+
+ /* allow programs in /lib/udev called without the path */
+ if (strchr(argv[0], '/') == NULL) {
+ strlcpy(program, "/lib/udev/", sizeof(program));
+ strlcat(program, argv[0], sizeof(program));
+ argv[0] = program;
+ }
+
+ pid = fork();
+ switch(pid) {
+ case 0:
+ /* child closes parent ends of pipes */
+ if (outpipe[READ_END] > 0)
+ close(outpipe[READ_END]);
+ if (errpipe[READ_END] > 0)
+ close(errpipe[READ_END]);
+
+ /* discard child output or connect to pipe */
+ devnull = open("/dev/null", O_RDWR);
+ if (devnull > 0) {
+ dup2(devnull, STDIN_FILENO);
+ if (outpipe[WRITE_END] < 0)
+ dup2(devnull, STDOUT_FILENO);
+ if (errpipe[WRITE_END] < 0)
+ dup2(devnull, STDERR_FILENO);
+ close(devnull);
+ } else
+ err("open /dev/null failed: %s", strerror(errno));
+ if (outpipe[WRITE_END] > 0) {
+ dup2(outpipe[WRITE_END], STDOUT_FILENO);
+ close(outpipe[WRITE_END]);
+ }
+ if (errpipe[WRITE_END] > 0) {
+ dup2(errpipe[WRITE_END], STDERR_FILENO);
+ close(errpipe[WRITE_END]);
+ }
+ execv(argv[0], argv);
+ if (errno == ENOENT || errno == ENOTDIR) {
+ /* may be on a filesytem which is not mounted right now */
+ info("program '%s' not found", argv[0]);
+ } else {
+ /* other problems */
+ err("exec of program '%s' failed", argv[0]);
+ }
+ _exit(1);
+ case -1:
+ err("fork of '%s' failed: %s", argv[0], strerror(errno));
+ return -1;
+ default:
+ /* read from child if requested */
+ if (outpipe[READ_END] > 0 || errpipe[READ_END] > 0) {
+ ssize_t count;
+ size_t respos = 0;
+
+ /* parent closes child ends of pipes */
+ if (outpipe[WRITE_END] > 0)
+ close(outpipe[WRITE_END]);
+ if (errpipe[WRITE_END] > 0)
+ close(errpipe[WRITE_END]);
+
+ /* read child output */
+ while (outpipe[READ_END] > 0 || errpipe[READ_END] > 0) {
+ int fdcount;
+ fd_set readfds;
+
+ FD_ZERO(&readfds);
+ if (outpipe[READ_END] > 0)
+ FD_SET(outpipe[READ_END], &readfds);
+ if (errpipe[READ_END] > 0)
+ FD_SET(errpipe[READ_END], &readfds);
+ fdcount = select(UDEV_MAX(outpipe[READ_END], errpipe[READ_END])+1, &readfds, NULL, NULL, NULL);
+ if (fdcount < 0) {
+ if (errno == EINTR)
+ continue;
+ retval = -1;
+ break;
+ }
+
+ /* get stdout */
+ if (outpipe[READ_END] > 0 && FD_ISSET(outpipe[READ_END], &readfds)) {
+ char inbuf[1024];
+ char *pos;
+ char *line;
+
+ count = read(outpipe[READ_END], inbuf, sizeof(inbuf)-1);
+ if (count <= 0) {
+ close(outpipe[READ_END]);
+ outpipe[READ_END] = -1;
+ if (count < 0) {
+ err("stdin read failed: %s", strerror(errno));
+ retval = -1;
+ }
+ continue;
+ }
+ inbuf[count] = '\0';
+
+ /* store result for rule processing */
+ if (result) {
+ if (respos + count < ressize) {
+ memcpy(&result[respos], inbuf, count);
+ respos += count;
+ } else {
+ err("ressize %ld too short", (long)ressize);
+ retval = -1;
+ }
+ }
+ pos = inbuf;
+ while ((line = strsep(&pos, "\n")))
+ if (pos || line[0] != '\0')
+ info("'%s' (stdout) '%s'", argv[0], line);
+ }
+
+ /* get stderr */
+ if (errpipe[READ_END] > 0 && FD_ISSET(errpipe[READ_END], &readfds)) {
+ char errbuf[1024];
+ char *pos;
+ char *line;
+
+ count = read(errpipe[READ_END], errbuf, sizeof(errbuf)-1);
+ if (count <= 0) {
+ close(errpipe[READ_END]);
+ errpipe[READ_END] = -1;
+ if (count < 0)
+ err("stderr read failed: %s", strerror(errno));
+ continue;
+ }
+ errbuf[count] = '\0';
+ pos = errbuf;
+ while ((line = strsep(&pos, "\n")))
+ if (pos || line[0] != '\0')
+ info("'%s' (stderr) '%s'", argv[0], line);
+ }
+ }
+ if (outpipe[READ_END] > 0)
+ close(outpipe[READ_END]);
+ if (errpipe[READ_END] > 0)
+ close(errpipe[READ_END]);
+
+ /* return the childs stdout string */
+ if (result) {
+ result[respos] = '\0';
+ dbg("result='%s'", result);
+ if (reslen)
+ *reslen = respos;
+ }
+ }
+ waitpid(pid, &status, 0);
+ if (WIFEXITED(status)) {
+ info("'%s' returned with status %i", argv[0], WEXITSTATUS(status));
+ if (WEXITSTATUS(status) != 0)
+ retval = -1;
+ } else {
+ err("'%s' abnormal exit", argv[0]);
+ retval = -1;
+ }
+ }
+
+ return retval;
+}
+
+static int import_keys_into_env(struct udevice *udev, const char *buf, size_t bufsize)
+{
+ char line[LINE_SIZE];
+ const char *bufline;
+ char *linepos;
+ char *variable;
+ char *value;
+ size_t cur;
+ size_t count;
+ int lineno;
+
+ /* loop through the whole buffer */
+ lineno = 0;
+ cur = 0;
+ while (cur < bufsize) {
+ count = buf_get_line(buf, bufsize, cur);
+ bufline = &buf[cur];
+ cur += count+1;
+ lineno++;
+
+ if (count >= sizeof(line)) {
+ err("line too long, conf line skipped %s, line %d", udev_config_filename, lineno);
+ continue;
+ }
+
+ /* eat the whitespace */
+ while ((count > 0) && isspace(bufline[0])) {
+ bufline++;
+ count--;
+ }
+ if (count == 0)
+ continue;
+
+ /* see if this is a comment */
+ if (bufline[0] == COMMENT_CHARACTER)
+ continue;
+
+ memcpy(line, bufline, count);
+ line[count] = '\0';
+
+ linepos = line;
+ if (get_key(&linepos, &variable, &value) == 0) {
+ dbg("import '%s=%s'", variable, value);
+
+ /* handle device, renamed by external tool, returning new path */
+ if (strcmp(variable, "DEVPATH") == 0) {
+ info("updating devpath from '%s' to '%s'", udev->dev->devpath, value);
+ sysfs_device_set_values(udev->dev, value, NULL, NULL);
+ } else
+ name_list_key_add(&udev->env_list, variable, value);
+ setenv(variable, value, 1);
+ }
+ }
+
+ return 0;
+}
+
+static int import_file_into_env(struct udevice *udev, const char *filename)
+{
+ char *buf;
+ size_t bufsize;
+
+ if (file_map(filename, &buf, &bufsize) != 0) {
+ err("can't open '%s': %s", filename, strerror(errno));
+ return -1;
+ }
+ import_keys_into_env(udev, buf, bufsize);
+ file_unmap(buf, bufsize);
+
+ return 0;
+}
+
+static int import_program_into_env(struct udevice *udev, const char *program)
+{
+ char result[2048];
+ size_t reslen;
+
+ if (run_program(program, udev->dev->subsystem, result, sizeof(result), &reslen) != 0)
+ return -1;
+ return import_keys_into_env(udev, result, reslen);