Web19 okt. 2024 · res = ioctl (spiDev, SPI_IOC_MESSAGE (1), &xfer); printf ("SPI result: %d\n", res); The Init part of the code works without error or bad return value. In the loop the "ioctl" returns a -1 and i dont see a clock or mosi pulses like on the linux shell. The c++ Code runs as root. Somebody an idea why it will not work out of the c++ code ? jmyreen Web5 apr. 2024 · return -1; } if (S_ISBLK(st.st_mode)) { unsigned long long bytes; if (ioctl(fd, BLKGETSIZE64, &bytes) != 0) { perror("ioctl"); return -1; } return bytes; } else if (S_ISREG(st.st_mode)) return st.st_size; return -1; } /* * Output a string of characters of len length to stdout. * We use buffered output here to be efficient,
[PATCH v2 18/27] compat_ioctl: scsi: move ioctl handling into …
Web1. V4L2_CAP_HW_FREQ_SEEK. 0x00000400. The device supports the ioctl VIDIOC_S_HW_FREQ_SEEK ioctl for hardware frequency seeking. V4L2_CAP_RDS_OUTPUT. 0x00000800. The device supports the RDS output interface. V4L2_CAP_TUNER. 0x00010000. The device has some sort of tuner to receive RF … WebAt return, if no errors happen, this ioctl will return the topology_version and the total number of entities, interfaces, pads and links. Before the second call, the userspace should allocate arrays to store the graph elements that are desired, putting the pointers to them at the ptr_entities, ptr_interfaces, ptr_links and/or ptr_pads, keeping the other values … open hdf file in r
3.2.18. ioctl DMX_EXPBUF — The Linux Kernel documentation
Web5 okt. 2024 · Create IOCTL Command in the Driver To implement a new ioctl command we need to follow the following steps. 1. Define the ioctl command #define "ioctl name" __IOX ("magic number","command number","argument type") where IOX can be : “ IO “: an ioctl with no parameters “ IOW “: an ioctl with write parameters (copy_from_user) http://www.verycomputer.com/183_fa1b6e5fb34c28d3_1.htm WebThe scsi_cmd_ioctl() and scsi_cmd_blk_ioctl() functions are compatible at this point, so any driver that calls those can do so for both native and compat mode, with the argument passed through compat_ptr(). With this, we can remove the entries from fs/compat_ioctl.c. iowa state pep rally