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mdev: support for serializing hotplug

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function                                             old     new   delta
mdev_main                                            503     647    +144
This commit is contained in:
Denis Vlasenko
2008-07-15 22:33:13 +00:00
parent 97faf531c8
commit 018bee6afb
2 changed files with 51 additions and 3 deletions
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31
util-linux/mdev.c
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@ -374,8 +374,6 @@ static void load_firmware(const char *const firmware, const char *const sysfs_pa
int mdev_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int mdev_main(int argc UNUSED_PARAM, char **argv)
{
char *action;
char *env_path;
RESERVE_CONFIG_BUFFER(temp, PATH_MAX + SCRATCH_SIZE);
/* We can be called as hotplug helper */
@ -417,8 +415,14 @@ int mdev_main(int argc UNUSED_PARAM, char **argv)
ACTION_RECURSE | ACTION_FOLLOWLINKS,
fileAction, dirAction, temp, 0);
} else {
char *seq;
char *action;
char *env_path;
char seqbuf[sizeof(int)*3 + 2];
int seqlen = seqlen; /* for compiler */
/* Hotplug:
* env ACTION=... DEVPATH=... mdev
* env ACTION=... DEVPATH=... [SEQNUM=...] mdev
* ACTION can be "add" or "remove"
* DEVPATH is like "/block/sda" or "/class/input/mice"
*/
@ -427,6 +431,23 @@ int mdev_main(int argc UNUSED_PARAM, char **argv)
if (!action || !env_path)
bb_show_usage();
seq = getenv("SEQNUM");
if (seq) {
int timeout = 2000 / 32;
do {
seqlen = open_read_close("mdev.seq", seqbuf, sizeof(seqbuf-1));
if (seqlen < 0)
break;
seqbuf[seqlen] = '\0';
if (seqbuf[0] == '\n' /* seed file? */
|| strcmp(seq, seqbuf) == 0 /* correct idx? */
) {
break;
}
usleep(32*1000);
} while (--timeout);
}
snprintf(temp, PATH_MAX, "/sys%s", env_path);
if (!strcmp(action, "remove"))
make_device(temp, 1);
@ -439,6 +460,10 @@ int mdev_main(int argc UNUSED_PARAM, char **argv)
load_firmware(fw, temp);
}
}
if (seq && seqlen >= 0) {
xopen_xwrite_close("mdev.seq", utoa(xatou(seq) + 1));
}
}
if (ENABLE_FEATURE_CLEAN_UP)