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
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
|
/* Copyright (C) 1993, 1994 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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
#include <errno.h>
#include <unistd.h>
#include <hurd.h>
#include <hurd/fd.h>
error_t
_hurd_fd_read (struct hurd_fd *fd, void *buf, size_t *nbytes)
{
error_t err;
char *data;
mach_msg_type_size_t nread;
data = buf;
err = HURD_FD_PORT_USE
(fd,
({
do
{
err = __io_read (ctty != MACH_PORT_NULL ? ctty : port,
&data, &nread, -1, *nbytes);
if (ctty != MACH_PORT_NULL && err == EBACKGROUND)
{
/* We are a background job and tried to read from the tty.
We should probably get a SIGTTIN signal. */
struct hurd_sigstate *ss;
if (_hurd_orphaned)
/* Our process group is orphaned. Don't stop; just fail. */
err = EIO;
else
{
ss = _hurd_self_sigstate ();
if (__sigismember (&ss->blocked, SIGTTIN) ||
ss->actions[SIGTTIN].sa_handler == SIG_IGN)
/* We are blocking or ignoring SIGTTIN. Just fail. */
err = EIO;
__mutex_unlock (&ss->lock);
}
if (err == EBACKGROUND)
{
/* Send a SIGTTIN signal to our process group. */
err = __USEPORT (CTTYID, _hurd_sig_post (0, SIGTTIN, port));
/* XXX what to do if error here? */
/* At this point we should have just run the handler for
SIGTTIN or resumed after being stopped. Now this is
still a "system call", so check to see if we should
restart it. */
__mutex_lock (&ss->lock);
if (!(ss->actions[SIGTTIN].sa_flags & SA_RESTART))
err = EINTR;
__mutex_unlock (&ss->lock);
}
}
} while (err == EBACKGROUND);
err;
}));
if (err)
return err;
if (data != buf)
{
memcpy (buf, data, nread);
__vm_deallocate (__mach_task_self (), (vm_address_t) data, nread);
}
*nbytes = nread;
return 0;
}
|
