1 /*
2 * This library is free software; you can redistribute it and/or
3 * modify it under the terms of the GNU Lesser General Public
4 * License as published by the Free Software Foundation;
5 * version 2.1 of the License.
6 *
7 * This library is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
10 * Lesser General Public License for more details.
11 *
12 * You should have received a copy of the GNU Lesser General Public
13 * License along with this library; If not, see <http://www.gnu.org/licenses/>.
14 */
15
16 #include <errno.h>
17 #include <unistd.h>
18 #include <stdlib.h>
19
20 #include "private.h"
21
all_restrict_cb(Xentoolcore__Active_Handle * ah,domid_t domid)22 static int all_restrict_cb(Xentoolcore__Active_Handle *ah, domid_t domid)
23 {
24 xenevtchn_handle *xce = CONTAINER_OF(ah, *xce, tc_ah);
25
26 if ( xce->fd < 0 )
27 /* just in case */
28 return 0;
29
30 return xenevtchn_restrict(xce, domid);
31 }
32
xenevtchn_alloc_handle(xentoollog_logger * logger)33 static xenevtchn_handle *xenevtchn_alloc_handle(xentoollog_logger *logger)
34 {
35 xenevtchn_handle *xce = malloc(sizeof(*xce));
36
37 if ( !xce )
38 return NULL;
39
40 xce->fd = -1;
41 xce->logger = logger;
42 xce->logger_tofree = NULL;
43
44 xce->tc_ah.restrict_callback = all_restrict_cb;
45 xentoolcore__register_active_handle(&xce->tc_ah);
46
47 if ( !xce->logger )
48 {
49 xce->logger = xce->logger_tofree = (xentoollog_logger *)
50 xtl_createlogger_stdiostream(stderr, XTL_PROGRESS, 0);
51 if ( !xce->logger )
52 goto err;
53 }
54
55 return xce;
56
57 err:
58 xenevtchn_close(xce);
59 return NULL;
60 }
61
xenevtchn_open(xentoollog_logger * logger,unsigned int flags)62 xenevtchn_handle *xenevtchn_open(xentoollog_logger *logger, unsigned int flags)
63 {
64 xenevtchn_handle *xce;
65 int rc;
66
67 if ( flags & ~XENEVTCHN_NO_CLOEXEC )
68 {
69 errno = EINVAL;
70 return NULL;
71 }
72
73 xce = xenevtchn_alloc_handle(logger);
74 if ( !xce )
75 return NULL;
76
77 rc = osdep_evtchn_open(xce, flags);
78 if ( rc < 0 )
79 goto err;
80
81 return xce;
82
83 err:
84 xenevtchn_close(xce);
85 return NULL;
86 }
87
xenevtchn_fdopen(struct xentoollog_logger * logger,int fd,unsigned int flags)88 xenevtchn_handle *xenevtchn_fdopen(struct xentoollog_logger *logger,
89 int fd, unsigned int flags)
90 {
91 xenevtchn_handle *xce;
92
93 if ( flags )
94 {
95 errno = EINVAL;
96 return NULL;
97 }
98
99 xce = xenevtchn_alloc_handle(logger);
100 if ( !xce )
101 return NULL;
102
103 xce->fd = fd;
104
105 return xce;
106 }
107
xenevtchn_close(xenevtchn_handle * xce)108 int xenevtchn_close(xenevtchn_handle *xce)
109 {
110 int rc;
111
112 if ( !xce )
113 return 0;
114
115 xentoolcore__deregister_active_handle(&xce->tc_ah);
116 rc = osdep_evtchn_close(xce);
117 xtl_logger_destroy(xce->logger_tofree);
118 free(xce);
119
120 return rc;
121 }
122
xenevtchn_fd(xenevtchn_handle * xce)123 int xenevtchn_fd(xenevtchn_handle *xce)
124 {
125 return xce->fd;
126 }
127
xenevtchn_restrict(xenevtchn_handle * xce,domid_t domid)128 int xenevtchn_restrict(xenevtchn_handle *xce, domid_t domid)
129 {
130 return osdep_evtchn_restrict(xce, domid);
131 }
132
133 /*
134 * Local variables:
135 * mode: C
136 * c-file-style: "BSD"
137 * c-basic-offset: 4
138 * tab-width: 4
139 * indent-tabs-mode: nil
140 * End:
141 */
142