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mdev: change subsystem syntax from /subsystem to subsystem/devname

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This commit is contained in:
Denis Vlasenko 2009-04-16 21:42:12 +00:00
parent ea4f0847c3
commit 6dda5dec23
1 changed files with 15 additions and 13 deletions
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28
util-linux/mdev.c
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@ -90,21 +90,24 @@ static void make_device(char *path, int delete)
device_name = bb_basename(path); device_name = bb_basename(path);
/* http://kernel.org/doc/pending/hotplug.txt says that only /* http://kernel.org/doc/pending/hotplug.txt says that only
* "/sys/block/..." is for block devices. "/sys/bus" etc is not. * "/sys/block/..." is for block devices. "/sys/bus" etc is not.
* But since 2.6.25 block devices are also in /sys/class/block. * 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; type = S_IFCHR;
if (strstr(path, "/block/")) if (strstr(path, "/block/"))
type = S_IFBLK; type = S_IFBLK;
/* Make path point to subsystem/device_name */
path += sizeof("/sys/class/") - 1;
#if !ENABLE_FEATURE_MDEV_CONF #if !ENABLE_FEATURE_MDEV_CONF
mode = 0660; mode = 0660;
#else #else
/* If we have config file, look up user settings */ /* If we have config file, look up user settings */
parser = config_open2("/etc/mdev.conf", fopen_for_read); parser = config_open2("/etc/mdev.conf", fopen_for_read);
while (1) { while (1) {
regmatch_t off[1 + 9*ENABLE_FEATURE_MDEV_RENAME_REGEXP]; regmatch_t off[1 + 9 * ENABLE_FEATURE_MDEV_RENAME_REGEXP];
int keep_matching; int keep_matching;
char *val; char *val, *name;
struct bb_uidgid_t ugid; struct bb_uidgid_t ugid;
char *tokens[4]; char *tokens[4];
# if ENABLE_FEATURE_MDEV_EXEC # if ENABLE_FEATURE_MDEV_EXEC
@ -128,6 +131,10 @@ static void make_device(char *path, int delete)
keep_matching = ('-' == val[0]); keep_matching = ('-' == val[0]);
val += keep_matching; /* swallow leading dash */ val += keep_matching; /* swallow leading dash */
/* Match against either subsystem/device_name
* or device_name alone */
name = strchr(val, '/') ? path : (char *) device_name;
/* Fields: regex uid:gid mode [alias] [cmd] */ /* Fields: regex uid:gid mode [alias] [cmd] */
/* 1st field: @<numeric maj,min>... */ /* 1st field: @<numeric maj,min>... */
@ -149,15 +156,10 @@ static void make_device(char *path, int delete)
} else { /* ... or regex to match device name */ } else { /* ... or regex to match device name */
regex_t match; regex_t match;
int result; int result;
const char *dev_name_or_subsystem = device_name;
if ('/' == val[0] && subsystem) {
dev_name_or_subsystem = subsystem;
val++;
}
/* Is this it? */ /* Is this it? */
xregcomp(&match, val, REG_EXTENDED); xregcomp(&match, val, REG_EXTENDED);
result = regexec(&match, dev_name_or_subsystem, ARRAY_SIZE(off), off, 0); result = regexec(&match, name, ARRAY_SIZE(off), off, 0);
regfree(&match); regfree(&match);
//bb_error_msg("matches:"); //bb_error_msg("matches:");
@ -171,7 +173,7 @@ static void make_device(char *path, int delete)
/* If not this device, skip rest of line */ /* If not this device, skip rest of line */
/* (regexec returns whole pattern as "range" 0) */ /* (regexec returns whole pattern as "range" 0) */
if (result || off[0].rm_so if (result || off[0].rm_so
|| ((int)off[0].rm_eo != (int)strlen(dev_name_or_subsystem)) || ((int)off[0].rm_eo != (int)strlen(name))
) { ) {
continue; /* this line doesn't match */ continue; /* this line doesn't match */
} }
@ -214,7 +216,7 @@ static void make_device(char *path, int delete)
if (*s++ == '%') if (*s++ == '%')
n++; n++;
p = alias = xzalloc(strlen(a) + n * strlen(device_name)); p = alias = xzalloc(strlen(a) + n * strlen(name));
s = a + 1; s = a + 1;
while (*s) { while (*s) {
*p = *s; *p = *s;
@ -222,7 +224,7 @@ static void make_device(char *path, int delete)
i = (s[1] - '0'); i = (s[1] - '0');
if (i <= 9 && off[i].rm_so >= 0) { if (i <= 9 && off[i].rm_so >= 0) {
n = off[i].rm_eo - off[i].rm_so; n = off[i].rm_eo - off[i].rm_so;
strncpy(p, device_name + off[i].rm_so, n); strncpy(p, name + off[i].rm_so, n);
p += n - 1; p += n - 1;
s++; s++;
} }