xref: /qemu/linux-user/fd-trans.h (revision f7e6a401fe3313e6d7dd0c56aa660e684f08e657)
1*f7e6a401SLaurent Vivier /*
2*f7e6a401SLaurent Vivier  *  This program is free software; you can redistribute it and/or modify
3*f7e6a401SLaurent Vivier  *  it under the terms of the GNU General Public License as published by
4*f7e6a401SLaurent Vivier  *  the Free Software Foundation; either version 2 of the License, or
5*f7e6a401SLaurent Vivier  *  (at your option) any later version.
6*f7e6a401SLaurent Vivier  *
7*f7e6a401SLaurent Vivier  *  This program is distributed in the hope that it will be useful,
8*f7e6a401SLaurent Vivier  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
9*f7e6a401SLaurent Vivier  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
10*f7e6a401SLaurent Vivier  *  GNU General Public License for more details.
11*f7e6a401SLaurent Vivier  *
12*f7e6a401SLaurent Vivier  *  You should have received a copy of the GNU General Public License
13*f7e6a401SLaurent Vivier  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
14*f7e6a401SLaurent Vivier  */
15*f7e6a401SLaurent Vivier 
16*f7e6a401SLaurent Vivier #ifndef FD_TRANS_H
17*f7e6a401SLaurent Vivier #define FD_TRANS_H
18*f7e6a401SLaurent Vivier 
19*f7e6a401SLaurent Vivier typedef abi_long (*TargetFdDataFunc)(void *, size_t);
20*f7e6a401SLaurent Vivier typedef abi_long (*TargetFdAddrFunc)(void *, abi_ulong, socklen_t);
21*f7e6a401SLaurent Vivier typedef struct TargetFdTrans {
22*f7e6a401SLaurent Vivier     TargetFdDataFunc host_to_target_data;
23*f7e6a401SLaurent Vivier     TargetFdDataFunc target_to_host_data;
24*f7e6a401SLaurent Vivier     TargetFdAddrFunc target_to_host_addr;
25*f7e6a401SLaurent Vivier } TargetFdTrans;
26*f7e6a401SLaurent Vivier 
27*f7e6a401SLaurent Vivier extern TargetFdTrans **target_fd_trans;
28*f7e6a401SLaurent Vivier 
29*f7e6a401SLaurent Vivier extern unsigned int target_fd_max;
30*f7e6a401SLaurent Vivier 
31*f7e6a401SLaurent Vivier static inline TargetFdDataFunc fd_trans_target_to_host_data(int fd)
32*f7e6a401SLaurent Vivier {
33*f7e6a401SLaurent Vivier     if (fd >= 0 && fd < target_fd_max && target_fd_trans[fd]) {
34*f7e6a401SLaurent Vivier         return target_fd_trans[fd]->target_to_host_data;
35*f7e6a401SLaurent Vivier     }
36*f7e6a401SLaurent Vivier     return NULL;
37*f7e6a401SLaurent Vivier }
38*f7e6a401SLaurent Vivier 
39*f7e6a401SLaurent Vivier static inline TargetFdDataFunc fd_trans_host_to_target_data(int fd)
40*f7e6a401SLaurent Vivier {
41*f7e6a401SLaurent Vivier     if (fd >= 0 && fd < target_fd_max && target_fd_trans[fd]) {
42*f7e6a401SLaurent Vivier         return target_fd_trans[fd]->host_to_target_data;
43*f7e6a401SLaurent Vivier     }
44*f7e6a401SLaurent Vivier     return NULL;
45*f7e6a401SLaurent Vivier }
46*f7e6a401SLaurent Vivier 
47*f7e6a401SLaurent Vivier static inline TargetFdAddrFunc fd_trans_target_to_host_addr(int fd)
48*f7e6a401SLaurent Vivier {
49*f7e6a401SLaurent Vivier     if (fd >= 0 && fd < target_fd_max && target_fd_trans[fd]) {
50*f7e6a401SLaurent Vivier         return target_fd_trans[fd]->target_to_host_addr;
51*f7e6a401SLaurent Vivier     }
52*f7e6a401SLaurent Vivier     return NULL;
53*f7e6a401SLaurent Vivier }
54*f7e6a401SLaurent Vivier 
55*f7e6a401SLaurent Vivier static inline void fd_trans_register(int fd, TargetFdTrans *trans)
56*f7e6a401SLaurent Vivier {
57*f7e6a401SLaurent Vivier     unsigned int oldmax;
58*f7e6a401SLaurent Vivier 
59*f7e6a401SLaurent Vivier     if (fd >= target_fd_max) {
60*f7e6a401SLaurent Vivier         oldmax = target_fd_max;
61*f7e6a401SLaurent Vivier         target_fd_max = ((fd >> 6) + 1) << 6; /* by slice of 64 entries */
62*f7e6a401SLaurent Vivier         target_fd_trans = g_renew(TargetFdTrans *,
63*f7e6a401SLaurent Vivier                                   target_fd_trans, target_fd_max);
64*f7e6a401SLaurent Vivier         memset((void *)(target_fd_trans + oldmax), 0,
65*f7e6a401SLaurent Vivier                (target_fd_max - oldmax) * sizeof(TargetFdTrans *));
66*f7e6a401SLaurent Vivier     }
67*f7e6a401SLaurent Vivier     target_fd_trans[fd] = trans;
68*f7e6a401SLaurent Vivier }
69*f7e6a401SLaurent Vivier 
70*f7e6a401SLaurent Vivier static inline void fd_trans_unregister(int fd)
71*f7e6a401SLaurent Vivier {
72*f7e6a401SLaurent Vivier     if (fd >= 0 && fd < target_fd_max) {
73*f7e6a401SLaurent Vivier         target_fd_trans[fd] = NULL;
74*f7e6a401SLaurent Vivier     }
75*f7e6a401SLaurent Vivier }
76*f7e6a401SLaurent Vivier 
77*f7e6a401SLaurent Vivier static inline void fd_trans_dup(int oldfd, int newfd)
78*f7e6a401SLaurent Vivier {
79*f7e6a401SLaurent Vivier     fd_trans_unregister(newfd);
80*f7e6a401SLaurent Vivier     if (oldfd < target_fd_max && target_fd_trans[oldfd]) {
81*f7e6a401SLaurent Vivier         fd_trans_register(newfd, target_fd_trans[oldfd]);
82*f7e6a401SLaurent Vivier     }
83*f7e6a401SLaurent Vivier }
84*f7e6a401SLaurent Vivier 
85*f7e6a401SLaurent Vivier extern TargetFdTrans target_packet_trans;
86*f7e6a401SLaurent Vivier #ifdef CONFIG_RTNETLINK
87*f7e6a401SLaurent Vivier extern TargetFdTrans target_netlink_route_trans;
88*f7e6a401SLaurent Vivier #endif
89*f7e6a401SLaurent Vivier extern TargetFdTrans target_netlink_audit_trans;
90*f7e6a401SLaurent Vivier extern TargetFdTrans target_signalfd_trans;
91*f7e6a401SLaurent Vivier extern TargetFdTrans target_eventfd_trans;
92*f7e6a401SLaurent Vivier #if (defined(TARGET_NR_inotify_init) && defined(__NR_inotify_init)) || \
93*f7e6a401SLaurent Vivier     (defined(CONFIG_INOTIFY1) && defined(TARGET_NR_inotify_init1) && \
94*f7e6a401SLaurent Vivier      defined(__NR_inotify_init1))
95*f7e6a401SLaurent Vivier extern TargetFdTrans target_inotify_trans;
96*f7e6a401SLaurent Vivier #endif
97*f7e6a401SLaurent Vivier #endif
98