6 * Copyright (C) 2004 Ling, Xiaofeng <xiaofeng.ling@intel.com>
7 * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
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.
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.
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.
25 #include <sys/types.h>
26 #include <sys/socket.h>
36 #include <linux/stddef.h>
40 #include "udev_version.h"
44 /* global variables */
48 unsigned char logname[LOGNAME_SIZE];
49 void log_message (int level, const char *format, ...)
53 va_start(args, format);
54 vsyslog(level, format, args);
59 static int start_daemon(void)
73 execl(UDEVD_BIN, "udevd", NULL);
74 dbg("exec of daemon failed");
77 dbg("fork of daemon failed");
84 dbg("fork of helper failed");
87 waitpid(pid, NULL, 0);
92 static void run_udev(const char *subsystem)
100 execl(UDEV_BIN, "udev", subsystem, NULL);
101 dbg("exec of child failed");
105 dbg("fork of child failed");
108 waitpid(pid, NULL, 0);
112 int main(int argc, char *argv[], char *envp[])
114 static struct udevsend_msg usend_msg;
118 struct sockaddr_un saddr;
120 const char *subsystem_argv;
121 int subsystem_env = 0;
124 int started_daemon = 0;
126 logging_init("udevsend");
127 dbg("version %s", UDEV_VERSION);
129 subsystem_argv = argv[1];
130 if (subsystem_argv == NULL) {
135 sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
137 dbg("error getting socket");
141 memset(&saddr, 0x00, sizeof(struct sockaddr_un));
142 saddr.sun_family = AF_LOCAL;
143 /* use abstract namespace for socket path */
144 strcpy(&saddr.sun_path[1], UDEVD_SOCK_PATH);
145 addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(saddr.sun_path+1) + 1;
147 memset(&usend_msg, 0x00, sizeof(struct udevsend_msg));
149 strcpy(usend_msg.magic, UDEV_MAGIC);
151 /* copy all keys to send buffer */
152 for (i = 0; envp[i]; i++) {
157 keylen = strlen(key);
158 if (bufpos + keylen >= HOTPLUG_BUFFER_SIZE-1) {
159 dbg("environment buffer too small, probably not called by the kernel");
163 /* older kernels do not have the SUBSYSTEM in the environment */
164 if (strncmp(key, "SUBSYSTEM=", 10) == 0)
167 dbg("add '%s' to env[%i] buffer", key, i);
168 strcpy(&usend_msg.envbuf[bufpos], key);
169 bufpos += keylen + 1;
171 if (!subsystem_env) {
172 bufpos += sprintf(&usend_msg.envbuf[bufpos], "SUBSYSTEM=%s", subsystem_argv) + 1;
173 dbg("add 'SUBSYSTEM=%s' to env[%i] buffer from argv", subsystem_argv, i);
176 usend_msg_len = offsetof(struct udevsend_msg, envbuf) + bufpos;
177 dbg("usend_msg_len=%i", usend_msg_len);
179 /* If we can't send, try to start daemon and resend message */
180 loop = SEND_WAIT_MAX_SECONDS * SEND_WAIT_LOOP_PER_SECOND;
182 retval = sendto(sock, &usend_msg, usend_msg_len, 0, (struct sockaddr *)&saddr, addrlen);
188 if (errno != ECONNREFUSED) {
189 dbg("error sending message (%s)", strerror(errno));
193 if (!started_daemon) {
194 dbg("try to start udevd daemon");
195 retval = start_daemon();
197 info("error starting daemon");
200 info("udevd daemon started");
203 dbg("retry to connect %d", SEND_WAIT_MAX_SECONDS * SEND_WAIT_LOOP_PER_SECOND - loop);
204 usleep(1000 * 1000 / SEND_WAIT_LOOP_PER_SECOND);
209 info("unable to connect to event daemon, try to call udev directly");
210 run_udev(subsystem_argv);