tif neither subsystem nor runpath is specified, process uevents based on compiled-in config - nldev - NetLink DEVice manager; a lightweight netlink frontend for mdev.
(HTM) git clone git://r-36.net/nldev
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---
(DIR) commit b9f67568d14c2dead805172f0d42ad6c9f98cdf2
(DIR) parent e0713f648e6bc486632c261e29d36c052c54f381
(HTM) Author: Platon Ryzhikov <ihummer63@yandex.ru>
Date: Sat, 11 Sep 2021 15:24:27 +0300
if neither subsystem nor runpath is specified, process uevents based on compiled-in config
Signed-off-by: Christoph Lohmann <20h@r-36.net>
Diffstat:
Makefile | 7 +++++--
config.def.h | 5 +++++
nldev.8 | 6 +++++-
nldev.c | 32 +++++++++++++++++++++++++++++--
4 files changed, 45 insertions(+), 5 deletions(-)
---
(DIR) diff --git a/Makefile b/Makefile
t@@ -18,7 +18,10 @@ options:
@echo CC $<
@${CC} -c ${CFLAGS} $<
-${OBJ}: config.mk
+${OBJ}: config.h config.mk
+
+config.h:
+ cp config.def.h $@
${NAME}: ${OBJ}
@echo CC -o $@
t@@ -31,7 +34,7 @@ clean:
dist: clean
@echo creating dist tarball
@mkdir -p ${NAME}-${VERSION}
- @cp -R LICENSE Makefile README.md FIXES.md config.mk \
+ @cp -R LICENSE Makefile README.md FIXES.md config.def.h config.mk \
${SRC} ${NAME}.8 *.h ${NAME}-${VERSION}
@tar -cf ${NAME}-${VERSION}.tar ${NAME}-${VERSION}
@gzip ${NAME}-${VERSION}.tar
(DIR) diff --git a/config.def.h b/config.def.h
t@@ -0,0 +1,5 @@
+static const Rule rules[] = {
+ /* ACTION SUBSYSTEM other env variables command to run */
+ { "add", NULL, "DEVNAME", "/bin/mdev" },
+ { "remove", NULL, "DEVNAME", "/bin/mdev" },
+};
(DIR) diff --git a/nldev.8 b/nldev.8
t@@ -42,7 +42,8 @@ Turn on debug messages. This will not work in conjunction with
.
.It Fl f Ar subsystem
This option will filter for the subsystem key in a netlink message
-and compare it to the subsystem string.
+and compare it to the subsystem string. On success runpath helper
+will be run.
.
.It Fl h
Show usage.
t@@ -58,6 +59,9 @@ Only show netlink messages from libudev.
This option specifies the runpath for the helper that is launched
on every received netlink event (default: /bin/mdev).
.El
+
+If neither subsystem nor runpath is specified, uevents are processed
+based on compiled-in config.
.
.Sh AUTHORS
See the LICENSE file for the authors of this software.
(DIR) diff --git a/nldev.c b/nldev.c
t@@ -21,7 +21,17 @@
#include <linux/types.h>
#include <linux/netlink.h>
+typedef struct {
+ const char *action; /* ACTION to run rule for */
+ const char *subsystem; /* SUBSYSTEM to run the rule for, NULL for any */
+ const char *envvar; /* other environment variable to run rule for, NULL for any */
+ const char *runpath;
+} Rule;
+
#include "arg.h"
+#include "config.h"
+
+#define LENGTH(X) (sizeof X / sizeof X[0])
char *argv0;
int listfd = -1;
t@@ -199,7 +209,7 @@ main(int argc, char *argv[])
showkernel = 1;
showudev = 1;
subsystem = NULL;
- runpath = "/bin/mdev";
+ runpath = NULL;
ARGBEGIN {
case 'b':
t@@ -210,6 +220,8 @@ main(int argc, char *argv[])
break;
case 'f':
subsystem = EARGF(usage());
+ if (!runpath)
+ runpath = "/bin/mdev";
break;
case 'k':
showudev = 0;
t@@ -324,7 +336,23 @@ main(int argc, char *argv[])
getenv("DEVPATH") != NULL &&
getenv("SUBSYSTEM") != NULL &&
getenv("SEQNUM") != NULL) {
- child(runpath);
+ if (runpath)
+ child(runpath);
+ else {
+ for (i = 0; i < LENGTH(rules); i+=1) {
+ if (rules[i].action == NULL || rules[i].runpath == NULL) /* rule must have non-NULL action and runpath */
+ continue;
+ if (strcmp(getenv("ACTION"), rules[i].action))
+ continue;
+ if (rules[i].subsystem != NULL)
+ if (strcmp(getenv("SUBSYSTEM"), rules[i].subsystem))
+ continue;
+ if (rules[i].envvar != NULL)
+ if (getenv(rules[i].envvar) == NULL)
+ continue;
+ child(rules[i].runpath);
+ }
+ }
}
}