What possible reasons could block a virtual terminal on Linux?

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Or is it possible at all that some process or something else could block a virtual terminal? Or what could be a reason that an application hangs when trying to access the VT1?

It seems, while that is happening, it is hanging in the function ioctl. Especially, this is the code which fails:

int vtno = 1;
const char* vtname = "/dev/tty1";

int fd = open(vtname, O_RDWR|O_NDELAY, 0);

if (ioctl(fd, VT_ACTIVATE, vtno) < 0)
  printf("VT_ACTIVATE failed: %s\n", strerror(errno));

if (ioctl(fd, VT_WAITACTIVE, vtno) < 0)
  printf("VT_WAITACTIVE failed: %s\n", strerror(errno));

It hangs in the second ioctl. When I interrupt it, I get this message:

VT_WAITACTIVE failed: Interrupted system call

Also, while it is waiting there, if I do a chvt 1 from another terminal, that also hangs.

задан Peter Mortensen 26 February 2016 в 18:47

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