/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /*** 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 <unistd.h> #include <getopt.h> #include <sys/epoll.h> #include "libudev.h" #include "udev-util.h" #include "util.h" #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0])) 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; int r; 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"); r = udev_enumerate_add_match_is_initialized(udev_enumerate); if (r < 0) { udev_enumerate_unref(udev_enumerate); return r; } 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_se(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]; int c; udev = udev_new(); printf("context: %p\n", udev); if (udev == NULL) { printf("no context\n"); return 1; } while ((c = getopt_long(argc, argv, "p:s:dhV", options, NULL)) >= 0) switch (c) { case 'p': syspath = optarg; break; case 's': subsystem = optarg; break; case 'd': if (log_get_max_level() < LOG_INFO) log_set_max_level(LOG_INFO); break; case 'h': printf("--debug --syspath= --subsystem= --help\n"); goto out; case 'V': printf("%s\n", VERSION); goto out; case '?': goto out; default: assert_not_reached("Unhandled option code."); } /* 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; }