/*
* 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.
*
*/
-#include <sys/types.h>
-#include <sys/socket.h>
-#include <sys/wait.h>
-#include <sys/un.h>
-#include <time.h>
-#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
-#include <string.h>
#include <unistd.h>
+#include <string.h>
+#include <time.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/wait.h>
+#include <sys/un.h>
#include <linux/stddef.h>
#include "udev.h"
-#include "udev_version.h"
#include "udevd.h"
-#include "logging.h"
/* global variables */
static int sock = -1;
}
#endif
-static int start_daemon(void)
-{
- pid_t pid;
- pid_t child_pid;
- char *const argv[] = { "udevd", NULL };
- char *const envp[] = { NULL };
-
- pid = fork();
- switch (pid) {
- case 0:
- /* helper child */
- child_pid = fork();
- switch (child_pid) {
- case 0:
- /* daemon with empty environment */
- close(sock);
- execve(UDEVD_BIN, argv, envp);
- err("exec of daemon failed");
- _exit(1);
- case -1:
- err("fork of daemon failed");
- return -1;
- default:
- exit(0);
- }
- break;
- case -1:
- err("fork of helper failed");
- return -1;
- default:
- waitpid(pid, NULL, 0);
- }
- return 0;
-}
-
-static void run_udev(const char *subsystem)
-{
- char *const argv[] = { "udev", (char *)subsystem, NULL };
- pid_t pid;
-
- pid = fork();
- switch (pid) {
- case 0:
- /* child */
- execv(UDEV_BIN, argv);
- err("exec of udev child failed");
- _exit(1);
- break;
- case -1:
- err("fork of udev child failed");
- break;
- default:
- waitpid(pid, NULL, 0);
- }
-}
-
int main(int argc, char *argv[], char *envp[])
{
static struct udevd_msg usend_msg;
int usend_msg_len;
int i;
- int loop;
struct sockaddr_un saddr;
socklen_t addrlen;
int bufpos = 0;
- int retval = 1;
- int started_daemon = 0;
+ int retval = 0;
const char *subsystem = NULL;
logging_init("udevsend");
#ifdef USE_LOG
- udev_init_config();
+ udev_config_init();
#endif
dbg("version %s", UDEV_VERSION);
sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
- if (sock == -1) {
- err("error getting socket");
- goto fallback;
+ if (sock < 0) {
+ err("error getting socket: %s", strerror(errno));
+ retval = 1;
+ goto exit;
}
memset(&saddr, 0x00, sizeof(struct sockaddr_un));
key = envp[i];
keylen = strlen(key);
+ /* ignore events which are already sent on the netlink socket */
+ if (strncmp(key, "SEQNUM=", 7) == 0) {
+ dbg("ignoring event with SEQNUM set");
+ retval = 0;
+ goto exit;
+ }
+
/* prevent loops in the scripts we execute */
if (strncmp(key, "UDEVD_EVENT=", 12) == 0) {
- dbg("seems that the event source is not the kernel, just exit");
+ err("event loop, already passed through the daemon, exit");
+ retval = 2;
goto exit;
}
strcpy(&usend_msg.envbuf[bufpos], key);
bufpos += keylen + 1;
}
- /* older kernels passed the SUBSYSTEM only as the first argument */
- if (!subsystem && argc == 2) {
- bufpos += sprintf(&usend_msg.envbuf[bufpos], "SUBSYSTEM=%s", argv[1]) + 1;
- dbg("add 'SUBSYSTEM=%s' to env[%i] buffer from argv", argv[1], i);
- }
usend_msg_len = offsetof(struct udevd_msg, envbuf) + bufpos;
dbg("usend_msg_len=%i", usend_msg_len);
- /* If we can't send, try to start daemon and resend message */
- loop = UDEVSEND_WAIT_MAX_SECONDS * UDEVSEND_WAIT_LOOP_PER_SECOND;
- while (--loop) {
- retval = sendto(sock, &usend_msg, usend_msg_len, 0, (struct sockaddr *)&saddr, addrlen);
- if (retval != -1) {
- retval = 0;
- goto exit;
- }
-
- if (errno != ECONNREFUSED) {
- err("error sending message (%s)", strerror(errno));
- goto fallback;
- }
-
- if (!started_daemon) {
- info("try to start udevd daemon");
- retval = start_daemon();
- if (retval) {
- dbg("error starting daemon");
- goto fallback;
- }
- dbg("udevd daemon started");
- started_daemon = 1;
- } else {
- dbg("retry to connect %d", UDEVSEND_WAIT_MAX_SECONDS * UDEVSEND_WAIT_LOOP_PER_SECOND - loop);
- usleep(1000 * 1000 / UDEVSEND_WAIT_LOOP_PER_SECOND);
- }
+ if (sendto(sock, &usend_msg, usend_msg_len, 0, (struct sockaddr *)&saddr, addrlen) < 0) {
+ retval = 3;
+ err("error sending message: %s", strerror(errno));
}
-fallback:
- err("unable to connect to event daemon, try to call udev directly");
- run_udev(subsystem);
-
exit:
if (sock != -1)
close(sock);
logging_close();
-
return retval;
}
~ianmdlvl / elogind.git / blobdiff