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7fafc032 KS |
1 | /* |
2 | * udevsend.c | |
3 | * | |
4 | * Userspace devfs | |
5 | * | |
6 | * Copyright (C) 2004 Ling, Xiaofeng <xiaofeng.ling@intel.com> | |
7 | * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org> | |
8 | * | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify it | |
11 | * under the terms of the GNU General Public License as published by the | |
12 | * Free Software Foundation version 2 of the License. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, but | |
15 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License along | |
20 | * with this program; if not, write to the Free Software Foundation, Inc., | |
21 | * 675 Mass Ave, Cambridge, MA 02139, USA. | |
22 | * | |
23 | */ | |
24 | ||
25 | #include <sys/types.h> | |
26 | #include <sys/ipc.h> | |
27 | #include <sys/msg.h> | |
28 | #include <errno.h> | |
29 | #include <stdio.h> | |
30 | #include <stdlib.h> | |
31 | #include <string.h> | |
32 | ||
33 | #include "udev.h" | |
34 | #include "udevd.h" | |
35 | #include "logging.h" | |
36 | ||
37 | static inline char *get_action(void) | |
38 | { | |
39 | char *action; | |
40 | ||
41 | action = getenv("ACTION"); | |
42 | return action; | |
43 | } | |
44 | ||
45 | static inline char *get_devpath(void) | |
46 | { | |
47 | char *devpath; | |
48 | ||
49 | devpath = getenv("DEVPATH"); | |
50 | return devpath; | |
51 | } | |
52 | ||
53 | static inline char *get_seqnum(void) | |
54 | { | |
55 | char *seqnum; | |
56 | ||
57 | seqnum = getenv("SEQNUM"); | |
58 | return seqnum; | |
59 | } | |
60 | ||
61 | static int build_hotplugmsg(struct hotplug_msg **ppmsg, char *action, | |
62 | char *devpath, char *subsystem, int seqnum) | |
63 | { | |
64 | struct hotplug_msg *pmsg; | |
65 | ||
66 | pmsg = malloc(sizeof(struct hotplug_msg)); | |
67 | pmsg->mtype = HOTPLUGMSGTYPE; | |
68 | pmsg->seqnum = seqnum; | |
69 | strncpy(pmsg->action, action, 8); | |
70 | strncpy(pmsg->devpath, devpath, 128); | |
71 | strncpy(pmsg->subsystem, subsystem, 16); | |
72 | *ppmsg = pmsg; | |
73 | return sizeof(struct hotplug_msg); | |
74 | } | |
75 | ||
76 | static void free_hotplugmsg(struct hotplug_msg *pmsg) | |
77 | { | |
78 | free(pmsg); | |
79 | } | |
80 | ||
81 | int main(int argc, char* argv[]) | |
82 | { | |
83 | int msgid; | |
84 | key_t key; | |
85 | struct msqid_ds msg_queue; | |
86 | struct msgbuf *pmsg; | |
87 | char *action; | |
88 | char *devpath; | |
89 | char *subsystem; | |
90 | char *seqnum; | |
91 | int seq; | |
92 | int retval = -EINVAL; | |
93 | int size; | |
94 | ||
95 | subsystem = argv[1]; | |
96 | if (subsystem == NULL) { | |
97 | dbg("no subsystem"); | |
98 | goto exit; | |
99 | } | |
100 | ||
101 | devpath = get_devpath(); | |
102 | if (devpath == NULL) { | |
103 | dbg("no devpath"); | |
104 | goto exit; | |
105 | } | |
106 | ||
107 | action = get_action(); | |
108 | if (action == NULL) { | |
109 | dbg("no action"); | |
110 | goto exit; | |
111 | } | |
112 | ||
113 | seqnum = get_seqnum(); | |
114 | if (seqnum == NULL) { | |
115 | dbg("no seqnum"); | |
116 | goto exit; | |
117 | } | |
118 | ||
119 | seq = atoi(seqnum); | |
120 | key = ftok(DEFAULT_EXEC_PROGRAM, IPC_KEY_ID); | |
121 | size = build_hotplugmsg( (struct hotplug_msg**) &pmsg, action, devpath, subsystem, seq); | |
122 | msgid = msgget(key, IPC_CREAT); | |
123 | if (msgid == -1) | |
124 | { | |
125 | dbg("open ipc queue error"); | |
126 | goto exit; | |
127 | } | |
128 | ||
129 | /* get state of queue */ | |
130 | retval = msgctl(msgid, IPC_STAT, &msg_queue); | |
131 | if (retval == -1) { | |
132 | dbg("error getting info on ipc queue"); | |
133 | goto exit; | |
134 | } | |
135 | if (msg_queue.msg_qnum > 0) | |
136 | dbg("%li messages already in the ipc queue", msg_queue.msg_qnum); | |
137 | ||
138 | retval = msgsnd(msgid, pmsg, size, 0); | |
139 | free_hotplugmsg( (struct hotplug_msg*) pmsg); | |
140 | if (retval == -1) | |
141 | { | |
142 | dbg("send ipc message error"); | |
143 | goto exit; | |
144 | } | |
145 | return 0; | |
146 | ||
147 | exit: | |
148 | if (retval > 0) | |
149 | retval = 0; | |
150 | ||
151 | return retval; | |
152 | } |