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 } 265