1
0
mirror of https://github.com/systemd/systemd.git synced 2024-12-25 01:34:28 +03:00
systemd/dev_d.c
trini@kernel.crashing.org eb6c7cd036 [PATCH] Make udev/udevstart be one binary
Hi,

The following patch makes udev/udevstart be a common binary.  First,
doing this grows udev by a total of 1.8kB (ppc32, stripped) whereas
udevstart by itself is 6.4kB.  I know you mentioned being able to
replace udevstart with a script, but at 1.8kB I don't think it'll be
easy to beat this with size there.  Next, the following are by-eye
timings of before, after, and with devfs on a slow, but still usable
embedded platform (config stripped down to more-or-less bare for
ramdisk):
-- Embedded Planet RPX LITE, 64Mhz MPC 823e --
devfs         : 15.333s, 15.253s, 14.988s (15.191s avg)
udev-pristine : 18.675s, 18.079s, 18.418s (18.390s avg)
udev-multi    : 14.587s, 14.747s, 14.868s (14.734s avg)

The patch ends up being rather large to add this, as in doing so I ended
up making all refs (that I hit..) to devpath/subsystem be marked as
'const'.


Signed-off-by: Tom Rini <trini@kernel.crashing.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
2005-04-26 21:36:59 -07:00

114 lines
2.4 KiB
C

/*
* dev_d.c - dev.d/ multiplexer
*
* Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation version 2 of the License.
*/
/*
* This essentially emulates the following shell script logic in C:
* DIR="/etc/dev.d"
* export DEVNAME="whatever_dev_name_udev_just_gave"
* for I in "${DIR}/$DEVNAME/"*.dev "${DIR}/$1/"*.dev "${DIR}/default/"*.dev ; do
* if [ -f $I ]; then $I $1 ; fi
* done
* exit 1;
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include "udev.h"
#include "udev_lib.h"
#include "logging.h"
#define DEVD_DIR "/etc/dev.d/"
#define DEVD_SUFFIX ".dev"
static int run_program(char *name)
{
pid_t pid;
dbg("running %s", name);
pid = fork();
switch (pid) {
case 0:
/* child */
execv(name, main_argv);
dbg("exec of child failed");
exit(1);
case -1:
dbg("fork of child failed");
break;
return -1;
default:
wait(NULL);
}
return 0;
}
/*
* runs files in these directories in order:
* <node name given by udev>/
* subsystem/
* default/
*/
void dev_d_send(struct udevice *dev, const char *subsystem, const char *devpath)
{
char dirname[256];
char env_devname[NAME_SIZE];
char *devname;
char *temp;
if (udev_dev_d == 0)
return;
if (dev->type == 'b' || dev->type == 'c') {
strfieldcpy(env_devname, udev_root);
strfieldcat(env_devname, dev->name);
} else if (dev->type == 'n') {
strfieldcpy(env_devname, dev->name);
setenv("DEVPATH", devpath, 1);
}
setenv("DEVNAME", env_devname, 1);
dbg("DEVNAME='%s'", env_devname);
devname = strdup(dev->name);
if (!devname) {
dbg("out of memory");
return;
}
/* Chop the device name up into pieces based on '/' */
temp = strchr(devname, '/');
while (temp != NULL) {
*temp = 0x00;
strcpy(dirname, DEVD_DIR);
strfieldcat(dirname, devname);
call_foreach_file(run_program, dirname, DEVD_SUFFIX);
*temp = '/';
++temp;
temp = strchr(temp, '/');
}
strcpy(dirname, DEVD_DIR);
strfieldcat(dirname, dev->name);
call_foreach_file(run_program, dirname, DEVD_SUFFIX);
strcpy(dirname, DEVD_DIR);
strfieldcat(dirname, subsystem);
call_foreach_file(run_program, dirname, DEVD_SUFFIX);
strcpy(dirname, DEVD_DIR "default");
call_foreach_file(run_program, dirname, DEVD_SUFFIX);
}