--- /dev/null
+/*
+ * udevstart.c
+ *
+ * Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
+ *
+ * Quick and dirty way to populate a /dev with udev if your system
+ * does not have access to a shell. Based originally on a patch to udev
+ * from Harald Hoyer <harald@redhat.com>
+ *
+ * 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 <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <errno.h>
+#include <ctype.h>
+#include <signal.h>
+#include <dirent.h>
+#include <sys/wait.h>
+
+#include "logging.h"
+
+
+#ifdef LOG
+unsigned char logname[42];
+void log_message(int level, const char *format, ...)
+{
+ va_list args;
+
+ va_start(args, format);
+ vsyslog(level, format, args);
+ va_end(args);
+}
+#endif
+
+
+#define MAX_PATHLEN 1024
+#define SYSBLOCK "/sys/block"
+#define SYSCLASS "/sys/class"
+
+static int execute_udev(char *path, char *value, int len)
+{
+ int retval;
+ int res;
+ int status;
+ int fds[2];
+ pid_t pid;
+ int value_set = 0;
+ char buffer[255];
+ char *pos;
+
+ retval = pipe(fds);
+ if (retval != 0) {
+ dbg("pipe failed");
+ return -1;
+ }
+ pid = fork();
+ switch(pid) {
+ case 0:
+ /* child */
+ close(STDOUT_FILENO);
+
+ /* dup write side of pipe to STDOUT */
+ dup(fds[1]);
+
+ dbg("executing /sbin/udev '%s'", path);
+ retval = execl("/sbin/udev", "/sbin/udev", path, NULL);
+
+ info("execution of '%s' failed", path);
+ exit(1);
+ case -1:
+ dbg("fork failed");
+ return -1;
+ default:
+ /* parent reads from fds[0] */
+ close(fds[1]);
+ retval = 0;
+ while (1) {
+ res = read(fds[0], buffer, sizeof(buffer) - 1);
+ if (res <= 0)
+ break;
+ buffer[res] = '\0';
+ if (res > len) {
+ dbg("result len %d too short", len);
+ retval = -1;
+ }
+ if (value_set) {
+ dbg("result value already set");
+ retval = -1;
+ } else {
+ value_set = 1;
+ strncpy(value, buffer, len);
+ pos = value + strlen(value)-1;
+ if (pos[0] == '\n')
+ pos[0] = '\0';
+ dbg("result is '%s'", value);
+ }
+ }
+ close(fds[0]);
+ res = wait(&status);
+ if (res < 0) {
+ dbg("wait failed result %d", res);
+ retval = -1;
+ }
+
+ if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
+ dbg("exec program status 0x%x", status);
+ retval = -1;
+ }
+ }
+ return retval;
+}
+
+static int udev_scan(void)
+{
+ char *devpath;
+ DIR *dir;
+ struct dirent *dent;
+ int retval = -EINVAL;
+ char scratch[200];
+
+ devpath = "block";
+ dir = opendir(SYSBLOCK);
+ if (dir) {
+ for (dent = readdir(dir); dent; dent = readdir(dir)) {
+ char dirname[MAX_PATHLEN];
+ DIR *dir2;
+ struct dirent *dent2;
+ if ((strcmp(dent->d_name, ".") == 0)
+ || (strcmp(dent->d_name, "..") == 0))
+ continue;
+
+ snprintf(dirname, MAX_PATHLEN, "/block/%s", dent->d_name);
+
+ setenv("DEVPATH", dirname, 1);
+ dbg("udev block, 'DEVPATH' = '%s'", dirname);
+ execute_udev("block", scratch, sizeof(scratch));
+
+ snprintf(dirname, MAX_PATHLEN, "%s/%s", SYSBLOCK, dent->d_name);
+
+ dir2 = opendir(dirname);
+ if (dir2) {
+ for (dent2 = readdir(dir2); dent2; dent2 = readdir(dir2)) {
+ char dirname2[MAX_PATHLEN];
+ DIR *dir3;
+ struct dirent *dent3;
+
+ if ((strcmp(dent2->d_name, ".") == 0) ||
+ (strcmp(dent2->d_name, "..") == 0))
+ continue;
+
+ snprintf(dirname2, MAX_PATHLEN, "%s/%s", dirname, dent2->d_name);
+
+ dir3 = opendir(dirname2);
+ if (dir3) {
+ for (dent3 = readdir(dir3); dent3; dent3 = readdir(dir3)) {
+ char filename[MAX_PATHLEN];
+
+ if (strcmp(dent3->d_name, "dev") == 0) {
+ snprintf(filename, MAX_PATHLEN, "/block/%s/%s", dent->d_name, dent2->d_name);
+ setenv("DEVPATH", filename, 1);
+ dbg("udev block, 'DEVPATH' = '%s'", filename);
+ execute_udev("block", scratch, sizeof(scratch));
+ }
+ }
+ }
+ }
+ }
+ }
+ }
+
+ devpath = "class";
+ dir = opendir(SYSCLASS);
+ if (dir) {
+ for (dent = readdir(dir); dent; dent = readdir(dir)) {
+ char dirname[MAX_PATHLEN];
+ DIR *dir2;
+ struct dirent *dent2;
+ if ((strcmp(dent->d_name, ".") == 0)
+ || (strcmp(dent->d_name, "..") == 0))
+ continue;
+
+ snprintf(dirname, MAX_PATHLEN, "%s/%s", SYSCLASS, dent->d_name);
+
+ dir2 = opendir(dirname);
+ if (dir2) {
+ for (dent2 = readdir(dir2); dent2; dent2 = readdir(dir2)) {
+ char dirname2[MAX_PATHLEN];
+ DIR *dir3;
+ struct dirent *dent3;
+
+ if ((strcmp(dent2->d_name, ".") == 0) || (strcmp(dent2->d_name, "..") == 0))
+ continue;
+
+ snprintf(dirname2, MAX_PATHLEN, "%s/%s", dirname, dent2->d_name);
+
+ dir3 = opendir(dirname2);
+ if (dir3) {
+ for (dent3 = readdir(dir3); dent3; dent3 = readdir(dir3)) {
+ char
+ filename[MAX_PATHLEN];
+
+ if (strcmp(dent3->d_name, "dev") == 0) {
+ snprintf
+ (filename,
+ MAX_PATHLEN,
+ "/class/%s/%s", dent->d_name, dent2->d_name);
+ setenv("DEVPATH", filename, 1);
+ dbg("udev '%s', 'DEVPATH' = '%s'", dent->d_name, filename);
+ execute_udev(dent->d_name, scratch, sizeof(scratch));
+ }
+ }
+ }
+ }
+ }
+ }
+ }
+
+ if (retval > 0)
+ retval = 0;
+
+ return -retval;
+}
+
+
+int main(int argc, char **argv, char **envp)
+{
+ init_logging("udevstart");
+
+ setenv("ACTION", "add", 1);
+ setenv("UDEV_NO_SLEEP", "1", 1);
+
+ return udev_scan();
+}
projects / systemd / commitdiff