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a75eb03b DM |
1 | /* |
2 | * Copyright 6WIND S.A., 2014 | |
3 | * | |
4 | * This work is licensed under the terms of the GNU GPL, version 2 or | |
5 | * (at your option) any later version. See the COPYING file in the | |
6 | * top-level directory. | |
7 | */ | |
8 | ||
ccd241b5 | 9 | #include "qemu/osdep.h" |
da34e65c | 10 | #include "qapi/error.h" |
f348b6d1 | 11 | #include "qemu/cutils.h" |
922a01a0 | 12 | #include "qemu/option.h" |
a75eb03b DM |
13 | #include "ivshmem-server.h" |
14 | ||
15 | #define IVSHMEM_SERVER_DEFAULT_VERBOSE 0 | |
16 | #define IVSHMEM_SERVER_DEFAULT_FOREGROUND 0 | |
17 | #define IVSHMEM_SERVER_DEFAULT_PID_FILE "/var/run/ivshmem-server.pid" | |
18 | #define IVSHMEM_SERVER_DEFAULT_UNIX_SOCK_PATH "/tmp/ivshmem_socket" | |
19 | #define IVSHMEM_SERVER_DEFAULT_SHM_PATH "ivshmem" | |
d62cc7fe | 20 | #define IVSHMEM_SERVER_DEFAULT_SHM_SIZE (4 * 1024 * 1024) |
a75eb03b DM |
21 | #define IVSHMEM_SERVER_DEFAULT_N_VECTORS 1 |
22 | ||
23 | /* used to quit on signal SIGTERM */ | |
24 | static int ivshmem_server_quit; | |
25 | ||
26 | /* arguments given by the user */ | |
27 | typedef struct IvshmemServerArgs { | |
28 | bool verbose; | |
29 | bool foreground; | |
30 | const char *pid_file; | |
31 | const char *unix_socket_path; | |
32 | const char *shm_path; | |
3625c739 | 33 | bool use_shm_open; |
a75eb03b DM |
34 | uint64_t shm_size; |
35 | unsigned n_vectors; | |
36 | } IvshmemServerArgs; | |
37 | ||
a75eb03b | 38 | static void |
e3ad7296 | 39 | ivshmem_server_usage(const char *progname) |
a75eb03b | 40 | { |
e3ad7296 MA |
41 | printf("Usage: %s [OPTION]...\n" |
42 | " -h: show this help\n" | |
43 | " -v: verbose mode\n" | |
44 | " -F: foreground mode (default is to daemonize)\n" | |
45 | " -p <pid-file>: path to the PID file (used in daemon mode only)\n" | |
46 | " default " IVSHMEM_SERVER_DEFAULT_PID_FILE "\n" | |
47 | " -S <unix-socket-path>: path to the unix socket to listen to\n" | |
48 | " default " IVSHMEM_SERVER_DEFAULT_UNIX_SOCK_PATH "\n" | |
3625c739 | 49 | " -M <shm-name>: POSIX shared memory object to use\n" |
e3ad7296 | 50 | " default " IVSHMEM_SERVER_DEFAULT_SHM_PATH "\n" |
3625c739 | 51 | " -m <dir-name>: where to create shared memory\n" |
e3ad7296 MA |
52 | " -l <size>: size of shared memory in bytes\n" |
53 | " suffixes K, M and G can be used, e.g. 1K means 1024\n" | |
54 | " default %u\n" | |
55 | " -n <nvectors>: number of vectors\n" | |
56 | " default %u\n", | |
57 | progname, IVSHMEM_SERVER_DEFAULT_SHM_SIZE, | |
58 | IVSHMEM_SERVER_DEFAULT_N_VECTORS); | |
59 | } | |
60 | ||
61 | static void | |
62 | ivshmem_server_help(const char *progname) | |
63 | { | |
64 | fprintf(stderr, "Try '%s -h' for more information.\n", progname); | |
a75eb03b DM |
65 | } |
66 | ||
67 | /* parse the program arguments, exit on error */ | |
68 | static void | |
69 | ivshmem_server_parse_args(IvshmemServerArgs *args, int argc, char *argv[]) | |
70 | { | |
71 | int c; | |
72 | unsigned long long v; | |
533fdaed | 73 | Error *err = NULL; |
a75eb03b | 74 | |
3625c739 | 75 | while ((c = getopt(argc, argv, "hvFp:S:m:M:l:n:")) != -1) { |
a75eb03b DM |
76 | |
77 | switch (c) { | |
78 | case 'h': /* help */ | |
e3ad7296 MA |
79 | ivshmem_server_usage(argv[0]); |
80 | exit(0); | |
a75eb03b DM |
81 | break; |
82 | ||
83 | case 'v': /* verbose */ | |
84 | args->verbose = 1; | |
85 | break; | |
86 | ||
87 | case 'F': /* foreground */ | |
88 | args->foreground = 1; | |
89 | break; | |
90 | ||
e3ad7296 | 91 | case 'p': /* pid file */ |
45b00c44 | 92 | args->pid_file = optarg; |
a75eb03b DM |
93 | break; |
94 | ||
e3ad7296 | 95 | case 'S': /* unix socket path */ |
45b00c44 | 96 | args->unix_socket_path = optarg; |
a75eb03b DM |
97 | break; |
98 | ||
3625c739 MA |
99 | case 'M': /* shm name */ |
100 | case 'm': /* dir name */ | |
45b00c44 | 101 | args->shm_path = optarg; |
3625c739 | 102 | args->use_shm_open = c == 'M'; |
a75eb03b DM |
103 | break; |
104 | ||
e3ad7296 | 105 | case 'l': /* shm size */ |
235e59cf MA |
106 | if (!parse_option_size("shm_size", optarg, &args->shm_size, |
107 | &err)) { | |
533fdaed | 108 | error_report_err(err); |
e3ad7296 MA |
109 | ivshmem_server_help(argv[0]); |
110 | exit(1); | |
a75eb03b DM |
111 | } |
112 | break; | |
113 | ||
e3ad7296 | 114 | case 'n': /* number of vectors */ |
a75eb03b DM |
115 | if (parse_uint_full(optarg, &v, 0) < 0) { |
116 | fprintf(stderr, "cannot parse n_vectors\n"); | |
e3ad7296 MA |
117 | ivshmem_server_help(argv[0]); |
118 | exit(1); | |
a75eb03b DM |
119 | } |
120 | args->n_vectors = v; | |
121 | break; | |
122 | ||
123 | default: | |
e3ad7296 MA |
124 | ivshmem_server_usage(argv[0]); |
125 | exit(1); | |
a75eb03b DM |
126 | break; |
127 | } | |
128 | } | |
129 | ||
130 | if (args->n_vectors > IVSHMEM_SERVER_MAX_VECTORS) { | |
131 | fprintf(stderr, "too many requested vectors (max is %d)\n", | |
132 | IVSHMEM_SERVER_MAX_VECTORS); | |
e3ad7296 MA |
133 | ivshmem_server_help(argv[0]); |
134 | exit(1); | |
a75eb03b DM |
135 | } |
136 | ||
137 | if (args->verbose == 1 && args->foreground == 0) { | |
138 | fprintf(stderr, "cannot use verbose in daemon mode\n"); | |
e3ad7296 MA |
139 | ivshmem_server_help(argv[0]); |
140 | exit(1); | |
a75eb03b DM |
141 | } |
142 | } | |
143 | ||
144 | /* wait for events on listening server unix socket and connected client | |
145 | * sockets */ | |
146 | static int | |
147 | ivshmem_server_poll_events(IvshmemServer *server) | |
148 | { | |
149 | fd_set fds; | |
150 | int ret = 0, maxfd; | |
151 | ||
152 | while (!ivshmem_server_quit) { | |
153 | ||
154 | FD_ZERO(&fds); | |
155 | maxfd = 0; | |
156 | ivshmem_server_get_fds(server, &fds, &maxfd); | |
157 | ||
158 | ret = select(maxfd, &fds, NULL, NULL, NULL); | |
159 | ||
160 | if (ret < 0) { | |
161 | if (errno == EINTR) { | |
162 | continue; | |
163 | } | |
164 | ||
165 | fprintf(stderr, "select error: %s\n", strerror(errno)); | |
166 | break; | |
167 | } | |
168 | if (ret == 0) { | |
169 | continue; | |
170 | } | |
171 | ||
172 | if (ivshmem_server_handle_fds(server, &fds, maxfd) < 0) { | |
173 | fprintf(stderr, "ivshmem_server_handle_fds() failed\n"); | |
174 | break; | |
175 | } | |
176 | } | |
177 | ||
178 | return ret; | |
179 | } | |
180 | ||
181 | static void | |
182 | ivshmem_server_quit_cb(int signum) | |
183 | { | |
184 | ivshmem_server_quit = 1; | |
185 | } | |
186 | ||
187 | int | |
188 | main(int argc, char *argv[]) | |
189 | { | |
190 | IvshmemServer server; | |
191 | struct sigaction sa, sa_quit; | |
192 | IvshmemServerArgs args = { | |
193 | .verbose = IVSHMEM_SERVER_DEFAULT_VERBOSE, | |
194 | .foreground = IVSHMEM_SERVER_DEFAULT_FOREGROUND, | |
195 | .pid_file = IVSHMEM_SERVER_DEFAULT_PID_FILE, | |
196 | .unix_socket_path = IVSHMEM_SERVER_DEFAULT_UNIX_SOCK_PATH, | |
197 | .shm_path = IVSHMEM_SERVER_DEFAULT_SHM_PATH, | |
3625c739 | 198 | .use_shm_open = true, |
a75eb03b DM |
199 | .shm_size = IVSHMEM_SERVER_DEFAULT_SHM_SIZE, |
200 | .n_vectors = IVSHMEM_SERVER_DEFAULT_N_VECTORS, | |
201 | }; | |
202 | int ret = 1; | |
203 | ||
a335c6f2 MA |
204 | /* |
205 | * Do not remove this notice without adding proper error handling! | |
206 | * Start with handling ivshmem_server_send_one_msg() failure. | |
207 | */ | |
208 | printf("*** Example code, do not use in production ***\n"); | |
209 | ||
a75eb03b DM |
210 | /* parse arguments, will exit on error */ |
211 | ivshmem_server_parse_args(&args, argc, argv); | |
212 | ||
213 | /* Ignore SIGPIPE, see this link for more info: | |
214 | * http://www.mail-archive.com/libevent-users@monkey.org/msg01606.html */ | |
215 | sa.sa_handler = SIG_IGN; | |
216 | sa.sa_flags = 0; | |
217 | if (sigemptyset(&sa.sa_mask) == -1 || | |
218 | sigaction(SIGPIPE, &sa, 0) == -1) { | |
219 | perror("failed to ignore SIGPIPE; sigaction"); | |
220 | goto err; | |
221 | } | |
222 | ||
223 | sa_quit.sa_handler = ivshmem_server_quit_cb; | |
224 | sa_quit.sa_flags = 0; | |
225 | if (sigemptyset(&sa_quit.sa_mask) == -1 || | |
5c62979e JK |
226 | sigaction(SIGTERM, &sa_quit, 0) == -1 || |
227 | sigaction(SIGINT, &sa_quit, 0) == -1) { | |
228 | perror("failed to add signal handler; sigaction"); | |
a75eb03b DM |
229 | goto err; |
230 | } | |
231 | ||
232 | /* init the ivshms structure */ | |
3625c739 MA |
233 | if (ivshmem_server_init(&server, args.unix_socket_path, |
234 | args.shm_path, args.use_shm_open, | |
a75eb03b DM |
235 | args.shm_size, args.n_vectors, args.verbose) < 0) { |
236 | fprintf(stderr, "cannot init server\n"); | |
237 | goto err; | |
238 | } | |
239 | ||
240 | /* start the ivshmem server (open shm & unix socket) */ | |
241 | if (ivshmem_server_start(&server) < 0) { | |
242 | fprintf(stderr, "cannot bind\n"); | |
243 | goto err; | |
244 | } | |
245 | ||
246 | /* daemonize if asked to */ | |
247 | if (!args.foreground) { | |
248 | FILE *fp; | |
249 | ||
250 | if (qemu_daemon(1, 1) < 0) { | |
251 | fprintf(stderr, "cannot daemonize: %s\n", strerror(errno)); | |
252 | goto err_close; | |
253 | } | |
254 | ||
255 | /* write pid file */ | |
256 | fp = fopen(args.pid_file, "w"); | |
257 | if (fp == NULL) { | |
258 | fprintf(stderr, "cannot write pid file: %s\n", strerror(errno)); | |
259 | goto err_close; | |
260 | } | |
261 | ||
262 | fprintf(fp, "%d\n", (int) getpid()); | |
263 | fclose(fp); | |
264 | } | |
265 | ||
266 | ivshmem_server_poll_events(&server); | |
267 | fprintf(stdout, "server disconnected\n"); | |
268 | ret = 0; | |
269 | ||
270 | err_close: | |
271 | ivshmem_server_close(&server); | |
272 | err: | |
273 | return ret; | |
274 | } |