xen-vtx-unstable

annotate tools/xenstore/xs.c @ 6749:80afc502461b

Change xenbus_dev interface from ioctl to read/write.
Check boundaries so we can recover if userspace dies.
Also simplifies libxenstore.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Christian Limpach <Christian.Limpach@cl.cam.ac.uk>
author cl349@firebug.cl.cam.ac.uk
date Mon Sep 12 21:12:16 2005 +0000 (2005-09-12)
parents d4d69c509371
children d8637529daff
rev   line source
cl349@5357 1 /*
cl349@5357 2 Xen Store Daemon interface providing simple tree-like database.
cl349@5357 3 Copyright (C) 2005 Rusty Russell IBM Corporation
cl349@5357 4
kaf24@6008 5 This library is free software; you can redistribute it and/or
kaf24@6008 6 modify it under the terms of the GNU Lesser General Public
kaf24@6008 7 License as published by the Free Software Foundation; either
kaf24@6008 8 version 2.1 of the License, or (at your option) any later version.
cl349@5357 9
kaf24@6008 10 This library is distributed in the hope that it will be useful,
cl349@5357 11 but WITHOUT ANY WARRANTY; without even the implied warranty of
kaf24@6008 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
kaf24@6008 13 Lesser General Public License for more details.
cl349@5357 14
kaf24@6008 15 You should have received a copy of the GNU Lesser General Public
kaf24@6008 16 License along with this library; if not, write to the Free Software
kaf24@6008 17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
cl349@5357 18 */
cl349@5357 19
cl349@5357 20 #include <sys/types.h>
cl349@5357 21 #include <sys/stat.h>
cl349@5357 22 #include <fcntl.h>
cl349@5357 23 #include <sys/socket.h>
cl349@5357 24 #include <sys/un.h>
cl349@5357 25 #include <string.h>
cl349@5357 26 #include <unistd.h>
cl349@5357 27 #include <stdbool.h>
cl349@5357 28 #include <stdlib.h>
cl349@5357 29 #include <assert.h>
cl349@5357 30 #include <stdio.h>
cl349@5357 31 #include <signal.h>
cl349@5357 32 #include <stdint.h>
cl349@5357 33 #include <errno.h>
cl349@6601 34 #include <sys/ioctl.h>
cl349@5357 35 #include "xs.h"
cl349@5357 36 #include "xenstored.h"
cl349@5357 37 #include "xs_lib.h"
cl349@5357 38 #include "utils.h"
cl349@5357 39
cl349@5357 40 struct xs_handle
cl349@5357 41 {
cl349@5357 42 int fd;
cl349@5357 43 };
cl349@5357 44
cl349@5357 45 /* Get the socket from the store daemon handle.
cl349@5357 46 */
cl349@5357 47 int xs_fileno(struct xs_handle *h)
cl349@5357 48 {
cl349@5357 49 return h->fd;
cl349@5357 50 }
cl349@5357 51
cl349@5357 52 static struct xs_handle *get_socket(const char *connect_to)
cl349@5357 53 {
cl349@5357 54 struct sockaddr_un addr;
cl349@5357 55 int sock, saved_errno;
cl349@5357 56 struct xs_handle *h = NULL;
cl349@5357 57
cl349@5357 58 sock = socket(PF_UNIX, SOCK_STREAM, 0);
cl349@5357 59 if (sock < 0)
cl349@5357 60 return NULL;
cl349@5357 61
cl349@5357 62 addr.sun_family = AF_UNIX;
cl349@5357 63 strcpy(addr.sun_path, connect_to);
cl349@5357 64
cl349@5357 65 if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) == 0) {
cl349@5357 66 h = malloc(sizeof(*h));
cl349@5357 67 if (h) {
cl349@5357 68 h->fd = sock;
cl349@5357 69 return h;
cl349@5357 70 }
cl349@5357 71 }
cl349@5357 72
cl349@5357 73 saved_errno = errno;
cl349@5357 74 close(sock);
cl349@6601 75 errno = saved_errno;
cl349@6601 76 return NULL;
cl349@6601 77 }
cl349@6601 78
cl349@6601 79 static struct xs_handle *get_dev(const char *connect_to)
cl349@6601 80 {
cl349@6601 81 int fd, saved_errno;
cl349@6749 82 struct xs_handle *h;
cl349@6601 83
cl349@6749 84 fd = open(connect_to, O_RDWR);
cl349@6601 85 if (fd < 0)
cl349@6601 86 return NULL;
cl349@6601 87
cl349@6601 88 h = malloc(sizeof(*h));
cl349@6601 89 if (h) {
cl349@6601 90 h->fd = fd;
cl349@6601 91 return h;
cl349@6601 92 }
cl349@6601 93
cl349@6601 94 saved_errno = errno;
cl349@6601 95 close(fd);
cl349@5357 96 errno = saved_errno;
cl349@5357 97 return NULL;
cl349@5357 98 }
cl349@5357 99
cl349@5357 100 struct xs_handle *xs_daemon_open(void)
cl349@5357 101 {
cl349@5357 102 return get_socket(xs_daemon_socket());
cl349@5357 103 }
cl349@5357 104
cl349@5357 105 struct xs_handle *xs_daemon_open_readonly(void)
cl349@5357 106 {
cl349@5357 107 return get_socket(xs_daemon_socket_ro());
cl349@5357 108 }
cl349@5357 109
cl349@6601 110 struct xs_handle *xs_domain_open(void)
cl349@6601 111 {
cl349@6601 112 return get_dev(xs_domain_dev());
cl349@6601 113 }
cl349@6601 114
cl349@5357 115 void xs_daemon_close(struct xs_handle *h)
cl349@5357 116 {
cl349@5357 117 if (h->fd >= 0)
cl349@5357 118 close(h->fd);
cl349@5357 119 free(h);
cl349@5357 120 }
cl349@5357 121
cl349@5357 122 static bool read_all(int fd, void *data, unsigned int len)
cl349@5357 123 {
cl349@5357 124 while (len) {
cl349@5357 125 int done;
cl349@5357 126
cl349@5357 127 done = read(fd, data, len);
cl349@5357 128 if (done < 0) {
cl349@5357 129 if (errno == EINTR)
cl349@5357 130 continue;
cl349@5357 131 return false;
cl349@5357 132 }
cl349@5357 133 if (done == 0) {
cl349@5357 134 /* It closed fd on us? EBADF is appropriate. */
cl349@5357 135 errno = EBADF;
cl349@5357 136 return false;
cl349@5357 137 }
cl349@5357 138 data += done;
cl349@5357 139 len -= done;
cl349@5357 140 }
cl349@5357 141
cl349@5357 142 return true;
cl349@5357 143 }
cl349@5357 144
cl349@5357 145 #ifdef XSTEST
cl349@5357 146 #define read_all read_all_choice
kaf24@5423 147 #define xs_write_all write_all_choice
cl349@5357 148 #endif
cl349@5357 149
cl349@5357 150 static int get_error(const char *errorstring)
cl349@5357 151 {
cl349@5357 152 unsigned int i;
cl349@5357 153
cl349@5357 154 for (i = 0; !streq(errorstring, xsd_errors[i].errstring); i++)
cl349@5357 155 if (i == ARRAY_SIZE(xsd_errors) - 1)
cl349@5357 156 return EINVAL;
cl349@5357 157 return xsd_errors[i].errnum;
cl349@5357 158 }
cl349@5357 159
cl349@5522 160 /* Adds extra nul terminator, because we generally (always?) hold strings. */
cl349@5357 161 static void *read_reply(int fd, enum xsd_sockmsg_type *type, unsigned int *len)
cl349@5357 162 {
cl349@5357 163 struct xsd_sockmsg msg;
cl349@5357 164 void *ret;
cl349@5357 165 int saved_errno;
cl349@5357 166
cl349@5357 167 if (!read_all(fd, &msg, sizeof(msg)))
cl349@5357 168 return NULL;
cl349@5357 169
cl349@5522 170 ret = malloc(msg.len + 1);
cl349@5357 171 if (!ret)
cl349@5357 172 return NULL;
cl349@5357 173
cl349@5357 174 if (!read_all(fd, ret, msg.len)) {
cl349@5357 175 saved_errno = errno;
cl349@5357 176 free(ret);
cl349@5357 177 errno = saved_errno;
cl349@5357 178 return NULL;
cl349@5357 179 }
cl349@5357 180
cl349@5357 181 *type = msg.type;
cl349@5357 182 if (len)
cl349@5357 183 *len = msg.len;
cl349@5522 184 ((char *)ret)[msg.len] = '\0';
cl349@5357 185 return ret;
cl349@5357 186 }
cl349@5357 187
cl349@5357 188 /* Send message to xs, get malloc'ed reply. NULL and set errno on error. */
cl349@6749 189 static void *xs_talkv(struct xs_handle *h, enum xsd_sockmsg_type type,
cl349@6749 190 const struct iovec *iovec, unsigned int num_vecs,
cl349@6749 191 unsigned int *len)
cl349@5357 192 {
cl349@5357 193 struct xsd_sockmsg msg;
cl349@5357 194 void *ret = NULL;
cl349@5357 195 int saved_errno;
cl349@5357 196 unsigned int i;
cl349@5357 197 struct sigaction ignorepipe, oldact;
cl349@5357 198
cl349@5357 199 msg.type = type;
cl349@5357 200 msg.len = 0;
cl349@5357 201 for (i = 0; i < num_vecs; i++)
cl349@5357 202 msg.len += iovec[i].iov_len;
cl349@5357 203
cl349@5357 204 ignorepipe.sa_handler = SIG_IGN;
cl349@5357 205 sigemptyset(&ignorepipe.sa_mask);
cl349@5357 206 ignorepipe.sa_flags = 0;
cl349@5357 207 sigaction(SIGPIPE, &ignorepipe, &oldact);
cl349@5357 208
kaf24@5423 209 if (!xs_write_all(h->fd, &msg, sizeof(msg)))
cl349@5357 210 goto fail;
cl349@5357 211
cl349@5357 212 for (i = 0; i < num_vecs; i++)
kaf24@5423 213 if (!xs_write_all(h->fd, iovec[i].iov_base, iovec[i].iov_len))
cl349@5357 214 goto fail;
cl349@5357 215
cl349@5357 216 /* Watches can have fired before reply comes: daemon detects
cl349@5357 217 * and re-transmits, so we can ignore this. */
cl349@5357 218 do {
cl349@5357 219 free(ret);
cl349@5357 220 ret = read_reply(h->fd, &msg.type, len);
cl349@5357 221 if (!ret)
cl349@5357 222 goto fail;
cl349@5357 223 } while (msg.type == XS_WATCH_EVENT);
cl349@5357 224
cl349@5357 225 sigaction(SIGPIPE, &oldact, NULL);
cl349@5357 226 if (msg.type == XS_ERROR) {
cl349@5357 227 saved_errno = get_error(ret);
cl349@5357 228 free(ret);
cl349@5357 229 errno = saved_errno;
cl349@5357 230 return NULL;
cl349@5357 231 }
cl349@5357 232
kaf24@6043 233 if (msg.type != type) {
kaf24@6043 234 free(ret);
kaf24@6043 235 saved_errno = EBADF;
kaf24@6043 236 goto close_fd;
kaf24@6043 237
kaf24@6043 238 }
cl349@5357 239 return ret;
cl349@5357 240
cl349@5357 241 fail:
cl349@5357 242 /* We're in a bad state, so close fd. */
cl349@5357 243 saved_errno = errno;
cl349@5357 244 sigaction(SIGPIPE, &oldact, NULL);
kaf24@6043 245 close_fd:
cl349@5357 246 close(h->fd);
cl349@5357 247 h->fd = -1;
cl349@5357 248 errno = saved_errno;
cl349@5357 249 return NULL;
cl349@5357 250 }
cl349@5357 251
cl349@5357 252 /* free(), but don't change errno. */
cl349@5357 253 static void free_no_errno(void *p)
cl349@5357 254 {
cl349@5357 255 int saved_errno = errno;
cl349@5357 256 free(p);
cl349@5357 257 errno = saved_errno;
cl349@5357 258 }
cl349@5357 259
cl349@5357 260 /* Simplified version of xs_talkv: single message. */
cl349@5357 261 static void *xs_single(struct xs_handle *h, enum xsd_sockmsg_type type,
cl349@5357 262 const char *string, unsigned int *len)
cl349@5357 263 {
cl349@5357 264 struct iovec iovec;
cl349@5357 265
cl349@5357 266 iovec.iov_base = (void *)string;
cl349@5357 267 iovec.iov_len = strlen(string) + 1;
cl349@5357 268 return xs_talkv(h, type, &iovec, 1, len);
cl349@5357 269 }
cl349@5357 270
cl349@5357 271 static bool xs_bool(char *reply)
cl349@5357 272 {
cl349@5357 273 if (!reply)
cl349@5357 274 return false;
cl349@5357 275 free(reply);
cl349@5357 276 return true;
cl349@5357 277 }
cl349@5357 278
cl349@5357 279 char **xs_directory(struct xs_handle *h, const char *path, unsigned int *num)
cl349@5357 280 {
cl349@5357 281 char *strings, *p, **ret;
cl349@5357 282 unsigned int len;
cl349@5357 283
cl349@5357 284 strings = xs_single(h, XS_DIRECTORY, path, &len);
cl349@5357 285 if (!strings)
cl349@5357 286 return NULL;
cl349@5357 287
cl349@5357 288 /* Count the strings. */
kaf24@5423 289 *num = xs_count_strings(strings, len);
cl349@5357 290
cl349@5357 291 /* Transfer to one big alloc for easy freeing. */
cl349@5357 292 ret = malloc(*num * sizeof(char *) + len);
cl349@5357 293 if (!ret) {
cl349@5357 294 free_no_errno(strings);
cl349@5357 295 return NULL;
cl349@5357 296 }
cl349@5357 297 memcpy(&ret[*num], strings, len);
cl349@5357 298 free_no_errno(strings);
cl349@5357 299
cl349@5357 300 strings = (char *)&ret[*num];
cl349@5357 301 for (p = strings, *num = 0; p < strings + len; p += strlen(p) + 1)
cl349@5357 302 ret[(*num)++] = p;
cl349@5357 303 return ret;
cl349@5357 304 }
cl349@5357 305
cl349@5522 306 /* Get the value of a single file, nul terminated.
cl349@5357 307 * Returns a malloced value: call free() on it after use.
cl349@5522 308 * len indicates length in bytes, not including the nul.
cl349@5357 309 */
cl349@5357 310 void *xs_read(struct xs_handle *h, const char *path, unsigned int *len)
cl349@5357 311 {
cl349@5357 312 return xs_single(h, XS_READ, path, len);
cl349@5357 313 }
cl349@5357 314
cl349@5357 315 /* Write the value of a single file.
cl349@5357 316 * Returns false on failure. createflags can be 0, O_CREAT, or O_CREAT|O_EXCL.
cl349@5357 317 */
cl349@5357 318 bool xs_write(struct xs_handle *h, const char *path,
cl349@5357 319 const void *data, unsigned int len, int createflags)
cl349@5357 320 {
cl349@5357 321 const char *flags;
cl349@5357 322 struct iovec iovec[3];
cl349@5357 323
cl349@5357 324 /* Format: Flags (as string), path, data. */
cl349@5357 325 if (createflags == 0)
cl349@5357 326 flags = XS_WRITE_NONE;
cl349@5357 327 else if (createflags == O_CREAT)
cl349@5357 328 flags = XS_WRITE_CREATE;
cl349@5357 329 else if (createflags == (O_CREAT|O_EXCL))
cl349@5357 330 flags = XS_WRITE_CREATE_EXCL;
cl349@5357 331 else {
cl349@5357 332 errno = EINVAL;
cl349@5357 333 return false;
cl349@5357 334 }
cl349@5357 335
cl349@5357 336 iovec[0].iov_base = (void *)path;
cl349@5357 337 iovec[0].iov_len = strlen(path) + 1;
cl349@5357 338 iovec[1].iov_base = (void *)flags;
cl349@5357 339 iovec[1].iov_len = strlen(flags) + 1;
cl349@5357 340 iovec[2].iov_base = (void *)data;
cl349@5357 341 iovec[2].iov_len = len;
cl349@5357 342
cl349@5357 343 return xs_bool(xs_talkv(h, XS_WRITE, iovec, ARRAY_SIZE(iovec), NULL));
cl349@5357 344 }
cl349@5357 345
cl349@5357 346 /* Create a new directory.
cl349@5357 347 * Returns false on failure.
cl349@5357 348 */
cl349@5357 349 bool xs_mkdir(struct xs_handle *h, const char *path)
cl349@5357 350 {
cl349@5357 351 return xs_bool(xs_single(h, XS_MKDIR, path, NULL));
cl349@5357 352 }
cl349@5357 353
cl349@5357 354 /* Destroy a file or directory (directories must be empty).
cl349@5357 355 * Returns false on failure.
cl349@5357 356 */
cl349@5357 357 bool xs_rm(struct xs_handle *h, const char *path)
cl349@5357 358 {
cl349@5357 359 return xs_bool(xs_single(h, XS_RM, path, NULL));
cl349@5357 360 }
cl349@5357 361
cl349@5357 362 /* Get permissions of node (first element is owner).
cl349@5357 363 * Returns malloced array, or NULL: call free() after use.
cl349@5357 364 */
cl349@5357 365 struct xs_permissions *xs_get_permissions(struct xs_handle *h,
cl349@5478 366 const char *path, unsigned int *num)
cl349@5357 367 {
cl349@5357 368 char *strings;
cl349@5357 369 unsigned int len;
cl349@5357 370 struct xs_permissions *ret;
cl349@5357 371
cl349@5357 372 strings = xs_single(h, XS_GET_PERMS, path, &len);
cl349@5357 373 if (!strings)
cl349@5357 374 return NULL;
cl349@5357 375
cl349@5357 376 /* Count the strings: each one perms then domid. */
kaf24@5423 377 *num = xs_count_strings(strings, len);
cl349@5357 378
cl349@5357 379 /* Transfer to one big alloc for easy freeing. */
cl349@5357 380 ret = malloc(*num * sizeof(struct xs_permissions));
cl349@5357 381 if (!ret) {
cl349@5357 382 free_no_errno(strings);
cl349@5357 383 return NULL;
cl349@5357 384 }
cl349@5357 385
kaf24@5423 386 if (!xs_strings_to_perms(ret, *num, strings)) {
cl349@5357 387 free_no_errno(ret);
cl349@5357 388 ret = NULL;
cl349@5357 389 }
cl349@5357 390
cl349@5357 391 free(strings);
cl349@5357 392 return ret;
cl349@5357 393 }
cl349@5357 394
cl349@5357 395 /* Set permissions of node (must be owner).
cl349@5357 396 * Returns false on failure.
cl349@5357 397 */
cl349@5357 398 bool xs_set_permissions(struct xs_handle *h, const char *path,
cl349@5357 399 struct xs_permissions *perms,
cl349@5357 400 unsigned int num_perms)
cl349@5357 401 {
cl349@5357 402 unsigned int i;
cl349@5357 403 struct iovec iov[1+num_perms];
cl349@5357 404
cl349@5357 405 iov[0].iov_base = (void *)path;
cl349@5357 406 iov[0].iov_len = strlen(path) + 1;
cl349@5357 407
cl349@5357 408 for (i = 0; i < num_perms; i++) {
cl349@5357 409 char buffer[MAX_STRLEN(domid_t)+1];
cl349@5357 410
kaf24@5423 411 if (!xs_perm_to_string(&perms[i], buffer))
cl349@5357 412 goto unwind;
cl349@5357 413
cl349@5357 414 iov[i+1].iov_base = strdup(buffer);
cl349@5357 415 iov[i+1].iov_len = strlen(buffer) + 1;
cl349@5357 416 if (!iov[i+1].iov_base)
cl349@5357 417 goto unwind;
cl349@5357 418 }
cl349@5357 419
cl349@5357 420 if (!xs_bool(xs_talkv(h, XS_SET_PERMS, iov, 1+num_perms, NULL)))
cl349@5357 421 goto unwind;
cl349@5357 422 for (i = 0; i < num_perms; i++)
cl349@5357 423 free(iov[i+1].iov_base);
cl349@5357 424 return true;
cl349@5357 425
cl349@5357 426 unwind:
cl349@5357 427 num_perms = i;
cl349@5357 428 for (i = 0; i < num_perms; i++)
cl349@5357 429 free_no_errno(iov[i+1].iov_base);
cl349@5357 430 return false;
cl349@5357 431 }
cl349@5357 432
cl349@5357 433 /* Watch a node for changes (poll on fd to detect, or call read_watch()).
cl349@5357 434 * When the node (or any child) changes, fd will become readable.
cl349@5478 435 * Token is returned when watch is read, to allow matching.
cl349@5357 436 * Returns false on failure.
cl349@5357 437 */
cl349@5856 438 bool xs_watch(struct xs_handle *h, const char *path, const char *token)
cl349@5357 439 {
cl349@5856 440 struct iovec iov[2];
cl349@5357 441
cl349@5357 442 iov[0].iov_base = (void *)path;
cl349@5357 443 iov[0].iov_len = strlen(path) + 1;
cl349@5478 444 iov[1].iov_base = (void *)token;
cl349@5478 445 iov[1].iov_len = strlen(token) + 1;
cl349@5357 446
cl349@5357 447 return xs_bool(xs_talkv(h, XS_WATCH, iov, ARRAY_SIZE(iov), NULL));
cl349@5357 448 }
cl349@5357 449
cl349@5357 450 /* Find out what node change was on (will block if nothing pending).
cl349@5478 451 * Returns array of two pointers: path and token, or NULL.
cl349@5478 452 * Call free() after use.
cl349@5357 453 */
cl349@5478 454 char **xs_read_watch(struct xs_handle *h)
cl349@5357 455 {
cl349@5357 456 struct xsd_sockmsg msg;
cl349@5478 457 char **ret;
cl349@5357 458
cl349@5357 459 if (!read_all(h->fd, &msg, sizeof(msg)))
cl349@5357 460 return NULL;
cl349@5357 461
cl349@5357 462 assert(msg.type == XS_WATCH_EVENT);
cl349@5478 463 ret = malloc(sizeof(char *)*2 + msg.len);
cl349@5478 464 if (!ret)
cl349@5357 465 return NULL;
cl349@5357 466
cl349@5478 467 ret[0] = (char *)(ret + 2);
cl349@5478 468 if (!read_all(h->fd, ret[0], msg.len)) {
cl349@5478 469 free_no_errno(ret);
cl349@5357 470 return NULL;
cl349@5357 471 }
cl349@5478 472 ret[1] = ret[0] + strlen(ret[0]) + 1;
cl349@5478 473 return ret;
cl349@5357 474 }
cl349@5357 475
cl349@5357 476 /* Acknowledge watch on node. Watches must be acknowledged before
cl349@5357 477 * any other watches can be read.
cl349@5357 478 * Returns false on failure.
cl349@5357 479 */
cl349@5478 480 bool xs_acknowledge_watch(struct xs_handle *h, const char *token)
cl349@5357 481 {
cl349@5478 482 return xs_bool(xs_single(h, XS_WATCH_ACK, token, NULL));
cl349@5357 483 }
cl349@5357 484
cl349@5357 485 /* Remove a watch on a node.
cl349@5357 486 * Returns false on failure (no watch on that node).
cl349@5357 487 */
cl349@5478 488 bool xs_unwatch(struct xs_handle *h, const char *path, const char *token)
cl349@5357 489 {
cl349@5478 490 struct iovec iov[2];
cl349@5478 491
cl349@5478 492 iov[0].iov_base = (char *)path;
cl349@5478 493 iov[0].iov_len = strlen(path) + 1;
cl349@5478 494 iov[1].iov_base = (char *)token;
cl349@5478 495 iov[1].iov_len = strlen(token) + 1;
cl349@5478 496
cl349@5478 497 return xs_bool(xs_talkv(h, XS_UNWATCH, iov, ARRAY_SIZE(iov), NULL));
cl349@5357 498 }
cl349@5357 499
cl349@5357 500 /* Start a transaction: changes by others will not be seen during this
cl349@5357 501 * transaction, and changes will not be visible to others until end.
cl349@5357 502 * Transaction only applies to the given subtree.
cl349@5357 503 * You can only have one transaction at any time.
cl349@5357 504 * Returns false on failure.
cl349@5357 505 */
cl349@5357 506 bool xs_transaction_start(struct xs_handle *h, const char *subtree)
cl349@5357 507 {
cl349@5357 508 return xs_bool(xs_single(h, XS_TRANSACTION_START, subtree, NULL));
cl349@5357 509 }
cl349@5357 510
cl349@5357 511 /* End a transaction.
cl349@5357 512 * If abandon is true, transaction is discarded instead of committed.
cl349@5357 513 * Returns false on failure, which indicates an error: transactions will
cl349@5357 514 * not fail spuriously.
cl349@5357 515 */
cl349@5357 516 bool xs_transaction_end(struct xs_handle *h, bool abort)
cl349@5357 517 {
cl349@5357 518 char abortstr[2];
cl349@5357 519
cl349@5357 520 if (abort)
cl349@5357 521 strcpy(abortstr, "F");
cl349@5357 522 else
cl349@5357 523 strcpy(abortstr, "T");
cl349@5357 524 return xs_bool(xs_single(h, XS_TRANSACTION_END, abortstr, NULL));
cl349@5357 525 }
cl349@5357 526
cl349@5357 527 /* Introduce a new domain.
cl349@5357 528 * This tells the store daemon about a shared memory page and event channel
cl349@5357 529 * associated with a domain: the domain uses these to communicate.
cl349@5357 530 */
cl349@5478 531 bool xs_introduce_domain(struct xs_handle *h, domid_t domid, unsigned long mfn,
cl349@5478 532 unsigned int eventchn, const char *path)
cl349@5357 533 {
cl349@5357 534 char domid_str[MAX_STRLEN(domid)];
cl349@5357 535 char mfn_str[MAX_STRLEN(mfn)];
cl349@5357 536 char eventchn_str[MAX_STRLEN(eventchn)];
cl349@5357 537 struct iovec iov[4];
cl349@5357 538
cl349@5357 539 sprintf(domid_str, "%u", domid);
cl349@5357 540 sprintf(mfn_str, "%lu", mfn);
cl349@5357 541 sprintf(eventchn_str, "%u", eventchn);
cl349@5357 542
cl349@5357 543 iov[0].iov_base = domid_str;
cl349@5357 544 iov[0].iov_len = strlen(domid_str) + 1;
cl349@5357 545 iov[1].iov_base = mfn_str;
cl349@5357 546 iov[1].iov_len = strlen(mfn_str) + 1;
cl349@5357 547 iov[2].iov_base = eventchn_str;
cl349@5357 548 iov[2].iov_len = strlen(eventchn_str) + 1;
cl349@5357 549 iov[3].iov_base = (char *)path;
cl349@5357 550 iov[3].iov_len = strlen(path) + 1;
cl349@5357 551
cl349@5357 552 return xs_bool(xs_talkv(h, XS_INTRODUCE, iov, ARRAY_SIZE(iov), NULL));
cl349@5357 553 }
cl349@5357 554
cl349@5478 555 bool xs_release_domain(struct xs_handle *h, domid_t domid)
cl349@5357 556 {
cl349@5357 557 char domid_str[MAX_STRLEN(domid)];
cl349@5357 558
cl349@5357 559 sprintf(domid_str, "%u", domid);
cl349@5357 560
cl349@5357 561 return xs_bool(xs_single(h, XS_RELEASE, domid_str, NULL));
cl349@5357 562 }
cl349@5357 563
cl349@6625 564 char *xs_get_domain_path(struct xs_handle *h, domid_t domid)
cl349@6625 565 {
cl349@6625 566 char domid_str[MAX_STRLEN(domid)];
cl349@6625 567
cl349@6625 568 sprintf(domid_str, "%u", domid);
cl349@6625 569
cl349@6625 570 return xs_single(h, XS_GET_DOMAIN_PATH, domid_str, NULL);
cl349@6625 571 }
cl349@6625 572
cl349@5357 573 bool xs_shutdown(struct xs_handle *h)
cl349@5357 574 {
cl349@5357 575 bool ret = xs_bool(xs_single(h, XS_SHUTDOWN, "", NULL));
cl349@5357 576 if (ret) {
cl349@5357 577 char c;
cl349@5357 578 /* Wait for it to actually shutdown. */
kaf24@6636 579 while ((read(h->fd, &c, 1) < 0) && (errno == EINTR))
kaf24@6636 580 continue;
cl349@5357 581 }
cl349@5357 582 return ret;
cl349@5357 583 }
cl349@5357 584
cl349@5357 585 /* Only useful for DEBUG versions */
cl349@5357 586 char *xs_debug_command(struct xs_handle *h, const char *cmd,
cl349@5357 587 void *data, unsigned int len)
cl349@5357 588 {
cl349@5357 589 struct iovec iov[2];
cl349@5357 590
cl349@5357 591 iov[0].iov_base = (void *)cmd;
cl349@5357 592 iov[0].iov_len = strlen(cmd) + 1;
cl349@5357 593 iov[1].iov_base = data;
cl349@5357 594 iov[1].iov_len = len;
cl349@5357 595
cl349@5357 596 return xs_talkv(h, XS_DEBUG, iov, ARRAY_SIZE(iov), NULL);
cl349@5357 597 }