blob: cae2feac0ce1e5fcdce110855917005a8e4756f9 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
|
/* Copyright (C) 1997, 1999 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <errno.h>
#include <termios.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <unistd.h>
libc_hidden_proto(ioctl)
libc_hidden_proto(getsid)
libc_hidden_proto(tcgetpgrp)
/* Return the session ID of FD. */
pid_t tcgetsid (int fd)
{
pid_t pgrp;
pid_t sid;
#ifdef TIOCGSID
static int tiocgsid_does_not_work;
if (! tiocgsid_does_not_work)
{
int serrno = errno;
int sid;
if (ioctl (fd, TIOCGSID, &sid) < 0)
{
if (errno == EINVAL)
{
tiocgsid_does_not_work = 1;
__set_errno(serrno);
}
else
return (pid_t) -1;
}
else
return (pid_t) sid;
}
#endif
pgrp = tcgetpgrp (fd);
if (pgrp == -1)
return (pid_t) -1;
sid = getsid (pgrp);
if (sid == -1 && errno == ESRCH)
__set_errno(ENOTTY);
return sid;
}
|
