zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/app/busybox/src/util-linux/mdev.c b/ap/app/busybox/src/util-linux/mdev.c
new file mode 100644
index 0000000..75de14f
--- /dev/null
+++ b/ap/app/busybox/src/util-linux/mdev.c
@@ -0,0 +1,955 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * mdev - Mini udev for busybox
+ *
+ * Copyright 2005 Rob Landley <rob@landley.net>
+ * Copyright 2005 Frank Sorenson <frank@tuxrocks.com>
+ *
+ * Licensed under GPLv2, see file LICENSE in this source tree.
+ */
+
+//config:config MDEV
+//config: bool "mdev"
+//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:
+//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:
+//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:
+//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:
+//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:
+//config: For more information, please see docs/mdev.txt
+//config:
+//config:config FEATURE_MDEV_LOAD_FIRMWARE
+//config: bool "Support loading of firmwares"
+//config: default y
+//config: depends on MDEV
+//config: help
+//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.
+
+//applet:IF_MDEV(APPLET(mdev, BB_DIR_SBIN, BB_SUID_DROP))
+
+//kbuild:lib-$(CONFIG_MDEV) += mdev.o
+
+//usage:#define mdev_trivial_usage
+//usage: "[-s]"
+//usage:#define mdev_full_usage "\n\n"
+//usage: "mdev -s is to be run during boot to scan /sys and populate /dev.\n"
+//usage: "\n"
+//usage: "Bare mdev is a kernel hotplug helper. To activate it:\n"
+//usage: " echo /sbin/mdev >/proc/sys/kernel/hotplug\n"
+//usage: IF_FEATURE_MDEV_CONF(
+//usage: "\n"
+//usage: "It uses /etc/mdev.conf with lines\n"
+//usage: " [-]DEVNAME UID:GID PERM"
+//usage: IF_FEATURE_MDEV_RENAME(" [>|=PATH]|[!]")
+//usage: IF_FEATURE_MDEV_EXEC(" [@|$|*PROG]")
+//usage: "\n"
+//usage: "where DEVNAME is device name regex, @major,minor[-minor2], or\n"
+//usage: "environment variable regex. A common use of the latter is\n"
+//usage: "to load modules for hotplugged devices:\n"
+//usage: " $MODALIAS=.* 0:0 660 @modprobe \"$MODALIAS\"\n"
+//usage: )
+//usage: "\n"
+//usage: "If /dev/mdev.seq file exists, mdev will wait for its value\n"
+//usage: "to match $SEQNUM variable. This prevents plug/unplug races.\n"
+//usage: "To activate this feature, create empty /dev/mdev.seq at boot.\n"
+//usage: "\n"
+//usage: "If /dev/mdev.log file exists, debug log will be appended to it."
+
+#include "libbb.h"
+#include "xregex.h"
+
+/* "mdev -s" scans /sys/class/xxx, looking for directories which have dev
+ * file (it is of the form "M:m\n"). Example: /sys/class/tty/tty0/dev
+ * contains "4:0\n". Directory name is taken as device name, path component
+ * directly after /sys/class/ as subsystem. In this example, "tty0" and "tty".
+ * Then mdev creates the /dev/device_name node.
+ * If /sys/class/.../dev file does not exist, mdev still may act
+ * on this device: see "@|$|*command args..." parameter in config file.
+ *
+ * mdev w/o parameters is called as hotplug helper. It takes device
+ * and subsystem names from $DEVPATH and $SUBSYSTEM, extracts
+ * maj,min from "/sys/$DEVPATH/dev" and also examines
+ * $ACTION ("add"/"delete") and $FIRMWARE.
+ *
+ * If action is "add", mdev creates /dev/device_name similarly to mdev -s.
+ * (todo: explain "delete" and $FIRMWARE)
+ *
+ * If /etc/mdev.conf exists, it may modify /dev/device_name's properties.
+ *
+ * Leading minus in 1st field means "don't stop on this line", otherwise
+ * search is stopped after the matching line is encountered.
+ *
+ * $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
+ * to load the module and exit:
+ * $MODALIAS=.* 0:0 660 @modprobe "$MODALIAS"
+ * The kernel will generate another hotplug event when /sys/class/.../dev
+ * file appears.
+ *
+ * When line matches, the device node is created, chmod'ed and chown'ed,
+ * moved to path, and if >path, a symlink to moved node is created,
+ * all this if /sys/class/.../dev exists.
+ * Examples:
+ * =loop/ - moves to /dev/loop
+ * >disk/sda%1 - moves to /dev/disk/sdaN, makes /dev/sdaN a symlink
+ *
+ * Then "command args..." is executed (via sh -c 'command args...').
+ * @:execute on creation, $:on deletion, *:on both.
+ * 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
+ */
+
+static const char keywords[] ALIGN1 = "add\0remove\0change\0";
+enum { OP_add, OP_remove };
+
+struct rule {
+ bool keep_matching;
+ bool regex_compiled;
+ mode_t mode;
+ int maj, min0, min1;
+ struct bb_uidgid_t ugid;
+ char *envvar;
+ char *ren_mov;
+ IF_FEATURE_MDEV_EXEC(char *r_cmd;)
+ regex_t match;
+};
+
+struct globals {
+ int root_major, root_minor;
+ smallint verbose;
+ char *subsystem;
+#if ENABLE_FEATURE_MDEV_CONF
+ const char *filename;
+ parser_t *parser;
+ struct rule **rule_vec;
+ unsigned rule_idx;
+#endif
+ struct rule cur_rule;
+} FIX_ALIASING;
+#define G (*(struct globals*)&bb_common_bufsiz1)
+#define INIT_G() do { \
+ 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
+
+
+#if ENABLE_FEATURE_MDEV_CONF
+
+static void make_default_cur_rule(void)
+{
+ memset(&G.cur_rule, 0, sizeof(G.cur_rule));
+ G.cur_rule.maj = -1; /* "not a @major,minor rule" */
+ G.cur_rule.mode = 0660;
+}
+
+static void clean_up_cur_rule(void)
+{
+ free(G.cur_rule.envvar);
+ 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);)
+ make_default_cur_rule();
+}
+
+static void parse_next_rule(void)
+{
+ /* Note: on entry, G.cur_rule is set to default */
+ while (1) {
+ char *tokens[4];
+ char *val;
+
+ /* 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]);
+
+ /* 1st field */
+ val = tokens[0];
+ G.cur_rule.keep_matching = ('-' == val[0]);
+ val += G.cur_rule.keep_matching; /* swallow leading dash */
+ if (val[0] == '@') {
+ /* @major,minor[-minor2] */
+ /* (useful when name is ambiguous:
+ * "/sys/class/usb/lp0" and
+ * "/sys/class/printer/lp0")
+ */
+ int sc = sscanf(val, "@%u,%u-%u", &G.cur_rule.maj, &G.cur_rule.min0, &G.cur_rule.min1);
+ if (sc < 2 || G.cur_rule.maj < 0) {
+ bb_error_msg("bad @maj,min on line %d", G.parser->lineno);
+ goto next_rule;
+ }
+ if (sc == 2)
+ G.cur_rule.min1 = G.cur_rule.min0;
+ } else {
+ if (val[0] == '$') {
+ char *eq = strchr(++val, '=');
+ if (!eq) {
+ bb_error_msg("bad $envvar=regex on line %d", G.parser->lineno);
+ goto next_rule;
+ }
+ G.cur_rule.envvar = xstrndup(val, eq - val);
+ val = eq + 1;
+ }
+ xregcomp(&G.cur_rule.match, val, REG_EXTENDED);
+ G.cur_rule.regex_compiled = 1;
+ }
+
+ /* 2nd field: uid:gid - device ownership */
+ if (get_uidgid(&G.cur_rule.ugid, tokens[1], /*allow_numeric:*/ 1) == 0) {
+ bb_error_msg("unknown user/group '%s' on line %d", tokens[1], G.parser->lineno);
+ goto next_rule;
+ }
+
+ /* 3rd field: mode - device permissions */
+ bb_parse_mode(tokens[2], &G.cur_rule.mode);
+
+ /* 4th field (opt): ">|=alias" or "!" to not create the node */
+ val = tokens[3];
+ if (ENABLE_FEATURE_MDEV_RENAME && val && strchr(">=!", val[0])) {
+ char *s = skip_non_whitespace(val);
+ G.cur_rule.ren_mov = xstrndup(val, s - val);
+ val = skip_whitespace(s);
+ }
+
+ if (ENABLE_FEATURE_MDEV_EXEC && val && val[0]) {
+ const char *s = "$@*";
+ const char *s2 = strchr(s, val[0]);
+ if (!s2) {
+ bb_error_msg("bad line %u", G.parser->lineno);
+ goto next_rule;
+ }
+ IF_FEATURE_MDEV_EXEC(G.cur_rule.r_cmd = xstrdup(val);)
+ }
+
+ return;
+ next_rule:
+ clean_up_cur_rule();
+ } /* while (config_read) */
+
+ dbg("config_close(G.parser)");
+ config_close(G.parser);
+ G.parser = NULL;
+
+ return;
+}
+
+/* If mdev -s, we remember rules in G.rule_vec[].
+ * Otherwise, there is no point in doing it, and we just
+ * save only one parsed rule in G.cur_rule.
+ */
+static const struct rule *next_rule(void)
+{
+ struct rule *rule;
+
+ /* Open conf file if we didn't do it yet */
+ if (!G.parser && G.filename) {
+ dbg("config_open('%s')", G.filename);
+ G.parser = config_open2(G.filename, fopen_for_read);
+ G.filename = NULL;
+ }
+
+ if (G.rule_vec) {
+ /* 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]);
+ return G.rule_vec[G.rule_idx++];
+ }
+ make_default_cur_rule();
+ } else {
+ /* not mdev -s */
+ clean_up_cur_rule();
+ }
+
+ /* Parse one more rule if file isn't fully read */
+ rule = &G.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));
+ 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]);
+ }
+ }
+
+ return rule;
+}
+
+#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
+ */
+static char *build_alias(char *alias, const char *device_name)
+{
+ char *dest;
+
+ /* ">bar/": rename to bar/device_name */
+ /* ">bar[/]baz": rename to bar[/]baz */
+ dest = strrchr(alias, '/');
+ if (dest) { /* ">bar/[baz]" ? */
+ *dest = '\0'; /* mkdir bar */
+ mkdir_recursive(alias);
+ *dest = '/';
+ if (dest[1] == '\0') { /* ">bar/" => ">bar/device_name" */
+ dest = alias;
+ alias = concat_path_file(alias, device_name);
+ free(dest);
+ }
+ }
+
+ return 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.
+ * 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 *device_name, char *path, int operation)
+{
+ int major, minor, type, len;
+
+ if (G.verbose)
+ bb_error_msg("device: %s, %s", device_name, 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
+ * because sscanf() will stop at the first nondigit, which \n is.
+ * We also depend on path having writeable space after it.
+ */
+ major = -1;
+ if (operation == OP_add) {
+ 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 (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) {
+ if (G.verbose)
+ bb_error_msg("maj,min: %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 */
+ if (!device_name)
+ device_name = (char*) bb_basename(path);
+ /* 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.
+ */
+ type = S_IFCHR;
+ if (strstr(path, "/block/") || (G.subsystem && strncmp(G.subsystem, "block", 5) == 0))
+ type = S_IFBLK;
+
+#if ENABLE_FEATURE_MDEV_CONF
+ G.rule_idx = 0; /* restart from the beginning (think mdev -s) */
+#endif
+ for (;;) {
+ const char *str_to_match;
+ regmatch_t off[1 + 9 * ENABLE_FEATURE_MDEV_RENAME_REGEXP];
+ char *command;
+ char *alias;
+ char aliaslink = aliaslink; /* for compiler */
+ char *node_name;
+ const struct rule *rule;
+
+ str_to_match = device_name;
+
+ rule = next_rule();
+
+#if ENABLE_FEATURE_MDEV_CONF
+ if (rule->maj >= 0) { /* @maj,min rule */
+ if (major != rule->maj)
+ continue;
+ if (minor < rule->min0 || minor > rule->min1)
+ continue;
+ memset(off, 0, sizeof(off));
+ goto rule_matches;
+ }
+ if (rule->envvar) { /* $envvar=regex rule */
+ str_to_match = getenv(rule->envvar);
+ dbg("getenv('%s'):'%s'", rule->envvar, str_to_match);
+ if (!str_to_match)
+ continue;
+ }
+ /* else: str_to_match = device_name */
+
+ if (rule->regex_compiled) {
+ int regex_match = regexec(&rule->match, str_to_match, ARRAY_SIZE(off), off, 0);
+ dbg("regex_match for '%s':%d", str_to_match, regex_match);
+ //bb_error_msg("matches:");
+ //for (int i = 0; i < ARRAY_SIZE(off); i++) {
+ // if (off[i].rm_so < 0) continue;
+ // bb_error_msg("match %d: '%.*s'\n", i,
+ // (int)(off[i].rm_eo - off[i].rm_so),
+ // device_name + off[i].rm_so);
+ //}
+
+ if (regex_match != 0
+ /* regexec returns whole pattern as "range" 0 */
+ || off[0].rm_so != 0
+ || (int)off[0].rm_eo != (int)strlen(str_to_match)
+ ) {
+ continue; /* this rule doesn't match */
+ }
+ }
+ /* else: it's final implicit "match-all" rule */
+ rule_matches:
+#endif
+ dbg("rule matched");
+
+ /* Build alias name */
+ alias = NULL;
+ if (ENABLE_FEATURE_MDEV_RENAME && rule->ren_mov) {
+ aliaslink = rule->ren_mov[0];
+ if (aliaslink == '!') {
+ /* "!": suppress node creation/deletion */
+ major = -2;
+ }
+ else if (aliaslink == '>' || aliaslink == '=') {
+ if (ENABLE_FEATURE_MDEV_RENAME_REGEXP) {
+ char *s;
+ char *p;
+ unsigned n;
+
+ /* substitute %1..9 with off[1..9], if any */
+ n = 0;
+ s = rule->ren_mov;
+ while (*s)
+ if (*s++ == '%')
+ n++;
+
+ p = alias = xzalloc(strlen(rule->ren_mov) + n * strlen(str_to_match));
+ s = rule->ren_mov + 1;
+ while (*s) {
+ *p = *s;
+ if ('%' == *s) {
+ unsigned i = (s[1] - '0');
+ if (i <= 9 && off[i].rm_so >= 0) {
+ n = off[i].rm_eo - off[i].rm_so;
+ strncpy(p, str_to_match + off[i].rm_so, n);
+ p += n - 1;
+ s++;
+ }
+ }
+ p++;
+ s++;
+ }
+ } else {
+ alias = xstrdup(rule->ren_mov + 1);
+ }
+ }
+ }
+ dbg("alias:'%s'", alias);
+
+ command = NULL;
+ IF_FEATURE_MDEV_EXEC(command = rule->r_cmd;)
+ if (command) {
+ const char *s = "$@*";
+ const char *s2 = strchr(s, command[0]);
+
+ /* Are we running this command now?
+ * Run $cmd on delete, @cmd on create, *cmd on both
+ */
+ if (s2 - s != (operation == OP_remove) || *s2 == '*') {
+ /* We are here if: '*',
+ * or: '@' and delete = 0,
+ * or: '$' and delete = 1
+ */
+ command++;
+ } else {
+ command = NULL;
+ }
+ }
+ dbg("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);
+ }
+
+ if (operation == OP_add && major >= 0) {
+ char *slash = strrchr(node_name, '/');
+ if (slash) {
+ *slash = '\0';
+ mkdir_recursive(node_name);
+ *slash = '/';
+ }
+ if (G.verbose)
+ bb_error_msg("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 (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 == '>') {
+//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?
+ if (G.verbose)
+ bb_error_msg("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);
+ if (G.verbose)
+ bb_error_msg("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 (operation == OP_remove && major >= -1) {
+ if (ENABLE_FEATURE_MDEV_RENAME && alias) {
+ if (aliaslink == '>') {
+ if (G.verbose)
+ bb_error_msg("unlink: %s", device_name);
+ unlink(device_name);
+ }
+ }
+ if (G.verbose)
+ bb_error_msg("unlink: %s", node_name);
+ unlink(node_name);
+ }
+
+ if (ENABLE_FEATURE_MDEV_RENAME)
+ free(alias);
+
+ /* We found matching line.
+ * Stop unless it was prefixed with '-'
+ */
+ if (!ENABLE_FEATURE_MDEV_CONF || !rule->keep_matching)
+ break;
+ } /* for (;;) */
+}
+
+/* File callback for /sys/ traversal */
+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;
+
+ strcpy(scratch, fileName);
+ scratch[len] = '\0';
+ make_device(/*DEVNAME:*/ NULL, scratch, OP_add);
+
+ return TRUE;
+}
+
+/* Directory callback for /sys/ traversal */
+static int FAST_FUNC dirAction(const char *fileName UNUSED_PARAM,
+ struct stat *statbuf UNUSED_PARAM,
+ 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);
+}
+
+/* For the full gory details, see linux/Documentation/firmware_class/README
+ *
+ * Firmware loading works like this:
+ * - kernel sets FIRMWARE env var
+ * - userspace checks /lib/firmware/$FIRMWARE
+ * - userspace waits for /sys/$DEVPATH/loading to appear
+ * - userspace writes "1" to /sys/$DEVPATH/loading
+ * - userspace copies /lib/firmware/$FIRMWARE into /sys/$DEVPATH/data
+ * - userspace writes "0" (worked) or "-1" (failed) to /sys/$DEVPATH/loading
+ * - kernel loads firmware into device
+ */
+static void load_firmware(const char *firmware, const char *sysfs_path)
+{
+ int cnt;
+ int firmware_fd, loading_fd;
+
+ /* check for /lib/firmware/$FIRMWARE */
+ xchdir("/lib/firmware");
+ firmware_fd = open(firmware, O_RDONLY); /* can fail */
+
+ /* check for /sys/$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 >= 0)
+ goto loading;
+ sleep(1);
+ }
+ goto out;
+
+ loading:
+ 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"
+ * 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:
+ if (ENABLE_FEATURE_CLEAN_UP) {
+ close(firmware_fd);
+ close(loading_fd);
+ }
+}
+
+int mdev_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int mdev_main(int argc UNUSED_PARAM, char **argv)
+{
+ RESERVE_CONFIG_BUFFER(temp, PATH_MAX + SCRATCH_SIZE);
+
+ INIT_G();
+
+#if ENABLE_FEATURE_MDEV_CONF
+ G.filename = "/etc/mdev.conf";
+#endif
+
+ /* We can be called as hotplug helper */
+ /* Kernel cannot provide suitable stdio fds for us, do it ourself */
+ bb_sanitize_stdio();
+
+ /* Force the configuration file settings exactly */
+ umask(0);
+
+ xchdir("/dev");
+
+ if (argv[1] && strcmp(argv[1], "-s") == 0) {
+ /* Scan:
+ * mdev -s
+ */
+ struct stat st;
+
+#if ENABLE_FEATURE_MDEV_CONF
+ /* Same as xrealloc_vector(NULL, 4, 0): */
+ G.rule_vec = xzalloc((1 << 4) * sizeof(*G.rule_vec));
+#endif
+ xstat("/", &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);
+ } else {
+ char *fw;
+ char *seq;
+ char *action;
+ char *env_devname;
+ char *env_devpath;
+ smalluint op;
+
+ /* Hotplug:
+ * env ACTION=... DEVPATH=... SUBSYSTEM=... [SEQNUM=...] mdev
+ * ACTION can be "add" or "remove"
+ * DEVPATH is like "/block/sda" or "/class/input/mice"
+ */
+ action = getenv("ACTION");
+ op = index_in_strings(keywords, action);
+ env_devname = getenv("DEVNAME"); /* can be NULL */
+ env_devpath = getenv("DEVPATH");
+ G.subsystem = getenv("SUBSYSTEM");
+ if (!action || !env_devpath /*|| !G.subsystem*/)
+ bb_show_usage();
+ fw = getenv("FIRMWARE");
+ /* 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");
+ 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);
+ }
+
+ {
+ int logfd = open("/dev/mdev.log", O_WRONLY | O_APPEND);
+ if (logfd >= 0) {
+ xmove_fd(logfd, STDERR_FILENO);
+ G.verbose = 1;
+ bb_error_msg("seq: %s action: %s", seq, action);
+ }
+ }
+
+ 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(env_devname, temp, op);
+ }
+ else if (op == OP_add) {
+ make_device(env_devname, temp, op);
+ if (ENABLE_FEATURE_MDEV_LOAD_FIRMWARE) {
+ if (fw)
+ load_firmware(fw, temp);
+ }
+ }
+
+ if (seq) {
+ xopen_xwrite_close("mdev.seq", utoa(xatou(seq) + 1));
+ }
+ }
+
+ if (ENABLE_FEATURE_CLEAN_UP)
+ RELEASE_CONFIG_BUFFER(temp);
+
+ return EXIT_SUCCESS;
+}