Revision eb505be1 os-posix.c
| b/os-posix.c | ||
|---|---|---|
| 39 | 39 |
|
| 40 | 40 |
static struct passwd *user_pwd; |
| 41 | 41 |
static const char *chroot_dir; |
| 42 |
static int daemonize; |
|
| 43 |
static int fds[2]; |
|
| 42 | 44 |
|
| 43 | 45 |
void os_setup_early_signal_handling(void) |
| 44 | 46 |
{
|
| ... | ... | |
| 160 | 162 |
case QEMU_OPTION_chroot: |
| 161 | 163 |
chroot_dir = optarg; |
| 162 | 164 |
break; |
| 165 |
case QEMU_OPTION_daemonize: |
|
| 166 |
daemonize = 1; |
|
| 167 |
break; |
|
| 163 | 168 |
} |
| 164 | 169 |
return; |
| 165 | 170 |
} |
| ... | ... | |
| 196 | 201 |
} |
| 197 | 202 |
|
| 198 | 203 |
} |
| 204 |
|
|
| 205 |
void os_daemonize(void) |
|
| 206 |
{
|
|
| 207 |
if (daemonize) {
|
|
| 208 |
pid_t pid; |
|
| 209 |
|
|
| 210 |
if (pipe(fds) == -1) |
|
| 211 |
exit(1); |
|
| 212 |
|
|
| 213 |
pid = fork(); |
|
| 214 |
if (pid > 0) {
|
|
| 215 |
uint8_t status; |
|
| 216 |
ssize_t len; |
|
| 217 |
|
|
| 218 |
close(fds[1]); |
|
| 219 |
|
|
| 220 |
again: |
|
| 221 |
len = read(fds[0], &status, 1); |
|
| 222 |
if (len == -1 && (errno == EINTR)) |
|
| 223 |
goto again; |
|
| 224 |
|
|
| 225 |
if (len != 1) |
|
| 226 |
exit(1); |
|
| 227 |
else if (status == 1) {
|
|
| 228 |
fprintf(stderr, "Could not acquire pidfile: %s\n", strerror(errno)); |
|
| 229 |
exit(1); |
|
| 230 |
} else |
|
| 231 |
exit(0); |
|
| 232 |
} else if (pid < 0) |
|
| 233 |
exit(1); |
|
| 234 |
|
|
| 235 |
close(fds[0]); |
|
| 236 |
qemu_set_cloexec(fds[1]); |
|
| 237 |
|
|
| 238 |
setsid(); |
|
| 239 |
|
|
| 240 |
pid = fork(); |
|
| 241 |
if (pid > 0) |
|
| 242 |
exit(0); |
|
| 243 |
else if (pid < 0) |
|
| 244 |
exit(1); |
|
| 245 |
|
|
| 246 |
umask(027); |
|
| 247 |
|
|
| 248 |
signal(SIGTSTP, SIG_IGN); |
|
| 249 |
signal(SIGTTOU, SIG_IGN); |
|
| 250 |
signal(SIGTTIN, SIG_IGN); |
|
| 251 |
} |
|
| 252 |
} |
|
| 253 |
|
|
| 254 |
void os_setup_post(void) |
|
| 255 |
{
|
|
| 256 |
int fd = 0; |
|
| 257 |
|
|
| 258 |
if (daemonize) {
|
|
| 259 |
uint8_t status = 0; |
|
| 260 |
ssize_t len; |
|
| 261 |
|
|
| 262 |
again1: |
|
| 263 |
len = write(fds[1], &status, 1); |
|
| 264 |
if (len == -1 && (errno == EINTR)) |
|
| 265 |
goto again1; |
|
| 266 |
|
|
| 267 |
if (len != 1) |
|
| 268 |
exit(1); |
|
| 269 |
|
|
| 270 |
if (chdir("/")) {
|
|
| 271 |
perror("not able to chdir to /");
|
|
| 272 |
exit(1); |
|
| 273 |
} |
|
| 274 |
TFR(fd = qemu_open("/dev/null", O_RDWR));
|
|
| 275 |
if (fd == -1) |
|
| 276 |
exit(1); |
|
| 277 |
} |
|
| 278 |
|
|
| 279 |
os_change_root(); |
|
| 280 |
os_change_process_uid(); |
|
| 281 |
|
|
| 282 |
if (daemonize) {
|
|
| 283 |
dup2(fd, 0); |
|
| 284 |
dup2(fd, 1); |
|
| 285 |
dup2(fd, 2); |
|
| 286 |
|
|
| 287 |
close(fd); |
|
| 288 |
} |
|
| 289 |
} |
|
| 290 |
|
|
| 291 |
void os_pidfile_error(void) |
|
| 292 |
{
|
|
| 293 |
if (daemonize) {
|
|
| 294 |
uint8_t status = 1; |
|
| 295 |
if (write(fds[1], &status, 1) != 1) {
|
|
| 296 |
perror("daemonize. Writing to pipe\n");
|
|
| 297 |
} |
|
| 298 |
} else |
|
| 299 |
fprintf(stderr, "Could not acquire pid file: %s\n", strerror(errno)); |
|
| 300 |
} |
|
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