ioctl( "/dev/hidraw0", TCGETS, …) always fails #255
Description
I want to open a /dev/hidraw0 serial port using new NRSerialPort("/dev/hidraw0", 2400) as everything else has not worked. So once I do
(new NRSerialPort("/dev/hidraw0", 2400)).connect()
under strace, it shows
[pid 9193] stat64("/var/lock/LCK..hidraw0", 0x5f2d00b0) = -1 ENOENT (No such file or directory)
[pid 9193] openat(AT_FDCWD, "/var/lock/LCK..hidraw0", O_WRONLY|O_CREAT|O_EXCL, 0666 ) = 225
[pid 9193] getpid( ) = 7840
[pid 9193] write(225, " 7840\n", 11) = 11
[pid 9193] close(225 ) = 0
[pid 9193] openat(AT_FDCWD, "/dev/hidraw0", O_RDONLY|O_NOCTTY|O_NONBLOCK ) = 225
[pid 9193] getpid( ) = 7840
[pid 9193] fcntl64(225, F_SETOWN, 7840 ) = 0
[pid 9193] fcntl64(225, F_SETFD, 0 ) = 0
[pid 9193] fcntl64(225, F_GETLK , 0x902) = -1 EFAULT (Bad address)
[pid 9193] ioctl(225, TCGETS , 0x5f2d14e8) = -1 EINVAL (Invalid argument)
[pid 9193] openat(AT_FDCWD, "/var/lock/LCK..hidraw0", O_RDONLY ) = 226
[pid 9193] read(226, " 7840\n", 11) = 11
[pid 9193] close(226 ) = 0
[pid 9193] getpid( ) = 7840
[pid 9193] getpid() = 7840
[pid 9193] getppid( ) = 1
[pid 9193] unlink("/var/lock/LCK..hidraw0" ) = 0
[pid 9193] fcntl64(225, F_GETFL) = 0x800 (flags O_RDONLY|O_NONBLOCK)
[pid 9193] close(225) = 0
and connect() returns false. My understanding is that ioctl(, TCGETS, ) is the same as tcgetattr(fd, argp) and this probably does not work on hidraw devices. I event have changed chmod 777 /dev/hidraw0, it dit not help.