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check_dev_tty - What does it do?
From: |
John Carter |
Subject: |
check_dev_tty - What does it do? |
Date: |
Fri, 23 Jun 2006 14:54:04 +1200 (NZST) |
Here is the bash-3.1 code from general.c for check_dev_tty.
It is invoked shortly after main...
void
check_dev_tty ()
{
int tty_fd;
char *tty;
tty_fd = open ("/dev/tty", O_RDWR|O_NONBLOCK);
if (tty_fd < 0)
{
tty = (char *)ttyname (fileno (stdin));
if (tty == 0)
return;
tty_fd = open (tty, O_RDWR|O_NONBLOCK);
}
close (tty_fd);
}
It seems to open and close /dev/tty and return nothing.
This seems very strange to me.
Why is it doing this?
John Carter Phone : (64)(3) 358 6639
Tait Electronics Fax : (64)(3) 359 4632
PO Box 1645 Christchurch Email : john.carter@tait.co.nz
New Zealand
Carter's Clarification of Murphy's Law.
"Things only ever go right so that they may go more spectacularly wrong later."
From this principle, all of life and physics may be deduced.
- check_dev_tty - What does it do?,
John Carter <=