So after loader picks which terminal it likes best, it opens it, uses
dup2() to replace its fd (0,1,2) with the new terminal, and then does:
setsid(); ioctl(0, TIOCSCTTY, NULL);
to switch its controlling terminal to the new terminal (on fd 0).

In commit b8886ea3, the code was refactored a bit and the ioctl() got
moved *above* the dup2(), which meant that fd 0 was still the *old*
terminal, so the ioctl() would have no useful effect.

This commit makes ioctl() operate on the correct fd, and changes NULL
to '0' (since ioctl takes an int arg, not a pointer).
---
loader/serial.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/loader/serial.c b/loader/serial.c
index cb8b3ee..40417d6 100644
--- a/loader/serial.c
+++ b/loader/serial.c
@@ -192,7 +192,7 @@ void init_serial(struct termios *orig_cmode, int *orig_flags, GHashTable *cmdlin
}

setsid();
- if (ioctl(0, TIOCSCTTY, NULL))
+ if (ioctl(fd, TIOCSCTTY, 0))
fprintf(stderr, "could not set new controlling tty
");

if (dup2(fd, 0) == -1)
--
1.7.7.3

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