matching devies.
*/
-#define FOR_mdev
#include "toys.h"
// todo, open() block devices to trigger partition scanning.
-GLOBALS(
- char *devname;
- int root_maj, root_min, verbose;
-)
-
-
// mknod in /dev based on a path like "/sys/block/hda/hda1"
-static void make_device(char *path, char *operation)
+static void make_device(char *path)
{
- char *device_name, *s, *temp, *alias = NULL, *cmd = NULL, buf[PATH_MAX];
- char sign = 0, op_pref = 0, *str2 = NULL, *ln = NULL;
- int major, minor, type, len, fd, ufd, mode = 0660;
+ char *device_name, *s, *temp;
+ int major, minor, type, len, fd;
+ int mode = 0660;
uid_t uid = 0;
gid_t gid = 0;
temp = strrchr(path, '/');
fd = open(path, O_RDONLY);
- *temp = 0;
+ *temp=0;
temp = toybuf;
len = read(fd, temp, 64);
close(fd);
- if (!strcmp(operation, "add") && len < 1) return;
+ if (len<1) return;
temp[len] = 0;
+
+ // Determine device name, type, major and minor
+
+ device_name = strrchr(path, '/') + 1;
+ type = path[5]=='c' ? S_IFCHR : S_IFBLK;
major = minor = 0;
- if (sscanf(temp, "%u:%u", &major, &minor) != 2) major = -1;
-
- memset(buf, 0, sizeof(buf));
- device_name = TT.devname;
- if (!device_name) {
- sprintf(buf,"%s/uevent", path);
- if ((ufd = open(buf, O_RDONLY)) >= 0) {
- for (; (ln = get_line(ufd)); free(ln)) {
- if (strstr(ln, "DEVNAME=")) {
- device_name = ln + strlen("DEVNAME=") ;
- break;
- }
- }
- close(ufd);
- }
- }
- if (!device_name) device_name = strrchr(path, '/') + 1;
- type = S_IFCHR;
- if (strstr(path, "/block/")) type = S_IFBLK;
+ sscanf(temp, "%u:%u", &major, &minor);
// If we have a config file, look up permissions for this device
char *conf, *pos, *end;
// mmap the config file
- if (-1 != (fd = open("/etc/mdev.conf", O_RDONLY))) {
+ if (-1!=(fd = open("/etc/mdev.conf", O_RDONLY))) {
len = fdlength(fd);
conf = mmap(NULL, len, PROT_READ, MAP_PRIVATE, fd, 0);
if (conf) {
int line = 0;
// Loop through lines in mmaped file
- for (pos = conf; pos-conf < len;) {
+ for (pos = conf; pos-conf<len;) {
int field;
char *end2;
line++;
// find end of this line
- for(end = pos; end-conf < len && *end != '\n'; end++);
+ for(end = pos; end-conf<len && *end!='\n'; end++);
- // Fields: regex uid:gid mode [alias] [cmd]
- for (field = 3; field >= 0; field--) {
+ // Three fields: regex, uid:gid, mode
+ for (field = 3; field; field--) {
// Skip whitespace
- while (pos < end && isspace(*pos)) pos++;
- if (pos == end || *pos == '#') break;
+ while (pos<end && isspace(*pos)) pos++;
+ if (pos==end || *pos=='#') break;
for (end2 = pos;
- end2 < end && !isspace(*end2) && *end2 != '#'; end2++);
+ end2<end && !isspace(*end2) && *end2!='#'; end2++);
switch(field) {
// Regex to match this device
case 3:
- {
- char *str = strndup(pos, end2-pos), *regex;
- regex_t match;
- regmatch_t off;
- int result;
-
- if (*str == '$') {
- char *p = strchr(str, '=');
-
- if (!p) {
- free(str);
- error_msg("bad $envvar=regex");
- goto end_line;
- } else {
- p++;
- regex = xstrdup(p);
- free(str);
- }
- } else {
- regex = xstrdup(str);
- free(str);
- }
- // Is this it?
- if (*regex == '@') {
- int maj, min1, min2;
-
- int ret = sscanf(regex, "@%u,%u-%u", &maj, &min1, &min2);
- free(regex);
- if (ret < 2 || maj < 0) {
- error_msg("bad @maj,min @line %d",line);
- goto end_line;
- }
- if (ret == 2) min2 = min1;
- if (!(major == maj && ( min1 <= minor || minor <= min2)))
- goto end_line;
- } else {
- xregcomp(&match, regex, REG_EXTENDED);
- result = regexec(&match, device_name, 1, &off, 0);
- regfree(&match);
- free(regex);
-
- // If not this device, skip rest of line
- if (result || off.rm_so
- || off.rm_eo != strlen(device_name))
- goto end_line;
- }
- break;
- }
- // uid:gid
+ {
+ char *regex = strndup(pos, end2-pos);
+ regex_t match;
+ regmatch_t off;
+ int result;
+
+ // Is this it?
+ xregcomp(&match, regex, REG_EXTENDED);
+ result=regexec(&match, device_name, 1, &off, 0);
+ regfree(&match);
+ free(regex);
+
+ // If not this device, skip rest of line
+ if (result || off.rm_so
+ || off.rm_eo!=strlen(device_name))
+ goto end_line;
+
+ break;
+ }
+ // uid:gid
case 2:
- {
- char *s2;
-
- // Find :
- for(s = pos; s < end2 && *s != ':'; s++);
- if (s == end2) goto end_line;
-
- // Parse UID
- uid = strtoul(pos,&s2,10);
- if (s != s2) {
- struct passwd *pass;
- char *str = xstrndup(pos, s-pos);
-
- pass = getpwnam(str);
- free(str);
- if (!pass) goto end_line;
- uid = pass->pw_uid;
- }
- s++;
- // parse GID
- gid = strtoul(s,&s2,10);
- if (end2 != s2) {
- struct group *grp;
- char *str = xstrndup(s, end2-s);
-
- grp = getgrnam(str);
- free(str);
- if (!grp) goto end_line;
- gid = grp->gr_gid;
- }
- break;
- }
- // mode
- case 1:
- {
- mode = strtoul(pos, &pos, 8);
- if (pos != end2) goto end_line;
- //goto found_device;
- break;
+ {
+ char *s2;
+
+ // Find :
+ for(s = pos; s<end2 && *s!=':'; s++);
+ if (s==end2) goto end_line;
+
+ // Parse UID
+ uid = strtoul(pos,&s2,10);
+ if (s!=s2) {
+ struct passwd *pass;
+ char *str = strndup(pos, s-pos);
+ pass = getpwnam(str);
+ free(str);
+ if (!pass) goto end_line;
+ uid = pass->pw_uid;
}
- // handle 4th and 5th field
- case 0:
- {
- char *str1 = NULL;
-
- str2 = xstrndup(pos, end-pos);
- if (strchr(">=!", str2[0])) {
- str1 = strtok(str2, " ");
- sign = str1[0];
- alias = str1 + 1;
- str1 += strlen(alias) +2;
- } else str1 = str2;
- if (str1 && strchr("$@*",str1[0])) {
- op_pref = str1[0];
- cmd = str1 + 1;
- } else error_exit("Bad Line %d", line);
- goto found_device;
+ s++;
+ // parse GID
+ gid = strtoul(s,&s2,10);
+ if (end2!=s2) {
+ struct group *grp;
+ char *str = strndup(s, end2-s);
+ grp = getgrnam(str);
+ free(str);
+ if (!grp) goto end_line;
+ gid = grp->gr_gid;
}
+ break;
+ }
+ // mode
+ case 1:
+ {
+ mode = strtoul(pos, &pos, 8);
+ if (pos!=end2) goto end_line;
+ goto found_device;
+ }
}
- pos = end2;
+ pos=end2;
}
end_line:
// Did everything parse happily?
- if (field && field != 3) error_exit("bad line %d", line);
+ if (field && field!=3) error_exit("Bad line %d", line);
+
// Next line
pos = ++end;
}
}
}
- if (operation && !((op_pref == '@' && !strcmp(operation, "add")) ||
- (op_pref == '$' && !strcmp(operation, "remove")) || (op_pref == '*')))
- cmd = NULL;
-
- if (alias) {
- if (alias[strlen(alias)-1] == '/') sprintf(temp,"%s%s",alias, device_name);
- else sprintf(temp,"%s",alias);
- }
- if (sign != '!' && operation && !strcmp(operation, "add")) { //not to create device otherwise
-
- if (mknod(device_name, mode | type, makedev(major, minor)) && errno != EEXIST)
- perror_msg("mknod /dev/%s failed", device_name);
- if (CFG_MDEV_CONF) {
- chmod(device_name, mode);
- chown(device_name, uid, gid);
- }
-
- if (TT.root_maj == major && TT.root_min == minor) symlink(device_name, "root");
-
- if (alias && (sign == '>' || sign == '=')) {
- mkpathat(AT_FDCWD, alias, 0, 2);
- if (rename(device_name, temp)) perror_exit("rename temp");
- if (sign == '>') symlink(temp, device_name);
- }
- }
- if (cmd) {
- char *str = xmprintf("%s=%s", "MDEV", device_name);
-
- putenv(str);
- if (system(cmd) == -1) perror_msg("can't run '%s'", cmd);
- unsetenv(str);
- free(str);
- }
+ sprintf(temp, "/dev/%s", device_name);
+ if (mknod(temp, mode | type, makedev(major, minor)) && errno != EEXIST)
+ perror_exit("mknod %s failed", temp);
- if (operation && !strcmp(operation, "remove") && major >= -1) {
- if (alias && sign == '>') unlink(temp);
- unlink(device_name);
- }
- free(str2);
- free(ln);
+ if (CFG_MDEV_CONF) mode=chown(temp, uid, gid);
}
static int callback(struct dirtree *node)
// Entries in /sys/class/block aren't char devices, so skip 'em. (We'll
// get block devices out of /sys/block.)
if(!strcmp(node->name, "block")) return 0;
- if (!dirtree_notdotdot(node)) return 0;
// Does this directory have a "dev" entry in it?
// This is path based because the hotplug callbacks are
if (S_ISDIR(node->st.st_mode) || S_ISLNK(node->st.st_mode)) {
- int len = 4;
+ int len=4;
char *dev = dirtree_path(node, &len);
strcpy(dev+len, "/dev");
- if (!access(dev, R_OK)) make_device(dev, "add");
+ if (!access(dev, R_OK)) make_device(dev);
free(dev);
}
// Circa 2.6.25 the entries more than 2 deep are all either redundant
// (mouse#, event#) or unnamed (every usb_* entry is called "device").
- return (node->parent && node->parent->parent) ? 0 :
- DIRTREE_RECURSE|DIRTREE_SYMFOLLOW;
-}
-
-#if 0
-static int sequence_file(char *seq)
-{
- static struct timespec tspec = { 0, 32*1000*1000 }; // time out after 2 secs
- int time_out = 2000 / 32, fd = -1;
- sigset_t sg;
-
- sigemptyset(&sg);
- sigaddset(&sg, SIGCHLD);
- sigprocmask(SIG_BLOCK, &sg, NULL);
-
- for (;;) {
- ssize_t slen;
- char buf[sizeof(int)*3 + 2];
-
- if (fd < 0 && (fd = open("/dev/mdev.seq", O_RDWR)) < 0) break;
- if ((slen = pread(fd, buf, sizeof(buf) - 1, 0)) < 0) {
- close(fd);
- fd = -1;
- break;
- }
- buf[slen] = '\0';
- if (buf[0] == '\n') {
- xwrite(fd, seq, strlen(seq));
- xlseek(fd, 0, SEEK_SET);
- break;
- }
- if (!strcmp(seq, buf)) break;
- if (sigtimedwait(&sg, NULL, &tspec) >= 0) continue;
- if (!--time_out) break;
- }
- sigprocmask(SIG_UNBLOCK, &sg, NULL);
- return fd;
-}
-#endif
-
-static void firmware_load(char *fware, char *sysfs_path)
-{
- int count, fd, lfd, dfd;
-
- xchdir("/lib/firmware");
- fd = open(fware, O_RDONLY);
- // check for /sys/$DEVPATH/loading ... give 30 seconds to appear
- xchdir(sysfs_path);
- for (count = 0; count < 30; ++count) {
- lfd = open("loading", O_WRONLY);
- if (lfd >= 0) goto load;
- sleep(1);
- }
- goto end;
-
-load:
- if (fd >= 0) {
- if (writeall(lfd, "1", 1) != 1) goto end;
- dfd = open("data", O_WRONLY);
- if (dfd < 0) goto end;
- xsendfile(fd, dfd);
- close(dfd);
- }
- if (fd >= 0) writeall(lfd, "0", 1);
- else writeall(lfd, "-1", 2);
-
-end:
- xchdir("/dev");
- close(lfd);
- close(fd);
+ return (node->parent && node->parent->parent) ? 0 : DIRTREE_RECURSE;
}
void mdev_main(void)
{
+ // Handle -s
- char buf[PATH_MAX];
- struct dirtree *root;
-
- umask(0);
- xchdir("/dev");
- if (toys.optflags & FLAG_s) {
- struct stat st;
-
- xstat("/", &st);
- TT.root_maj = major(st.st_dev);
- TT.root_min = minor(st.st_dev);
- putenv((char*)"ACTION=add");
-
- root = dirtree_add_node(0, "/sys/class", 1);
- if (root) dirtree_handle_callback(root, callback);
-
- root = dirtree_add_node(0, "/sys/block", 1);
- if (root) dirtree_handle_callback(root, callback);
- } else { // Hotplug handling
- char *fware, *action, *devpath;
- int logfd;
-
- action = getenv("ACTION");
- TT.devname = getenv("DEVNAME");
- devpath = getenv("DEVPATH");
-
- if (!action || !devpath) {
- toys.exithelp++;
- error_exit("env var action/devpath not found");
- }
- fware = getenv("FIRMWARE");
-
- if ((logfd = open("/dev/mdev.log", O_WRONLY | O_APPEND)) >= 0) {
- dup2(logfd, 2); // 2 -> STDERR_FILENO
- TT.verbose = 1;
- }
- //TODO give sequencei file support.
-
- // seqfd = seq_num ? sequence_file(seq_num) : -1;
- snprintf(buf, PATH_MAX, "/sys%s/dev", devpath);
- if (action && !strcmp("remove", action) && !fware)
- make_device(buf, action);
- else {
- make_device(buf, action);
- buf[strlen(buf) - 4] = '\0'; //remove /dev from end.
- if (action && !strcmp("add", action) && fware)
- firmware_load(fware, buf);
- }
+ if (toys.optflags) {
+ dirtree_read("/sys/class", callback);
+ dirtree_read("/sys/block", callback);
}
+
+ // hotplug support goes here
}
projects / platform / upstream / toybox.git / commitdiff