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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> | |
0be0c18d GKH |
26 | #include <sys/socket.h> |
27 | #include <sys/wait.h> | |
28 | #include <sys/un.h> | |
e5a2989e | 29 | #include <time.h> |
7fafc032 KS |
30 | #include <errno.h> |
31 | #include <stdio.h> | |
32 | #include <stdlib.h> | |
1dadabd7 | 33 | #include <stddef.h> |
7fafc032 | 34 | #include <string.h> |
33db4b8d | 35 | #include <unistd.h> |
2f6cbd19 | 36 | #include <linux/stddef.h> |
7fafc032 KS |
37 | |
38 | #include "udev.h" | |
c81b35c0 | 39 | #include "udev_lib.h" |
35b7d88c | 40 | #include "udev_version.h" |
7fafc032 KS |
41 | #include "udevd.h" |
42 | #include "logging.h" | |
43 | ||
d026a35d | 44 | #ifdef LOG |
d00bd172 | 45 | unsigned char logname[LOGNAME_SIZE]; |
d026a35d | 46 | void log_message (int level, const char *format, ...) |
51a8bb2f | 47 | { |
d026a35d GKH |
48 | va_list args; |
49 | ||
50 | va_start(args, format); | |
51 | vsyslog(level, format, args); | |
52 | va_end(args); | |
51a8bb2f | 53 | } |
d026a35d | 54 | #endif |
51a8bb2f | 55 | |
e5a2989e KS |
56 | static void build_hotplugmsg(struct hotplug_msg *msg, char *action, |
57 | char *devpath, char *subsystem, int seqnum) | |
7fafc032 | 58 | { |
e5a2989e | 59 | memset(msg, 0x00, sizeof(struct hotplug_msg)); |
53921bfa | 60 | strfieldcpy(msg->magic, UDEV_MAGIC); |
71c077fb | 61 | msg->seqnum = seqnum; |
c472e3c8 KS |
62 | strfieldcpy(msg->action, action); |
63 | strfieldcpy(msg->devpath, devpath); | |
64 | strfieldcpy(msg->subsystem, subsystem); | |
7fafc032 KS |
65 | } |
66 | ||
33db4b8d KS |
67 | static int start_daemon(void) |
68 | { | |
69 | pid_t pid; | |
70 | pid_t child_pid; | |
71 | ||
72 | pid = fork(); | |
73 | switch (pid) { | |
74 | case 0: | |
75 | /* helper child */ | |
76 | child_pid = fork(); | |
77 | switch (child_pid) { | |
78 | case 0: | |
79 | /* daemon */ | |
a695feae | 80 | setsid(); |
2a25816f | 81 | chdir("/"); |
35b7d88c | 82 | execl(UDEVD_BIN, "udevd", NULL); |
33db4b8d KS |
83 | dbg("exec of daemon failed"); |
84 | exit(1); | |
85 | case -1: | |
86 | dbg("fork of daemon failed"); | |
87 | return -1; | |
88 | default: | |
89 | exit(0); | |
90 | } | |
91 | break; | |
92 | case -1: | |
93 | dbg("fork of helper failed"); | |
94 | return -1; | |
95 | default: | |
a695feae | 96 | wait(NULL); |
33db4b8d KS |
97 | } |
98 | return 0; | |
99 | } | |
100 | ||
28e169f0 KS |
101 | static void run_udev(const char *subsystem) |
102 | { | |
103 | pid_t pid; | |
104 | ||
105 | pid = fork(); | |
106 | switch (pid) { | |
107 | case 0: | |
108 | /* child */ | |
109 | execl(UDEV_BIN, "udev", subsystem, NULL); | |
110 | dbg("exec of child failed"); | |
111 | exit(1); | |
112 | break; | |
113 | case -1: | |
114 | dbg("fork of child failed"); | |
115 | break; | |
116 | default: | |
117 | wait(NULL); | |
118 | } | |
119 | } | |
120 | ||
7fafc032 KS |
121 | int main(int argc, char* argv[]) |
122 | { | |
0028653c | 123 | struct hotplug_msg msg; |
7fafc032 KS |
124 | char *action; |
125 | char *devpath; | |
126 | char *subsystem; | |
127 | char *seqnum; | |
128 | int seq; | |
2f6cbd19 | 129 | int retval = 1; |
33db4b8d KS |
130 | int loop; |
131 | struct timespec tspec; | |
28e169f0 | 132 | int sock = -1; |
53921bfa | 133 | struct sockaddr_un saddr; |
1dadabd7 | 134 | socklen_t addrlen; |
2f6cbd19 | 135 | int started_daemon = 0; |
7fafc032 | 136 | |
95a6f4c8 | 137 | init_logging("udevsend"); |
8bbf2751 | 138 | dbg("version %s", UDEV_VERSION); |
95a6f4c8 | 139 | |
e964c2c0 | 140 | subsystem = get_subsystem(argv[1]); |
7fafc032 KS |
141 | if (subsystem == NULL) { |
142 | dbg("no subsystem"); | |
143 | goto exit; | |
144 | } | |
8bbf2751 | 145 | dbg("subsystem = '%s'", subsystem); |
7fafc032 KS |
146 | |
147 | devpath = get_devpath(); | |
148 | if (devpath == NULL) { | |
149 | dbg("no devpath"); | |
150 | goto exit; | |
151 | } | |
8bbf2751 | 152 | dbg("DEVPATH = '%s'", devpath); |
7fafc032 KS |
153 | |
154 | action = get_action(); | |
155 | if (action == NULL) { | |
156 | dbg("no action"); | |
157 | goto exit; | |
158 | } | |
8bbf2751 | 159 | dbg("ACTION = '%s'", action); |
7fafc032 KS |
160 | |
161 | seqnum = get_seqnum(); | |
86590cd5 | 162 | if (seqnum == NULL) |
2f6cbd19 | 163 | seq = -1; |
86590cd5 KS |
164 | else |
165 | seq = atoi(seqnum); | |
8bbf2751 | 166 | dbg("SEQNUM = '%d'", seq); |
7b15897b | 167 | |
2f6cbd19 | 168 | sock = socket(AF_LOCAL, SOCK_DGRAM, 0); |
53921bfa KS |
169 | if (sock == -1) { |
170 | dbg("error getting socket"); | |
28e169f0 | 171 | goto fallback; |
7fafc032 KS |
172 | } |
173 | ||
e5a2989e | 174 | memset(&saddr, 0x00, sizeof(struct sockaddr_un)); |
53921bfa | 175 | saddr.sun_family = AF_LOCAL; |
872344c4 KS |
176 | /* use abstract namespace for socket path */ |
177 | strcpy(&saddr.sun_path[1], UDEVD_SOCK_PATH); | |
1dadabd7 | 178 | addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(saddr.sun_path+1) + 1; |
53921bfa | 179 | |
e5a2989e | 180 | build_hotplugmsg(&msg, action, devpath, subsystem, seq); |
0028653c | 181 | |
2f6cbd19 KS |
182 | /* If we can't send, try to start daemon and resend message */ |
183 | loop = UDEVSEND_CONNECT_RETRY; | |
184 | while (loop--) { | |
e5a2989e KS |
185 | retval = sendto(sock, &msg, sizeof(struct hotplug_msg), 0, |
186 | (struct sockaddr *)&saddr, addrlen); | |
2f6cbd19 KS |
187 | if (retval != -1) { |
188 | retval = 0; | |
28e169f0 | 189 | goto exit; |
2f6cbd19 | 190 | } |
28e169f0 | 191 | |
2f6cbd19 KS |
192 | if (errno != ECONNREFUSED) { |
193 | dbg("error sending message"); | |
28e169f0 | 194 | goto fallback; |
2f6cbd19 | 195 | } |
28e169f0 | 196 | |
2f6cbd19 | 197 | if (!started_daemon) { |
28e169f0 | 198 | info("starting udevd daemon"); |
2f6cbd19 KS |
199 | retval = start_daemon(); |
200 | if (retval) { | |
28e169f0 KS |
201 | info("error starting daemon"); |
202 | goto fallback; | |
2f6cbd19 | 203 | } |
53921bfa | 204 | dbg("daemon started"); |
2f6cbd19 | 205 | started_daemon = 1; |
53921bfa | 206 | } else { |
2f6cbd19 KS |
207 | dbg("retry to connect %d", UDEVSEND_CONNECT_RETRY - loop); |
208 | tspec.tv_sec = 0; | |
209 | tspec.tv_nsec = 100000000; /* 100 millisec */ | |
210 | nanosleep(&tspec, NULL); | |
53921bfa | 211 | } |
7fafc032 | 212 | } |
28e169f0 KS |
213 | |
214 | fallback: | |
215 | info("unable to connect to event daemon, try to call udev directly"); | |
216 | run_udev(subsystem); | |
217 | ||
33db4b8d | 218 | exit: |
28e169f0 KS |
219 | if (sock != -1) |
220 | close(sock); | |
221 | ||
2f6cbd19 | 222 | return retval; |
7fafc032 | 223 | } |