r0 = openat$ptmx(0xffffffffffffff9c, &(0x7f0000000000), 0x0, 0x0)
ioctl$TIOCGPGRP(r0, 0x5412, &(0x7f0000000040))
read(r0, &(0x7f0000000080)=""/4096, 0x1000)