` and `udev_monitor_set_receive_buffer_size()` return an integer greater than, or equal to, `0`. On failure, a negative error code is returned.

On success, `udev_monitor_get_fd()` returns the file descriptor used by this monitor. On failure, a negative error code is returned.

`udev_monitor_get_udev()` always returns a pointer to the udev context that this monitor is associated with.

## See Also

udev_new(3), udev_device_new_from_syspath(3), udev_enumerate_new(3), udev_monitor_new_from_netlink(3), udev_monitor_filter_update(3), udev_list_entry(3), systemd(1),