Jes Sorensen | c1b0b93 | 2010-10-26 10:39:19 +0200 | [diff] [blame] | 1 | /* |
| 2 | * os-posix-lib.c |
| 3 | * |
| 4 | * Copyright (c) 2003-2008 Fabrice Bellard |
| 5 | * Copyright (c) 2010 Red Hat, Inc. |
| 6 | * |
| 7 | * QEMU library functions on POSIX which are shared between QEMU and |
| 8 | * the QEMU tools. |
| 9 | * |
| 10 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 11 | * of this software and associated documentation files (the "Software"), to deal |
| 12 | * in the Software without restriction, including without limitation the rights |
| 13 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 14 | * copies of the Software, and to permit persons to whom the Software is |
| 15 | * furnished to do so, subject to the following conditions: |
| 16 | * |
| 17 | * The above copyright notice and this permission notice shall be included in |
| 18 | * all copies or substantial portions of the Software. |
| 19 | * |
| 20 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 21 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 22 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 23 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 24 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 25 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| 26 | * THE SOFTWARE. |
| 27 | */ |
| 28 | |
Peter Maydell | aafd758 | 2016-01-29 17:49:55 +0000 | [diff] [blame] | 29 | #include "qemu/osdep.h" |
Stefan Hajnoczi | 13401ba | 2013-11-14 11:54:16 +0100 | [diff] [blame] | 30 | #include <termios.h> |
Stefan Hajnoczi | 13401ba | 2013-11-14 11:54:16 +0100 | [diff] [blame] | 31 | |
Laszlo Ersek | e2ea351 | 2013-05-18 06:31:48 +0200 | [diff] [blame] | 32 | #include <glib/gprintf.h> |
| 33 | |
Markus Armbruster | a8d2532 | 2019-05-23 16:35:08 +0200 | [diff] [blame] | 34 | #include "qemu-common.h" |
Paolo Bonzini | 9c17d61 | 2012-12-17 18:20:04 +0100 | [diff] [blame] | 35 | #include "sysemu/sysemu.h" |
Jes Sorensen | c1b0b93 | 2010-10-26 10:39:19 +0200 | [diff] [blame] | 36 | #include "trace.h" |
Markus Armbruster | da34e65 | 2016-03-14 09:01:28 +0100 | [diff] [blame] | 37 | #include "qapi/error.h" |
Paolo Bonzini | 1de7afc | 2012-12-17 18:20:00 +0100 | [diff] [blame] | 38 | #include "qemu/sockets.h" |
Fam Zheng | 10f5bff | 2014-02-10 14:48:51 +0800 | [diff] [blame] | 39 | #include <libgen.h> |
Paolo Bonzini | 3818331 | 2014-05-14 17:43:21 +0800 | [diff] [blame] | 40 | #include <sys/signal.h> |
Veronia Bahaa | f348b6d | 2016-03-20 19:16:19 +0200 | [diff] [blame] | 41 | #include "qemu/cutils.h" |
Jes Sorensen | c1b0b93 | 2010-10-26 10:39:19 +0200 | [diff] [blame] | 42 | |
Paolo Bonzini | cbcfa04 | 2011-09-12 16:20:11 +0200 | [diff] [blame] | 43 | #ifdef CONFIG_LINUX |
| 44 | #include <sys/syscall.h> |
| 45 | #endif |
Paolo Bonzini | cbcfa04 | 2011-09-12 16:20:11 +0200 | [diff] [blame] | 46 | |
Andreas Färber | 41975b2 | 2014-03-13 14:27:59 +0100 | [diff] [blame] | 47 | #ifdef __FreeBSD__ |
| 48 | #include <sys/sysctl.h> |
Ed Maste | a7764f1 | 2016-11-21 20:32:45 -0500 | [diff] [blame] | 49 | #include <sys/user.h> |
Michal Privoznik | 7dc9ae4 | 2016-09-27 17:24:56 +0200 | [diff] [blame] | 50 | #include <libutil.h> |
Andreas Färber | 41975b2 | 2014-03-13 14:27:59 +0100 | [diff] [blame] | 51 | #endif |
| 52 | |
Kamil Rytarowski | 094611b | 2017-10-28 21:48:33 +0200 | [diff] [blame] | 53 | #ifdef __NetBSD__ |
| 54 | #include <sys/sysctl.h> |
| 55 | #endif |
| 56 | |
Markus Armbruster | a9c9427 | 2016-06-22 19:11:19 +0200 | [diff] [blame] | 57 | #include "qemu/mmap-alloc.h" |
Michael S. Tsirkin | 794e8f3 | 2015-09-24 14:41:17 +0300 | [diff] [blame] | 58 | |
Peter Lieven | 7d992e4 | 2016-09-27 11:58:45 +0200 | [diff] [blame] | 59 | #ifdef CONFIG_DEBUG_STACK_USAGE |
| 60 | #include "qemu/error-report.h" |
| 61 | #endif |
| 62 | |
Jitendra Kolhe | dfd0dcc | 2017-03-21 02:50:06 -0400 | [diff] [blame] | 63 | #define MAX_MEM_PREALLOC_THREAD_COUNT 16 |
Jitendra Kolhe | 1e356fc | 2017-02-24 09:01:43 +0530 | [diff] [blame] | 64 | |
| 65 | struct MemsetThread { |
| 66 | char *addr; |
Stefan Weil | e947d47 | 2017-10-16 22:29:12 +0200 | [diff] [blame] | 67 | size_t numpages; |
| 68 | size_t hpagesize; |
Jitendra Kolhe | 1e356fc | 2017-02-24 09:01:43 +0530 | [diff] [blame] | 69 | QemuThread pgthread; |
| 70 | sigjmp_buf env; |
| 71 | }; |
| 72 | typedef struct MemsetThread MemsetThread; |
| 73 | |
| 74 | static MemsetThread *memset_thread; |
| 75 | static int memset_num_threads; |
| 76 | static bool memset_thread_failed; |
| 77 | |
Paolo Bonzini | cbcfa04 | 2011-09-12 16:20:11 +0200 | [diff] [blame] | 78 | int qemu_get_thread_id(void) |
| 79 | { |
| 80 | #if defined(__linux__) |
| 81 | return syscall(SYS_gettid); |
| 82 | #else |
| 83 | return getpid(); |
| 84 | #endif |
| 85 | } |
Alexandre Raymond | f97742d | 2011-06-06 23:34:10 -0400 | [diff] [blame] | 86 | |
| 87 | int qemu_daemon(int nochdir, int noclose) |
| 88 | { |
| 89 | return daemon(nochdir, noclose); |
| 90 | } |
| 91 | |
Marc-André Lureau | 9e6bdef | 2018-08-31 16:53:12 +0200 | [diff] [blame] | 92 | bool qemu_write_pidfile(const char *path, Error **errp) |
| 93 | { |
| 94 | int fd; |
| 95 | char pidstr[32]; |
| 96 | |
| 97 | while (1) { |
| 98 | struct stat a, b; |
Marc-André Lureau | 35f7f3f | 2018-08-31 16:53:13 +0200 | [diff] [blame] | 99 | struct flock lock = { |
| 100 | .l_type = F_WRLCK, |
| 101 | .l_whence = SEEK_SET, |
| 102 | .l_len = 0, |
| 103 | }; |
Marc-André Lureau | 9e6bdef | 2018-08-31 16:53:12 +0200 | [diff] [blame] | 104 | |
| 105 | fd = qemu_open(path, O_CREAT | O_WRONLY, S_IRUSR | S_IWUSR); |
| 106 | if (fd == -1) { |
| 107 | error_setg_errno(errp, errno, "Cannot open pid file"); |
| 108 | return false; |
| 109 | } |
| 110 | |
| 111 | if (fstat(fd, &b) < 0) { |
| 112 | error_setg_errno(errp, errno, "Cannot stat file"); |
| 113 | goto fail_close; |
| 114 | } |
| 115 | |
Marc-André Lureau | 35f7f3f | 2018-08-31 16:53:13 +0200 | [diff] [blame] | 116 | if (fcntl(fd, F_SETLK, &lock)) { |
Marc-André Lureau | 9e6bdef | 2018-08-31 16:53:12 +0200 | [diff] [blame] | 117 | error_setg_errno(errp, errno, "Cannot lock pid file"); |
| 118 | goto fail_close; |
| 119 | } |
| 120 | |
| 121 | /* |
| 122 | * Now make sure the path we locked is the same one that now |
| 123 | * exists on the filesystem. |
| 124 | */ |
| 125 | if (stat(path, &a) < 0) { |
| 126 | /* |
| 127 | * PID file disappeared, someone else must be racing with |
| 128 | * us, so try again. |
| 129 | */ |
| 130 | close(fd); |
| 131 | continue; |
| 132 | } |
| 133 | |
| 134 | if (a.st_ino == b.st_ino) { |
| 135 | break; |
| 136 | } |
| 137 | |
| 138 | /* |
| 139 | * PID file was recreated, someone else must be racing with |
| 140 | * us, so try again. |
| 141 | */ |
| 142 | close(fd); |
| 143 | } |
| 144 | |
| 145 | if (ftruncate(fd, 0) < 0) { |
| 146 | error_setg_errno(errp, errno, "Failed to truncate pid file"); |
| 147 | goto fail_unlink; |
| 148 | } |
| 149 | |
| 150 | snprintf(pidstr, sizeof(pidstr), FMT_pid "\n", getpid()); |
| 151 | if (write(fd, pidstr, strlen(pidstr)) != strlen(pidstr)) { |
| 152 | error_setg(errp, "Failed to write pid file"); |
| 153 | goto fail_unlink; |
| 154 | } |
| 155 | |
| 156 | return true; |
| 157 | |
| 158 | fail_unlink: |
| 159 | unlink(path); |
| 160 | fail_close: |
| 161 | close(fd); |
| 162 | return false; |
| 163 | } |
| 164 | |
Jes Sorensen | b152aa8 | 2010-10-26 10:39:26 +0200 | [diff] [blame] | 165 | void *qemu_oom_check(void *ptr) |
Jes Sorensen | c1b0b93 | 2010-10-26 10:39:19 +0200 | [diff] [blame] | 166 | { |
| 167 | if (ptr == NULL) { |
| 168 | fprintf(stderr, "Failed to allocate memory: %s\n", strerror(errno)); |
| 169 | abort(); |
| 170 | } |
| 171 | return ptr; |
| 172 | } |
Jes Sorensen | c1b0b93 | 2010-10-26 10:39:19 +0200 | [diff] [blame] | 173 | |
Kevin Wolf | 7d2a35c | 2014-05-20 12:24:05 +0200 | [diff] [blame] | 174 | void *qemu_try_memalign(size_t alignment, size_t size) |
Jes Sorensen | c1b0b93 | 2010-10-26 10:39:19 +0200 | [diff] [blame] | 175 | { |
| 176 | void *ptr; |
Kevin Wolf | e535465 | 2013-11-29 21:29:17 +0100 | [diff] [blame] | 177 | |
| 178 | if (alignment < sizeof(void*)) { |
| 179 | alignment = sizeof(void*); |
| 180 | } |
| 181 | |
Andreas Gustafsson | 9bc5a71 | 2018-01-04 19:39:36 +0200 | [diff] [blame] | 182 | #if defined(CONFIG_POSIX_MEMALIGN) |
Jes Sorensen | c1b0b93 | 2010-10-26 10:39:19 +0200 | [diff] [blame] | 183 | int ret; |
| 184 | ret = posix_memalign(&ptr, alignment, size); |
| 185 | if (ret != 0) { |
Kevin Wolf | 7d2a35c | 2014-05-20 12:24:05 +0200 | [diff] [blame] | 186 | errno = ret; |
| 187 | ptr = NULL; |
Jes Sorensen | c1b0b93 | 2010-10-26 10:39:19 +0200 | [diff] [blame] | 188 | } |
| 189 | #elif defined(CONFIG_BSD) |
Kevin Wolf | 7d2a35c | 2014-05-20 12:24:05 +0200 | [diff] [blame] | 190 | ptr = valloc(size); |
Jes Sorensen | c1b0b93 | 2010-10-26 10:39:19 +0200 | [diff] [blame] | 191 | #else |
Kevin Wolf | 7d2a35c | 2014-05-20 12:24:05 +0200 | [diff] [blame] | 192 | ptr = memalign(alignment, size); |
Jes Sorensen | c1b0b93 | 2010-10-26 10:39:19 +0200 | [diff] [blame] | 193 | #endif |
| 194 | trace_qemu_memalign(alignment, size, ptr); |
| 195 | return ptr; |
| 196 | } |
| 197 | |
Kevin Wolf | 7d2a35c | 2014-05-20 12:24:05 +0200 | [diff] [blame] | 198 | void *qemu_memalign(size_t alignment, size_t size) |
| 199 | { |
| 200 | return qemu_oom_check(qemu_try_memalign(alignment, size)); |
| 201 | } |
| 202 | |
Jes Sorensen | c1b0b93 | 2010-10-26 10:39:19 +0200 | [diff] [blame] | 203 | /* alloc shared memory pages */ |
Marcel Apfelbaum | 06329cc | 2017-12-13 16:37:37 +0200 | [diff] [blame] | 204 | void *qemu_anon_ram_alloc(size_t size, uint64_t *alignment, bool shared) |
Jes Sorensen | c1b0b93 | 2010-10-26 10:39:19 +0200 | [diff] [blame] | 205 | { |
Avi Kivity | 36b5862 | 2011-09-05 11:07:05 +0300 | [diff] [blame] | 206 | size_t align = QEMU_VMALLOC_ALIGN; |
Zhang Yi | 2ac0f16 | 2019-02-08 18:10:37 +0800 | [diff] [blame] | 207 | void *ptr = qemu_ram_mmap(-1, size, align, shared, false); |
Avi Kivity | 36b5862 | 2011-09-05 11:07:05 +0300 | [diff] [blame] | 208 | |
Paolo Bonzini | 7dda5dc | 2013-04-09 17:43:43 +0200 | [diff] [blame] | 209 | if (ptr == MAP_FAILED) { |
Markus Armbruster | 3922825 | 2013-07-31 15:11:11 +0200 | [diff] [blame] | 210 | return NULL; |
Stefan Weil | c2a8238 | 2011-10-31 21:29:46 +0100 | [diff] [blame] | 211 | } |
Stefan Weil | c2a8238 | 2011-10-31 21:29:46 +0100 | [diff] [blame] | 212 | |
Igor Mammedov | a2b257d | 2014-10-31 16:38:37 +0000 | [diff] [blame] | 213 | if (alignment) { |
| 214 | *alignment = align; |
| 215 | } |
Michael S. Tsirkin | c2dfc5b | 2015-09-10 16:36:51 +0300 | [diff] [blame] | 216 | |
Paolo Bonzini | 6eebf95 | 2013-05-13 16:19:55 +0200 | [diff] [blame] | 217 | trace_qemu_anon_ram_alloc(size, ptr); |
Jes Sorensen | c7f4111 | 2011-07-25 17:13:36 +0200 | [diff] [blame] | 218 | return ptr; |
Jes Sorensen | c1b0b93 | 2010-10-26 10:39:19 +0200 | [diff] [blame] | 219 | } |
| 220 | |
| 221 | void qemu_vfree(void *ptr) |
| 222 | { |
| 223 | trace_qemu_vfree(ptr); |
| 224 | free(ptr); |
| 225 | } |
Jes Sorensen | 9549e76 | 2010-10-26 10:39:20 +0200 | [diff] [blame] | 226 | |
Paolo Bonzini | e7a09b9 | 2013-05-13 16:19:56 +0200 | [diff] [blame] | 227 | void qemu_anon_ram_free(void *ptr, size_t size) |
| 228 | { |
| 229 | trace_qemu_anon_ram_free(ptr, size); |
Murilo Opsfelder Araujo | 53adb9d | 2019-01-30 21:36:05 -0200 | [diff] [blame] | 230 | qemu_ram_munmap(-1, ptr, size); |
Paolo Bonzini | e7a09b9 | 2013-05-13 16:19:56 +0200 | [diff] [blame] | 231 | } |
| 232 | |
Stefan Hajnoczi | f9e8cac | 2013-03-27 10:10:43 +0100 | [diff] [blame] | 233 | void qemu_set_block(int fd) |
Paolo Bonzini | 154b9a0 | 2011-10-05 09:17:32 +0200 | [diff] [blame] | 234 | { |
| 235 | int f; |
| 236 | f = fcntl(fd, F_GETFL); |
Li Qiang | da93b82 | 2018-12-15 04:03:53 -0800 | [diff] [blame] | 237 | assert(f != -1); |
| 238 | f = fcntl(fd, F_SETFL, f & ~O_NONBLOCK); |
| 239 | assert(f != -1); |
Paolo Bonzini | 154b9a0 | 2011-10-05 09:17:32 +0200 | [diff] [blame] | 240 | } |
| 241 | |
Stefan Hajnoczi | f9e8cac | 2013-03-27 10:10:43 +0100 | [diff] [blame] | 242 | void qemu_set_nonblock(int fd) |
Jes Sorensen | 9549e76 | 2010-10-26 10:39:20 +0200 | [diff] [blame] | 243 | { |
| 244 | int f; |
| 245 | f = fcntl(fd, F_GETFL); |
Li Qiang | da93b82 | 2018-12-15 04:03:53 -0800 | [diff] [blame] | 246 | assert(f != -1); |
| 247 | f = fcntl(fd, F_SETFL, f | O_NONBLOCK); |
Philippe Mathieu-Daudé | 02cdcc9 | 2019-03-07 15:28:21 +0100 | [diff] [blame] | 248 | #ifdef __OpenBSD__ |
| 249 | if (f == -1) { |
| 250 | /* |
| 251 | * Previous to OpenBSD 6.3, fcntl(F_SETFL) is not permitted on |
| 252 | * memory devices and sets errno to ENODEV. |
| 253 | * It's OK if we fail to set O_NONBLOCK on devices like /dev/null, |
| 254 | * because they will never block anyway. |
| 255 | */ |
| 256 | assert(errno == ENODEV); |
| 257 | } |
| 258 | #else |
Li Qiang | da93b82 | 2018-12-15 04:03:53 -0800 | [diff] [blame] | 259 | assert(f != -1); |
Philippe Mathieu-Daudé | 02cdcc9 | 2019-03-07 15:28:21 +0100 | [diff] [blame] | 260 | #endif |
Jes Sorensen | 9549e76 | 2010-10-26 10:39:20 +0200 | [diff] [blame] | 261 | } |
| 262 | |
Sebastian Ottlik | 606600a | 2013-10-02 12:23:12 +0200 | [diff] [blame] | 263 | int socket_set_fast_reuse(int fd) |
| 264 | { |
| 265 | int val = 1, ret; |
| 266 | |
| 267 | ret = setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, |
| 268 | (const char *)&val, sizeof(val)); |
| 269 | |
| 270 | assert(ret == 0); |
| 271 | |
| 272 | return ret; |
| 273 | } |
| 274 | |
Jes Sorensen | 9549e76 | 2010-10-26 10:39:20 +0200 | [diff] [blame] | 275 | void qemu_set_cloexec(int fd) |
| 276 | { |
| 277 | int f; |
| 278 | f = fcntl(fd, F_GETFD); |
Stefano Stabellini | 7e6478e | 2017-05-09 12:04:52 -0700 | [diff] [blame] | 279 | assert(f != -1); |
| 280 | f = fcntl(fd, F_SETFD, f | FD_CLOEXEC); |
| 281 | assert(f != -1); |
Jes Sorensen | 9549e76 | 2010-10-26 10:39:20 +0200 | [diff] [blame] | 282 | } |
Jes Sorensen | 70e72ce | 2010-10-26 10:39:21 +0200 | [diff] [blame] | 283 | |
| 284 | /* |
| 285 | * Creates a pipe with FD_CLOEXEC set on both file descriptors |
| 286 | */ |
| 287 | int qemu_pipe(int pipefd[2]) |
| 288 | { |
| 289 | int ret; |
| 290 | |
| 291 | #ifdef CONFIG_PIPE2 |
| 292 | ret = pipe2(pipefd, O_CLOEXEC); |
| 293 | if (ret != -1 || errno != ENOSYS) { |
| 294 | return ret; |
| 295 | } |
| 296 | #endif |
| 297 | ret = pipe(pipefd); |
| 298 | if (ret == 0) { |
| 299 | qemu_set_cloexec(pipefd[0]); |
| 300 | qemu_set_cloexec(pipefd[1]); |
| 301 | } |
| 302 | |
| 303 | return ret; |
| 304 | } |
Hidetoshi Seto | 3867142 | 2010-11-24 11:38:10 +0900 | [diff] [blame] | 305 | |
Laszlo Ersek | e2ea351 | 2013-05-18 06:31:48 +0200 | [diff] [blame] | 306 | char * |
| 307 | qemu_get_local_state_pathname(const char *relative_pathname) |
| 308 | { |
| 309 | return g_strdup_printf("%s/%s", CONFIG_QEMU_LOCALSTATEDIR, |
| 310 | relative_pathname); |
| 311 | } |
Stefan Hajnoczi | 13401ba | 2013-11-14 11:54:16 +0100 | [diff] [blame] | 312 | |
| 313 | void qemu_set_tty_echo(int fd, bool echo) |
| 314 | { |
| 315 | struct termios tty; |
| 316 | |
| 317 | tcgetattr(fd, &tty); |
| 318 | |
| 319 | if (echo) { |
| 320 | tty.c_lflag |= ECHO | ECHONL | ICANON | IEXTEN; |
| 321 | } else { |
| 322 | tty.c_lflag &= ~(ECHO | ECHONL | ICANON | IEXTEN); |
| 323 | } |
| 324 | |
| 325 | tcsetattr(fd, TCSANOW, &tty); |
| 326 | } |
Fam Zheng | 10f5bff | 2014-02-10 14:48:51 +0800 | [diff] [blame] | 327 | |
| 328 | static char exec_dir[PATH_MAX]; |
| 329 | |
| 330 | void qemu_init_exec_dir(const char *argv0) |
| 331 | { |
| 332 | char *dir; |
| 333 | char *p = NULL; |
| 334 | char buf[PATH_MAX]; |
| 335 | |
| 336 | assert(!exec_dir[0]); |
| 337 | |
| 338 | #if defined(__linux__) |
| 339 | { |
| 340 | int len; |
| 341 | len = readlink("/proc/self/exe", buf, sizeof(buf) - 1); |
| 342 | if (len > 0) { |
| 343 | buf[len] = 0; |
| 344 | p = buf; |
| 345 | } |
| 346 | } |
Kamil Rytarowski | 094611b | 2017-10-28 21:48:33 +0200 | [diff] [blame] | 347 | #elif defined(__FreeBSD__) \ |
| 348 | || (defined(__NetBSD__) && defined(KERN_PROC_PATHNAME)) |
Fam Zheng | 10f5bff | 2014-02-10 14:48:51 +0800 | [diff] [blame] | 349 | { |
Kamil Rytarowski | 094611b | 2017-10-28 21:48:33 +0200 | [diff] [blame] | 350 | #if defined(__FreeBSD__) |
Fam Zheng | 10f5bff | 2014-02-10 14:48:51 +0800 | [diff] [blame] | 351 | static int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1}; |
Kamil Rytarowski | 094611b | 2017-10-28 21:48:33 +0200 | [diff] [blame] | 352 | #else |
| 353 | static int mib[4] = {CTL_KERN, KERN_PROC_ARGS, -1, KERN_PROC_PATHNAME}; |
| 354 | #endif |
Fam Zheng | 10f5bff | 2014-02-10 14:48:51 +0800 | [diff] [blame] | 355 | size_t len = sizeof(buf) - 1; |
| 356 | |
| 357 | *buf = '\0'; |
| 358 | if (!sysctl(mib, ARRAY_SIZE(mib), buf, &len, NULL, 0) && |
| 359 | *buf) { |
| 360 | buf[sizeof(buf) - 1] = '\0'; |
| 361 | p = buf; |
| 362 | } |
| 363 | } |
| 364 | #endif |
| 365 | /* If we don't have any way of figuring out the actual executable |
| 366 | location then try argv[0]. */ |
| 367 | if (!p) { |
| 368 | if (!argv0) { |
| 369 | return; |
| 370 | } |
| 371 | p = realpath(argv0, buf); |
| 372 | if (!p) { |
| 373 | return; |
| 374 | } |
| 375 | } |
Wei Jiangang | 55ad781 | 2016-04-07 10:46:24 +0800 | [diff] [blame] | 376 | dir = g_path_get_dirname(p); |
Fam Zheng | 10f5bff | 2014-02-10 14:48:51 +0800 | [diff] [blame] | 377 | |
| 378 | pstrcpy(exec_dir, sizeof(exec_dir), dir); |
Wei Jiangang | 55ad781 | 2016-04-07 10:46:24 +0800 | [diff] [blame] | 379 | |
| 380 | g_free(dir); |
Fam Zheng | 10f5bff | 2014-02-10 14:48:51 +0800 | [diff] [blame] | 381 | } |
| 382 | |
| 383 | char *qemu_get_exec_dir(void) |
| 384 | { |
| 385 | return g_strdup(exec_dir); |
| 386 | } |
Paolo Bonzini | 3818331 | 2014-05-14 17:43:21 +0800 | [diff] [blame] | 387 | |
Paolo Bonzini | 3818331 | 2014-05-14 17:43:21 +0800 | [diff] [blame] | 388 | static void sigbus_handler(int signal) |
| 389 | { |
Jitendra Kolhe | 1e356fc | 2017-02-24 09:01:43 +0530 | [diff] [blame] | 390 | int i; |
| 391 | if (memset_thread) { |
| 392 | for (i = 0; i < memset_num_threads; i++) { |
| 393 | if (qemu_thread_is_self(&memset_thread[i].pgthread)) { |
| 394 | siglongjmp(memset_thread[i].env, 1); |
| 395 | } |
| 396 | } |
| 397 | } |
Paolo Bonzini | 3818331 | 2014-05-14 17:43:21 +0800 | [diff] [blame] | 398 | } |
| 399 | |
Jitendra Kolhe | 1e356fc | 2017-02-24 09:01:43 +0530 | [diff] [blame] | 400 | static void *do_touch_pages(void *arg) |
| 401 | { |
| 402 | MemsetThread *memset_args = (MemsetThread *)arg; |
Jitendra Kolhe | 1e356fc | 2017-02-24 09:01:43 +0530 | [diff] [blame] | 403 | sigset_t set, oldset; |
Jitendra Kolhe | 1e356fc | 2017-02-24 09:01:43 +0530 | [diff] [blame] | 404 | |
| 405 | /* unblock SIGBUS */ |
| 406 | sigemptyset(&set); |
| 407 | sigaddset(&set, SIGBUS); |
| 408 | pthread_sigmask(SIG_UNBLOCK, &set, &oldset); |
| 409 | |
| 410 | if (sigsetjmp(memset_args->env, 1)) { |
| 411 | memset_thread_failed = true; |
| 412 | } else { |
Stefan Weil | e947d47 | 2017-10-16 22:29:12 +0200 | [diff] [blame] | 413 | char *addr = memset_args->addr; |
| 414 | size_t numpages = memset_args->numpages; |
| 415 | size_t hpagesize = memset_args->hpagesize; |
| 416 | size_t i; |
Jitendra Kolhe | 1e356fc | 2017-02-24 09:01:43 +0530 | [diff] [blame] | 417 | for (i = 0; i < numpages; i++) { |
Daniel P. Berrange | 9dc44aa | 2017-03-03 11:32:55 +0000 | [diff] [blame] | 418 | /* |
| 419 | * Read & write back the same value, so we don't |
| 420 | * corrupt existing user/app data that might be |
| 421 | * stored. |
| 422 | * |
| 423 | * 'volatile' to stop compiler optimizing this away |
| 424 | * to a no-op |
| 425 | * |
| 426 | * TODO: get a better solution from kernel so we |
| 427 | * don't need to write at all so we don't cause |
| 428 | * wear on the storage backing the region... |
| 429 | */ |
| 430 | *(volatile char *)addr = *addr; |
Jitendra Kolhe | 1e356fc | 2017-02-24 09:01:43 +0530 | [diff] [blame] | 431 | addr += hpagesize; |
| 432 | } |
| 433 | } |
| 434 | pthread_sigmask(SIG_SETMASK, &oldset, NULL); |
| 435 | return NULL; |
| 436 | } |
| 437 | |
Jitendra Kolhe | dfd0dcc | 2017-03-21 02:50:06 -0400 | [diff] [blame] | 438 | static inline int get_memset_num_threads(int smp_cpus) |
| 439 | { |
| 440 | long host_procs = sysconf(_SC_NPROCESSORS_ONLN); |
| 441 | int ret = 1; |
| 442 | |
| 443 | if (host_procs > 0) { |
| 444 | ret = MIN(MIN(host_procs, MAX_MEM_PREALLOC_THREAD_COUNT), smp_cpus); |
| 445 | } |
| 446 | /* In case sysconf() fails, we fall back to single threaded */ |
| 447 | return ret; |
| 448 | } |
| 449 | |
Jitendra Kolhe | 1e356fc | 2017-02-24 09:01:43 +0530 | [diff] [blame] | 450 | static bool touch_all_pages(char *area, size_t hpagesize, size_t numpages, |
| 451 | int smp_cpus) |
| 452 | { |
Stefan Weil | e947d47 | 2017-10-16 22:29:12 +0200 | [diff] [blame] | 453 | size_t numpages_per_thread; |
| 454 | size_t size_per_thread; |
Jitendra Kolhe | 1e356fc | 2017-02-24 09:01:43 +0530 | [diff] [blame] | 455 | char *addr = area; |
| 456 | int i = 0; |
| 457 | |
| 458 | memset_thread_failed = false; |
Jitendra Kolhe | dfd0dcc | 2017-03-21 02:50:06 -0400 | [diff] [blame] | 459 | memset_num_threads = get_memset_num_threads(smp_cpus); |
Jitendra Kolhe | 1e356fc | 2017-02-24 09:01:43 +0530 | [diff] [blame] | 460 | memset_thread = g_new0(MemsetThread, memset_num_threads); |
| 461 | numpages_per_thread = (numpages / memset_num_threads); |
| 462 | size_per_thread = (hpagesize * numpages_per_thread); |
| 463 | for (i = 0; i < memset_num_threads; i++) { |
| 464 | memset_thread[i].addr = addr; |
| 465 | memset_thread[i].numpages = (i == (memset_num_threads - 1)) ? |
| 466 | numpages : numpages_per_thread; |
| 467 | memset_thread[i].hpagesize = hpagesize; |
| 468 | qemu_thread_create(&memset_thread[i].pgthread, "touch_pages", |
| 469 | do_touch_pages, &memset_thread[i], |
| 470 | QEMU_THREAD_JOINABLE); |
| 471 | addr += size_per_thread; |
| 472 | numpages -= numpages_per_thread; |
| 473 | } |
| 474 | for (i = 0; i < memset_num_threads; i++) { |
| 475 | qemu_thread_join(&memset_thread[i].pgthread); |
| 476 | } |
| 477 | g_free(memset_thread); |
| 478 | memset_thread = NULL; |
| 479 | |
| 480 | return memset_thread_failed; |
| 481 | } |
| 482 | |
| 483 | void os_mem_prealloc(int fd, char *area, size_t memory, int smp_cpus, |
| 484 | Error **errp) |
Paolo Bonzini | 3818331 | 2014-05-14 17:43:21 +0800 | [diff] [blame] | 485 | { |
Stefan Weil | b7bf8f5 | 2014-06-24 22:52:29 +0200 | [diff] [blame] | 486 | int ret; |
Paolo Bonzini | 3818331 | 2014-05-14 17:43:21 +0800 | [diff] [blame] | 487 | struct sigaction act, oldact; |
Jitendra Kolhe | 1e356fc | 2017-02-24 09:01:43 +0530 | [diff] [blame] | 488 | size_t hpagesize = qemu_fd_getpagesize(fd); |
| 489 | size_t numpages = DIV_ROUND_UP(memory, hpagesize); |
Paolo Bonzini | 3818331 | 2014-05-14 17:43:21 +0800 | [diff] [blame] | 490 | |
| 491 | memset(&act, 0, sizeof(act)); |
| 492 | act.sa_handler = &sigbus_handler; |
| 493 | act.sa_flags = 0; |
| 494 | |
| 495 | ret = sigaction(SIGBUS, &act, &oldact); |
| 496 | if (ret) { |
Igor Mammedov | 056b68a | 2016-07-20 11:54:03 +0200 | [diff] [blame] | 497 | error_setg_errno(errp, errno, |
| 498 | "os_mem_prealloc: failed to install signal handler"); |
| 499 | return; |
Paolo Bonzini | 3818331 | 2014-05-14 17:43:21 +0800 | [diff] [blame] | 500 | } |
| 501 | |
Jitendra Kolhe | 1e356fc | 2017-02-24 09:01:43 +0530 | [diff] [blame] | 502 | /* touch pages simultaneously */ |
| 503 | if (touch_all_pages(area, hpagesize, numpages, smp_cpus)) { |
Igor Mammedov | 056b68a | 2016-07-20 11:54:03 +0200 | [diff] [blame] | 504 | error_setg(errp, "os_mem_prealloc: Insufficient free host memory " |
Philippe Mathieu-Daudé | 462e5d5 | 2017-05-15 21:11:49 -0300 | [diff] [blame] | 505 | "pages available to allocate guest RAM"); |
Stefan Weil | b7bf8f5 | 2014-06-24 22:52:29 +0200 | [diff] [blame] | 506 | } |
Igor Mammedov | 056b68a | 2016-07-20 11:54:03 +0200 | [diff] [blame] | 507 | |
| 508 | ret = sigaction(SIGBUS, &oldact, NULL); |
| 509 | if (ret) { |
| 510 | /* Terminate QEMU since it can't recover from error */ |
| 511 | perror("os_mem_prealloc: failed to reinstall signal handler"); |
| 512 | exit(1); |
| 513 | } |
Paolo Bonzini | 3818331 | 2014-05-14 17:43:21 +0800 | [diff] [blame] | 514 | } |
Daniel P. Berrange | d57e4e4 | 2015-05-12 17:09:19 +0100 | [diff] [blame] | 515 | |
Stefan Hajnoczi | 314aec4 | 2019-02-14 11:10:04 +0800 | [diff] [blame] | 516 | uint64_t qemu_get_pmem_size(const char *filename, Error **errp) |
| 517 | { |
| 518 | struct stat st; |
| 519 | |
| 520 | if (stat(filename, &st) < 0) { |
| 521 | error_setg(errp, "unable to stat pmem file \"%s\"", filename); |
| 522 | return 0; |
| 523 | } |
| 524 | |
| 525 | #if defined(__linux__) |
| 526 | /* Special handling for devdax character devices */ |
| 527 | if (S_ISCHR(st.st_mode)) { |
| 528 | char *subsystem_path = NULL; |
| 529 | char *subsystem = NULL; |
| 530 | char *size_path = NULL; |
| 531 | char *size_str = NULL; |
| 532 | uint64_t ret = 0; |
| 533 | |
| 534 | subsystem_path = g_strdup_printf("/sys/dev/char/%d:%d/subsystem", |
| 535 | major(st.st_rdev), minor(st.st_rdev)); |
| 536 | subsystem = g_file_read_link(subsystem_path, NULL); |
| 537 | if (!subsystem) { |
| 538 | error_setg(errp, "unable to read subsystem for pmem file \"%s\"", |
| 539 | filename); |
| 540 | goto devdax_err; |
| 541 | } |
| 542 | |
| 543 | if (!g_str_has_suffix(subsystem, "/dax")) { |
| 544 | error_setg(errp, "pmem file \"%s\" is not a dax device", filename); |
| 545 | goto devdax_err; |
| 546 | } |
| 547 | |
| 548 | size_path = g_strdup_printf("/sys/dev/char/%d:%d/size", |
| 549 | major(st.st_rdev), minor(st.st_rdev)); |
| 550 | if (!g_file_get_contents(size_path, &size_str, NULL, NULL)) { |
| 551 | error_setg(errp, "unable to read size for pmem file \"%s\"", |
| 552 | size_path); |
| 553 | goto devdax_err; |
| 554 | } |
| 555 | |
| 556 | ret = g_ascii_strtoull(size_str, NULL, 0); |
| 557 | |
| 558 | devdax_err: |
| 559 | g_free(size_str); |
| 560 | g_free(size_path); |
| 561 | g_free(subsystem); |
| 562 | g_free(subsystem_path); |
| 563 | return ret; |
| 564 | } |
| 565 | #endif /* defined(__linux__) */ |
| 566 | |
| 567 | return st.st_size; |
| 568 | } |
Daniel P. Berrange | d57e4e4 | 2015-05-12 17:09:19 +0100 | [diff] [blame] | 569 | |
Michal Privoznik | 7dc9ae4 | 2016-09-27 17:24:56 +0200 | [diff] [blame] | 570 | char *qemu_get_pid_name(pid_t pid) |
| 571 | { |
| 572 | char *name = NULL; |
| 573 | |
| 574 | #if defined(__FreeBSD__) |
| 575 | /* BSDs don't have /proc, but they provide a nice substitute */ |
| 576 | struct kinfo_proc *proc = kinfo_getproc(pid); |
| 577 | |
| 578 | if (proc) { |
| 579 | name = g_strdup(proc->ki_comm); |
| 580 | free(proc); |
| 581 | } |
| 582 | #else |
| 583 | /* Assume a system with reasonable procfs */ |
| 584 | char *pid_path; |
| 585 | size_t len; |
| 586 | |
| 587 | pid_path = g_strdup_printf("/proc/%d/cmdline", pid); |
| 588 | g_file_get_contents(pid_path, &name, &len, NULL); |
| 589 | g_free(pid_path); |
| 590 | #endif |
| 591 | |
| 592 | return name; |
| 593 | } |
| 594 | |
| 595 | |
Daniel P. Berrange | 57cb38b | 2015-08-28 14:40:01 +0100 | [diff] [blame] | 596 | pid_t qemu_fork(Error **errp) |
| 597 | { |
| 598 | sigset_t oldmask, newmask; |
| 599 | struct sigaction sig_action; |
| 600 | int saved_errno; |
| 601 | pid_t pid; |
| 602 | |
| 603 | /* |
| 604 | * Need to block signals now, so that child process can safely |
| 605 | * kill off caller's signal handlers without a race. |
| 606 | */ |
| 607 | sigfillset(&newmask); |
| 608 | if (pthread_sigmask(SIG_SETMASK, &newmask, &oldmask) != 0) { |
| 609 | error_setg_errno(errp, errno, |
| 610 | "cannot block signals"); |
| 611 | return -1; |
| 612 | } |
| 613 | |
| 614 | pid = fork(); |
| 615 | saved_errno = errno; |
| 616 | |
| 617 | if (pid < 0) { |
| 618 | /* attempt to restore signal mask, but ignore failure, to |
| 619 | * avoid obscuring the fork failure */ |
| 620 | (void)pthread_sigmask(SIG_SETMASK, &oldmask, NULL); |
| 621 | error_setg_errno(errp, saved_errno, |
| 622 | "cannot fork child process"); |
| 623 | errno = saved_errno; |
| 624 | return -1; |
| 625 | } else if (pid) { |
| 626 | /* parent process */ |
| 627 | |
| 628 | /* Restore our original signal mask now that the child is |
| 629 | * safely running. Only documented failures are EFAULT (not |
| 630 | * possible, since we are using just-grabbed mask) or EINVAL |
| 631 | * (not possible, since we are using correct arguments). */ |
| 632 | (void)pthread_sigmask(SIG_SETMASK, &oldmask, NULL); |
| 633 | } else { |
| 634 | /* child process */ |
| 635 | size_t i; |
| 636 | |
| 637 | /* Clear out all signal handlers from parent so nothing |
| 638 | * unexpected can happen in our child once we unblock |
| 639 | * signals */ |
| 640 | sig_action.sa_handler = SIG_DFL; |
| 641 | sig_action.sa_flags = 0; |
| 642 | sigemptyset(&sig_action.sa_mask); |
| 643 | |
| 644 | for (i = 1; i < NSIG; i++) { |
| 645 | /* Only possible errors are EFAULT or EINVAL The former |
| 646 | * won't happen, the latter we expect, so no need to check |
| 647 | * return value */ |
| 648 | (void)sigaction(i, &sig_action, NULL); |
| 649 | } |
| 650 | |
| 651 | /* Unmask all signals in child, since we've no idea what the |
| 652 | * caller's done with their signal mask and don't want to |
| 653 | * propagate that to children */ |
| 654 | sigemptyset(&newmask); |
| 655 | if (pthread_sigmask(SIG_SETMASK, &newmask, NULL) != 0) { |
| 656 | Error *local_err = NULL; |
| 657 | error_setg_errno(&local_err, errno, |
| 658 | "cannot unblock signals"); |
| 659 | error_report_err(local_err); |
| 660 | _exit(1); |
| 661 | } |
| 662 | } |
| 663 | return pid; |
| 664 | } |
Peter Lieven | 8737d9e | 2016-09-27 11:58:40 +0200 | [diff] [blame] | 665 | |
| 666 | void *qemu_alloc_stack(size_t *sz) |
| 667 | { |
| 668 | void *ptr, *guardpage; |
Brad Smith | fc3d1ba | 2018-10-19 08:52:39 -0400 | [diff] [blame] | 669 | int flags; |
Peter Lieven | 7d992e4 | 2016-09-27 11:58:45 +0200 | [diff] [blame] | 670 | #ifdef CONFIG_DEBUG_STACK_USAGE |
| 671 | void *ptr2; |
| 672 | #endif |
Peter Lieven | 8737d9e | 2016-09-27 11:58:40 +0200 | [diff] [blame] | 673 | size_t pagesz = getpagesize(); |
| 674 | #ifdef _SC_THREAD_STACK_MIN |
| 675 | /* avoid stacks smaller than _SC_THREAD_STACK_MIN */ |
| 676 | long min_stack_sz = sysconf(_SC_THREAD_STACK_MIN); |
| 677 | *sz = MAX(MAX(min_stack_sz, 0), *sz); |
| 678 | #endif |
| 679 | /* adjust stack size to a multiple of the page size */ |
| 680 | *sz = ROUND_UP(*sz, pagesz); |
| 681 | /* allocate one extra page for the guard page */ |
| 682 | *sz += pagesz; |
| 683 | |
Brad Smith | fc3d1ba | 2018-10-19 08:52:39 -0400 | [diff] [blame] | 684 | flags = MAP_PRIVATE | MAP_ANONYMOUS; |
| 685 | #if defined(MAP_STACK) && defined(__OpenBSD__) |
| 686 | /* Only enable MAP_STACK on OpenBSD. Other OS's such as |
| 687 | * Linux/FreeBSD/NetBSD have a flag with the same name |
| 688 | * but have differing functionality. OpenBSD will SEGV |
| 689 | * if it spots execution with a stack pointer pointing |
| 690 | * at memory that was not allocated with MAP_STACK. |
| 691 | */ |
| 692 | flags |= MAP_STACK; |
| 693 | #endif |
| 694 | |
| 695 | ptr = mmap(NULL, *sz, PROT_READ | PROT_WRITE, flags, -1, 0); |
Peter Lieven | 8737d9e | 2016-09-27 11:58:40 +0200 | [diff] [blame] | 696 | if (ptr == MAP_FAILED) { |
Eduardo Habkost | e916a6e | 2017-08-29 18:20:53 -0300 | [diff] [blame] | 697 | perror("failed to allocate memory for stack"); |
Peter Lieven | 8737d9e | 2016-09-27 11:58:40 +0200 | [diff] [blame] | 698 | abort(); |
| 699 | } |
| 700 | |
| 701 | #if defined(HOST_IA64) |
| 702 | /* separate register stack */ |
| 703 | guardpage = ptr + (((*sz - pagesz) / 2) & ~pagesz); |
| 704 | #elif defined(HOST_HPPA) |
| 705 | /* stack grows up */ |
| 706 | guardpage = ptr + *sz - pagesz; |
| 707 | #else |
| 708 | /* stack grows down */ |
| 709 | guardpage = ptr; |
| 710 | #endif |
| 711 | if (mprotect(guardpage, pagesz, PROT_NONE) != 0) { |
Eduardo Habkost | e916a6e | 2017-08-29 18:20:53 -0300 | [diff] [blame] | 712 | perror("failed to set up stack guard page"); |
Peter Lieven | 8737d9e | 2016-09-27 11:58:40 +0200 | [diff] [blame] | 713 | abort(); |
| 714 | } |
| 715 | |
Peter Lieven | 7d992e4 | 2016-09-27 11:58:45 +0200 | [diff] [blame] | 716 | #ifdef CONFIG_DEBUG_STACK_USAGE |
| 717 | for (ptr2 = ptr + pagesz; ptr2 < ptr + *sz; ptr2 += sizeof(uint32_t)) { |
| 718 | *(uint32_t *)ptr2 = 0xdeadbeaf; |
| 719 | } |
| 720 | #endif |
| 721 | |
Peter Lieven | 8737d9e | 2016-09-27 11:58:40 +0200 | [diff] [blame] | 722 | return ptr; |
| 723 | } |
| 724 | |
Peter Lieven | 7d992e4 | 2016-09-27 11:58:45 +0200 | [diff] [blame] | 725 | #ifdef CONFIG_DEBUG_STACK_USAGE |
| 726 | static __thread unsigned int max_stack_usage; |
| 727 | #endif |
| 728 | |
Peter Lieven | 8737d9e | 2016-09-27 11:58:40 +0200 | [diff] [blame] | 729 | void qemu_free_stack(void *stack, size_t sz) |
| 730 | { |
Peter Lieven | 7d992e4 | 2016-09-27 11:58:45 +0200 | [diff] [blame] | 731 | #ifdef CONFIG_DEBUG_STACK_USAGE |
| 732 | unsigned int usage; |
| 733 | void *ptr; |
| 734 | |
| 735 | for (ptr = stack + getpagesize(); ptr < stack + sz; |
| 736 | ptr += sizeof(uint32_t)) { |
| 737 | if (*(uint32_t *)ptr != 0xdeadbeaf) { |
| 738 | break; |
| 739 | } |
| 740 | } |
| 741 | usage = sz - (uintptr_t) (ptr - stack); |
| 742 | if (usage > max_stack_usage) { |
| 743 | error_report("thread %d max stack usage increased from %u to %u", |
| 744 | qemu_get_thread_id(), max_stack_usage, usage); |
| 745 | max_stack_usage = usage; |
| 746 | } |
| 747 | #endif |
| 748 | |
Peter Lieven | 8737d9e | 2016-09-27 11:58:40 +0200 | [diff] [blame] | 749 | munmap(stack, sz); |
| 750 | } |
Paolo Bonzini | d98d407 | 2017-02-08 13:22:12 +0100 | [diff] [blame] | 751 | |
| 752 | void sigaction_invoke(struct sigaction *action, |
| 753 | struct qemu_signalfd_siginfo *info) |
| 754 | { |
Peter Maydell | 02ffa03 | 2017-07-20 17:32:21 +0100 | [diff] [blame] | 755 | siginfo_t si = {}; |
Paolo Bonzini | d98d407 | 2017-02-08 13:22:12 +0100 | [diff] [blame] | 756 | si.si_signo = info->ssi_signo; |
| 757 | si.si_errno = info->ssi_errno; |
| 758 | si.si_code = info->ssi_code; |
| 759 | |
| 760 | /* Convert the minimal set of fields defined by POSIX. |
| 761 | * Positive si_code values are reserved for kernel-generated |
| 762 | * signals, where the valid siginfo fields are determined by |
| 763 | * the signal number. But according to POSIX, it is unspecified |
| 764 | * whether SI_USER and SI_QUEUE have values less than or equal to |
| 765 | * zero. |
| 766 | */ |
| 767 | if (info->ssi_code == SI_USER || info->ssi_code == SI_QUEUE || |
| 768 | info->ssi_code <= 0) { |
| 769 | /* SIGTERM, etc. */ |
| 770 | si.si_pid = info->ssi_pid; |
| 771 | si.si_uid = info->ssi_uid; |
| 772 | } else if (info->ssi_signo == SIGILL || info->ssi_signo == SIGFPE || |
| 773 | info->ssi_signo == SIGSEGV || info->ssi_signo == SIGBUS) { |
| 774 | si.si_addr = (void *)(uintptr_t)info->ssi_addr; |
| 775 | } else if (info->ssi_signo == SIGCHLD) { |
| 776 | si.si_pid = info->ssi_pid; |
| 777 | si.si_status = info->ssi_status; |
| 778 | si.si_uid = info->ssi_uid; |
Paolo Bonzini | d98d407 | 2017-02-08 13:22:12 +0100 | [diff] [blame] | 779 | } |
| 780 | action->sa_sigaction(info->ssi_signo, &si, NULL); |
| 781 | } |