The Android Open Source Project | cc49016 | 2009-03-03 19:32:14 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2008 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #include <hardware_legacy/uevent.h> |
| 18 | |
Elliott Hughes | eae613e | 2015-01-29 17:10:03 -0800 | [diff] [blame] | 19 | #include <malloc.h> |
The Android Open Source Project | cc49016 | 2009-03-03 19:32:14 -0800 | [diff] [blame] | 20 | #include <string.h> |
| 21 | #include <unistd.h> |
| 22 | #include <poll.h> |
Erik Gilling | 1cb1728 | 2010-10-20 15:59:52 -0700 | [diff] [blame] | 23 | #include <pthread.h> |
The Android Open Source Project | cc49016 | 2009-03-03 19:32:14 -0800 | [diff] [blame] | 24 | |
| 25 | #include <sys/socket.h> |
| 26 | #include <sys/un.h> |
Erik Gilling | 1cb1728 | 2010-10-20 15:59:52 -0700 | [diff] [blame] | 27 | #include <sys/queue.h> |
The Android Open Source Project | cc49016 | 2009-03-03 19:32:14 -0800 | [diff] [blame] | 28 | #include <linux/netlink.h> |
| 29 | |
| 30 | |
Erik Gilling | 1cb1728 | 2010-10-20 15:59:52 -0700 | [diff] [blame] | 31 | LIST_HEAD(uevent_handler_head, uevent_handler) uevent_handler_list; |
| 32 | pthread_mutex_t uevent_handler_list_lock = PTHREAD_MUTEX_INITIALIZER; |
| 33 | |
| 34 | struct uevent_handler { |
| 35 | void (*handler)(void *data, const char *msg, int msg_len); |
| 36 | void *handler_data; |
| 37 | LIST_ENTRY(uevent_handler) list; |
| 38 | }; |
| 39 | |
The Android Open Source Project | cc49016 | 2009-03-03 19:32:14 -0800 | [diff] [blame] | 40 | static int fd = -1; |
| 41 | |
| 42 | /* Returns 0 on failure, 1 on success */ |
| 43 | int uevent_init() |
| 44 | { |
| 45 | struct sockaddr_nl addr; |
| 46 | int sz = 64*1024; |
| 47 | int s; |
| 48 | |
| 49 | memset(&addr, 0, sizeof(addr)); |
| 50 | addr.nl_family = AF_NETLINK; |
| 51 | addr.nl_pid = getpid(); |
| 52 | addr.nl_groups = 0xffffffff; |
| 53 | |
| 54 | s = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT); |
| 55 | if(s < 0) |
| 56 | return 0; |
| 57 | |
| 58 | setsockopt(s, SOL_SOCKET, SO_RCVBUFFORCE, &sz, sizeof(sz)); |
| 59 | |
| 60 | if(bind(s, (struct sockaddr *) &addr, sizeof(addr)) < 0) { |
| 61 | close(s); |
| 62 | return 0; |
| 63 | } |
| 64 | |
| 65 | fd = s; |
| 66 | return (fd > 0); |
| 67 | } |
| 68 | |
Erik Gilling | 020418e | 2011-09-08 16:30:33 -0700 | [diff] [blame] | 69 | int uevent_get_fd() |
| 70 | { |
| 71 | return fd; |
| 72 | } |
| 73 | |
The Android Open Source Project | cc49016 | 2009-03-03 19:32:14 -0800 | [diff] [blame] | 74 | int uevent_next_event(char* buffer, int buffer_length) |
| 75 | { |
| 76 | while (1) { |
| 77 | struct pollfd fds; |
| 78 | int nr; |
| 79 | |
| 80 | fds.fd = fd; |
| 81 | fds.events = POLLIN; |
| 82 | fds.revents = 0; |
| 83 | nr = poll(&fds, 1, -1); |
| 84 | |
Mathias Agopian | 3aabb26 | 2012-10-01 14:53:18 -0700 | [diff] [blame] | 85 | if(nr > 0 && (fds.revents & POLLIN)) { |
The Android Open Source Project | cc49016 | 2009-03-03 19:32:14 -0800 | [diff] [blame] | 86 | int count = recv(fd, buffer, buffer_length, 0); |
| 87 | if (count > 0) { |
Erik Gilling | 1cb1728 | 2010-10-20 15:59:52 -0700 | [diff] [blame] | 88 | struct uevent_handler *h; |
| 89 | pthread_mutex_lock(&uevent_handler_list_lock); |
| 90 | LIST_FOREACH(h, &uevent_handler_list, list) |
| 91 | h->handler(h->handler_data, buffer, buffer_length); |
| 92 | pthread_mutex_unlock(&uevent_handler_list_lock); |
| 93 | |
The Android Open Source Project | cc49016 | 2009-03-03 19:32:14 -0800 | [diff] [blame] | 94 | return count; |
| 95 | } |
| 96 | } |
| 97 | } |
| 98 | |
| 99 | // won't get here |
| 100 | return 0; |
| 101 | } |
Erik Gilling | 1cb1728 | 2010-10-20 15:59:52 -0700 | [diff] [blame] | 102 | |
| 103 | int uevent_add_native_handler(void (*handler)(void *data, const char *msg, int msg_len), |
| 104 | void *handler_data) |
| 105 | { |
| 106 | struct uevent_handler *h; |
| 107 | |
| 108 | h = malloc(sizeof(struct uevent_handler)); |
| 109 | if (h == NULL) |
| 110 | return -1; |
| 111 | h->handler = handler; |
| 112 | h->handler_data = handler_data; |
| 113 | |
| 114 | pthread_mutex_lock(&uevent_handler_list_lock); |
| 115 | LIST_INSERT_HEAD(&uevent_handler_list, h, list); |
| 116 | pthread_mutex_unlock(&uevent_handler_list_lock); |
| 117 | |
| 118 | return 0; |
| 119 | } |
| 120 | |
| 121 | int uevent_remove_native_handler(void (*handler)(void *data, const char *msg, int msg_len)) |
| 122 | { |
| 123 | struct uevent_handler *h; |
| 124 | int err = -1; |
| 125 | |
| 126 | pthread_mutex_lock(&uevent_handler_list_lock); |
| 127 | LIST_FOREACH(h, &uevent_handler_list, list) { |
| 128 | if (h->handler == handler) { |
| 129 | LIST_REMOVE(h, list); |
| 130 | err = 0; |
| 131 | break; |
| 132 | } |
| 133 | } |
| 134 | pthread_mutex_unlock(&uevent_handler_list_lock); |
| 135 | |
| 136 | return err; |
| 137 | } |