mdev: add support for - "dont stop here" char
function old new delta make_device 1340 1362 +22 packed_usage 26291 26299 +8 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 2/0 up/down: 30/0) Total: 30 bytes
This commit is contained in:
Denis Vlasenko
parent
065c714791
commit
f2b39e088d
@ -2560,7 +2560,7 @@
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" echo /bin/mdev >/proc/sys/kernel/hotplug\n" \
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USE_FEATURE_MDEV_CONF( \
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"It uses /etc/mdev.conf with lines\n" \
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"DEVNAME UID:GID PERM" \
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"[-]DEVNAME UID:GID PERM" \
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USE_FEATURE_MDEV_RENAME(" [>|=PATH]") \
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USE_FEATURE_MDEV_EXEC(" [@|$|*COMMAND]") \
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) \
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@ -57,21 +57,12 @@ static char *build_alias(char *alias, const char *device_name)
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/* NB: "mdev -s" may call us many times, do not leak memory/fds! */
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static void make_device(char *path, int delete)
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{
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#if ENABLE_FEATURE_MDEV_CONF
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parser_t *parser;
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#endif
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const char *device_name;
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int major, minor, type, len;
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int mode = 0660;
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#if ENABLE_FEATURE_MDEV_CONF
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struct bb_uidgid_t ugid = { 0, 0 };
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parser_t *parser;
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char *tokens[5];
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# if ENABLE_FEATURE_MDEV_EXEC
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char *command = NULL;
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# endif
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# if ENABLE_FEATURE_MDEV_RENAME
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char *alias = NULL;
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char aliaslink = aliaslink; /* for compiler */
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# endif
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#endif
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int mode;
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char *dev_maj_min = path + strlen(path);
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/* Force the configuration file settings exactly. */
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@ -111,14 +102,37 @@ static void make_device(char *path, int delete)
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parser = config_open2("/etc/mdev.conf", fopen_for_read);
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/* If we have config file, look up user settings */
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while (config_read(parser, tokens, 4, 3, "# \t", PARSE_NORMAL)) {
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while (1) {
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regmatch_t off[1 + 9*ENABLE_FEATURE_MDEV_RENAME_REGEXP];
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char *val = tokens[0];
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int keep_matching;
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char *val;
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struct bb_uidgid_t ugid;
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char *tokens[4];
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# if ENABLE_FEATURE_MDEV_EXEC
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char *command = NULL;
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# endif
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# if ENABLE_FEATURE_MDEV_RENAME
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char *alias = NULL;
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char aliaslink = aliaslink; /* for compiler */
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# endif
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/* Defaults in case we won't match any line */
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ugid.uid = ugid.gid = 0;
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keep_matching = 0;
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mode = 0660;
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if (!config_read(parser, tokens, 4, 3, "# \t", PARSE_NORMAL)) {
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/* End of file, create dev node with default params */
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goto line_matches;
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}
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val = tokens[0];
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keep_matching = ('-' == val[0]);
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val += keep_matching; /* swallow leading dash */
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/* Fields: regex uid:gid mode [alias] [cmd] */
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/* 1st field: @<numeric maj,min>... */
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if (tokens[0][0] == '@') {
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if (val[0] == '@') {
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/* @major,minor[-last] */
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/* (useful when name is ambiguous:
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* "/sys/class/usb/lp0" and
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@ -126,12 +140,12 @@ static void make_device(char *path, int delete)
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int cmaj, cmin0, cmin1, sc;
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if (major < 0)
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continue; /* no dev, no match */
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sc = sscanf(tokens[0], "@%u,%u-%u", &cmaj, &cmin0, &cmin1);
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sc = sscanf(val, "@%u,%u-%u", &cmaj, &cmin0, &cmin1);
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if (sc < 1 || major != cmaj
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|| (sc == 2 && minor != cmin0)
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|| (sc == 3 && (minor < cmin0 || minor > cmin1))
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) {
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continue; /* no match */
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continue; /* this line doesn't match */
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}
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} else { /* ... or regex to match device name */
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regex_t match;
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@ -160,12 +174,12 @@ static void make_device(char *path, int delete)
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if (result || off[0].rm_so
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|| ((int)off[0].rm_eo != (int)strlen(dev_name_or_subsystem))
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) {
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continue;
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continue; /* this line doesn't match */
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}
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}
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/* This line matches: stop parsing the file
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* after parsing the rest of fields */
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/* This line matches: stop parsing the file after parsing
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* the rest of fields unless keep_matching == 1 */
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/* 2nd field: uid:gid - device ownership */
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parse_chown_usergroup_or_die(&ugid, tokens[1]);
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@ -174,24 +188,25 @@ static void make_device(char *path, int delete)
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mode = strtoul(tokens[2], NULL, 8);
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val = tokens[3];
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/* 4th field (opt): >alias */
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/* 4th field (opt): >|=alias */
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# if ENABLE_FEATURE_MDEV_RENAME
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if (!val)
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break;
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aliaslink = *val;
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goto line_matches;
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aliaslink = val[0];
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if (aliaslink == '>' || aliaslink == '=') {
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char *s, *st;
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char *a, *s, *st;
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# if ENABLE_FEATURE_MDEV_RENAME_REGEXP
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char *p;
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unsigned i, n;
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# endif
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char *a = val;
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a = val;
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s = strchrnul(val, ' ');
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st = strchrnul(val, '\t');
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if (st < s)
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s = st;
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val = (s[0] && s[1]) ? s+1 : NULL;
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s[0] = '\0';
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# if ENABLE_FEATURE_MDEV_RENAME_REGEXP
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/* substitute %1..9 with off[1..9], if any */
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n = 0;
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@ -223,12 +238,12 @@ static void make_device(char *path, int delete)
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# endif /* ENABLE_FEATURE_MDEV_RENAME */
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# if ENABLE_FEATURE_MDEV_EXEC
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/* The rest (opt): command to run */
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/* The rest (opt): @|$|*command */
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if (!val)
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break;
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goto line_matches;
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{
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const char *s = "@$*";
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const char *s2 = strchr(s, *val);
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const char *s2 = strchr(s, val[0]);
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if (!s2)
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bb_error_msg_and_die("bad line %u", parser->lineno);
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@ -244,71 +259,71 @@ static void make_device(char *path, int delete)
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}
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}
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# endif
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/* end of field parsing */
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break; /* we found matching line, stop */
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/* End of field parsing */
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line_matches:
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#endif /* ENABLE_FEATURE_MDEV_CONF */
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/* "Execute" the line we found */
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if (!delete && major >= 0) {
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if (ENABLE_FEATURE_MDEV_RENAME)
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unlink(device_name);
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if (mknod(device_name, mode | type, makedev(major, minor)) && errno != EEXIST)
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bb_perror_msg_and_die("mknod %s", device_name);
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if (major == root_major && minor == root_minor)
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symlink(device_name, "root");
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#if ENABLE_FEATURE_MDEV_CONF
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chown(device_name, ugid.uid, ugid.gid);
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# if ENABLE_FEATURE_MDEV_RENAME
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if (alias) {
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alias = build_alias(alias, device_name);
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/* move the device, and optionally
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* make a symlink to moved device node */
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if (rename(device_name, alias) == 0 && aliaslink == '>')
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symlink(alias, device_name);
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free(alias);
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}
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# endif
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#endif
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}
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#if ENABLE_FEATURE_MDEV_EXEC
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if (command) {
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/* setenv will leak memory, use putenv/unsetenv/free */
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char *s = xasprintf("%s=%s", "MDEV", device_name);
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char *s1 = xasprintf("%s=%s", "SUBSYSTEM", subsystem);
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putenv(s);
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putenv(s1);
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if (system(command) == -1)
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bb_perror_msg_and_die("can't run '%s'", command);
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unsetenv("SUBSYSTEM");
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free(s1);
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unsetenv("MDEV");
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free(s);
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free(command);
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}
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#endif
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if (delete) {
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unlink(device_name);
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/* At creation time, device might have been moved
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* and a symlink might have been created. Undo that. */
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#if ENABLE_FEATURE_MDEV_RENAME
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if (alias) {
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alias = build_alias(alias, device_name);
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unlink(alias);
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free(alias);
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}
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#endif
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}
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#if ENABLE_FEATURE_MDEV_CONF
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/* We found matching line.
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* Stop unless it was prefixed with '-' */
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if (!keep_matching)
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break;
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} /* end of "while line is read from /etc/mdev.conf" */
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config_close(parser);
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#endif /* ENABLE_FEATURE_MDEV_CONF */
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if (!delete && major >= 0) {
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if (ENABLE_FEATURE_MDEV_RENAME)
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unlink(device_name);
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if (mknod(device_name, mode | type, makedev(major, minor)) && errno != EEXIST)
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bb_perror_msg_and_die("mknod %s", device_name);
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if (major == root_major && minor == root_minor)
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symlink(device_name, "root");
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#if ENABLE_FEATURE_MDEV_CONF
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chown(device_name, ugid.uid, ugid.gid);
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# if ENABLE_FEATURE_MDEV_RENAME
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if (alias) {
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alias = build_alias(alias, device_name);
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/* move the device, and optionally
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* make a symlink to moved device node */
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if (rename(device_name, alias) == 0 && aliaslink == '>')
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symlink(alias, device_name);
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free(alias);
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}
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# endif
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#endif
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}
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#if ENABLE_FEATURE_MDEV_EXEC
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if (command) {
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/* setenv will leak memory, use putenv/unsetenv/free */
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char *s = xasprintf("%s=%s", "MDEV", device_name);
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char *s1 = xasprintf("%s=%s", "SUBSYSTEM", subsystem);
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putenv(s);
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putenv(s1);
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if (system(command) == -1)
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bb_perror_msg_and_die("can't run '%s'", command);
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unsetenv("SUBSYSTEM");
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free(s1);
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unsetenv("MDEV");
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free(s);
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free(command);
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}
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#endif
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if (delete) {
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unlink(device_name);
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/* At creation time, device might have been moved
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* and a symlink might have been created. Undo that. */
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#if ENABLE_FEATURE_MDEV_RENAME
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if (alias) {
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alias = build_alias(alias, device_name);
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unlink(alias);
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free(alias);
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}
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#endif
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}
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}
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/* File callback for /sys/ traversal */
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