From mboxrd@z Thu Jan  1 00:00:00 1970
From: Arnd Bergmann <arnd@arndb.de>
Date: Fri, 27 Feb 2004 13:02:06 +0000
Subject: hotplug for klibc utils
Message-Id: <200402271402.06890.arnd@arndb.de>
List-Id: <linux-hotplug.vger.kernel.org>
MIME-Version: 1.0
Content-Type: text/plain; charset="iso-8859-1"
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To: linux-hotplug@vger.kernel.org

Several people have run into problems when attaching large disk arrays to
a mainframe because of running /sbin/hotplug as a bash script takes far
longer than the interval between hotplug events.

Attaching more than 300 devices at once will cause an out-of-memory
condition and the kernel starts killing random processes.

Running only udev instead of hotplug from the kernel is fast enough.

Christian Borntr=E4ger was so kind to reimplement the Gregs hotplug=20
shell script in C and verify that this solves the problem.

The shell version currently does:
> DIR=3D"/etc/hotplug.d"
> for I in "${DIR}/$1/"*.hotplug "${DIR}/"default/*.hotplug ; do
>         if [ -f $I ]; then test -x $I && $I $1 ; fi
> done
> exit 1;

	Arnd <><

diff -urN klibc-0.115/utils/Makefile klibc-0.115-hotplug/utils/Makefile
--- klibc-0.115/utils/Makefile	2004-02-22 01:57:32.000000000 +0100
+++ klibc-0.115-hotplug/utils/Makefile	2004-02-27 11:00:40.000000000 +0100
@@ -6,7 +6,7 @@
 CFLAGS       =3D $(MAKEDEPS) $(OPTFLAGS) $(REQFLAGS) -W -Wall
 LIBS         =3D $(KLIBC) $(LIBGCC)
 PROGS       :=3D chroot dd fstype mkdir mkfifo mount pivot_root umount \
-	       true false sleep ln
+	       true false sleep ln hotplug
 STATICPROGS :=3D $(patsubst %,static/%,$(PROGS))
 SHAREDPROGS :=3D $(patsubst %,shared/%,$(PROGS))
 LIBOBJS	     =3D file_mode.o
diff -urN klibc-0.115/utils/hotplug.c klibc-0.115-hotplug/utils/hotplug.c
--- klibc-0.115/utils/hotplug.c	1970-01-01 01:00:00.000000000 +0100
+++ klibc-0.115-hotplug/utils/hotplug.c	2004-02-27 11:00:28.000000000 +0100
@@ -0,0 +1,80 @@
+/*
+ * Hotplug Multiplexer
+ * Author(s) Christian Borntraeger <cborntra@de.ibm.com>
+ */
+
+#include <dirent.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+#define HOTPLUGDIR "/etc/hotplug.d"
+#define SUFFIX ".hotplug"
+
+static inline void run_agent(char *name, char *parm)
+{
+	pid_t pid;
+
+	if (strlen(name) < sizeof (SUFFIX))
+		return;
+
+	if (strcmp(name + strlen(name) - sizeof (".hotplug") + 1, ".hotplug") !=
=3D 0)
+		return;
+
+	pid =3D fork();
+
+	if (pid < 0) {
+		perror("fork");
+		return;
+	}=20
+=09
+	if (pid > 0){
+		wait(NULL);
+		return;
+	}
+
+	execlp(name, name, parm, NULL);
+	exit(1);
+}
+
+/*
+ * enters the given directory and execute the *.hotplug files
+ */
+static void execute_dir (char *dirname, char *parm)
+{
+	DIR *directory;
+	struct dirent *entry;
+	char filename[256];
+
+	directory =3D opendir(dirname);
+	if (!directory)
+		return;
+
+	while ((entry =3D readdir(directory))) {
+		snprintf(filename, sizeof (filename),
+			 "%s%s", dirname, entry->d_name);
+		filename[sizeof (filename)-1] =3D '\0';
+		run_agent(filename, parm);
+	}
+
+	closedir(directory);
+}
+
+int main (int argc, char **argv)
+{
+	char dirname[256];
+
+	if (argc =3D 1)
+		return 0;
+
+	snprintf(dirname, sizeof (dirname), HOTPLUGDIR "/%s/", argv[1]);
+	dirname[sizeof (dirname)-1] =3D '\0';
+	execute_dir(dirname, argv[1]);
+
+	strcpy(dirname, HOTPLUGDIR "/default/");
+	execute_dir(dirname, argv[1]);
+	return 0;
+}



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