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login_tty: Rewrite following FreeBSD's traces 

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen 2016-11-24 12:06:29 +01:00
parent b56179f83a
commit d3becf4318
1 changed files with 8 additions and 15 deletions
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23
winsup/cygwin/libc/bsdlib.cc
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@ -77,22 +77,15 @@ daemon (int nochdir, int noclose)
extern "C" int
login_tty (int fd)
{
char *fdname;
int newfd;
if (setsid () == -1)
/* If setsid fails, FreeBSD uses the current sid returned by getsid(0),
then calls tcsetsid, which we don't provide (just as Linux doesn't).
tcsetsid only uses the sid to check against the value returned by
getsid(0). So, either way, that check will not fail and we can
simply ignore the return value from setsid and just perform the
ioctl call tcsetsid does. */
setsid ();
if (ioctl (fd, TIOCSCTTY, NULL) == -1)
return -1;
if ((fdname = ttyname (fd)))
{
if (fd != STDIN_FILENO)
close (STDIN_FILENO);
if (fd != STDOUT_FILENO)
close (STDOUT_FILENO);
if (fd != STDERR_FILENO)
close (STDERR_FILENO);
newfd = open (fdname, O_RDWR);
close (newfd);
}
dup2 (fd, STDIN_FILENO);
dup2 (fd, STDOUT_FILENO);
dup2 (fd, STDERR_FILENO);