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9ea28c55a2
systemd/src/test/test-libudev.c
Kay Sievers 9ea28c55a2 udev: remove seqnum API and all assumptions about seqnums 
The way the kernel namespaces have been implemented breaks assumptions
udev made regarding uevent sequence numbers. Creating devices in a
namespace "steals" uevents and its sequence numbers from the host. It
confuses the "udevadmin settle" logic, which might block until util a
timeout is reached, even when no uevent is pending.

Remove any assumptions about sequence numbers and deprecate libudev's
API exposing these numbers; none of that can reliably be used anymore
when namespaces are involved.
2014-04-13 17:12:14 -07:00

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/***
This file is part of systemd.
Copyright 2008-2012 Kay Sievers <kay@vrfy.org>
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <getopt.h>
#include <syslog.h>
#include <fcntl.h>
#include <sys/epoll.h>
#include "libudev.h"
#include "udev-util.h"
#include "util.h"
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
_printf_(6,0)
static void log_fn(struct udev *udev,
int priority, const char *file, int line, const char *fn,
const char *format, va_list args) {
printf("test-libudev: %s %s:%d ", fn, file, line);
vprintf(format, args);
}
static void print_device(struct udev_device *device) {
const char *str;
dev_t devnum;
int count;
struct udev_list_entry *list_entry;
printf("*** device: %p ***\n", device);
str = udev_device_get_action(device);
if (str != NULL)
printf("action: '%s'\n", str);
str = udev_device_get_syspath(device);
printf("syspath: '%s'\n", str);
str = udev_device_get_sysname(device);
printf("sysname: '%s'\n", str);
str = udev_device_get_sysnum(device);
if (str != NULL)
printf("sysnum: '%s'\n", str);
str = udev_device_get_devpath(device);
printf("devpath: '%s'\n", str);
str = udev_device_get_subsystem(device);
if (str != NULL)
printf("subsystem: '%s'\n", str);
str = udev_device_get_devtype(device);
if (str != NULL)
printf("devtype: '%s'\n", str);
str = udev_device_get_driver(device);
if (str != NULL)
printf("driver: '%s'\n", str);
str = udev_device_get_devnode(device);
if (str != NULL)
printf("devname: '%s'\n", str);
devnum = udev_device_get_devnum(device);
if (major(devnum) > 0)
printf("devnum: %u:%u\n", major(devnum), minor(devnum));
count = 0;
udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(device)) {
printf("link: '%s'\n", udev_list_entry_get_name(list_entry));
count++;
}
if (count > 0)
printf("found %i links\n", count);
count = 0;
udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(device)) {
printf("property: '%s=%s'\n",
udev_list_entry_get_name(list_entry),
udev_list_entry_get_value(list_entry));
count++;
}
if (count > 0)
printf("found %i properties\n", count);
str = udev_device_get_property_value(device, "MAJOR");
if (str != NULL)
printf("MAJOR: '%s'\n", str);
str = udev_device_get_sysattr_value(device, "dev");
if (str != NULL)
printf("attr{dev}: '%s'\n", str);
printf("\n");
}
static int test_device(struct udev *udev, const char *syspath) {
_cleanup_udev_device_unref_ struct udev_device *device;
printf("looking at device: %s\n", syspath);
device = udev_device_new_from_syspath(udev, syspath);
if (device == NULL) {
printf("no device found\n");
return -1;
}
print_device(device);
return 0;
}
static int test_device_parents(struct udev *udev, const char *syspath) {
_cleanup_udev_device_unref_ struct udev_device *device;
struct udev_device *device_parent;
printf("looking at device: %s\n", syspath);
device = udev_device_new_from_syspath(udev, syspath);
if (device == NULL)
return -1;
printf("looking at parents\n");
device_parent = device;
do {
print_device(device_parent);
device_parent = udev_device_get_parent(device_parent);
} while (device_parent != NULL);
printf("looking at parents again\n");
device_parent = device;
do {
print_device(device_parent);
device_parent = udev_device_get_parent(device_parent);
} while (device_parent != NULL);
return 0;
}
static int test_device_devnum(struct udev *udev) {
dev_t devnum = makedev(1, 3);
struct udev_device *device;
printf("looking up device: %u:%u\n", major(devnum), minor(devnum));
device = udev_device_new_from_devnum(udev, 'c', devnum);
if (device == NULL)
return -1;
print_device(device);
udev_device_unref(device);
return 0;
}
static int test_device_subsys_name(struct udev *udev) {
struct udev_device *device;
printf("looking up device: 'block':'sda'\n");
device = udev_device_new_from_subsystem_sysname(udev, "block", "sda");
if (device == NULL)
return -1;
print_device(device);
udev_device_unref(device);
printf("looking up device: 'subsystem':'pci'\n");
device = udev_device_new_from_subsystem_sysname(udev, "subsystem", "pci");
if (device == NULL)
return -1;
print_device(device);
udev_device_unref(device);
printf("looking up device: 'drivers':'scsi:sd'\n");
device = udev_device_new_from_subsystem_sysname(udev, "drivers", "scsi:sd");
if (device == NULL)
return -1;
print_device(device);
udev_device_unref(device);
printf("looking up device: 'module':'printk'\n");
device = udev_device_new_from_subsystem_sysname(udev, "module", "printk");
if (device == NULL)
return -1;
print_device(device);
udev_device_unref(device);
return 0;
}
static int test_enumerate_print_list(struct udev_enumerate *enumerate) {
struct udev_list_entry *list_entry;
int count = 0;
udev_list_entry_foreach(list_entry, udev_enumerate_get_list_entry(enumerate)) {
struct udev_device *device;
device = udev_device_new_from_syspath(udev_enumerate_get_udev(enumerate),
udev_list_entry_get_name(list_entry));
if (device != NULL) {
printf("device: '%s' (%s)\n",
udev_device_get_syspath(device),
udev_device_get_subsystem(device));
udev_device_unref(device);
count++;
}
}
printf("found %i devices\n\n", count);
return count;
}
static int test_monitor(struct udev *udev) {
struct udev_monitor *udev_monitor = NULL;
int fd_ep;
int fd_udev = -1;
struct epoll_event ep_udev, ep_stdin;
fd_ep = epoll_create1(EPOLL_CLOEXEC);
if (fd_ep < 0) {
printf("error creating epoll fd: %m\n");
goto out;
}
udev_monitor = udev_monitor_new_from_netlink(udev, "udev");
if (udev_monitor == NULL) {
printf("no socket\n");
goto out;
}
fd_udev = udev_monitor_get_fd(udev_monitor);
if (udev_monitor_filter_add_match_subsystem_devtype(udev_monitor, "block", NULL) < 0 ||
udev_monitor_filter_add_match_subsystem_devtype(udev_monitor, "tty", NULL) < 0 ||
udev_monitor_filter_add_match_subsystem_devtype(udev_monitor, "usb", "usb_device") < 0) {
printf("filter failed\n");
goto out;
}
if (udev_monitor_enable_receiving(udev_monitor) < 0) {
printf("bind failed\n");
goto out;
}
memzero(&ep_udev, sizeof(struct epoll_event));
ep_udev.events = EPOLLIN;
ep_udev.data.fd = fd_udev;
if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_udev, &ep_udev) < 0) {
printf("fail to add fd to epoll: %m\n");
goto out;
}
memzero(&ep_stdin, sizeof(struct epoll_event));
ep_stdin.events = EPOLLIN;
ep_stdin.data.fd = STDIN_FILENO;
if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, STDIN_FILENO, &ep_stdin) < 0) {
printf("fail to add fd to epoll: %m\n");
goto out;
}
for (;;) {
int fdcount;
struct epoll_event ev[4];
struct udev_device *device;
int i;
printf("waiting for events from udev, press ENTER to exit\n");
fdcount = epoll_wait(fd_ep, ev, ARRAY_SIZE(ev), -1);
printf("epoll fd count: %i\n", fdcount);
for (i = 0; i < fdcount; i++) {
if (ev[i].data.fd == fd_udev && ev[i].events & EPOLLIN) {
device = udev_monitor_receive_device(udev_monitor);
if (device == NULL) {
printf("no device from socket\n");
continue;
}
print_device(device);
udev_device_unref(device);
} else if (ev[i].data.fd == STDIN_FILENO && ev[i].events & EPOLLIN) {
printf("exiting loop\n");
goto out;
}
}
}
out:
if (fd_ep >= 0)
close(fd_ep);
udev_monitor_unref(udev_monitor);
return 0;
}
static int test_queue(struct udev *udev) {
struct udev_queue *udev_queue;
udev_queue = udev_queue_new(udev);
if (udev_queue == NULL)
return -1;
if (udev_queue_get_queue_is_empty(udev_queue))
printf("queue is empty\n");
udev_queue_unref(udev_queue);
return 0;
}
static int test_enumerate(struct udev *udev, const char *subsystem) {
struct udev_enumerate *udev_enumerate;
printf("enumerate '%s'\n", subsystem == NULL ? "<all>" : subsystem);
udev_enumerate = udev_enumerate_new(udev);
if (udev_enumerate == NULL)
return -1;
udev_enumerate_add_match_subsystem(udev_enumerate, subsystem);
udev_enumerate_scan_devices(udev_enumerate);
test_enumerate_print_list(udev_enumerate);
udev_enumerate_unref(udev_enumerate);
printf("enumerate 'net' + duplicated scan + null + zero\n");
udev_enumerate = udev_enumerate_new(udev);
if (udev_enumerate == NULL)
return -1;
udev_enumerate_add_match_subsystem(udev_enumerate, "net");
udev_enumerate_scan_devices(udev_enumerate);
udev_enumerate_scan_devices(udev_enumerate);
udev_enumerate_add_syspath(udev_enumerate, "/sys/class/mem/zero");
udev_enumerate_add_syspath(udev_enumerate, "/sys/class/mem/null");
udev_enumerate_add_syspath(udev_enumerate, "/sys/class/mem/zero");
udev_enumerate_add_syspath(udev_enumerate, "/sys/class/mem/null");
udev_enumerate_add_syspath(udev_enumerate, "/sys/class/mem/zero");
udev_enumerate_add_syspath(udev_enumerate, "/sys/class/mem/null");
udev_enumerate_add_syspath(udev_enumerate, "/sys/class/mem/null");
udev_enumerate_add_syspath(udev_enumerate, "/sys/class/mem/zero");
udev_enumerate_add_syspath(udev_enumerate, "/sys/class/mem/zero");
udev_enumerate_scan_devices(udev_enumerate);
test_enumerate_print_list(udev_enumerate);
udev_enumerate_unref(udev_enumerate);
printf("enumerate 'block'\n");
udev_enumerate = udev_enumerate_new(udev);
if (udev_enumerate == NULL)
return -1;
udev_enumerate_add_match_subsystem(udev_enumerate,"block");
udev_enumerate_add_match_is_initialized(udev_enumerate);
udev_enumerate_scan_devices(udev_enumerate);
test_enumerate_print_list(udev_enumerate);
udev_enumerate_unref(udev_enumerate);
printf("enumerate 'not block'\n");
udev_enumerate = udev_enumerate_new(udev);
if (udev_enumerate == NULL)
return -1;
udev_enumerate_add_nomatch_subsystem(udev_enumerate, "block");
udev_enumerate_scan_devices(udev_enumerate);
test_enumerate_print_list(udev_enumerate);
udev_enumerate_unref(udev_enumerate);
printf("enumerate 'pci, mem, vc'\n");
udev_enumerate = udev_enumerate_new(udev);
if (udev_enumerate == NULL)
return -1;
udev_enumerate_add_match_subsystem(udev_enumerate, "pci");
udev_enumerate_add_match_subsystem(udev_enumerate, "mem");
udev_enumerate_add_match_subsystem(udev_enumerate, "vc");
udev_enumerate_scan_devices(udev_enumerate);
test_enumerate_print_list(udev_enumerate);
udev_enumerate_unref(udev_enumerate);
printf("enumerate 'subsystem'\n");
udev_enumerate = udev_enumerate_new(udev);
if (udev_enumerate == NULL)
return -1;
udev_enumerate_scan_subsystems(udev_enumerate);
test_enumerate_print_list(udev_enumerate);
udev_enumerate_unref(udev_enumerate);
printf("enumerate 'property IF_FS_*=filesystem'\n");
udev_enumerate = udev_enumerate_new(udev);
if (udev_enumerate == NULL)
return -1;
udev_enumerate_add_match_property(udev_enumerate, "ID_FS*", "filesystem");
udev_enumerate_scan_devices(udev_enumerate);
test_enumerate_print_list(udev_enumerate);
udev_enumerate_unref(udev_enumerate);
return 0;
}
static void test_hwdb(struct udev *udev, const char *modalias) {
struct udev_hwdb *hwdb;
struct udev_list_entry *entry;
hwdb = udev_hwdb_new(udev);
udev_list_entry_foreach(entry, udev_hwdb_get_properties_list_entry(hwdb, modalias, 0))
printf("'%s'='%s'\n", udev_list_entry_get_name(entry), udev_list_entry_get_value(entry));
printf("\n");
hwdb = udev_hwdb_unref(hwdb);
assert(hwdb == NULL);
}
int main(int argc, char *argv[]) {
struct udev *udev = NULL;
static const struct option options[] = {
{ "syspath", required_argument, NULL, 'p' },
{ "subsystem", required_argument, NULL, 's' },
{ "debug", no_argument, NULL, 'd' },
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, 'V' },
{}
};
const char *syspath = "/devices/virtual/mem/null";
const char *subsystem = NULL;
char path[1024];
udev = udev_new();
printf("context: %p\n", udev);
if (udev == NULL) {
printf("no context\n");
return 1;
}
udev_set_log_fn(udev, log_fn);
printf("set log: %p\n", log_fn);
for (;;) {
int option;
option = getopt_long(argc, argv, "+p:s:dhV", options, NULL);
if (option == -1)
break;
switch (option) {
case 'p':
syspath = optarg;
break;
case 's':
subsystem = optarg;
break;
case 'd':
if (udev_get_log_priority(udev) < LOG_INFO)
udev_set_log_priority(udev, LOG_INFO);
break;
case 'h':
printf("--debug --syspath= --subsystem= --help\n");
goto out;
case 'V':
printf("%s\n", VERSION);
goto out;
default:
goto out;
}
}
/* add sys path if needed */
if (!startswith(syspath, "/sys")) {
snprintf(path, sizeof(path), "/sys/%s", syspath);
syspath = path;
}
test_device(udev, syspath);
test_device_devnum(udev);
test_device_subsys_name(udev);
test_device_parents(udev, syspath);
test_enumerate(udev, subsystem);
test_queue(udev);
test_hwdb(udev, "usb:v0D50p0011*");
test_monitor(udev);
out:
udev_unref(udev);
return 0;
}
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