/var/mod/root $ strace -p 3240
Process 3240 attached - interrupt to quit
read(0, "e", 1)                         = 1
write(1, "e", 1)                        = 1
read(0, "x", 1)                         = 1
write(1, "x", 1)                        = 1
read(0, "i", 1)                         = 1
write(1, "i", 1)                        = 1
read(0, "t", 1)                         = 1
write(1, "t", 1)                        = 1
read(0, "\n", 1)                        = 1
write(1, "\n", 1)                       = 1
ioctl(0, TIOCSCTTY, {B38400 opost isig icanon echo ...}) = 0
ioctl(0, TIOCNXCL, {B38400 opost isig icanon echo ...}) = 0
rt_sigaction(SIGWINCH, {0x10000000, [], 0}, {0x10000000, [], 0x46ecd4 /* SA_??? */}, 16) = 0
ioctl(10, 0x80047476, 0x7fdabe9c)       = 0
setpgid(0, 3240)                        = -1 EPERM (Operation not permitted)
close(10)                               = 0
exit(0)                                 = ?
Process 3240 detached