--- /dev/null
+/*
+ * udevd.c
+ *
+ * Userspace devfs
+ *
+ * Copyright (C) 2004 Ling, Xiaofeng <xiaofeng.ling@intel.com>
+ * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
+ *
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include <sys/types.h>
+#include <sys/ipc.h>
+#include <sys/msg.h>
+#include <signal.h>
+#include <unistd.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "udev.h"
+#include "udevd.h"
+#include "logging.h"
+
+#define BUFFER_SIZE 1024
+#define TIMEOUT_SECONDS 10
+
+static void reset_timer(void);
+static void reset_queue(void);
+
+
+static int expect_seqnum = 0;
+static int timeout_value = TIMEOUT_SECONDS;
+static int timeout = 0;
+static struct hotplug_msg *head = NULL;
+static char exec_program[100];
+
+static void sig_handler(int signum)
+{
+ dbg("caught signal %d", signum);
+ switch (signum) {
+ case SIGHUP:
+ dbg("reset requested, all waiting events killed");
+ reset_timer();
+ reset_queue();
+ timeout = 0;
+ expect_seqnum = 0;
+ break;
+
+ case SIGINT:
+ case SIGTERM:
+ case SIGKILL:
+ exit(20 + signum);
+ break;
+
+ default:
+ dbg("unhandled signal");
+ }
+}
+
+static void sig_alarmhandler(int signum)
+{
+ dbg("caught signal %d", signum);
+ switch (signum) {
+ case SIGALRM:
+ timeout = 1;
+ dbg("event timeout reached");
+ break;
+
+ default:
+ dbg("unhandled signal");
+ }
+}
+
+static void dump_queue(void)
+{
+ struct hotplug_msg *p;
+ p = head;
+
+ dbg("next expected sequence is %d", expect_seqnum);
+ while(p) {
+ dbg("sequence %d in queue", p->seqnum);
+ p=p->next;
+ }
+}
+
+static void dump_msg(struct hotplug_msg *pmsg)
+{
+ dbg("sequence %d, '%s', '%s', '%s'",
+ pmsg->seqnum, pmsg->action, pmsg->devpath, pmsg->subsystem);
+}
+
+static void dispatch_msg(struct hotplug_msg *pmsg)
+{
+ dump_msg(pmsg);
+ dbg("exec '%s'", exec_program);
+ setenv("ACTION", pmsg->action, 1);
+ setenv("DEVPATH", pmsg->devpath, 1);
+ execl(exec_program, pmsg->subsystem);
+}
+
+static void reset_timer(void)
+{
+ alarm(0);
+}
+
+static void set_timer(void)
+{
+ signal(SIGALRM, sig_alarmhandler);
+ alarm(timeout_value);
+}
+
+static void reset_queue(void)
+{
+ struct hotplug_msg *p;
+ p = head;
+
+ while(head) {
+ p = head;
+ head = head->next;
+ free(p);
+ }
+}
+
+static void check_queue(void)
+{
+ struct hotplug_msg *p;
+ p = head;
+
+ dump_queue();
+ while(head && head->seqnum == expect_seqnum) {
+ dispatch_msg(head);
+ expect_seqnum++;
+ p = head;
+ head = head->next;
+ free(p);
+ }
+ if (head != NULL)
+ set_timer();
+ else
+ reset_timer();
+}
+
+static void add_queue(struct hotplug_msg *pmsg)
+{
+ struct hotplug_msg *pnewmsg;
+ struct hotplug_msg *p;
+ struct hotplug_msg *p1;
+
+ p = head;
+ p1 = NULL;
+ pnewmsg = malloc(sizeof(struct hotplug_msg));
+ *pnewmsg = *pmsg;
+ pnewmsg->next = NULL;
+ while(p && pmsg->seqnum > p->seqnum) {
+ p1 = p;
+ p = p->next;
+ }
+ pnewmsg->next = p;
+ if (p1 == NULL) {
+ head = pnewmsg;
+ } else {
+ p1->next = pnewmsg;
+ }
+ dump_queue();
+}
+
+static int process_queue(void)
+{
+ int msgid;
+ key_t key;
+ struct hotplug_msg *pmsg;
+ char buf[BUFFER_SIZE];
+ int ret;
+
+ key = ftok(DEFAULT_EXEC_PROGRAM, IPC_KEY_ID);
+ pmsg = (struct hotplug_msg *) buf;
+ msgid = msgget(key, IPC_CREAT);
+ if (msgid == -1) {
+ dbg("open message queue error");
+ goto exit;
+ }
+ while (1) {
+ ret = msgrcv(msgid, (struct msgbuf *) buf, BUFFER_SIZE-4, HOTPLUGMSGTYPE, 0);
+ if (ret != -1) {
+ dbg("current sequence %d, expected sequence %d", pmsg->seqnum, expect_seqnum);
+
+ /* init expected sequence with value from first call */
+ if (expect_seqnum == 0) {
+ expect_seqnum = pmsg->seqnum;
+ dbg("init next expected sequence number to %d", expect_seqnum);
+ }
+
+ if (pmsg->seqnum > expect_seqnum) {
+ add_queue(pmsg);
+ set_timer();
+ } else {
+ if (pmsg->seqnum == expect_seqnum) {
+ dispatch_msg(pmsg);
+ expect_seqnum++;
+ check_queue();
+ } else {
+ dbg("timeout event for unexpected sequence number %d", pmsg->seqnum);
+ }
+ }
+ } else
+ if (errno == EINTR) {
+ if (head != NULL) {
+ /* timeout, skip all missing, proceed with next queued event */
+ dbg("timeout reached, skip events %d - %d", expect_seqnum, head->seqnum-1);
+ expect_seqnum = head->seqnum;
+ }
+ check_queue();
+ timeout = 0;
+ } else {
+ dbg("ipc message receive error '%s'", strerror(errno));
+ }
+ }
+ return 0;
+exit:
+ return -1;
+}
+
+int main(int argc, char *argv[])
+{
+ /* get program to exec on events */
+ if (argc == 2)
+ strncpy(exec_program, argv[1], sizeof(exec_program));
+ else
+ strcpy(exec_program, DEFAULT_EXEC_PROGRAM);
+
+ /* set up signal handler */
+ signal(SIGINT, sig_handler);
+ signal(SIGTERM, sig_handler);
+ signal(SIGKILL, sig_handler);
+ signal(SIGHUP, sig_handler);
+
+ /* main loop */
+ process_queue();
+ return 0;
+}
--- /dev/null
+/*
+ * udevsend.c
+ *
+ * Userspace devfs
+ *
+ * Copyright (C) 2004 Ling, Xiaofeng <xiaofeng.ling@intel.com>
+ * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
+ *
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include <sys/types.h>
+#include <sys/ipc.h>
+#include <sys/msg.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "udev.h"
+#include "udevd.h"
+#include "logging.h"
+
+static inline char *get_action(void)
+{
+ char *action;
+
+ action = getenv("ACTION");
+ return action;
+}
+
+static inline char *get_devpath(void)
+{
+ char *devpath;
+
+ devpath = getenv("DEVPATH");
+ return devpath;
+}
+
+static inline char *get_seqnum(void)
+{
+ char *seqnum;
+
+ seqnum = getenv("SEQNUM");
+ return seqnum;
+}
+
+static int build_hotplugmsg(struct hotplug_msg **ppmsg, char *action,
+ char *devpath, char *subsystem, int seqnum)
+{
+ struct hotplug_msg *pmsg;
+
+ pmsg = malloc(sizeof(struct hotplug_msg));
+ pmsg->mtype = HOTPLUGMSGTYPE;
+ pmsg->seqnum = seqnum;
+ strncpy(pmsg->action, action, 8);
+ strncpy(pmsg->devpath, devpath, 128);
+ strncpy(pmsg->subsystem, subsystem, 16);
+ *ppmsg = pmsg;
+ return sizeof(struct hotplug_msg);
+}
+
+static void free_hotplugmsg(struct hotplug_msg *pmsg)
+{
+ free(pmsg);
+}
+
+int main(int argc, char* argv[])
+{
+ int msgid;
+ key_t key;
+ struct msqid_ds msg_queue;
+ struct msgbuf *pmsg;
+ char *action;
+ char *devpath;
+ char *subsystem;
+ char *seqnum;
+ int seq;
+ int retval = -EINVAL;
+ int size;
+
+ subsystem = argv[1];
+ if (subsystem == NULL) {
+ dbg("no subsystem");
+ goto exit;
+ }
+
+ devpath = get_devpath();
+ if (devpath == NULL) {
+ dbg("no devpath");
+ goto exit;
+ }
+
+ action = get_action();
+ if (action == NULL) {
+ dbg("no action");
+ goto exit;
+ }
+
+ seqnum = get_seqnum();
+ if (seqnum == NULL) {
+ dbg("no seqnum");
+ goto exit;
+ }
+
+ seq = atoi(seqnum);
+ key = ftok(DEFAULT_EXEC_PROGRAM, IPC_KEY_ID);
+ size = build_hotplugmsg( (struct hotplug_msg**) &pmsg, action, devpath, subsystem, seq);
+ msgid = msgget(key, IPC_CREAT);
+ if (msgid == -1)
+ {
+ dbg("open ipc queue error");
+ goto exit;
+ }
+
+ /* get state of queue */
+ retval = msgctl(msgid, IPC_STAT, &msg_queue);
+ if (retval == -1) {
+ dbg("error getting info on ipc queue");
+ goto exit;
+ }
+ if (msg_queue.msg_qnum > 0)
+ dbg("%li messages already in the ipc queue", msg_queue.msg_qnum);
+
+ retval = msgsnd(msgid, pmsg, size, 0);
+ free_hotplugmsg( (struct hotplug_msg*) pmsg);
+ if (retval == -1)
+ {
+ dbg("send ipc message error");
+ goto exit;
+ }
+ return 0;
+
+exit:
+ if (retval > 0)
+ retval = 0;
+
+ return retval;
+}
projects / systemd / commitdiff