From f2b39e088d6ccbf4a540c741059c2f661eebc9ac Mon Sep 17 00:00:00 2001 From: Denis Vlasenko Date: Mon, 13 Apr 2009 23:18:52 +0000 Subject: 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 --- util-linux/mdev.c | 179 +++++++++++++++++++++++++++++------------------------- 1 file changed, 97 insertions(+), 82 deletions(-) (limited to 'util-linux') diff --git a/util-linux/mdev.c b/util-linux/mdev.c index 3b0ef351e..b1f3d051c 100644 --- a/util-linux/mdev.c +++ b/util-linux/mdev.c @@ -57,21 +57,12 @@ static char *build_alias(char *alias, const char *device_name) /* NB: "mdev -s" may call us many times, do not leak memory/fds! */ static void make_device(char *path, int delete) { - const char *device_name; - int major, minor, type, len; - int mode = 0660; #if ENABLE_FEATURE_MDEV_CONF - struct bb_uidgid_t ugid = { 0, 0 }; parser_t *parser; - char *tokens[5]; -# if ENABLE_FEATURE_MDEV_EXEC - char *command = NULL; -# endif -# if ENABLE_FEATURE_MDEV_RENAME - char *alias = NULL; - char aliaslink = aliaslink; /* for compiler */ -# endif #endif + const char *device_name; + int major, minor, type, len; + int mode; char *dev_maj_min = path + strlen(path); /* Force the configuration file settings exactly. */ @@ -111,14 +102,37 @@ static void make_device(char *path, int delete) parser = config_open2("/etc/mdev.conf", fopen_for_read); /* If we have config file, look up user settings */ - while (config_read(parser, tokens, 4, 3, "# \t", PARSE_NORMAL)) { + while (1) { regmatch_t off[1 + 9*ENABLE_FEATURE_MDEV_RENAME_REGEXP]; - char *val = tokens[0]; + int keep_matching; + char *val; + struct bb_uidgid_t ugid; + char *tokens[4]; +# if ENABLE_FEATURE_MDEV_EXEC + char *command = NULL; +# endif +# if ENABLE_FEATURE_MDEV_RENAME + char *alias = NULL; + char aliaslink = aliaslink; /* for compiler */ +# endif + /* Defaults in case we won't match any line */ + ugid.uid = ugid.gid = 0; + keep_matching = 0; + mode = 0660; + + if (!config_read(parser, tokens, 4, 3, "# \t", PARSE_NORMAL)) { + /* End of file, create dev node with default params */ + goto line_matches; + } + + val = tokens[0]; + keep_matching = ('-' == val[0]); + val += keep_matching; /* swallow leading dash */ /* Fields: regex uid:gid mode [alias] [cmd] */ /* 1st field: @... */ - if (tokens[0][0] == '@') { + if (val[0] == '@') { /* @major,minor[-last] */ /* (useful when name is ambiguous: * "/sys/class/usb/lp0" and @@ -126,12 +140,12 @@ static void make_device(char *path, int delete) int cmaj, cmin0, cmin1, sc; if (major < 0) continue; /* no dev, no match */ - sc = sscanf(tokens[0], "@%u,%u-%u", &cmaj, &cmin0, &cmin1); + sc = sscanf(val, "@%u,%u-%u", &cmaj, &cmin0, &cmin1); if (sc < 1 || major != cmaj || (sc == 2 && minor != cmin0) || (sc == 3 && (minor < cmin0 || minor > cmin1)) ) { - continue; /* no match */ + continue; /* this line doesn't match */ } } else { /* ... or regex to match device name */ regex_t match; @@ -160,12 +174,12 @@ static void make_device(char *path, int delete) if (result || off[0].rm_so || ((int)off[0].rm_eo != (int)strlen(dev_name_or_subsystem)) ) { - continue; + continue; /* this line doesn't match */ } } - /* This line matches: stop parsing the file - * after parsing the rest of fields */ + /* This line matches: stop parsing the file after parsing + * the rest of fields unless keep_matching == 1 */ /* 2nd field: uid:gid - device ownership */ parse_chown_usergroup_or_die(&ugid, tokens[1]); @@ -174,24 +188,25 @@ static void make_device(char *path, int delete) mode = strtoul(tokens[2], NULL, 8); val = tokens[3]; - /* 4th field (opt): >alias */ + /* 4th field (opt): >|=alias */ # if ENABLE_FEATURE_MDEV_RENAME if (!val) - break; - aliaslink = *val; + goto line_matches; + aliaslink = val[0]; if (aliaslink == '>' || aliaslink == '=') { - char *s, *st; + char *a, *s, *st; # if ENABLE_FEATURE_MDEV_RENAME_REGEXP char *p; unsigned i, n; # endif - char *a = val; + a = val; s = strchrnul(val, ' '); st = strchrnul(val, '\t'); if (st < s) s = st; val = (s[0] && s[1]) ? s+1 : NULL; s[0] = '\0'; + # if ENABLE_FEATURE_MDEV_RENAME_REGEXP /* substitute %1..9 with off[1..9], if any */ n = 0; @@ -223,12 +238,12 @@ static void make_device(char *path, int delete) # endif /* ENABLE_FEATURE_MDEV_RENAME */ # if ENABLE_FEATURE_MDEV_EXEC - /* The rest (opt): command to run */ + /* The rest (opt): @|$|*command */ if (!val) - break; + goto line_matches; { const char *s = "@$*"; - const char *s2 = strchr(s, *val); + const char *s2 = strchr(s, val[0]); if (!s2) bb_error_msg_and_die("bad line %u", parser->lineno); @@ -244,71 +259,71 @@ static void make_device(char *path, int delete) } } # endif - /* end of field parsing */ - break; /* we found matching line, stop */ - } /* end of "while line is read from /etc/mdev.conf" */ - - config_close(parser); + /* End of field parsing */ + line_matches: #endif /* ENABLE_FEATURE_MDEV_CONF */ - if (!delete && major >= 0) { - - if (ENABLE_FEATURE_MDEV_RENAME) - unlink(device_name); - - if (mknod(device_name, mode | type, makedev(major, minor)) && errno != EEXIST) - bb_perror_msg_and_die("mknod %s", device_name); - - if (major == root_major && minor == root_minor) - symlink(device_name, "root"); + /* "Execute" the line we found */ + if (!delete && major >= 0) { + if (ENABLE_FEATURE_MDEV_RENAME) + unlink(device_name); + if (mknod(device_name, mode | type, makedev(major, minor)) && errno != EEXIST) + bb_perror_msg_and_die("mknod %s", device_name); + if (major == root_major && minor == root_minor) + symlink(device_name, "root"); #if ENABLE_FEATURE_MDEV_CONF - chown(device_name, ugid.uid, ugid.gid); - + chown(device_name, ugid.uid, ugid.gid); # if ENABLE_FEATURE_MDEV_RENAME - if (alias) { - alias = build_alias(alias, device_name); - - /* move the device, and optionally - * make a symlink to moved device node */ - if (rename(device_name, alias) == 0 && aliaslink == '>') - symlink(alias, device_name); - - free(alias); - } + if (alias) { + alias = build_alias(alias, device_name); + /* move the device, and optionally + * make a symlink to moved device node */ + if (rename(device_name, alias) == 0 && aliaslink == '>') + symlink(alias, device_name); + free(alias); + } # endif #endif - } - + } #if ENABLE_FEATURE_MDEV_EXEC - if (command) { - /* setenv will leak memory, use putenv/unsetenv/free */ - char *s = xasprintf("%s=%s", "MDEV", device_name); - char *s1 = xasprintf("%s=%s", "SUBSYSTEM", subsystem); - putenv(s); - putenv(s1); - if (system(command) == -1) - bb_perror_msg_and_die("can't run '%s'", command); - unsetenv("SUBSYSTEM"); - free(s1); - unsetenv("MDEV"); - free(s); - free(command); - } + if (command) { + /* setenv will leak memory, use putenv/unsetenv/free */ + char *s = xasprintf("%s=%s", "MDEV", device_name); + char *s1 = xasprintf("%s=%s", "SUBSYSTEM", subsystem); + putenv(s); + putenv(s1); + if (system(command) == -1) + bb_perror_msg_and_die("can't run '%s'", command); + unsetenv("SUBSYSTEM"); + free(s1); + unsetenv("MDEV"); + free(s); + free(command); + } #endif - - if (delete) { - unlink(device_name); - /* At creation time, device might have been moved - * and a symlink might have been created. Undo that. */ + if (delete) { + unlink(device_name); + /* At creation time, device might have been moved + * and a symlink might have been created. Undo that. */ #if ENABLE_FEATURE_MDEV_RENAME - if (alias) { - alias = build_alias(alias, device_name); - unlink(alias); - free(alias); - } + if (alias) { + alias = build_alias(alias, device_name); + unlink(alias); + free(alias); + } #endif - } + } + +#if ENABLE_FEATURE_MDEV_CONF + /* We found matching line. + * Stop unless it was prefixed with '-' */ + if (!keep_matching) + break; + } /* end of "while line is read from /etc/mdev.conf" */ + + config_close(parser); +#endif /* ENABLE_FEATURE_MDEV_CONF */ } /* File callback for /sys/ traversal */ -- cgit v1.2.3