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mdev: provide $SUBSYSTEM (by Vladimir)

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function                                             old     new   delta
make_device                                         1265    1340     +75
dirAction                                             14      60     +46
mdev_main                                            676     695     +19
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 3/0 up/down: 140/0)             Total: 140 bytes
This commit is contained in:
Denis Vlasenko 2009-04-13 22:23:02 +00:00
parent 0b791d9a97
commit 065c714791
1 changed files with 26 additions and 7 deletions
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33
util-linux/mdev.c
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@ -14,10 +14,12 @@
struct globals {
int root_major, root_minor;
char *subsystem;
};
#define G (*(struct globals*)&bb_common_bufsiz1)
#define root_major (G.root_major)
#define root_minor (G.root_minor)
#define subsystem (G.subsystem)
/* Prevent infinite loops in /sys symlinks */
#define MAX_SYSFS_DEPTH 3
@ -111,7 +113,7 @@ static void make_device(char *path, int delete)
/* If we have config file, look up user settings */
while (config_read(parser, tokens, 4, 3, "# \t", PARSE_NORMAL)) {
regmatch_t off[1 + 9*ENABLE_FEATURE_MDEV_RENAME_REGEXP];
char *val;
char *val = tokens[0];
/* Fields: regex uid:gid mode [alias] [cmd] */
@ -134,10 +136,15 @@ static void make_device(char *path, int delete)
} else { /* ... or regex to match device name */
regex_t match;
int result;
const char *dev_name_or_subsystem = device_name;
if ('/' == val[0] && subsystem) {
dev_name_or_subsystem = subsystem;
val++;
}
/* Is this it? */
xregcomp(&match, tokens[0], REG_EXTENDED);
result = regexec(&match, device_name, ARRAY_SIZE(off), off, 0);
xregcomp(&match, val, REG_EXTENDED);
result = regexec(&match, dev_name_or_subsystem, ARRAY_SIZE(off), off, 0);
regfree(&match);
//bb_error_msg("matches:");
@ -151,7 +158,7 @@ static void make_device(char *path, int delete)
/* If not this device, skip rest of line */
/* (regexec returns whole pattern as "range" 0) */
if (result || off[0].rm_so
|| ((int)off[0].rm_eo != (int)strlen(device_name))
|| ((int)off[0].rm_eo != (int)strlen(dev_name_or_subsystem))
) {
continue;
}
@ -276,10 +283,14 @@ static void make_device(char *path, int delete)
#if ENABLE_FEATURE_MDEV_EXEC
if (command) {
/* setenv will leak memory, use putenv/unsetenv/free */
char *s = xasprintf("MDEV=%s", device_name);
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);
@ -326,6 +337,13 @@ static int FAST_FUNC dirAction(const char *fileName UNUSED_PARAM,
void *userData UNUSED_PARAM,
int depth)
{
/* Extract device subsystem -- the name of the directory under /sys/class/ */
if (1 == depth) {
subsystem = strrchr(fileName, '/');
if (subsystem)
subsystem++;
}
return (depth >= MAX_SYSFS_DEPTH ? SKIP : TRUE);
}
@ -445,13 +463,14 @@ int mdev_main(int argc UNUSED_PARAM, char **argv)
char *env_path;
/* Hotplug:
* env ACTION=... DEVPATH=... [SEQNUM=...] mdev
* env ACTION=... DEVPATH=... SUBSYSTEM=... [SEQNUM=...] mdev
* ACTION can be "add" or "remove"
* DEVPATH is like "/block/sda" or "/class/input/mice"
*/
action = getenv("ACTION");
env_path = getenv("DEVPATH");
if (!action || !env_path)
subsystem = getenv("SUBSYSTEM");
if (!action || !env_path /*|| !subsystem*/)
bb_show_usage();
fw = getenv("FIRMWARE");