[thirdparty/systemd.git] / wait_for_sysfs.c

/*
 * wait_for_sysfs.c  - small program to delay the execution
 *		       of /etc/hotplug.d/ programs, until sysfs
 *		       is fully populated by the kernel. Depending on
 *		       the type of device, we wait for all expected
 *		       directories and then just exit.
 *
 * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
 *
 *	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 program is distributed in the hope that it will be useful, but
 *	WITHOUT ANY WARRANTY; without even the implied warranty of
 *	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *	General Public License for more details.
 * 
 *	You should have received a copy of the GNU General Public License along
 *	with this program; if not, write to the Free Software Foundation, Inc.,
 *	675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

#include <stdio.h>
#include <stddef.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <sys/stat.h>

#include "logging.h"
#include "udev_version.h"
#include "libsysfs/sysfs/libsysfs.h"

#ifdef LOG
unsigned char logname[LOGNAME_SIZE];
void log_message(int level, const char *format, ...)
{
	va_list args;

	va_start(args, format);
	vsyslog(level, format, args);
	va_end(args);
}
#endif

#define WAIT_MAX_SECONDS		10
#define WAIT_LOOP_PER_SECOND		20

/* wait for specific file to show up, normally the "dev"-file */
static int wait_for_class_device_attributes(struct sysfs_class_device *class_dev)
{
	static struct class_file {
		char *subsystem;
		char *file;
	} class_files[] = {
		{ .subsystem = "net",		.file = "ifindex" },
		{ .subsystem = "scsi_host",	.file = "unique_id" },
		{ .subsystem = "scsi_device",	.file = NULL },
		{ .subsystem = "pcmcia_socket",	.file = NULL }, /* all files are unreadable in empty slot :( */
		{ .subsystem = "usb_host",	.file = NULL },
		{ .subsystem = "bluetooth",	.file = "address" },
		{ .subsystem = "firmware",	.file = "data" },
		{ .subsystem = "i2c-adapter",	.file = NULL },
		{ .subsystem = "pci_bus",	.file = NULL },
		{ .subsystem = "ieee1394",	.file = NULL },
		{ .subsystem = "ieee1394_host",	.file = NULL },
		{ .subsystem = "ieee1394_node",	.file = NULL },
		{ NULL, NULL }
	};
	struct class_file *classfile;
	const char *file = "dev";
	int loop;

	/* look if we want to look for another file instead of "dev" */
	for (classfile = class_files; classfile->subsystem != NULL; classfile++) {
		if (strcmp(class_dev->classname, classfile->subsystem) == 0) {
			if (classfile->file == NULL) {
				dbg("class '%s' has no file to wait for", class_dev->classname);
				return 0;
			}
			file = classfile->file;
			break;
		}
	}
	dbg("looking at class '%s' for specific file '%s'", class_dev->classname, file);

	loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
	while (--loop) {
		if (sysfs_get_classdev_attr(class_dev, file) != NULL) {
			dbg("class '%s' specific file '%s' found", class_dev->classname, file);
			return 0;
		}

		usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
	}

	dbg("error: getting class '%s' specific file '%s'", class_dev->classname, file);
	return -1;
}

/* check if we need to wait for a physical device */
static int class_device_expect_no_device_link(struct sysfs_class_device *class_dev)
{
	/* list of devices without a "device" symlink to the physical device
	 * if device is set to NULL, no devices in that subsystem has a link */
	static struct class_device {
		char *subsystem;
		char *device;
	} class_device[] = {
		{ .subsystem = "block",		.device = "double" },
		{ .subsystem = "block",		.device = "nb" },
		{ .subsystem = "block",		.device = "ram" },
		{ .subsystem = "block",		.device = "loop" },
		{ .subsystem = "block",		.device = "fd" },
		{ .subsystem = "block",		.device = "md" },
		{ .subsystem = "block",		.device = "dos_cd" },
		{ .subsystem = "block",		.device = "rflash" },
		{ .subsystem = "block",		.device = "rom" },
		{ .subsystem = "block",		.device = "rrom" },
		{ .subsystem = "block",		.device = "flash" },
		{ .subsystem = "block",		.device = "msd" },
		{ .subsystem = "block",		.device = "sbpcd" },
		{ .subsystem = "block",		.device = "pcd" },
		{ .subsystem = "block",		.device = "pf" },
		{ .subsystem = "block",		.device = "scd" },
		{ .subsystem = "block",		.device = "ubd" },
		{ .subsystem = "input",		.device = "event" },
		{ .subsystem = "input",		.device = "mice" },
		{ .subsystem = "input",		.device = "mouse" },
		{ .subsystem = "input",		.device = "ts" },
		{ .subsystem = "vc",		.device = NULL },
		{ .subsystem = "tty",		.device = NULL },
		{ .subsystem = "cpuid",		.device = "cpu" },
		{ .subsystem = "graphics",	.device = "fb" },
		{ .subsystem = "mem",		.device = NULL },
		{ .subsystem = "misc",		.device = NULL },
		{ .subsystem = "msr",		.device = NULL },
		{ .subsystem = "netlink",	.device = NULL },
		{ .subsystem = "net",		.device = "sit" },
		{ .subsystem = "net",		.device = "ppp" },
		{ .subsystem = "net",		.device = "lo" },
		{ .subsystem = "net",		.device = "tap" },
		{ .subsystem = "net",		.device = "ipsec" },
		{ .subsystem = "net",		.device = "irda" },
		{ .subsystem = "sound",		.device = NULL },
		{ .subsystem = "printer",	.device = "lp" },
		{ .subsystem = "nvidia",	.device = NULL },
		{ .subsystem = "video4linux",	.device = "vbi" },
		{ .subsystem = "lirc",		.device = NULL },
		{ .subsystem = "firmware",	.device = NULL },
		{ .subsystem = "drm",		.device = NULL },
		{ .subsystem = "pci_bus",	.device = NULL },
		{ .subsystem = "ieee1394",	.device = NULL },
		{ .subsystem = "ieee1394_host",	.device = NULL },
		{ .subsystem = "ieee1394_node",	.device = NULL },
		{ .subsystem = "raw",		.device = NULL },
		{ NULL, NULL }
	};
	struct class_device *classdevice;
	int len;

	for (classdevice = class_device; classdevice->subsystem != NULL; classdevice++) {
		if (strcmp(class_dev->classname, classdevice->subsystem) == 0) {
			/* see if no device in this class is expected to have a device-link */
			if (classdevice->device == NULL)
				return 1;

			len = strlen(classdevice->device);

			/* see if device name matches */
			if (strncmp(class_dev->name, classdevice->device, len) != 0)
				continue;

			/* exact name match */
			if (strlen(class_dev->name) == len)
				return 1;

			/* name match with instance number */
			if (isdigit(class_dev->name[len]))
				return 1;
		}
	}

	return 0;
}

/* skip waiting for the bus */
static int class_device_expect_no_bus(struct sysfs_class_device *class_dev)
{
	static char *devices_without_bus[] = {
		"scsi_host",
		"i2c-adapter",
		NULL
	};
	char **device;

	for (device = devices_without_bus; *device != NULL; device++) {
		int len = strlen(*device);

		if (strncmp(class_dev->classname, *device, len) == 0)
			return 1;
	}

	return 0;
}

/* wait for the bus and for a bus specific file to show up */
static int wait_for_bus_device(struct sysfs_device *device_dev)
{
	static struct bus_file {
		char *bus;
		char *file;
	} bus_files[] = {
		{ .bus = "scsi",	.file = "vendor" },
		{ .bus = "usb",		.file = "idVendor" },
		{ .bus = "usb",		.file = "iInterface" },
		{ .bus = "usb",		.file = "bNumEndpoints" },
		{ .bus = "usb-serial",	.file = "detach_state" },
		{ .bus = "ide",		.file = "detach_state" },
		{ .bus = "pci",		.file = "vendor" },
		{ .bus = "platform",	.file = "detach_state" },
		{ .bus = "i2c",		.file = "detach_state" },
		{ NULL }
	};
	struct bus_file *busfile;
	int loop;

	/* wait for the /bus-device link to the /device-device */
	loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
	while (--loop) {
		if (sysfs_get_device_bus(device_dev) == 0)
			break;

		usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
	}
	if (loop == 0) {
		dbg("error: getting /bus-device link");
		return -1;
	}
	dbg("/bus-device link found for bus '%s'", device_dev->bus);

	/* wait for a bus specific file to show up */
	loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
	while (--loop) {
		int found = 0;

		for (busfile = bus_files; busfile->bus != NULL; busfile++) {
			if (strcmp(device_dev->bus, busfile->bus) == 0) {
				found = 1;
				dbg("looking at bus '%s' for specific file '%s'", device_dev->bus, busfile->file);
				if (sysfs_get_device_attr(device_dev, busfile->file) != NULL) {
					dbg("bus '%s' specific file '%s' found", device_dev->bus, busfile->file);
					return 0;
				}
			}
		}
		if (found == 0) {
			info("error: unknown bus, please report to "
			     "<linux-hotplug-devel@lists.sourceforge.net> '%s'", device_dev->bus);
			return -1;
		}
		usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
	}

	dbg("error: getting bus '%s' specific file '%s'", device_dev->bus, busfile->file);
	return -1;
}

int main(int argc, char *argv[], char *envp[])
{
	const char *devpath = "";
	const char *action;
	const char *subsystem;
	char sysfs_path[SYSFS_PATH_MAX];
	char filename[SYSFS_PATH_MAX];
	struct sysfs_class_device *class_dev;
	struct sysfs_class_device *class_dev_parent;
	struct sysfs_device *device_dev = NULL;
	int loop;
	int rc = 0;

	init_logging("wait_for_sysfs");

	if (argc != 2) {
		dbg("error: subsystem");
		return 1;
	}
	subsystem = argv[1];

	devpath = getenv ("DEVPATH");
	if (!devpath) {
		dbg("error: no DEVPATH");
		return 1;
	}

	action = getenv ("ACTION");
	if (!action) {
		dbg("error: no ACTION");
		return 1;
	}

	/* we only wait on an add event */
	if (strcmp(action, "add") != 0)
		return 0;

	if (sysfs_get_mnt_path(sysfs_path, SYSFS_PATH_MAX) != 0) {
		dbg("error: no sysfs path");
		return 2;
	}

	if ((strncmp(devpath, "/block/", 7) == 0) || (strncmp(devpath, "/class/", 7) == 0)) {
		/* open the class device we are called for */
		snprintf(filename, SYSFS_PATH_MAX-1, "%s%s", sysfs_path, devpath);
		filename[SYSFS_PATH_MAX-1] = '\0';

		loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
		while (--loop) {
			class_dev = sysfs_open_class_device_path(filename);
			if (class_dev)
				break;

			usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
		}
		if (class_dev == NULL) {
			dbg("error: getting class_device");
			rc = 3;
			goto exit;
		}
		dbg("class_device opened '%s'", filename);

		if (wait_for_class_device_attributes(class_dev) != 0) {
			rc = 4;
			goto exit_class;
		}

		/* skip devices without /device-link */
		if (class_device_expect_no_device_link(class_dev)) {
			dbg("no device symlink expected for '%s', ", class_dev->name);
			goto exit_class;
		}

		/* the symlink may be on the parent device */
		class_dev_parent = sysfs_get_classdev_parent(class_dev);
		if (class_dev_parent)
			dbg("looking at parent device for device link '%s'", class_dev_parent->path);

		/* wait for the symlink to the /device-device */
		dbg("waiting for symlink to /device-device");
		loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
		while (--loop) {
			if (class_dev_parent)
				device_dev = sysfs_get_classdev_device(class_dev_parent);
			else
				device_dev = sysfs_get_classdev_device(class_dev);

			if (device_dev)
				break;

			usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
		}
		if (device_dev == NULL) {
			dbg("error: getting /device-device");
			rc = 5;
			goto exit_class;
		}
		dbg("device symlink found pointing to '%s'", device_dev->path);

		/* wait for the bus value */
		if (class_device_expect_no_bus(class_dev)) {
			dbg("no bus device expected for '%s', ", class_dev->classname);
		} else {
			if (wait_for_bus_device(device_dev) != 0)
				rc = 6;
		}

exit_class:
		sysfs_close_class_device(class_dev);

	} else if ((strncmp(devpath, "/devices/", 9) == 0)) {
		/* open the path we are called for */
		snprintf(filename, SYSFS_PATH_MAX-1, "%s%s", sysfs_path, devpath);
		filename[SYSFS_PATH_MAX-1] = '\0';

		loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
		while (--loop) {
			device_dev = sysfs_open_device_path(filename);
			if (device_dev)
				break;

			usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
		}
		if (device_dev == NULL) {
			dbg("error: getting /device-device");
			rc = 7;
			goto exit;
		}
		dbg("device_device opened '%s'", filename);

		/* wait for the bus value */
		if (wait_for_bus_device(device_dev) != 0)
			rc = 8;

		sysfs_close_device(device_dev);

	} else {
		dbg("unhandled sysfs path, no need to wait");
	}

exit:
	if (rc == 0)
		dbg("result: waiting for sysfs successful '%s'", devpath);
	else
		info("either wait_for_sysfs (udev %s) needs an update to handle the device '%s' "
		     "properly (%d) or the sysfs-support of your device's driver needs to be fixed, "
		     "please report to <linux-hotplug-devel@lists.sourceforge.net>",
		     UDEV_VERSION, devpath, rc);

	return rc;
}
Commit	Line	Data
a8b5267a KS	1	/*
	2	* wait_for_sysfs.c - small program to delay the execution
	3	* of /etc/hotplug.d/ programs, until sysfs
e629ca3f	4	* is fully populated by the kernel. Depending on
a8b5267a KS	5	* the type of device, we wait for all expected
	6	* directories and then just exit.
	7	*
	8	* Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
	9	*
	10	* This program is free software; you can redistribute it and/or modify it
	11	* under the terms of the GNU General Public License as published by the
	12	* Free Software Foundation version 2 of the License.
	13	*
	14	* This program is distributed in the hope that it will be useful, but
	15	* WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	17	* General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU General Public License along
	20	* with this program; if not, write to the Free Software Foundation, Inc.,
	21	* 675 Mass Ave, Cambridge, MA 02139, USA.
	22	*
	23	*/
	24
	25	#include <stdio.h>
	26	#include <stddef.h>
	27	#include <stdlib.h>
	28	#include <unistd.h>
	29	#include <string.h>
	30	#include <ctype.h>
	31	#include <errno.h>
	32	#include <sys/stat.h>
	33
	34	#include "logging.h"
cdd95f9a	35	#include "udev_version.h"
a8b5267a KS	36	#include "libsysfs/sysfs/libsysfs.h"
	37
	38	#ifdef LOG
	39	unsigned char logname[LOGNAME_SIZE];
	40	void log_message(int level, const char *format, ...)
	41	{
	42	va_list args;
	43
	44	va_start(args, format);
	45	vsyslog(level, format, args);
	46	va_end(args);
	47	}
	48	#endif
	49
fa7aa5ec	50	#define WAIT_MAX_SECONDS 10
a8b5267a KS	51	#define WAIT_LOOP_PER_SECOND 20
a8b5267a KS	52
e629ca3f	53	/* wait for specific file to show up, normally the "dev"-file */
a8b5267a KS	54	static int wait_for_class_device_attributes(struct sysfs_class_device *class_dev)
	55	{
	56	static struct class_file {
	57	char *subsystem;
	58	char *file;
	59	} class_files[] = {
	60	{ .subsystem = "net", .file = "ifindex" },
e629ca3f KS	61	{ .subsystem = "scsi_host", .file = "unique_id" },
e629ca3f KS	62	{ .subsystem = "scsi_device", .file = NULL },
a75910b4	63	{ .subsystem = "pcmcia_socket", .file = NULL }, /* all files are unreadable in empty slot :( */
a8b5267a	64	{ .subsystem = "usb_host", .file = NULL },
90852564	65	{ .subsystem = "bluetooth", .file = "address" },
139087e8	66	{ .subsystem = "firmware", .file = "data" },
1a13fcb3	67	{ .subsystem = "i2c-adapter", .file = NULL },
10eb67ec	68	{ .subsystem = "pci_bus", .file = NULL },
83729077 GKH	69	{ .subsystem = "ieee1394", .file = NULL },
	70	{ .subsystem = "ieee1394_host", .file = NULL },
	71	{ .subsystem = "ieee1394_node", .file = NULL },
a8b5267a KS	72	{ NULL, NULL }
	73	};
	74	struct class_file *classfile;
	75	const char *file = "dev";
	76	int loop;
	77
	78	/* look if we want to look for another file instead of "dev" */
	79	for (classfile = class_files; classfile->subsystem != NULL; classfile++) {
	80	if (strcmp(class_dev->classname, classfile->subsystem) == 0) {
	81	if (classfile->file == NULL) {
	82	dbg("class '%s' has no file to wait for", class_dev->classname);
	83	return 0;
	84	}
	85	file = classfile->file;
	86	break;
	87	}
	88	}
	89	dbg("looking at class '%s' for specific file '%s'", class_dev->classname, file);
	90
	91	loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
	92	while (--loop) {
	93	if (sysfs_get_classdev_attr(class_dev, file) != NULL) {
	94	dbg("class '%s' specific file '%s' found", class_dev->classname, file);
	95	return 0;
	96	}
e629ca3f KS	97
e629ca3f KS	98	usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
a8b5267a KS	99	}
a8b5267a KS	100
e629ca3f	101	dbg("error: getting class '%s' specific file '%s'", class_dev->classname, file);
a8b5267a KS	102	return -1;
	103	}
	104
7e89a569	105	/* check if we need to wait for a physical device */
a8b5267a KS	106	static int class_device_expect_no_device_link(struct sysfs_class_device *class_dev)
a8b5267a KS	107	{
7e89a569 KS	108	/* list of devices without a "device" symlink to the physical device
7e89a569 KS	109	* if device is set to NULL, no devices in that subsystem has a link */
b9b659ae GKH	110	static struct class_device {
	111	char *subsystem;
	112	char *device;
	113	} class_device[] = {
	114	{ .subsystem = "block", .device = "double" },
	115	{ .subsystem = "block", .device = "nb" },
	116	{ .subsystem = "block", .device = "ram" },
	117	{ .subsystem = "block", .device = "loop" },
	118	{ .subsystem = "block", .device = "fd" },
	119	{ .subsystem = "block", .device = "md" },
	120	{ .subsystem = "block", .device = "dos_cd" },
	121	{ .subsystem = "block", .device = "rflash" },
	122	{ .subsystem = "block", .device = "rom" },
	123	{ .subsystem = "block", .device = "rrom" },
	124	{ .subsystem = "block", .device = "flash" },
	125	{ .subsystem = "block", .device = "msd" },
	126	{ .subsystem = "block", .device = "sbpcd" },
	127	{ .subsystem = "block", .device = "pcd" },
	128	{ .subsystem = "block", .device = "pf" },
	129	{ .subsystem = "block", .device = "scd" },
	130	{ .subsystem = "block", .device = "ubd" },
	131	{ .subsystem = "input", .device = "event" },
	132	{ .subsystem = "input", .device = "mice" },
	133	{ .subsystem = "input", .device = "mouse" },
	134	{ .subsystem = "input", .device = "ts" },
10eb67ec	135	{ .subsystem = "vc", .device = NULL },
b9b659ae GKH	136	{ .subsystem = "tty", .device = NULL },
	137	{ .subsystem = "cpuid", .device = "cpu" },
	138	{ .subsystem = "graphics", .device = "fb" },
	139	{ .subsystem = "mem", .device = NULL },
	140	{ .subsystem = "misc", .device = NULL },
	141	{ .subsystem = "msr", .device = NULL },
	142	{ .subsystem = "netlink", .device = NULL },
cdd95f9a KS	143	{ .subsystem = "net", .device = "sit" },
	144	{ .subsystem = "net", .device = "ppp" },
	145	{ .subsystem = "net", .device = "lo" },
	146	{ .subsystem = "net", .device = "tap" },
d38c486a	147	{ .subsystem = "net", .device = "ipsec" },
139087e8	148	{ .subsystem = "net", .device = "irda" },
b9b659ae	149	{ .subsystem = "sound", .device = NULL },
b9b659ae	150	{ .subsystem = "printer", .device = "lp" },
10eb67ec	151	{ .subsystem = "nvidia", .device = NULL },
cdd95f9a	152	{ .subsystem = "video4linux", .device = "vbi" },
10eb67ec GKH	153	{ .subsystem = "lirc", .device = NULL },
	154	{ .subsystem = "firmware", .device = NULL },
	155	{ .subsystem = "drm", .device = NULL },
	156	{ .subsystem = "pci_bus", .device = NULL },
83729077 GKH	157	{ .subsystem = "ieee1394", .device = NULL },
	158	{ .subsystem = "ieee1394_host", .device = NULL },
	159	{ .subsystem = "ieee1394_node", .device = NULL },
2b29bb4f	160	{ .subsystem = "raw", .device = NULL },
b9b659ae	161	{ NULL, NULL }
a8b5267a	162	};
b9b659ae GKH	163	struct class_device *classdevice;
b9b659ae GKH	164	int len;
a8b5267a	165
b9b659ae GKH	166	for (classdevice = class_device; classdevice->subsystem != NULL; classdevice++) {
b9b659ae GKH	167	if (strcmp(class_dev->classname, classdevice->subsystem) == 0) {
7e89a569	168	/* see if no device in this class is expected to have a device-link */
b9b659ae GKH	169	if (classdevice->device == NULL)
b9b659ae GKH	170	return 1;
a8b5267a	171
b9b659ae	172	len = strlen(classdevice->device);
a8b5267a	173
b9b659ae GKH	174	/* see if device name matches */
	175	if (strncmp(class_dev->name, classdevice->device, len) != 0)
	176	continue;
a8b5267a	177
7e89a569	178	/* exact name match */
b9b659ae GKH	179	if (strlen(class_dev->name) == len)
	180	return 1;
	181
7e89a569	182	/* name match with instance number */
b9b659ae GKH	183	if (isdigit(class_dev->name[len]))
	184	return 1;
	185	}
a8b5267a KS	186	}
	187
	188	return 0;
	189	}
	190
e629ca3f KS	191	/* skip waiting for the bus */
	192	static int class_device_expect_no_bus(struct sysfs_class_device *class_dev)
	193	{
	194	static char *devices_without_bus[] = {
	195	"scsi_host",
1a13fcb3	196	"i2c-adapter",
e629ca3f KS	197	NULL
	198	};
	199	char **device;
	200
	201	for (device = devices_without_bus; *device != NULL; device++) {
	202	int len = strlen(*device);
	203
	204	if (strncmp(class_dev->classname, *device, len) == 0)
	205	return 1;
	206	}
	207
	208	return 0;
	209	}
	210
	211	/* wait for the bus and for a bus specific file to show up */
a8b5267a KS	212	static int wait_for_bus_device(struct sysfs_device *device_dev)
	213	{
	214	static struct bus_file {
	215	char *bus;
	216	char *file;
	217	} bus_files[] = {
	218	{ .bus = "scsi", .file = "vendor" },
	219	{ .bus = "usb", .file = "idVendor" },
	220	{ .bus = "usb", .file = "iInterface" },
e284ecba	221	{ .bus = "usb", .file = "bNumEndpoints" },
a8b5267a KS	222	{ .bus = "usb-serial", .file = "detach_state" },
	223	{ .bus = "ide", .file = "detach_state" },
	224	{ .bus = "pci", .file = "vendor" },
e629ca3f	225	{ .bus = "platform", .file = "detach_state" },
606397db	226	{ .bus = "i2c", .file = "detach_state" },
a8b5267a KS	227	{ NULL }
	228	};
	229	struct bus_file *busfile;
	230	int loop;
	231
	232	/* wait for the /bus-device link to the /device-device */
	233	loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
	234	while (--loop) {
	235	if (sysfs_get_device_bus(device_dev) == 0)
	236	break;
	237
	238	usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
	239	}
	240	if (loop == 0) {
	241	dbg("error: getting /bus-device link");
	242	return -1;
	243	}
	244	dbg("/bus-device link found for bus '%s'", device_dev->bus);
	245
	246	/* wait for a bus specific file to show up */
	247	loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
	248	while (--loop) {
e629ca3f KS	249	int found = 0;
e629ca3f KS	250
a8b5267a KS	251	for (busfile = bus_files; busfile->bus != NULL; busfile++) {
a8b5267a KS	252	if (strcmp(device_dev->bus, busfile->bus) == 0) {
e629ca3f	253	found = 1;
a8b5267a KS	254	dbg("looking at bus '%s' for specific file '%s'", device_dev->bus, busfile->file);
	255	if (sysfs_get_device_attr(device_dev, busfile->file) != NULL) {
	256	dbg("bus '%s' specific file '%s' found", device_dev->bus, busfile->file);
	257	return 0;
	258	}
a8b5267a KS	259	}
a8b5267a KS	260	}
e629ca3f KS	261	if (found == 0) {
	262	info("error: unknown bus, please report to "
	263	"<linux-hotplug-devel@lists.sourceforge.net> '%s'", device_dev->bus);
	264	return -1;
	265	}
	266	usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
a8b5267a KS	267	}
	268
	269	dbg("error: getting bus '%s' specific file '%s'", device_dev->bus, busfile->file);
	270	return -1;
	271	}
	272
	273	int main(int argc, char argv[], char envp[])
	274	{
	275	const char *devpath = "";
	276	const char *action;
	277	const char *subsystem;
	278	char sysfs_path[SYSFS_PATH_MAX];
	279	char filename[SYSFS_PATH_MAX];
	280	struct sysfs_class_device *class_dev;
	281	struct sysfs_class_device *class_dev_parent;
	282	struct sysfs_device *device_dev = NULL;
	283	int loop;
	284	int rc = 0;
	285
e629ca3f KS	286	init_logging("wait_for_sysfs");
e629ca3f KS	287
a8b5267a KS	288	if (argc != 2) {
	289	dbg("error: subsystem");
	290	return 1;
	291	}
	292	subsystem = argv[1];
	293
	294	devpath = getenv ("DEVPATH");
	295	if (!devpath) {
	296	dbg("error: no DEVPATH");
	297	return 1;
	298	}
	299
	300	action = getenv ("ACTION");
	301	if (!action) {
	302	dbg("error: no ACTION");
	303	return 1;
	304	}
	305
e629ca3f	306	/* we only wait on an add event */
a8b5267a KS	307	if (strcmp(action, "add") != 0)
	308	return 0;
	309
	310	if (sysfs_get_mnt_path(sysfs_path, SYSFS_PATH_MAX) != 0) {
	311	dbg("error: no sysfs path");
	312	return 2;
	313	}
	314
	315	if ((strncmp(devpath, "/block/", 7) == 0) \|\| (strncmp(devpath, "/class/", 7) == 0)) {
	316	/* open the class device we are called for */
	317	snprintf(filename, SYSFS_PATH_MAX-1, "%s%s", sysfs_path, devpath);
	318	filename[SYSFS_PATH_MAX-1] = '\0';
	319
	320	loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
	321	while (--loop) {
	322	class_dev = sysfs_open_class_device_path(filename);
	323	if (class_dev)
	324	break;
e629ca3f KS	325
e629ca3f KS	326	usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
a8b5267a KS	327	}
	328	if (class_dev == NULL) {
	329	dbg("error: getting class_device");
e629ca3f	330	rc = 3;
a8b5267a KS	331	goto exit;
	332	}
	333	dbg("class_device opened '%s'", filename);
	334
e629ca3f KS	335	if (wait_for_class_device_attributes(class_dev) != 0) {
	336	rc = 4;
	337	goto exit_class;
	338	}
a8b5267a	339
e629ca3f	340	/* skip devices without /device-link */
a8b5267a	341	if (class_device_expect_no_device_link(class_dev)) {
e629ca3f KS	342	dbg("no device symlink expected for '%s', ", class_dev->name);
e629ca3f KS	343	goto exit_class;
a8b5267a KS	344	}
	345
	346	/* the symlink may be on the parent device */
	347	class_dev_parent = sysfs_get_classdev_parent(class_dev);
	348	if (class_dev_parent)
	349	dbg("looking at parent device for device link '%s'", class_dev_parent->path);
	350
	351	/* wait for the symlink to the /device-device */
	352	dbg("waiting for symlink to /device-device");
	353	loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
	354	while (--loop) {
	355	if (class_dev_parent)
	356	device_dev = sysfs_get_classdev_device(class_dev_parent);
	357	else
	358	device_dev = sysfs_get_classdev_device(class_dev);
	359
	360	if (device_dev)
	361	break;
	362
	363	usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
	364	}
	365	if (device_dev == NULL) {
	366	dbg("error: getting /device-device");
a8b5267a	367	rc = 5;
e629ca3f	368	goto exit_class;
a8b5267a KS	369	}
	370	dbg("device symlink found pointing to '%s'", device_dev->path);
	371
	372	/* wait for the bus value */
e629ca3f KS	373	if (class_device_expect_no_bus(class_dev)) {
	374	dbg("no bus device expected for '%s', ", class_dev->classname);
	375	} else {
	376	if (wait_for_bus_device(device_dev) != 0)
	377	rc = 6;
	378	}
a8b5267a	379
e629ca3f KS	380	exit_class:
e629ca3f KS	381	sysfs_close_class_device(class_dev);
a8b5267a KS	382
	383	} else if ((strncmp(devpath, "/devices/", 9) == 0)) {
	384	/* open the path we are called for */
	385	snprintf(filename, SYSFS_PATH_MAX-1, "%s%s", sysfs_path, devpath);
	386	filename[SYSFS_PATH_MAX-1] = '\0';
	387
	388	loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
	389	while (--loop) {
	390	device_dev = sysfs_open_device_path(filename);
	391	if (device_dev)
	392	break;
e629ca3f KS	393
e629ca3f KS	394	usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
a8b5267a KS	395	}
	396	if (device_dev == NULL) {
	397	dbg("error: getting /device-device");
e629ca3f	398	rc = 7;
a8b5267a KS	399	goto exit;
	400	}
	401	dbg("device_device opened '%s'", filename);
	402
	403	/* wait for the bus value */
	404	if (wait_for_bus_device(device_dev) != 0)
e629ca3f	405	rc = 8;
a8b5267a KS	406
	407	sysfs_close_device(device_dev);
	408
a8b5267a KS	409	} else {
	410	dbg("unhandled sysfs path, no need to wait");
	411	}
	412
	413	exit:
	414	if (rc == 0)
e629ca3f	415	dbg("result: waiting for sysfs successful '%s'", devpath);
a8b5267a	416	else
cdd95f9a KS	417	info("either wait_for_sysfs (udev %s) needs an update to handle the device '%s' "
	418	"properly (%d) or the sysfs-support of your device's driver needs to be fixed, "
	419	"please report to <linux-hotplug-devel@lists.sourceforge.net>",
	420	UDEV_VERSION, devpath, rc);
a8b5267a KS	421
	422	return rc;
	423	}