*
* Licensed under GPLv2, see file LICENSE in this source tree.
*/
-
//config:config MDEV
-//config: bool "mdev"
+//config: bool "mdev (16 kb)"
//config: default y
//config: select PLATFORM_LINUX
//config: help
-//config: mdev is a mini-udev implementation for dynamically creating device
-//config: nodes in the /dev directory.
+//config: mdev is a mini-udev implementation for dynamically creating device
+//config: nodes in the /dev directory.
//config:
-//config: For more information, please see docs/mdev.txt
+//config: For more information, please see docs/mdev.txt
//config:
//config:config FEATURE_MDEV_CONF
//config: bool "Support /etc/mdev.conf"
//config: default y
//config: depends on MDEV
//config: help
-//config: Add support for the mdev config file to control ownership and
-//config: permissions of the device nodes.
+//config: Add support for the mdev config file to control ownership and
+//config: permissions of the device nodes.
//config:
-//config: For more information, please see docs/mdev.txt
+//config: For more information, please see docs/mdev.txt
//config:
//config:config FEATURE_MDEV_RENAME
//config: bool "Support subdirs/symlinks"
//config: default y
//config: depends on FEATURE_MDEV_CONF
//config: help
-//config: Add support for renaming devices and creating symlinks.
+//config: Add support for renaming devices and creating symlinks.
//config:
-//config: For more information, please see docs/mdev.txt
+//config: For more information, please see docs/mdev.txt
//config:
//config:config FEATURE_MDEV_RENAME_REGEXP
//config: bool "Support regular expressions substitutions when renaming device"
//config: default y
//config: depends on FEATURE_MDEV_RENAME
//config: help
-//config: Add support for regular expressions substitutions when renaming
-//config: device.
+//config: Add support for regular expressions substitutions when renaming
+//config: device.
//config:
//config:config FEATURE_MDEV_EXEC
//config: bool "Support command execution at device addition/removal"
//config: default y
//config: depends on FEATURE_MDEV_CONF
//config: help
-//config: This adds support for an optional field to /etc/mdev.conf for
-//config: executing commands when devices are created/removed.
+//config: This adds support for an optional field to /etc/mdev.conf for
+//config: executing commands when devices are created/removed.
//config:
-//config: For more information, please see docs/mdev.txt
+//config: For more information, please see docs/mdev.txt
//config:
//config:config FEATURE_MDEV_LOAD_FIRMWARE
-//config: bool "Support loading of firmwares"
+//config: bool "Support loading of firmware"
//config: default y
//config: depends on MDEV
//config: help
-//config: Some devices need to load firmware before they can be usable.
+//config: Some devices need to load firmware before they can be usable.
//config:
-//config: These devices will request userspace look up the files in
-//config: /lib/firmware/ and if it exists, send it to the kernel for
-//config: loading into the hardware.
+//config: These devices will request userspace look up the files in
+//config: /lib/firmware/ and if it exists, send it to the kernel for
+//config: loading into the hardware.
//applet:IF_MDEV(APPLET(mdev, BB_DIR_SBIN, BB_SUID_DROP))
//usage: IF_FEATURE_MDEV_CONF(
//usage: "\n"
//usage: "It uses /etc/mdev.conf with lines\n"
-//usage: " [-]DEVNAME UID:GID PERM"
+//usage: " [-][ENV=regex;]...DEVNAME UID:GID PERM"
//usage: IF_FEATURE_MDEV_RENAME(" [>|=PATH]|[!]")
//usage: IF_FEATURE_MDEV_EXEC(" [@|$|*PROG]")
//usage: "\n"
//usage: "\n"
//usage: "If /dev/mdev.seq file exists, mdev will wait for its value\n"
//usage: "to match $SEQNUM variable. This prevents plug/unplug races.\n"
-//usage: "To activate this feature, create empty /dev/mdev.seq at boot."
-//usage:
-//usage:#define mdev_notes_usage ""
-//usage: IF_FEATURE_MDEV_CONFIG(
-//usage: "The mdev config file contains lines that look like:\n"
-//usage: " hd[a-z][0-9]* 0:3 660\n\n"
-//usage: "That's device name (with regex match), uid:gid, and permissions.\n\n"
-//usage: IF_FEATURE_MDEV_EXEC(
-//usage: "Optionally, that can be followed (on the same line) by a special character\n"
-//usage: "and a command line to run after creating/before deleting the corresponding\n"
-//usage: "device(s). The environment variable $MDEV indicates the active device node\n"
-//usage: "(which is useful if it's a regex match). For example:\n\n"
-//usage: " hdc root:cdrom 660 *ln -s $MDEV cdrom\n\n"
-//usage: "The special characters are @ (run after creating), $ (run before deleting),\n"
-//usage: "and * (run both after creating and before deleting). The commands run in\n"
-//usage: "the /dev directory, and use system() which calls /bin/sh.\n\n"
-//usage: )
-//usage: "Config file parsing stops on the first matching line. If no config\n"
-//usage: "entry is matched, devices are created with default 0:0 660. (Make\n"
-//usage: "the last line match .* to override this.)\n\n"
-//usage: )
+//usage: "To activate this feature, create empty /dev/mdev.seq at boot.\n"
+//usage: "\n"
+//usage: "If /dev/mdev.log file exists, debug log will be appended to it."
#include "libbb.h"
+#include "common_bufsiz.h"
#include "xregex.h"
/* "mdev -s" scans /sys/class/xxx, looking for directories which have dev
* (todo: explain "delete" and $FIRMWARE)
*
* If /etc/mdev.conf exists, it may modify /dev/device_name's properties.
- * /etc/mdev.conf file format:
- *
- * [-][subsystem/]device user:grp mode [>|=path]|[!] [@|$|*command args...]
- * [-]@maj,min[-min2] user:grp mode [>|=path]|[!] [@|$|*command args...]
- * [-]$envvar=val user:grp mode [>|=path]|[!] [@|$|*command args...]
*
* Leading minus in 1st field means "don't stop on this line", otherwise
* search is stopped after the matching line is encountered.
*
- * The device name or "subsystem/device" combo is matched against 1st field
- * (which is a regex), or maj,min is matched against 1st field,
- * or specified environment variable (as regex) is matched against 1st field.
- *
- * $envvar=val format is useful for loading modules for hot-plugged devices
+ * $envvar=regex format is useful for loading modules for hot-plugged devices
* which do not have driver loaded yet. In this case /sys/class/.../dev
* does not exist, but $MODALIAS is set to needed module's name
* (actually, an alias to it) by kernel. This rule instructs mdev
* This happens regardless of /sys/class/.../dev existence.
*/
+/* Kernel's hotplug environment constantly changes.
+ * Here are new cases I observed on 3.1.0:
+ *
+ * Case with $DEVNAME and $DEVICE, not just $DEVPATH:
+ * ACTION=add
+ * BUSNUM=001
+ * DEVICE=/proc/bus/usb/001/003
+ * DEVNAME=bus/usb/001/003
+ * DEVNUM=003
+ * DEVPATH=/devices/pci0000:00/0000:00:02.1/usb1/1-5
+ * DEVTYPE=usb_device
+ * MAJOR=189
+ * MINOR=2
+ * PRODUCT=18d1/4e12/227
+ * SUBSYSTEM=usb
+ * TYPE=0/0/0
+ *
+ * Case with $DEVICE, but no $DEVNAME - apparenty, usb iface notification?
+ * "Please load me a module" thing?
+ * ACTION=add
+ * DEVICE=/proc/bus/usb/001/003
+ * DEVPATH=/devices/pci0000:00/0000:00:02.1/usb1/1-5/1-5:1.0
+ * DEVTYPE=usb_interface
+ * INTERFACE=8/6/80
+ * MODALIAS=usb:v18D1p4E12d0227dc00dsc00dp00ic08isc06ip50
+ * PRODUCT=18d1/4e12/227
+ * SUBSYSTEM=usb
+ * TYPE=0/0/0
+ *
+ * ACTION=add
+ * DEVPATH=/devices/pci0000:00/0000:00:02.1/usb1/1-5/1-5:1.0/host5
+ * DEVTYPE=scsi_host
+ * SUBSYSTEM=scsi
+ *
+ * ACTION=add
+ * DEVPATH=/devices/pci0000:00/0000:00:02.1/usb1/1-5/1-5:1.0/host5/scsi_host/host5
+ * SUBSYSTEM=scsi_host
+ *
+ * ACTION=add
+ * DEVPATH=/devices/pci0000:00/0000:00:02.1/usb1/1-5/1-5:1.0/host5/target5:0:0
+ * DEVTYPE=scsi_target
+ * SUBSYSTEM=scsi
+ *
+ * Case with strange $MODALIAS:
+ * ACTION=add
+ * DEVPATH=/devices/pci0000:00/0000:00:02.1/usb1/1-5/1-5:1.0/host5/target5:0:0/5:0:0:0
+ * DEVTYPE=scsi_device
+ * MODALIAS=scsi:t-0x00
+ * SUBSYSTEM=scsi
+ *
+ * ACTION=add
+ * DEVPATH=/devices/pci0000:00/0000:00:02.1/usb1/1-5/1-5:1.0/host5/target5:0:0/5:0:0:0/scsi_disk/5:0:0:0
+ * SUBSYSTEM=scsi_disk
+ *
+ * ACTION=add
+ * DEVPATH=/devices/pci0000:00/0000:00:02.1/usb1/1-5/1-5:1.0/host5/target5:0:0/5:0:0:0/scsi_device/5:0:0:0
+ * SUBSYSTEM=scsi_device
+ *
+ * Case with explicit $MAJOR/$MINOR (no need to read /sys/$DEVPATH/dev?):
+ * ACTION=add
+ * DEVNAME=bsg/5:0:0:0
+ * DEVPATH=/devices/pci0000:00/0000:00:02.1/usb1/1-5/1-5:1.0/host5/target5:0:0/5:0:0:0/bsg/5:0:0:0
+ * MAJOR=253
+ * MINOR=1
+ * SUBSYSTEM=bsg
+ *
+ * ACTION=add
+ * DEVPATH=/devices/virtual/bdi/8:16
+ * SUBSYSTEM=bdi
+ *
+ * ACTION=add
+ * DEVNAME=sdb
+ * DEVPATH=/block/sdb
+ * DEVTYPE=disk
+ * MAJOR=8
+ * MINOR=16
+ * SUBSYSTEM=block
+ *
+ * Case with ACTION=change:
+ * ACTION=change
+ * DEVNAME=sdb
+ * DEVPATH=/block/sdb
+ * DEVTYPE=disk
+ * DISK_MEDIA_CHANGE=1
+ * MAJOR=8
+ * MINOR=16
+ * SUBSYSTEM=block
+ */
+
+#define DEBUG_LVL 2
+
+#if DEBUG_LVL >= 1
+# define dbg1(...) do { if (G.verbose) bb_error_msg(__VA_ARGS__); } while(0)
+#else
+# define dbg1(...) ((void)0)
+#endif
+#if DEBUG_LVL >= 2
+# define dbg2(...) do { if (G.verbose >= 2) bb_error_msg(__VA_ARGS__); } while(0)
+#else
+# define dbg2(...) ((void)0)
+#endif
+#if DEBUG_LVL >= 3
+# define dbg3(...) do { if (G.verbose >= 3) bb_error_msg(__VA_ARGS__); } while(0)
+#else
+# define dbg3(...) ((void)0)
+#endif
+
+
+static const char keywords[] ALIGN1 = "add\0remove\0"; // "change\0"
+enum { OP_add, OP_remove };
+
+struct envmatch {
+ struct envmatch *next;
+ char *envname;
+ regex_t match;
+};
+
struct rule {
bool keep_matching;
bool regex_compiled;
- bool regex_has_slash;
mode_t mode;
int maj, min0, min1;
struct bb_uidgid_t ugid;
char *ren_mov;
IF_FEATURE_MDEV_EXEC(char *r_cmd;)
regex_t match;
+ struct envmatch *envmatch;
};
struct globals {
int root_major, root_minor;
+ smallint verbose;
char *subsystem;
+ char *subsys_env; /* for putenv("SUBSYSTEM=subsystem") */
#if ENABLE_FEATURE_MDEV_CONF
const char *filename;
parser_t *parser;
unsigned rule_idx;
#endif
struct rule cur_rule;
+ char timestr[sizeof("HH:MM:SS.123456")];
} FIX_ALIASING;
-#define G (*(struct globals*)&bb_common_bufsiz1)
-#define INIT_G() do { } while (0)
+#define G (*(struct globals*)bb_common_bufsiz1)
+#define INIT_G() do { \
+ setup_common_bufsiz(); \
+ IF_NOT_FEATURE_MDEV_CONF(G.cur_rule.maj = -1;) \
+ IF_NOT_FEATURE_MDEV_CONF(G.cur_rule.mode = 0660;) \
+} while (0)
/* Prevent infinite loops in /sys symlinks */
#define MAX_SYSFS_DEPTH 3
-/* We use additional 64+ bytes in make_device() */
-#define SCRATCH_SIZE 80
-
-#if 0
-# define dbg(...) bb_error_msg(__VA_ARGS__)
-#else
-# define dbg(...) ((void)0)
-#endif
-
+/* We use additional bytes in make_device() */
+#define SCRATCH_SIZE 128
#if ENABLE_FEATURE_MDEV_CONF
static void clean_up_cur_rule(void)
{
+ struct envmatch *e;
+
free(G.cur_rule.envvar);
+ free(G.cur_rule.ren_mov);
if (G.cur_rule.regex_compiled)
regfree(&G.cur_rule.match);
- free(G.cur_rule.ren_mov);
IF_FEATURE_MDEV_EXEC(free(G.cur_rule.r_cmd);)
+ e = G.cur_rule.envmatch;
+ while (e) {
+ free(e->envname);
+ regfree(&e->match);
+ e = e->next;
+ }
make_default_cur_rule();
}
+static char *parse_envmatch_pfx(char *val)
+{
+ struct envmatch **nextp = &G.cur_rule.envmatch;
+
+ for (;;) {
+ struct envmatch *e;
+ char *semicolon;
+ char *eq = strchr(val, '=');
+ if (!eq /* || eq == val? */)
+ return val;
+ if (endofname(val) != eq)
+ return val;
+ semicolon = strchr(eq, ';');
+ if (!semicolon)
+ return val;
+ /* ENVVAR=regex;... */
+ *nextp = e = xzalloc(sizeof(*e));
+ nextp = &e->next;
+ e->envname = xstrndup(val, eq - val);
+ *semicolon = '\0';
+ xregcomp(&e->match, eq + 1, REG_EXTENDED);
+ *semicolon = ';';
+ val = semicolon + 1;
+ }
+}
+
static void parse_next_rule(void)
{
/* Note: on entry, G.cur_rule is set to default */
char *tokens[4];
char *val;
- if (!config_read(G.parser, tokens, 4, 3, "# \t", PARSE_NORMAL))
+ /* No PARSE_EOL_COMMENTS, because command may contain '#' chars */
+ if (!config_read(G.parser, tokens, 4, 3, "# \t", PARSE_NORMAL & ~PARSE_EOL_COMMENTS))
break;
/* Fields: [-]regex uid:gid mode [alias] [cmd] */
- dbg("token1:'%s'", tokens[1]);
+ dbg3("token1:'%s'", tokens[1]);
/* 1st field */
val = tokens[0];
G.cur_rule.keep_matching = ('-' == val[0]);
val += G.cur_rule.keep_matching; /* swallow leading dash */
+ val = parse_envmatch_pfx(val);
if (val[0] == '@') {
/* @major,minor[-minor2] */
/* (useful when name is ambiguous:
if (sc == 2)
G.cur_rule.min1 = G.cur_rule.min0;
} else {
+ char *eq = strchr(val, '=');
if (val[0] == '$') {
- char *eq = strchr(++val, '=');
+ /* $ENVVAR=regex ... */
+ val++;
if (!eq) {
bb_error_msg("bad $envvar=regex on line %d", G.parser->lineno);
goto next_rule;
}
xregcomp(&G.cur_rule.match, val, REG_EXTENDED);
G.cur_rule.regex_compiled = 1;
- G.cur_rule.regex_has_slash = (strchr(val, '/') != NULL);
}
/* 2nd field: uid:gid - device ownership */
- if (get_uidgid(&G.cur_rule.ugid, tokens[1], /*allow_numeric:*/ 1) == 0) {
+ if (get_uidgid(&G.cur_rule.ugid, tokens[1]) == 0) {
bb_error_msg("unknown user/group '%s' on line %d", tokens[1], G.parser->lineno);
goto next_rule;
}
/* 3rd field: mode - device permissions */
- bb_parse_mode(tokens[2], &G.cur_rule.mode);
+ G.cur_rule.mode = bb_parse_mode(tokens[2], G.cur_rule.mode);
/* 4th field (opt): ">|=alias" or "!" to not create the node */
val = tokens[3];
clean_up_cur_rule();
} /* while (config_read) */
- dbg("config_close(G.parser)");
+ dbg3("config_close(G.parser)");
config_close(G.parser);
G.parser = NULL;
/* Open conf file if we didn't do it yet */
if (!G.parser && G.filename) {
- dbg("config_open('%s')", G.filename);
+ dbg3("config_open('%s')", G.filename);
G.parser = config_open2(G.filename, fopen_for_read);
G.filename = NULL;
}
/* mdev -s */
/* Do we have rule parsed already? */
if (G.rule_vec[G.rule_idx]) {
- dbg("< G.rule_vec[G.rule_idx:%d]=%p", G.rule_idx, G.rule_vec[G.rule_idx]);
+ dbg3("< G.rule_vec[G.rule_idx:%d]=%p", G.rule_idx, G.rule_vec[G.rule_idx]);
return G.rule_vec[G.rule_idx++];
}
make_default_cur_rule();
if (G.parser) {
parse_next_rule();
if (G.rule_vec) { /* mdev -s */
- rule = memcpy(xmalloc(sizeof(G.cur_rule)), &G.cur_rule, sizeof(G.cur_rule));
+ rule = xmemdup(&G.cur_rule, sizeof(G.cur_rule));
G.rule_vec = xrealloc_vector(G.rule_vec, 4, G.rule_idx);
G.rule_vec[G.rule_idx++] = rule;
- dbg("> G.rule_vec[G.rule_idx:%d]=%p", G.rule_idx, G.rule_vec[G.rule_idx]);
+ dbg3("> G.rule_vec[G.rule_idx:%d]=%p", G.rule_idx, G.rule_vec[G.rule_idx]);
}
}
return rule;
}
+static int env_matches(struct envmatch *e)
+{
+ while (e) {
+ int r;
+ char *val = getenv(e->envname);
+ if (!val)
+ return 0;
+ r = regexec(&e->match, val, /*size*/ 0, /*range[]*/ NULL, /*eflags*/ 0);
+ if (r != 0) /* no match */
+ return 0;
+ e = e->next;
+ }
+ return 1;
+}
+
#else
# define next_rule() (&G.cur_rule)
#endif
+static void mkdir_recursive(char *name)
+{
+ /* if name has many levels ("dir1/dir2"),
+ * bb_make_directory() will create dir1 according to umask,
+ * not according to its "mode" parameter.
+ * Since we run with umask=0, need to temporarily switch it.
+ */
+ umask(022); /* "dir1" (if any) will be 0755 too */
+ bb_make_directory(name, 0755, FILEUTILS_RECUR);
+ umask(0);
+}
+
/* Builds an alias path.
* This function potentionally reallocates the alias parameter.
* Only used for ENABLE_FEATURE_MDEV_RENAME
dest = strrchr(alias, '/');
if (dest) { /* ">bar/[baz]" ? */
*dest = '\0'; /* mkdir bar */
- bb_make_directory(alias, 0755, FILEUTILS_RECUR);
+ mkdir_recursive(alias);
*dest = '/';
if (dest[1] == '\0') { /* ">bar/" => ">bar/device_name" */
dest = alias;
/* mknod in /dev based on a path like "/sys/block/hda/hda1"
* NB1: path parameter needs to have SCRATCH_SIZE scratch bytes
- * after NUL, but we promise to not mangle (IOW: to restore if needed)
- * path string.
+ * after NUL, but we promise to not mangle it (IOW: to restore NUL if needed).
* NB2: "mdev -s" may call us many times, do not leak memory/fds!
+ *
+ * device_name = $DEVNAME (may be NULL)
+ * path = /sys/$DEVPATH
*/
-static void make_device(char *path, int delete)
+static void make_device(char *device_name, char *path, int operation)
{
- char *device_name, *subsystem_slash_devname;
int major, minor, type, len;
-
- dbg("%s('%s', delete:%d)", __func__, path, delete);
+ char *path_end = path + strlen(path);
/* Try to read major/minor string. Note that the kernel puts \n after
* the data, so we don't need to worry about null terminating the string
* We also depend on path having writeable space after it.
*/
major = -1;
- if (!delete) {
- char *dev_maj_min = path + strlen(path);
-
- strcpy(dev_maj_min, "/dev");
- len = open_read_close(path, dev_maj_min + 1, 64);
- *dev_maj_min = '\0';
+ if (operation == OP_add) {
+ strcpy(path_end, "/dev");
+ len = open_read_close(path, path_end + 1, SCRATCH_SIZE - 1);
+ *path_end = '\0';
if (len < 1) {
if (!ENABLE_FEATURE_MDEV_EXEC)
return;
/* no "dev" file, but we can still run scripts
* based on device name */
- } else if (sscanf(++dev_maj_min, "%u:%u", &major, &minor) != 2) {
+ } else if (sscanf(path_end + 1, "%u:%u", &major, &minor) == 2) {
+ dbg1("dev %u,%u", major, minor);
+ } else {
major = -1;
}
}
/* else: for delete, -1 still deletes the node, but < -1 suppresses that */
- /* Determine device name, type, major and minor */
- device_name = (char*) bb_basename(path);
- /* http://kernel.org/doc/pending/hotplug.txt says that only
+ /* Determine device name */
+ if (!device_name) {
+ /*
+ * There was no $DEVNAME envvar (for example, mdev -s never has).
+ * But it is very useful: it contains the *path*, not only basename,
+ * Thankfully, uevent file has it.
+ * Example of .../sound/card0/controlC0/uevent file on Linux-3.7.7:
+ * MAJOR=116
+ * MINOR=7
+ * DEVNAME=snd/controlC0
+ */
+ strcpy(path_end, "/uevent");
+ len = open_read_close(path, path_end + 1, SCRATCH_SIZE - 1);
+ if (len < 0)
+ len = 0;
+ *path_end = '\0';
+ path_end[1 + len] = '\0';
+ device_name = strstr(path_end + 1, "\nDEVNAME=");
+ if (device_name) {
+ device_name += sizeof("\nDEVNAME=")-1;
+ strchrnul(device_name, '\n')[0] = '\0';
+ } else {
+ /* Fall back to just basename */
+ device_name = (char*) bb_basename(path);
+ }
+ }
+ /* Determine device type */
+ /*
+ * http://kernel.org/doc/pending/hotplug.txt says that only
* "/sys/block/..." is for block devices. "/sys/bus" etc is not.
* But since 2.6.25 block devices are also in /sys/class/block.
- * We use strstr("/block/") to forestall future surprises. */
+ * We use strstr("/block/") to forestall future surprises.
+ */
type = S_IFCHR;
- if (strstr(path, "/block/") || (G.subsystem && strncmp(G.subsystem, "block", 5) == 0))
+ if (strstr(path, "/block/") || (G.subsystem && is_prefixed_with(G.subsystem, "block")))
type = S_IFBLK;
- /* Make path point to "subsystem/device_name" */
- subsystem_slash_devname = NULL;
- /* Check for coldplug invocations first */
- if (strncmp(path, "/sys/block/", 11) == 0) /* legacy case */
- path += sizeof("/sys/") - 1;
- else if (strncmp(path, "/sys/class/", 11) == 0)
- path += sizeof("/sys/class/") - 1;
- else {
- /* Example of a hotplug invocation:
- * SUBSYSTEM="block"
- * DEVPATH="/sys" + "/devices/virtual/mtd/mtd3/mtdblock3"
- * ("/sys" is added by mdev_main)
- * - path does not contain subsystem
- */
- subsystem_slash_devname = concat_path_file(G.subsystem, device_name);
- path = subsystem_slash_devname;
- }
-
#if ENABLE_FEATURE_MDEV_CONF
G.rule_idx = 0; /* restart from the beginning (think mdev -s) */
#endif
char *command;
char *alias;
char aliaslink = aliaslink; /* for compiler */
- const char *node_name;
+ char *node_name;
const struct rule *rule;
- str_to_match = "";
+ str_to_match = device_name;
rule = next_rule();
#if ENABLE_FEATURE_MDEV_CONF
+ if (!env_matches(rule->envmatch))
+ continue;
if (rule->maj >= 0) { /* @maj,min rule */
if (major != rule->maj)
continue;
}
if (rule->envvar) { /* $envvar=regex rule */
str_to_match = getenv(rule->envvar);
- dbg("getenv('%s'):'%s'", rule->envvar, str_to_match);
+ dbg3("getenv('%s'):'%s'", rule->envvar, str_to_match);
if (!str_to_match)
continue;
- } else {
- /* regex to match [subsystem/]device_name */
- str_to_match = (rule->regex_has_slash ? path : device_name);
}
+ /* else: str_to_match = device_name */
if (rule->regex_compiled) {
int regex_match = regexec(&rule->match, str_to_match, ARRAY_SIZE(off), off, 0);
- dbg("regex_match for '%s':%d", str_to_match, regex_match);
+ dbg3("regex_match for '%s':%d", str_to_match, regex_match);
//bb_error_msg("matches:");
//for (int i = 0; i < ARRAY_SIZE(off); i++) {
// if (off[i].rm_so < 0) continue;
}
}
/* else: it's final implicit "match-all" rule */
-#endif
-
rule_matches:
- dbg("rule matched");
-
+ dbg2("rule matched, line %d", G.parser ? G.parser->lineno : -1);
+#endif
/* Build alias name */
alias = NULL;
if (ENABLE_FEATURE_MDEV_RENAME && rule->ren_mov) {
}
}
}
- dbg("alias:'%s'", alias);
+ dbg3("alias:'%s'", alias);
command = NULL;
IF_FEATURE_MDEV_EXEC(command = rule->r_cmd;)
if (command) {
- const char *s = "$@*";
- const char *s2 = strchr(s, command[0]);
-
/* Are we running this command now?
- * Run $cmd on delete, @cmd on create, *cmd on both
+ * Run @cmd on create, $cmd on delete, *cmd on any
*/
- if (s2 - s != delete) {
- /* We are here if: '*',
- * or: '@' and delete = 0,
- * or: '$' and delete = 1
- */
+ if ((command[0] == '@' && operation == OP_add)
+ || (command[0] == '$' && operation == OP_remove)
+ || (command[0] == '*')
+ ) {
command++;
} else {
command = NULL;
}
}
- dbg("command:'%s'", command);
+ dbg3("command:'%s'", command);
/* "Execute" the line we found */
node_name = device_name;
if (ENABLE_FEATURE_MDEV_RENAME && alias) {
node_name = alias = build_alias(alias, device_name);
- dbg("alias2:'%s'", alias);
+ dbg3("alias2:'%s'", alias);
}
- if (!delete && major >= 0) {
- dbg("mknod('%s',%o,(%d,%d))", node_name, rule->mode | type, major, minor);
+ if (operation == OP_add && major >= 0) {
+ char *slash = strrchr(node_name, '/');
+ if (slash) {
+ *slash = '\0';
+ mkdir_recursive(node_name);
+ *slash = '/';
+ }
+ if (ENABLE_FEATURE_MDEV_CONF) {
+ dbg1("mknod %s (%d,%d) %o"
+ " %u:%u",
+ node_name, major, minor, rule->mode | type,
+ rule->ugid.uid, rule->ugid.gid
+ );
+ } else {
+ dbg1("mknod %s (%d,%d) %o",
+ node_name, major, minor, rule->mode | type
+ );
+ }
if (mknod(node_name, rule->mode | type, makedev(major, minor)) && errno != EEXIST)
bb_perror_msg("can't create '%s'", node_name);
- if (major == G.root_major && minor == G.root_minor)
- symlink(node_name, "root");
if (ENABLE_FEATURE_MDEV_CONF) {
chmod(node_name, rule->mode);
chown(node_name, rule->ugid.uid, rule->ugid.gid);
}
+ if (major == G.root_major && minor == G.root_minor)
+ symlink(node_name, "root");
if (ENABLE_FEATURE_MDEV_RENAME && alias) {
- if (aliaslink == '>')
+ if (aliaslink == '>') {
+//TODO: on devtmpfs, device_name already exists and symlink() fails.
+//End result is that instead of symlink, we have two nodes.
+//What should be done?
+ dbg1("symlink: %s", device_name);
symlink(node_name, device_name);
+ }
}
}
if (ENABLE_FEATURE_MDEV_EXEC && command) {
/* setenv will leak memory, use putenv/unsetenv/free */
char *s = xasprintf("%s=%s", "MDEV", node_name);
- char *s1 = xasprintf("%s=%s", "SUBSYSTEM", G.subsystem);
putenv(s);
- putenv(s1);
+ dbg1("running: %s", command);
if (system(command) == -1)
bb_perror_msg("can't run '%s'", command);
- bb_unsetenv_and_free(s1);
bb_unsetenv_and_free(s);
}
- if (delete && major >= -1) {
+ if (operation == OP_remove && major >= -1) {
if (ENABLE_FEATURE_MDEV_RENAME && alias) {
- if (aliaslink == '>')
+ if (aliaslink == '>') {
+ dbg1("unlink: %s", device_name);
unlink(device_name);
+ }
}
+ dbg1("unlink: %s", node_name);
unlink(node_name);
}
if (!ENABLE_FEATURE_MDEV_CONF || !rule->keep_matching)
break;
} /* for (;;) */
-
- free(subsystem_slash_devname);
}
-/* File callback for /sys/ traversal */
+/* File callback for /sys/ traversal.
+ * We act only on "/sys/.../dev" (pseudo)file
+ */
static int FAST_FUNC fileAction(const char *fileName,
struct stat *statbuf UNUSED_PARAM,
void *userData,
int depth UNUSED_PARAM)
{
size_t len = strlen(fileName) - 4; /* can't underflow */
- char *scratch = userData;
-
- /* len check is for paranoid reasons */
- if (strcmp(fileName + len, "/dev") != 0 || len >= PATH_MAX)
- return FALSE;
+ char *path = userData; /* char array[PATH_MAX + SCRATCH_SIZE] */
+ char subsys[PATH_MAX];
+ int res;
+
+ /* Is it a ".../dev" file? (len check is for paranoid reasons) */
+ if (strcmp(fileName + len, "/dev") != 0 || len >= PATH_MAX - 32)
+ return FALSE; /* not .../dev */
+
+ strcpy(path, fileName);
+ path[len] = '\0';
+
+ /* Read ".../subsystem" symlink in the same directory where ".../dev" is */
+ strcpy(subsys, path);
+ strcpy(subsys + len, "/subsystem");
+ res = readlink(subsys, subsys, sizeof(subsys)-1);
+ if (res > 0) {
+ subsys[res] = '\0';
+ free(G.subsystem);
+ if (G.subsys_env) {
+ bb_unsetenv_and_free(G.subsys_env);
+ G.subsys_env = NULL;
+ }
+ /* Set G.subsystem and $SUBSYSTEM from symlink's last component */
+ G.subsystem = strrchr(subsys, '/');
+ if (G.subsystem) {
+ G.subsystem = xstrdup(G.subsystem + 1);
+ G.subsys_env = xasprintf("%s=%s", "SUBSYSTEM", G.subsystem);
+ putenv(G.subsys_env);
+ }
+ }
- strcpy(scratch, fileName);
- scratch[len] = '\0';
- make_device(scratch, /*delete:*/ 0);
+ make_device(/*DEVNAME:*/ NULL, path, OP_add);
return TRUE;
}
void *userData UNUSED_PARAM,
int depth)
{
- /* Extract device subsystem -- the name of the directory
- * under /sys/class/ */
- if (1 == depth) {
- free(G.subsystem);
- G.subsystem = strrchr(fileName, '/');
- if (G.subsystem)
- G.subsystem = xstrdup(G.subsystem + 1);
- }
-
return (depth >= MAX_SYSFS_DEPTH ? SKIP : TRUE);
}
static void load_firmware(const char *firmware, const char *sysfs_path)
{
int cnt;
- int firmware_fd, loading_fd, data_fd;
+ int firmware_fd, loading_fd;
/* check for /lib/firmware/$FIRMWARE */
- xchdir("/lib/firmware");
- firmware_fd = xopen(firmware, O_RDONLY);
-
- /* in case we goto out ... */
- data_fd = -1;
+ firmware_fd = -1;
+ if (chdir("/lib/firmware") == 0)
+ firmware_fd = open(firmware, O_RDONLY); /* can fail */
/* check for /sys/$DEVPATH/loading ... give 30 seconds to appear */
xchdir(sysfs_path);
for (cnt = 0; cnt < 30; ++cnt) {
loading_fd = open("loading", O_WRONLY);
- if (loading_fd != -1)
+ if (loading_fd >= 0)
goto loading;
sleep(1);
}
goto out;
loading:
- /* tell kernel we're loading by "echo 1 > /sys/$DEVPATH/loading" */
- if (full_write(loading_fd, "1", 1) != 1)
- goto out;
-
- /* load firmware into /sys/$DEVPATH/data */
- data_fd = open("data", O_WRONLY);
- if (data_fd == -1)
- goto out;
- cnt = bb_copyfd_eof(firmware_fd, data_fd);
+ cnt = 0;
+ if (firmware_fd >= 0) {
+ int data_fd;
+
+ /* tell kernel we're loading by "echo 1 > /sys/$DEVPATH/loading" */
+ if (full_write(loading_fd, "1", 1) != 1)
+ goto out;
+
+ /* load firmware into /sys/$DEVPATH/data */
+ data_fd = open("data", O_WRONLY);
+ if (data_fd < 0)
+ goto out;
+ cnt = bb_copyfd_eof(firmware_fd, data_fd);
+ if (ENABLE_FEATURE_CLEAN_UP)
+ close(data_fd);
+ }
- /* tell kernel result by "echo [0|-1] > /sys/$DEVPATH/loading" */
+ /* Tell kernel result by "echo [0|-1] > /sys/$DEVPATH/loading"
+ * Note: we emit -1 also if firmware file wasn't found.
+ * There are cases when otherwise kernel would wait for minutes
+ * before timing out.
+ */
if (cnt > 0)
full_write(loading_fd, "0", 1);
else
full_write(loading_fd, "-1", 2);
out:
+ xchdir("/dev");
if (ENABLE_FEATURE_CLEAN_UP) {
close(firmware_fd);
close(loading_fd);
- close(data_fd);
+ }
+}
+
+static char *curtime(void)
+{
+ struct timeval tv;
+ gettimeofday(&tv, NULL);
+ sprintf(
+ strftime_HHMMSS(G.timestr, sizeof(G.timestr), &tv.tv_sec),
+ ".%06u",
+ (unsigned)tv.tv_usec
+ );
+ return G.timestr;
+}
+
+static void open_mdev_log(const char *seq, unsigned my_pid)
+{
+ int logfd = open("mdev.log", O_WRONLY | O_APPEND);
+ if (logfd >= 0) {
+ xmove_fd(logfd, STDERR_FILENO);
+ G.verbose = 2;
+ applet_name = xasprintf("%s[%s]", applet_name, seq ? seq : utoa(my_pid));
+ }
+}
+
+/* If it exists, does /dev/mdev.seq match $SEQNUM?
+ * If it does not match, earlier mdev is running
+ * in parallel, and we need to wait.
+ * Active mdev pokes us with SIGCHLD to check the new file.
+ */
+static int
+wait_for_seqfile(unsigned expected_seq)
+{
+ /* We time out after 2 sec */
+ static const struct timespec ts = { 0, 32*1000*1000 };
+ int timeout = 2000 / 32;
+ int seq_fd = -1;
+ int do_once = 1;
+ sigset_t set_CHLD;
+
+ sigemptyset(&set_CHLD);
+ sigaddset(&set_CHLD, SIGCHLD);
+ sigprocmask(SIG_BLOCK, &set_CHLD, NULL);
+
+ for (;;) {
+ int seqlen;
+ char seqbuf[sizeof(long)*3 + 2];
+ unsigned seqbufnum;
+
+ if (seq_fd < 0) {
+ seq_fd = open("mdev.seq", O_RDWR);
+ if (seq_fd < 0)
+ break;
+ close_on_exec_on(seq_fd);
+ }
+ seqlen = pread(seq_fd, seqbuf, sizeof(seqbuf) - 1, 0);
+ if (seqlen < 0) {
+ close(seq_fd);
+ seq_fd = -1;
+ break;
+ }
+ seqbuf[seqlen] = '\0';
+ if (seqbuf[0] == '\n' || seqbuf[0] == '\0') {
+ /* seed file: write out seq ASAP */
+ xwrite_str(seq_fd, utoa(expected_seq));
+ xlseek(seq_fd, 0, SEEK_SET);
+ dbg2("first seq written");
+ break;
+ }
+ seqbufnum = atoll(seqbuf);
+ if (seqbufnum == expected_seq) {
+ /* correct idx */
+ break;
+ }
+ if (seqbufnum > expected_seq) {
+ /* a later mdev runs already (this was seen by users to happen) */
+ /* do not overwrite seqfile on exit */
+ close(seq_fd);
+ seq_fd = -1;
+ break;
+ }
+ if (do_once) {
+ dbg2("%s mdev.seq='%s', need '%u'", curtime(), seqbuf, expected_seq);
+ do_once = 0;
+ }
+ if (sigtimedwait(&set_CHLD, NULL, &ts) >= 0) {
+ dbg3("woken up");
+ continue; /* don't decrement timeout! */
+ }
+ if (--timeout == 0) {
+ dbg1("%s mdev.seq='%s'", "timed out", seqbuf);
+ break;
+ }
+ }
+ sigprocmask(SIG_UNBLOCK, &set_CHLD, NULL);
+ return seq_fd;
+}
+
+static void signal_mdevs(unsigned my_pid)
+{
+ procps_status_t* p = NULL;
+ while ((p = procps_scan(p, PSSCAN_ARGV0)) != NULL) {
+ if (p->pid != my_pid
+ && p->argv0
+ && strcmp(bb_basename(p->argv0), "mdev") == 0
+ ) {
+ kill(p->pid, SIGCHLD);
+ }
}
}
xchdir("/dev");
if (argv[1] && strcmp(argv[1], "-s") == 0) {
- /* Scan:
- * mdev -s
+ /*
+ * Scan: mdev -s
*/
struct stat st;
G.root_major = major(st.st_dev);
G.root_minor = minor(st.st_dev);
- /* ACTION_FOLLOWLINKS is needed since in newer kernels
- * /sys/block/loop* (for example) are symlinks to dirs,
- * not real directories.
- * (kernel's CONFIG_SYSFS_DEPRECATED makes them real dirs,
- * but we can't enforce that on users)
- */
- if (access("/sys/class/block", F_OK) != 0) {
- /* Scan obsolete /sys/block only if /sys/class/block
- * doesn't exist. Otherwise we'll have dupes.
- * Also, do not complain if it doesn't exist.
- * Some people configure kernel to have no blockdevs.
- */
- recursive_action("/sys/block",
- ACTION_RECURSE | ACTION_FOLLOWLINKS | ACTION_QUIET,
- fileAction, dirAction, temp, 0);
- }
- recursive_action("/sys/class",
- ACTION_RECURSE | ACTION_FOLLOWLINKS,
- fileAction, dirAction, temp, 0);
+ putenv((char*)"ACTION=add");
+
+ /* Create all devices from /sys/dev hierarchy */
+ recursive_action("/sys/dev",
+ ACTION_RECURSE | ACTION_FOLLOWLINKS,
+ fileAction, dirAction, temp, 0);
} else {
char *fw;
char *seq;
char *action;
- char *env_path;
- static const char keywords[] ALIGN1 = "remove\0add\0";
- enum { OP_remove = 0, OP_add };
+ char *env_devname;
+ char *env_devpath;
+ unsigned my_pid;
+ unsigned seqnum = seqnum; /* for compiler */
+ int seq_fd;
smalluint op;
/* Hotplug:
* env ACTION=... DEVPATH=... SUBSYSTEM=... [SEQNUM=...] mdev
- * ACTION can be "add" or "remove"
+ * ACTION can be "add", "remove", "change"
* DEVPATH is like "/block/sda" or "/class/input/mice"
*/
- action = getenv("ACTION");
- env_path = getenv("DEVPATH");
+ env_devname = getenv("DEVNAME"); /* can be NULL */
G.subsystem = getenv("SUBSYSTEM");
- if (!action || !env_path /*|| !G.subsystem*/)
+ action = getenv("ACTION");
+ env_devpath = getenv("DEVPATH");
+ if (!action || !env_devpath /*|| !G.subsystem*/)
bb_show_usage();
fw = getenv("FIRMWARE");
- op = index_in_strings(keywords, action);
- /* If it exists, does /dev/mdev.seq match $SEQNUM?
- * If it does not match, earlier mdev is running
- * in parallel, and we need to wait */
seq = getenv("SEQNUM");
+ op = index_in_strings(keywords, action);
+
+ my_pid = getpid();
+ open_mdev_log(seq, my_pid);
+
+ seq_fd = -1;
if (seq) {
- int timeout = 2000 / 32; /* 2000 msec */
- do {
- int seqlen;
- char seqbuf[sizeof(int)*3 + 2];
-
- seqlen = open_read_close("mdev.seq", seqbuf, sizeof(seqbuf-1));
- if (seqlen < 0) {
- seq = NULL;
- break;
- }
- seqbuf[seqlen] = '\0';
- if (seqbuf[0] == '\n' /* seed file? */
- || strcmp(seq, seqbuf) == 0 /* correct idx? */
- ) {
- break;
- }
- usleep(32*1000);
- } while (--timeout);
+ seqnum = atoll(seq);
+ seq_fd = wait_for_seqfile(seqnum);
}
- snprintf(temp, PATH_MAX, "/sys%s", env_path);
+ dbg1("%s "
+ "ACTION:%s SUBSYSTEM:%s DEVNAME:%s DEVPATH:%s"
+ "%s%s",
+ curtime(),
+ action, G.subsystem, env_devname, env_devpath,
+ fw ? " FW:" : "", fw ? fw : ""
+ );
+
+ snprintf(temp, PATH_MAX, "/sys%s", env_devpath);
if (op == OP_remove) {
/* Ignoring "remove firmware". It was reported
* to happen and to cause erroneous deletion
* of device nodes. */
if (!fw)
- make_device(temp, /*delete:*/ 1);
+ make_device(env_devname, temp, op);
}
- else if (op == OP_add) {
- make_device(temp, /*delete:*/ 0);
+ else {
+ make_device(env_devname, temp, op);
if (ENABLE_FEATURE_MDEV_LOAD_FIRMWARE) {
- if (fw)
+ if (op == OP_add && fw)
load_firmware(fw, temp);
}
}
- if (seq) {
- xopen_xwrite_close("mdev.seq", utoa(xatou(seq) + 1));
+ dbg1("%s exiting", curtime());
+ if (seq_fd >= 0) {
+ xwrite_str(seq_fd, utoa(seqnum + 1));
+ signal_mdevs(my_pid);
}
}