#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 <time.h>
#include <linux/stddef.h>
#include "udev.h"
+#include "udev_lib.h"
#include "udev_version.h"
#include "udevd.h"
#include "logging.h"
+/* global variables */
+static int sock = -1;
+
#ifdef LOG
unsigned char logname[LOGNAME_SIZE];
void log_message (int level, const char *format, ...)
}
#endif
-static int build_hotplugmsg(struct hotplug_msg *msg, char *action,
- char *devpath, char *subsystem, int seqnum)
-{
- memset(msg, 0x00, sizeof(*msg));
- strfieldcpy(msg->magic, UDEV_MAGIC);
- msg->seqnum = seqnum;
- strfieldcpy(msg->action, action);
- strfieldcpy(msg->devpath, devpath);
- strfieldcpy(msg->subsystem, subsystem);
- return sizeof(struct hotplug_msg);
-}
-
static int start_daemon(void)
{
pid_t pid;
switch (child_pid) {
case 0:
/* daemon */
- setsid();
- chdir("/");
+ close(sock);
execl(UDEVD_BIN, "udevd", NULL);
dbg("exec of daemon failed");
- exit(1);
+ _exit(1);
case -1:
dbg("fork of daemon failed");
return -1;
dbg("fork of helper failed");
return -1;
default:
- wait(NULL);
+ waitpid(pid, NULL, 0);
}
return 0;
}
-int main(int argc, char* argv[])
+static void run_udev(const char *subsystem)
{
- struct hotplug_msg msg;
- char *action;
- char *devpath;
- char *subsystem;
- char *seqnum;
- int seq;
- int retval = 1;
- int size;
+ pid_t pid;
+
+ pid = fork();
+ switch (pid) {
+ case 0:
+ /* child */
+ execl(UDEV_BIN, "udev", subsystem, NULL);
+ dbg("exec of child failed");
+ _exit(1);
+ break;
+ case -1:
+ dbg("fork of child failed");
+ break;
+ default:
+ waitpid(pid, NULL, 0);
+ }
+}
+
+int main(int argc, char *argv[], char *envp[])
+{
+ static struct udevsend_msg usend_msg;
+ int usend_msg_len;
+ int i;
int loop;
- struct timespec tspec;
- int sock;
struct sockaddr_un saddr;
socklen_t addrlen;
+ const char *subsystem_argv;
+ int subsystem_env = 0;
+ int bufpos = 0;
+ int retval = 1;
int started_daemon = 0;
-#ifdef DEBUG
- init_logging("udevsend");
-#endif
+ logging_init("udevsend");
dbg("version %s", UDEV_VERSION);
- subsystem = get_subsystem(argv[1]);
- if (subsystem == NULL) {
+ subsystem_argv = argv[1];
+ if (subsystem_argv == NULL) {
dbg("no subsystem");
goto exit;
}
- dbg("subsystem = '%s'", subsystem);
-
- devpath = get_devpath();
- if (devpath == NULL) {
- dbg("no devpath");
- goto exit;
- }
- dbg("DEVPATH = '%s'", devpath);
- action = get_action();
- if (action == NULL) {
- dbg("no action");
+ /* prevent loops in the scripts we execute */
+ if (getenv("MANAGED_EVENT") != NULL) {
+ dbg("seems that the event source is not the kernel, just exit");
goto exit;
}
- dbg("ACTION = '%s'", action);
-
- seqnum = get_seqnum();
- if (seqnum == NULL)
- seq = -1;
- else
- seq = atoi(seqnum);
- dbg("SEQNUM = '%d'", seq);
sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
if (sock == -1) {
dbg("error getting socket");
- goto exit;
+ goto fallback;
}
- memset(&saddr, 0x00, sizeof(saddr));
+ memset(&saddr, 0x00, sizeof(struct sockaddr_un));
saddr.sun_family = AF_LOCAL;
/* use abstract namespace for socket path */
strcpy(&saddr.sun_path[1], UDEVD_SOCK_PATH);
addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(saddr.sun_path+1) + 1;
- size = build_hotplugmsg(&msg, action, devpath, subsystem, seq);
+ memset(&usend_msg, 0x00, sizeof(struct udevsend_msg));
+
+ strcpy(usend_msg.magic, UDEV_MAGIC);
+
+ /* copy all keys to send buffer */
+ for (i = 0; envp[i]; i++) {
+ const char *key;
+ int keylen;
+
+ key = envp[i];
+ keylen = strlen(key);
+ if (bufpos + keylen >= HOTPLUG_BUFFER_SIZE-1) {
+ dbg("environment buffer too small, probably not called by the kernel");
+ continue;
+ }
+
+ /* older kernels do not have the SUBSYSTEM in the environment */
+ if (strncmp(key, "SUBSYSTEM=", 10) == 0)
+ subsystem_env = 1;
+
+ dbg("add '%s' to env[%i] buffer", key, i);
+ strcpy(&usend_msg.envbuf[bufpos], key);
+ bufpos += keylen + 1;
+ }
+ if (!subsystem_env) {
+ bufpos += sprintf(&usend_msg.envbuf[bufpos], "SUBSYSTEM=%s", subsystem_argv) + 1;
+ dbg("add 'SUBSYSTEM=%s' to env[%i] buffer from argv", subsystem_argv, i);
+ }
+
+ usend_msg_len = offsetof(struct udevsend_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_CONNECT_RETRY;
- while (loop--) {
- retval = sendto(sock, &msg, size, 0, (struct sockaddr *)&saddr, addrlen);
+ loop = SEND_WAIT_MAX_SECONDS * SEND_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 close_and_exit;
+ goto exit;
}
-
+
if (errno != ECONNREFUSED) {
- dbg("error sending message");
- goto close_and_exit;
+ dbg("error sending message (%s)", strerror(errno));
+ goto fallback;
}
-
+
if (!started_daemon) {
- dbg("connect failed, try starting daemon...");
+ dbg("try to start udevd daemon");
retval = start_daemon();
if (retval) {
- dbg("error starting daemon");
- goto exit;
+ info("error starting daemon");
+ goto fallback;
}
-
- dbg("daemon started");
+ info("udevd daemon started");
started_daemon = 1;
} else {
- dbg("retry to connect %d", UDEVSEND_CONNECT_RETRY - loop);
- tspec.tv_sec = 0;
- tspec.tv_nsec = 100000000; /* 100 millisec */
- nanosleep(&tspec, NULL);
+ dbg("retry to connect %d", SEND_WAIT_MAX_SECONDS * SEND_WAIT_LOOP_PER_SECOND - loop);
+ usleep(1000 * 1000 / SEND_WAIT_LOOP_PER_SECOND);
}
}
-
-close_and_exit:
- close(sock);
+
+fallback:
+ info("unable to connect to event daemon, try to call udev directly");
+ run_udev(subsystem_argv);
+
exit:
+ if (sock != -1)
+ close(sock);
+
+ logging_close();
+
return retval;
}
~ianmdlvl / elogind.git / blobdiff