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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 | ||
9 | #include "qemu-common.h" | |
10 | ||
11 | #include "ivshmem-server.h" | |
12 | ||
13 | #define IVSHMEM_SERVER_DEFAULT_VERBOSE 0 | |
14 | #define IVSHMEM_SERVER_DEFAULT_FOREGROUND 0 | |
15 | #define IVSHMEM_SERVER_DEFAULT_PID_FILE "/var/run/ivshmem-server.pid" | |
16 | #define IVSHMEM_SERVER_DEFAULT_UNIX_SOCK_PATH "/tmp/ivshmem_socket" | |
17 | #define IVSHMEM_SERVER_DEFAULT_SHM_PATH "ivshmem" | |
18 | #define IVSHMEM_SERVER_DEFAULT_SHM_SIZE (4*1024*1024) | |
19 | #define IVSHMEM_SERVER_DEFAULT_N_VECTORS 1 | |
20 | ||
21 | /* used to quit on signal SIGTERM */ | |
22 | static int ivshmem_server_quit; | |
23 | ||
24 | /* arguments given by the user */ | |
25 | typedef struct IvshmemServerArgs { | |
26 | bool verbose; | |
27 | bool foreground; | |
28 | const char *pid_file; | |
29 | const char *unix_socket_path; | |
30 | const char *shm_path; | |
31 | uint64_t shm_size; | |
32 | unsigned n_vectors; | |
33 | } IvshmemServerArgs; | |
34 | ||
35 | /* show ivshmem_server_usage and exit with given error code */ | |
36 | static void | |
37 | ivshmem_server_usage(const char *name, int code) | |
38 | { | |
39 | fprintf(stderr, "%s [opts]\n", name); | |
40 | fprintf(stderr, " -h: show this help\n"); | |
41 | fprintf(stderr, " -v: verbose mode\n"); | |
42 | fprintf(stderr, " -F: foreground mode (default is to daemonize)\n"); | |
43 | fprintf(stderr, " -p <pid_file>: path to the PID file (used in daemon\n" | |
44 | " mode only).\n" | |
45 | " Default=%s\n", IVSHMEM_SERVER_DEFAULT_SHM_PATH); | |
46 | fprintf(stderr, " -S <unix_socket_path>: path to the unix socket\n" | |
47 | " to listen to.\n" | |
48 | " Default=%s\n", IVSHMEM_SERVER_DEFAULT_UNIX_SOCK_PATH); | |
49 | fprintf(stderr, " -m <shm_path>: path to the shared memory.\n" | |
50 | " The path corresponds to a POSIX shm name. To use a\n" | |
51 | " real file, for instance in a hugetlbfs, use\n" | |
52 | " /../../abspath/to/file.\n" | |
53 | " default=%s\n", IVSHMEM_SERVER_DEFAULT_SHM_PATH); | |
54 | fprintf(stderr, " -l <size>: size of shared memory in bytes. The suffix\n" | |
55 | " K, M and G can be used (ex: 1K means 1024).\n" | |
56 | " default=%u\n", IVSHMEM_SERVER_DEFAULT_SHM_SIZE); | |
57 | fprintf(stderr, " -n <n_vects>: number of vectors.\n" | |
58 | " default=%u\n", IVSHMEM_SERVER_DEFAULT_N_VECTORS); | |
59 | ||
60 | exit(code); | |
61 | } | |
62 | ||
63 | /* parse the program arguments, exit on error */ | |
64 | static void | |
65 | ivshmem_server_parse_args(IvshmemServerArgs *args, int argc, char *argv[]) | |
66 | { | |
67 | int c; | |
68 | unsigned long long v; | |
69 | Error *errp = NULL; | |
70 | ||
71 | while ((c = getopt(argc, argv, | |
72 | "h" /* help */ | |
73 | "v" /* verbose */ | |
74 | "F" /* foreground */ | |
75 | "p:" /* pid_file */ | |
76 | "S:" /* unix_socket_path */ | |
77 | "m:" /* shm_path */ | |
78 | "l:" /* shm_size */ | |
79 | "n:" /* n_vectors */ | |
80 | )) != -1) { | |
81 | ||
82 | switch (c) { | |
83 | case 'h': /* help */ | |
84 | ivshmem_server_usage(argv[0], 0); | |
85 | break; | |
86 | ||
87 | case 'v': /* verbose */ | |
88 | args->verbose = 1; | |
89 | break; | |
90 | ||
91 | case 'F': /* foreground */ | |
92 | args->foreground = 1; | |
93 | break; | |
94 | ||
95 | case 'p': /* pid_file */ | |
96 | args->pid_file = strdup(optarg); | |
97 | break; | |
98 | ||
99 | case 'S': /* unix_socket_path */ | |
100 | args->unix_socket_path = strdup(optarg); | |
101 | break; | |
102 | ||
103 | case 'm': /* shm_path */ | |
104 | args->shm_path = strdup(optarg); | |
105 | break; | |
106 | ||
107 | case 'l': /* shm_size */ | |
108 | parse_option_size("shm_size", optarg, &args->shm_size, &errp); | |
109 | if (errp) { | |
110 | fprintf(stderr, "cannot parse shm size: %s\n", | |
111 | error_get_pretty(errp)); | |
112 | error_free(errp); | |
113 | ivshmem_server_usage(argv[0], 1); | |
114 | } | |
115 | break; | |
116 | ||
117 | case 'n': /* n_vectors */ | |
118 | if (parse_uint_full(optarg, &v, 0) < 0) { | |
119 | fprintf(stderr, "cannot parse n_vectors\n"); | |
120 | ivshmem_server_usage(argv[0], 1); | |
121 | } | |
122 | args->n_vectors = v; | |
123 | break; | |
124 | ||
125 | default: | |
126 | ivshmem_server_usage(argv[0], 1); | |
127 | break; | |
128 | } | |
129 | } | |
130 | ||
131 | if (args->n_vectors > IVSHMEM_SERVER_MAX_VECTORS) { | |
132 | fprintf(stderr, "too many requested vectors (max is %d)\n", | |
133 | IVSHMEM_SERVER_MAX_VECTORS); | |
134 | ivshmem_server_usage(argv[0], 1); | |
135 | } | |
136 | ||
137 | if (args->verbose == 1 && args->foreground == 0) { | |
138 | fprintf(stderr, "cannot use verbose in daemon mode\n"); | |
139 | ivshmem_server_usage(argv[0], 1); | |
140 | } | |
141 | } | |
142 | ||
143 | /* wait for events on listening server unix socket and connected client | |
144 | * sockets */ | |
145 | static int | |
146 | ivshmem_server_poll_events(IvshmemServer *server) | |
147 | { | |
148 | fd_set fds; | |
149 | int ret = 0, maxfd; | |
150 | ||
151 | while (!ivshmem_server_quit) { | |
152 | ||
153 | FD_ZERO(&fds); | |
154 | maxfd = 0; | |
155 | ivshmem_server_get_fds(server, &fds, &maxfd); | |
156 | ||
157 | ret = select(maxfd, &fds, NULL, NULL, NULL); | |
158 | ||
159 | if (ret < 0) { | |
160 | if (errno == EINTR) { | |
161 | continue; | |
162 | } | |
163 | ||
164 | fprintf(stderr, "select error: %s\n", strerror(errno)); | |
165 | break; | |
166 | } | |
167 | if (ret == 0) { | |
168 | continue; | |
169 | } | |
170 | ||
171 | if (ivshmem_server_handle_fds(server, &fds, maxfd) < 0) { | |
172 | fprintf(stderr, "ivshmem_server_handle_fds() failed\n"); | |
173 | break; | |
174 | } | |
175 | } | |
176 | ||
177 | return ret; | |
178 | } | |
179 | ||
180 | static void | |
181 | ivshmem_server_quit_cb(int signum) | |
182 | { | |
183 | ivshmem_server_quit = 1; | |
184 | } | |
185 | ||
186 | int | |
187 | main(int argc, char *argv[]) | |
188 | { | |
189 | IvshmemServer server; | |
190 | struct sigaction sa, sa_quit; | |
191 | IvshmemServerArgs args = { | |
192 | .verbose = IVSHMEM_SERVER_DEFAULT_VERBOSE, | |
193 | .foreground = IVSHMEM_SERVER_DEFAULT_FOREGROUND, | |
194 | .pid_file = IVSHMEM_SERVER_DEFAULT_PID_FILE, | |
195 | .unix_socket_path = IVSHMEM_SERVER_DEFAULT_UNIX_SOCK_PATH, | |
196 | .shm_path = IVSHMEM_SERVER_DEFAULT_SHM_PATH, | |
197 | .shm_size = IVSHMEM_SERVER_DEFAULT_SHM_SIZE, | |
198 | .n_vectors = IVSHMEM_SERVER_DEFAULT_N_VECTORS, | |
199 | }; | |
200 | int ret = 1; | |
201 | ||
202 | /* parse arguments, will exit on error */ | |
203 | ivshmem_server_parse_args(&args, argc, argv); | |
204 | ||
205 | /* Ignore SIGPIPE, see this link for more info: | |
206 | * http://www.mail-archive.com/libevent-users@monkey.org/msg01606.html */ | |
207 | sa.sa_handler = SIG_IGN; | |
208 | sa.sa_flags = 0; | |
209 | if (sigemptyset(&sa.sa_mask) == -1 || | |
210 | sigaction(SIGPIPE, &sa, 0) == -1) { | |
211 | perror("failed to ignore SIGPIPE; sigaction"); | |
212 | goto err; | |
213 | } | |
214 | ||
215 | sa_quit.sa_handler = ivshmem_server_quit_cb; | |
216 | sa_quit.sa_flags = 0; | |
217 | if (sigemptyset(&sa_quit.sa_mask) == -1 || | |
218 | sigaction(SIGTERM, &sa_quit, 0) == -1) { | |
219 | perror("failed to add SIGTERM handler; sigaction"); | |
220 | goto err; | |
221 | } | |
222 | ||
223 | /* init the ivshms structure */ | |
224 | if (ivshmem_server_init(&server, args.unix_socket_path, args.shm_path, | |
225 | args.shm_size, args.n_vectors, args.verbose) < 0) { | |
226 | fprintf(stderr, "cannot init server\n"); | |
227 | goto err; | |
228 | } | |
229 | ||
230 | /* start the ivshmem server (open shm & unix socket) */ | |
231 | if (ivshmem_server_start(&server) < 0) { | |
232 | fprintf(stderr, "cannot bind\n"); | |
233 | goto err; | |
234 | } | |
235 | ||
236 | /* daemonize if asked to */ | |
237 | if (!args.foreground) { | |
238 | FILE *fp; | |
239 | ||
240 | if (qemu_daemon(1, 1) < 0) { | |
241 | fprintf(stderr, "cannot daemonize: %s\n", strerror(errno)); | |
242 | goto err_close; | |
243 | } | |
244 | ||
245 | /* write pid file */ | |
246 | fp = fopen(args.pid_file, "w"); | |
247 | if (fp == NULL) { | |
248 | fprintf(stderr, "cannot write pid file: %s\n", strerror(errno)); | |
249 | goto err_close; | |
250 | } | |
251 | ||
252 | fprintf(fp, "%d\n", (int) getpid()); | |
253 | fclose(fp); | |
254 | } | |
255 | ||
256 | ivshmem_server_poll_events(&server); | |
257 | fprintf(stdout, "server disconnected\n"); | |
258 | ret = 0; | |
259 | ||
260 | err_close: | |
261 | ivshmem_server_close(&server); | |
262 | err: | |
263 | return ret; | |
264 | } |