A device driver is a special code that interfaces a physical device into the system and exports it to the user-space processes using a well-defined API. In a UNIX-like OS, where everything is a file, the physical device is represented as a file. Then, the device driver implements all ...
Allocation notification is an in-progress feature that isn't yet enabled for final use. This feature allows kernel-mode drivers to receive notifications about an allocation that's about to undergo a paging eviction or promotion operation.File...
The chapter will also introduce how to do I/O memory access, and how to safely spend time within the kernel in order to create well-defined busy loop delays. Chapter 7, Advanced Char Driver Operations, presents all the advanced operations that are available on character drivers: ioctl(), ...
thereby resulting in either a loss of functionality or a loss of performance. Some of this could be overcomed by the use of theioctl operationthat provides a general-purpose interface for processes to invoke operations
New tools chattr(1) and lsattr(1) to utilize setting and viewing the aforementioned new ioctl's on the command line. Support for exFAT. Support Linux-specific open(2) flag O_PATH. Support Linux-specific linkat(2) flag AT_EMPTY_PATH. Support overrun counter for posix timers (via ...
The following message is output Raw kernel: involflt[process_get_monitoring_stats_ioctl:2859 (ERR)]: Failed to get target context for uuid /dev/sda Environment Red Hat Enterprise Linux 6 3rd-party kernel module:involflt Subscriber exclusive content ...
Linux-based In-Guest UNMAP support Automatic UNMAP This is something that was once in existence back in ESXi 5.0, but was withdrawn for a variety of reasons. It is finally back! Yay! So let’s talk about what it requires: ESXi 6.5+ vCenter 6.5+ VMFS 6 An array that supports UNMAP ...
Using SPIDEV, this is accomplished by stacking up two SPI driver messages and sending them down using ioctl() calls. The first one sets "cs_change=0" so the CS wont change between #2 and #3 above. That's what's not working. Instead, the CS toggles and the FPGA starts a whole new...
name] def __set__(self, instance, value): if not isinstance(value, int): raise ValueError(f'expecting integer in {self.name}') instance.__dict__[self.name] = value # this is the new initializer: def __set_name__(self, owner, name): self.name = name class Model: int_field =...
The MPxIO path steering feature includes a mechanism for issuing SCSI commands to an MPxIO LU to be delivered down a specified path to the LU. In order to provide this functionality, a newIOCTLcommand,MP_SEND_SCSI_CMD, is added and is referenced through the existingscsi_vhci IOCTLinterface....