Jes Sorensen | 86b645e | 2010-06-10 11:42:19 +0200 | [diff] [blame] | 1 | /* |
| 2 | * os-posix.c |
| 3 | * |
| 4 | * Copyright (c) 2003-2008 Fabrice Bellard |
| 5 | * Copyright (c) 2010 Red Hat, Inc. |
| 6 | * |
| 7 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 8 | * of this software and associated documentation files (the "Software"), to deal |
| 9 | * in the Software without restriction, including without limitation the rights |
| 10 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 11 | * copies of the Software, and to permit persons to whom the Software is |
| 12 | * furnished to do so, subject to the following conditions: |
| 13 | * |
| 14 | * The above copyright notice and this permission notice shall be included in |
| 15 | * all copies or substantial portions of the Software. |
| 16 | * |
| 17 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 18 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 19 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 20 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 21 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 22 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| 23 | * THE SOFTWARE. |
| 24 | */ |
| 25 | |
Peter Maydell | d38ea87 | 2016-01-29 17:50:05 +0000 | [diff] [blame] | 26 | #include "qemu/osdep.h" |
Jes Sorensen | 8d963e6 | 2010-06-10 11:42:22 +0200 | [diff] [blame] | 27 | #include <sys/wait.h> |
Jes Sorensen | 8847cfe | 2010-06-10 11:42:26 +0200 | [diff] [blame] | 28 | #include <pwd.h> |
Stefan Hajnoczi | cc4662f | 2011-07-09 10:22:07 +0100 | [diff] [blame] | 29 | #include <grp.h> |
Jes Sorensen | 6170540 | 2010-06-10 11:42:23 +0200 | [diff] [blame] | 30 | #include <libgen.h> |
Jes Sorensen | 86b645e | 2010-06-10 11:42:19 +0200 | [diff] [blame] | 31 | |
| 32 | /* Needed early for CONFIG_BSD etc. */ |
Paolo Bonzini | 9c17d61 | 2012-12-17 18:20:04 +0100 | [diff] [blame] | 33 | #include "sysemu/sysemu.h" |
Jes Sorensen | 59a5264 | 2010-06-10 11:42:25 +0200 | [diff] [blame] | 34 | #include "net/slirp.h" |
| 35 | #include "qemu-options.h" |
Thomas Huth | f853ac6 | 2016-01-13 09:05:32 +0100 | [diff] [blame] | 36 | #include "qemu/error-report.h" |
Dimitris Aragiorgis | 96c33a4 | 2016-02-18 13:38:38 +0200 | [diff] [blame] | 37 | #include "qemu/log.h" |
Veronia Bahaa | f348b6d | 2016-03-20 19:16:19 +0200 | [diff] [blame] | 38 | #include "qemu/cutils.h" |
Jes Sorensen | 86b645e | 2010-06-10 11:42:19 +0200 | [diff] [blame] | 39 | |
Jes Sorensen | ce798cf | 2010-06-10 11:42:31 +0200 | [diff] [blame] | 40 | #ifdef CONFIG_LINUX |
| 41 | #include <sys/prctl.h> |
Jes Sorensen | 949d31e | 2010-10-26 10:39:22 +0200 | [diff] [blame] | 42 | #endif |
| 43 | |
Ian Jackson | 2c42f1e | 2017-09-15 18:10:44 +0100 | [diff] [blame] | 44 | /* |
| 45 | * Must set all three of these at once. |
| 46 | * Legal combinations are unset by name by uid |
| 47 | */ |
| 48 | static struct passwd *user_pwd; /* NULL non-NULL NULL */ |
| 49 | static uid_t user_uid = (uid_t)-1; /* -1 -1 >=0 */ |
| 50 | static gid_t user_gid = (gid_t)-1; /* -1 -1 >=0 */ |
| 51 | |
Jes Sorensen | 0766379 | 2010-06-10 11:42:27 +0200 | [diff] [blame] | 52 | static const char *chroot_dir; |
Jes Sorensen | eb505be | 2010-06-10 11:42:28 +0200 | [diff] [blame] | 53 | static int daemonize; |
Michael Tokarev | 0be5e43 | 2014-10-30 17:30:51 +0300 | [diff] [blame] | 54 | static int daemon_pipe; |
Jes Sorensen | 8847cfe | 2010-06-10 11:42:26 +0200 | [diff] [blame] | 55 | |
Jes Sorensen | fe98ac1 | 2010-06-10 11:42:21 +0200 | [diff] [blame] | 56 | void os_setup_early_signal_handling(void) |
Jes Sorensen | 86b645e | 2010-06-10 11:42:19 +0200 | [diff] [blame] | 57 | { |
| 58 | struct sigaction act; |
| 59 | sigfillset(&act.sa_mask); |
| 60 | act.sa_flags = 0; |
| 61 | act.sa_handler = SIG_IGN; |
| 62 | sigaction(SIGPIPE, &act, NULL); |
| 63 | } |
Jes Sorensen | 8d963e6 | 2010-06-10 11:42:22 +0200 | [diff] [blame] | 64 | |
Gleb Natapov | f64622c | 2011-03-15 13:56:04 +0200 | [diff] [blame] | 65 | static void termsig_handler(int signal, siginfo_t *info, void *c) |
Jes Sorensen | 8d963e6 | 2010-06-10 11:42:22 +0200 | [diff] [blame] | 66 | { |
Gleb Natapov | f64622c | 2011-03-15 13:56:04 +0200 | [diff] [blame] | 67 | qemu_system_killed(info->si_signo, info->si_pid); |
Jes Sorensen | 8d963e6 | 2010-06-10 11:42:22 +0200 | [diff] [blame] | 68 | } |
| 69 | |
Jes Sorensen | 8d963e6 | 2010-06-10 11:42:22 +0200 | [diff] [blame] | 70 | void os_setup_signal_handling(void) |
| 71 | { |
| 72 | struct sigaction act; |
| 73 | |
| 74 | memset(&act, 0, sizeof(act)); |
Gleb Natapov | f64622c | 2011-03-15 13:56:04 +0200 | [diff] [blame] | 75 | act.sa_sigaction = termsig_handler; |
| 76 | act.sa_flags = SA_SIGINFO; |
Jes Sorensen | 8d963e6 | 2010-06-10 11:42:22 +0200 | [diff] [blame] | 77 | sigaction(SIGINT, &act, NULL); |
| 78 | sigaction(SIGHUP, &act, NULL); |
| 79 | sigaction(SIGTERM, &act, NULL); |
Jes Sorensen | 8d963e6 | 2010-06-10 11:42:22 +0200 | [diff] [blame] | 80 | } |
Jes Sorensen | 6170540 | 2010-06-10 11:42:23 +0200 | [diff] [blame] | 81 | |
| 82 | /* Find a likely location for support files using the location of the binary. |
| 83 | For installed binaries this will be "$bindir/../share/qemu". When |
| 84 | running from the build tree this will be "$bindir/../pc-bios". */ |
| 85 | #define SHARE_SUFFIX "/share/qemu" |
| 86 | #define BUILD_SUFFIX "/pc-bios" |
Fam Zheng | 10f5bff | 2014-02-10 14:48:51 +0800 | [diff] [blame] | 87 | char *os_find_datadir(void) |
Jes Sorensen | 6170540 | 2010-06-10 11:42:23 +0200 | [diff] [blame] | 88 | { |
Fam Zheng | 10f5bff | 2014-02-10 14:48:51 +0800 | [diff] [blame] | 89 | char *dir, *exec_dir; |
Jes Sorensen | 6170540 | 2010-06-10 11:42:23 +0200 | [diff] [blame] | 90 | char *res; |
Jes Sorensen | 6170540 | 2010-06-10 11:42:23 +0200 | [diff] [blame] | 91 | size_t max_len; |
| 92 | |
Fam Zheng | 10f5bff | 2014-02-10 14:48:51 +0800 | [diff] [blame] | 93 | exec_dir = qemu_get_exec_dir(); |
| 94 | if (exec_dir == NULL) { |
| 95 | return NULL; |
Jes Sorensen | 6170540 | 2010-06-10 11:42:23 +0200 | [diff] [blame] | 96 | } |
Wei Jiangang | 55ad781 | 2016-04-07 10:46:24 +0800 | [diff] [blame] | 97 | dir = g_path_get_dirname(exec_dir); |
Jes Sorensen | 6170540 | 2010-06-10 11:42:23 +0200 | [diff] [blame] | 98 | |
| 99 | max_len = strlen(dir) + |
| 100 | MAX(strlen(SHARE_SUFFIX), strlen(BUILD_SUFFIX)) + 1; |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 101 | res = g_malloc0(max_len); |
Jes Sorensen | 6170540 | 2010-06-10 11:42:23 +0200 | [diff] [blame] | 102 | snprintf(res, max_len, "%s%s", dir, SHARE_SUFFIX); |
| 103 | if (access(res, R_OK)) { |
| 104 | snprintf(res, max_len, "%s%s", dir, BUILD_SUFFIX); |
| 105 | if (access(res, R_OK)) { |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 106 | g_free(res); |
Jes Sorensen | 6170540 | 2010-06-10 11:42:23 +0200 | [diff] [blame] | 107 | res = NULL; |
| 108 | } |
| 109 | } |
| 110 | |
Wei Jiangang | 55ad781 | 2016-04-07 10:46:24 +0800 | [diff] [blame] | 111 | g_free(dir); |
Fam Zheng | 10f5bff | 2014-02-10 14:48:51 +0800 | [diff] [blame] | 112 | g_free(exec_dir); |
Jes Sorensen | 6170540 | 2010-06-10 11:42:23 +0200 | [diff] [blame] | 113 | return res; |
| 114 | } |
| 115 | #undef SHARE_SUFFIX |
| 116 | #undef BUILD_SUFFIX |
Jes Sorensen | 59a5264 | 2010-06-10 11:42:25 +0200 | [diff] [blame] | 117 | |
Jes Sorensen | ce798cf | 2010-06-10 11:42:31 +0200 | [diff] [blame] | 118 | void os_set_proc_name(const char *s) |
| 119 | { |
| 120 | #if defined(PR_SET_NAME) |
| 121 | char name[16]; |
| 122 | if (!s) |
| 123 | return; |
Jim Meyering | 3eadc68 | 2012-10-04 13:09:51 +0200 | [diff] [blame] | 124 | pstrcpy(name, sizeof(name), s); |
Jes Sorensen | ce798cf | 2010-06-10 11:42:31 +0200 | [diff] [blame] | 125 | /* Could rewrite argv[0] too, but that's a bit more complicated. |
| 126 | This simple way is enough for `top'. */ |
| 127 | if (prctl(PR_SET_NAME, name)) { |
Ian Jackson | a7aaec1 | 2018-04-16 15:16:23 +0100 | [diff] [blame] | 128 | error_report("unable to change process name: %s", strerror(errno)); |
Jes Sorensen | ce798cf | 2010-06-10 11:42:31 +0200 | [diff] [blame] | 129 | exit(1); |
| 130 | } |
| 131 | #else |
Ian Jackson | 22cd4f4 | 2018-04-16 15:15:51 +0100 | [diff] [blame] | 132 | error_report("Change of process name not supported by your OS"); |
Jes Sorensen | ce798cf | 2010-06-10 11:42:31 +0200 | [diff] [blame] | 133 | exit(1); |
| 134 | #endif |
| 135 | } |
| 136 | |
Ian Jackson | 2c42f1e | 2017-09-15 18:10:44 +0100 | [diff] [blame] | 137 | |
| 138 | static bool os_parse_runas_uid_gid(const char *optarg) |
| 139 | { |
| 140 | unsigned long lv; |
| 141 | const char *ep; |
| 142 | uid_t got_uid; |
| 143 | gid_t got_gid; |
| 144 | int rc; |
| 145 | |
| 146 | rc = qemu_strtoul(optarg, &ep, 0, &lv); |
| 147 | got_uid = lv; /* overflow here is ID in C99 */ |
| 148 | if (rc || *ep != ':' || got_uid != lv || got_uid == (uid_t)-1) { |
| 149 | return false; |
| 150 | } |
| 151 | |
| 152 | rc = qemu_strtoul(ep + 1, 0, 0, &lv); |
| 153 | got_gid = lv; /* overflow here is ID in C99 */ |
| 154 | if (rc || got_gid != lv || got_gid == (gid_t)-1) { |
| 155 | return false; |
| 156 | } |
| 157 | |
| 158 | user_pwd = NULL; |
| 159 | user_uid = got_uid; |
| 160 | user_gid = got_gid; |
| 161 | return true; |
| 162 | } |
| 163 | |
Jes Sorensen | 59a5264 | 2010-06-10 11:42:25 +0200 | [diff] [blame] | 164 | /* |
| 165 | * Parse OS specific command line options. |
| 166 | * return 0 if option handled, -1 otherwise |
| 167 | */ |
Thomas Huth | 1217d6ca | 2018-05-04 19:01:07 +0200 | [diff] [blame] | 168 | int os_parse_cmd_args(int index, const char *optarg) |
Jes Sorensen | 59a5264 | 2010-06-10 11:42:25 +0200 | [diff] [blame] | 169 | { |
| 170 | switch (index) { |
| 171 | #ifdef CONFIG_SLIRP |
| 172 | case QEMU_OPTION_smb: |
Thomas Huth | f853ac6 | 2016-01-13 09:05:32 +0100 | [diff] [blame] | 173 | error_report("The -smb option is deprecated. " |
| 174 | "Please use '-netdev user,smb=...' instead."); |
Jes Sorensen | 59a5264 | 2010-06-10 11:42:25 +0200 | [diff] [blame] | 175 | if (net_slirp_smb(optarg) < 0) |
| 176 | exit(1); |
| 177 | break; |
| 178 | #endif |
Jes Sorensen | 8847cfe | 2010-06-10 11:42:26 +0200 | [diff] [blame] | 179 | case QEMU_OPTION_runas: |
| 180 | user_pwd = getpwnam(optarg); |
Ian Jackson | 2c42f1e | 2017-09-15 18:10:44 +0100 | [diff] [blame] | 181 | if (user_pwd) { |
| 182 | user_uid = -1; |
| 183 | user_gid = -1; |
| 184 | } else if (!os_parse_runas_uid_gid(optarg)) { |
| 185 | error_report("User \"%s\" doesn't exist" |
| 186 | " (and is not <uid>:<gid>)", |
| 187 | optarg); |
Jes Sorensen | 8847cfe | 2010-06-10 11:42:26 +0200 | [diff] [blame] | 188 | exit(1); |
| 189 | } |
| 190 | break; |
Jes Sorensen | 0766379 | 2010-06-10 11:42:27 +0200 | [diff] [blame] | 191 | case QEMU_OPTION_chroot: |
| 192 | chroot_dir = optarg; |
| 193 | break; |
Jes Sorensen | eb505be | 2010-06-10 11:42:28 +0200 | [diff] [blame] | 194 | case QEMU_OPTION_daemonize: |
| 195 | daemonize = 1; |
| 196 | break; |
Anthony Liguori | 70678b8 | 2012-08-03 18:28:37 -0500 | [diff] [blame] | 197 | #if defined(CONFIG_LINUX) |
| 198 | case QEMU_OPTION_enablefips: |
| 199 | fips_set_state(true); |
| 200 | break; |
| 201 | #endif |
Thomas Huth | 1217d6ca | 2018-05-04 19:01:07 +0200 | [diff] [blame] | 202 | default: |
| 203 | return -1; |
Jes Sorensen | 59a5264 | 2010-06-10 11:42:25 +0200 | [diff] [blame] | 204 | } |
Thomas Huth | 1217d6ca | 2018-05-04 19:01:07 +0200 | [diff] [blame] | 205 | |
| 206 | return 0; |
Jes Sorensen | 59a5264 | 2010-06-10 11:42:25 +0200 | [diff] [blame] | 207 | } |
Jes Sorensen | 8847cfe | 2010-06-10 11:42:26 +0200 | [diff] [blame] | 208 | |
Jes Sorensen | e06eb60 | 2010-06-10 11:42:29 +0200 | [diff] [blame] | 209 | static void change_process_uid(void) |
Jes Sorensen | 8847cfe | 2010-06-10 11:42:26 +0200 | [diff] [blame] | 210 | { |
Ian Jackson | 2c42f1e | 2017-09-15 18:10:44 +0100 | [diff] [blame] | 211 | assert((user_uid == (uid_t)-1) || user_pwd == NULL); |
| 212 | assert((user_uid == (uid_t)-1) == |
| 213 | (user_gid == (gid_t)-1)); |
| 214 | |
| 215 | if (user_pwd || user_uid != (uid_t)-1) { |
| 216 | gid_t intended_gid = user_pwd ? user_pwd->pw_gid : user_gid; |
| 217 | uid_t intended_uid = user_pwd ? user_pwd->pw_uid : user_uid; |
| 218 | if (setgid(intended_gid) < 0) { |
| 219 | error_report("Failed to setgid(%d)", intended_gid); |
Jes Sorensen | 8847cfe | 2010-06-10 11:42:26 +0200 | [diff] [blame] | 220 | exit(1); |
| 221 | } |
Ian Jackson | 2c42f1e | 2017-09-15 18:10:44 +0100 | [diff] [blame] | 222 | if (user_pwd) { |
| 223 | if (initgroups(user_pwd->pw_name, user_pwd->pw_gid) < 0) { |
| 224 | error_report("Failed to initgroups(\"%s\", %d)", |
| 225 | user_pwd->pw_name, user_pwd->pw_gid); |
| 226 | exit(1); |
| 227 | } |
| 228 | } else { |
| 229 | if (setgroups(1, &user_gid) < 0) { |
| 230 | error_report("Failed to setgroups(1, [%d])", |
| 231 | user_gid); |
| 232 | exit(1); |
| 233 | } |
Stefan Hajnoczi | cc4662f | 2011-07-09 10:22:07 +0100 | [diff] [blame] | 234 | } |
Ian Jackson | 2c42f1e | 2017-09-15 18:10:44 +0100 | [diff] [blame] | 235 | if (setuid(intended_uid) < 0) { |
| 236 | error_report("Failed to setuid(%d)", intended_uid); |
Jes Sorensen | 8847cfe | 2010-06-10 11:42:26 +0200 | [diff] [blame] | 237 | exit(1); |
| 238 | } |
| 239 | if (setuid(0) != -1) { |
Ian Jackson | f0a2171 | 2018-04-16 15:08:03 +0100 | [diff] [blame] | 240 | error_report("Dropping privileges failed"); |
Jes Sorensen | 8847cfe | 2010-06-10 11:42:26 +0200 | [diff] [blame] | 241 | exit(1); |
| 242 | } |
| 243 | } |
| 244 | } |
Jes Sorensen | 0766379 | 2010-06-10 11:42:27 +0200 | [diff] [blame] | 245 | |
Jes Sorensen | e06eb60 | 2010-06-10 11:42:29 +0200 | [diff] [blame] | 246 | static void change_root(void) |
Jes Sorensen | 0766379 | 2010-06-10 11:42:27 +0200 | [diff] [blame] | 247 | { |
| 248 | if (chroot_dir) { |
| 249 | if (chroot(chroot_dir) < 0) { |
Ian Jackson | 22cd4f4 | 2018-04-16 15:15:51 +0100 | [diff] [blame] | 250 | error_report("chroot failed"); |
Jes Sorensen | 0766379 | 2010-06-10 11:42:27 +0200 | [diff] [blame] | 251 | exit(1); |
| 252 | } |
| 253 | if (chdir("/")) { |
Ian Jackson | a7aaec1 | 2018-04-16 15:16:23 +0100 | [diff] [blame] | 254 | error_report("not able to chdir to /: %s", strerror(errno)); |
Jes Sorensen | 0766379 | 2010-06-10 11:42:27 +0200 | [diff] [blame] | 255 | exit(1); |
| 256 | } |
| 257 | } |
| 258 | |
| 259 | } |
Jes Sorensen | eb505be | 2010-06-10 11:42:28 +0200 | [diff] [blame] | 260 | |
| 261 | void os_daemonize(void) |
| 262 | { |
| 263 | if (daemonize) { |
Gonglei | 63ce8e1 | 2014-09-26 16:14:30 +0800 | [diff] [blame] | 264 | pid_t pid; |
Michael Tokarev | 0be5e43 | 2014-10-30 17:30:51 +0300 | [diff] [blame] | 265 | int fds[2]; |
Jes Sorensen | eb505be | 2010-06-10 11:42:28 +0200 | [diff] [blame] | 266 | |
Gonglei | 63ce8e1 | 2014-09-26 16:14:30 +0800 | [diff] [blame] | 267 | if (pipe(fds) == -1) { |
| 268 | exit(1); |
| 269 | } |
Jes Sorensen | eb505be | 2010-06-10 11:42:28 +0200 | [diff] [blame] | 270 | |
Gonglei | 63ce8e1 | 2014-09-26 16:14:30 +0800 | [diff] [blame] | 271 | pid = fork(); |
| 272 | if (pid > 0) { |
| 273 | uint8_t status; |
| 274 | ssize_t len; |
Jes Sorensen | eb505be | 2010-06-10 11:42:28 +0200 | [diff] [blame] | 275 | |
Gonglei | 63ce8e1 | 2014-09-26 16:14:30 +0800 | [diff] [blame] | 276 | close(fds[1]); |
Jes Sorensen | eb505be | 2010-06-10 11:42:28 +0200 | [diff] [blame] | 277 | |
Michael Tokarev | ccea25f | 2014-10-30 17:37:16 +0300 | [diff] [blame] | 278 | do { |
| 279 | len = read(fds[0], &status, 1); |
| 280 | } while (len < 0 && errno == EINTR); |
Michael Tokarev | fee78fd | 2014-10-30 17:40:48 +0300 | [diff] [blame] | 281 | |
| 282 | /* only exit successfully if our child actually wrote |
| 283 | * a one-byte zero to our pipe, upon successful init */ |
| 284 | exit(len == 1 && status == 0 ? 0 : 1); |
| 285 | |
| 286 | } else if (pid < 0) { |
| 287 | exit(1); |
| 288 | } |
Gonglei | 63ce8e1 | 2014-09-26 16:14:30 +0800 | [diff] [blame] | 289 | |
| 290 | close(fds[0]); |
Michael Tokarev | 0be5e43 | 2014-10-30 17:30:51 +0300 | [diff] [blame] | 291 | daemon_pipe = fds[1]; |
| 292 | qemu_set_cloexec(daemon_pipe); |
Gonglei | 63ce8e1 | 2014-09-26 16:14:30 +0800 | [diff] [blame] | 293 | |
| 294 | setsid(); |
| 295 | |
| 296 | pid = fork(); |
| 297 | if (pid > 0) { |
| 298 | exit(0); |
| 299 | } else if (pid < 0) { |
Jes Sorensen | eb505be | 2010-06-10 11:42:28 +0200 | [diff] [blame] | 300 | exit(1); |
Gonglei | 63ce8e1 | 2014-09-26 16:14:30 +0800 | [diff] [blame] | 301 | } |
| 302 | umask(027); |
Jes Sorensen | eb505be | 2010-06-10 11:42:28 +0200 | [diff] [blame] | 303 | |
| 304 | signal(SIGTSTP, SIG_IGN); |
| 305 | signal(SIGTTOU, SIG_IGN); |
| 306 | signal(SIGTTIN, SIG_IGN); |
| 307 | } |
| 308 | } |
| 309 | |
| 310 | void os_setup_post(void) |
| 311 | { |
| 312 | int fd = 0; |
| 313 | |
| 314 | if (daemonize) { |
Jes Sorensen | eb505be | 2010-06-10 11:42:28 +0200 | [diff] [blame] | 315 | if (chdir("/")) { |
Ian Jackson | a7aaec1 | 2018-04-16 15:16:23 +0100 | [diff] [blame] | 316 | error_report("not able to chdir to /: %s", strerror(errno)); |
Jes Sorensen | eb505be | 2010-06-10 11:42:28 +0200 | [diff] [blame] | 317 | exit(1); |
| 318 | } |
Gonglei | 63ce8e1 | 2014-09-26 16:14:30 +0800 | [diff] [blame] | 319 | TFR(fd = qemu_open("/dev/null", O_RDWR)); |
| 320 | if (fd == -1) { |
| 321 | exit(1); |
| 322 | } |
Jes Sorensen | eb505be | 2010-06-10 11:42:28 +0200 | [diff] [blame] | 323 | } |
| 324 | |
Jes Sorensen | e06eb60 | 2010-06-10 11:42:29 +0200 | [diff] [blame] | 325 | change_root(); |
| 326 | change_process_uid(); |
Jes Sorensen | eb505be | 2010-06-10 11:42:28 +0200 | [diff] [blame] | 327 | |
| 328 | if (daemonize) { |
Michael Tokarev | 25cec2b | 2014-10-30 17:47:46 +0300 | [diff] [blame] | 329 | uint8_t status = 0; |
| 330 | ssize_t len; |
| 331 | |
Jes Sorensen | eb505be | 2010-06-10 11:42:28 +0200 | [diff] [blame] | 332 | dup2(fd, 0); |
| 333 | dup2(fd, 1); |
Dimitris Aragiorgis | 96c33a4 | 2016-02-18 13:38:38 +0200 | [diff] [blame] | 334 | /* In case -D is given do not redirect stderr to /dev/null */ |
| 335 | if (!qemu_logfile) { |
| 336 | dup2(fd, 2); |
| 337 | } |
Jes Sorensen | eb505be | 2010-06-10 11:42:28 +0200 | [diff] [blame] | 338 | |
| 339 | close(fd); |
Michael Tokarev | 25cec2b | 2014-10-30 17:47:46 +0300 | [diff] [blame] | 340 | |
| 341 | do { |
| 342 | len = write(daemon_pipe, &status, 1); |
| 343 | } while (len < 0 && errno == EINTR); |
| 344 | if (len != 1) { |
| 345 | exit(1); |
| 346 | } |
Jes Sorensen | eb505be | 2010-06-10 11:42:28 +0200 | [diff] [blame] | 347 | } |
| 348 | } |
| 349 | |
Jes Sorensen | 9156d76 | 2010-06-10 11:42:30 +0200 | [diff] [blame] | 350 | void os_set_line_buffering(void) |
| 351 | { |
| 352 | setvbuf(stdout, NULL, _IOLBF, 0); |
| 353 | } |
Jes Sorensen | 949d31e | 2010-10-26 10:39:22 +0200 | [diff] [blame] | 354 | |
Jes Sorensen | bc4a957 | 2010-10-26 10:39:25 +0200 | [diff] [blame] | 355 | int qemu_create_pidfile(const char *filename) |
| 356 | { |
| 357 | char buffer[128]; |
| 358 | int len; |
| 359 | int fd; |
| 360 | |
| 361 | fd = qemu_open(filename, O_RDWR | O_CREAT, 0600); |
| 362 | if (fd == -1) { |
| 363 | return -1; |
| 364 | } |
| 365 | if (lockf(fd, F_TLOCK, 0) == -1) { |
Markus Armbruster | 1bbd159 | 2011-11-11 10:40:09 +0100 | [diff] [blame] | 366 | close(fd); |
Jes Sorensen | bc4a957 | 2010-10-26 10:39:25 +0200 | [diff] [blame] | 367 | return -1; |
| 368 | } |
Andreas Färber | 953ffe0 | 2011-06-02 19:58:06 +0200 | [diff] [blame] | 369 | len = snprintf(buffer, sizeof(buffer), FMT_pid "\n", getpid()); |
Jes Sorensen | bc4a957 | 2010-10-26 10:39:25 +0200 | [diff] [blame] | 370 | if (write(fd, buffer, len) != len) { |
Markus Armbruster | 1bbd159 | 2011-11-11 10:40:09 +0100 | [diff] [blame] | 371 | close(fd); |
Jes Sorensen | bc4a957 | 2010-10-26 10:39:25 +0200 | [diff] [blame] | 372 | return -1; |
| 373 | } |
| 374 | |
Laszlo Ersek | 93dd748 | 2012-01-27 14:34:05 +0100 | [diff] [blame] | 375 | /* keep pidfile open & locked forever */ |
Jes Sorensen | bc4a957 | 2010-10-26 10:39:25 +0200 | [diff] [blame] | 376 | return 0; |
| 377 | } |
Hitoshi Mitake | 995ee2b | 2012-09-15 01:15:41 +0900 | [diff] [blame] | 378 | |
| 379 | bool is_daemonized(void) |
| 380 | { |
| 381 | return daemonize; |
| 382 | } |
Satoru Moriya | 888a6bc | 2013-04-19 16:42:06 +0200 | [diff] [blame] | 383 | |
| 384 | int os_mlock(void) |
| 385 | { |
| 386 | int ret = 0; |
| 387 | |
| 388 | ret = mlockall(MCL_CURRENT | MCL_FUTURE); |
| 389 | if (ret < 0) { |
Ian Jackson | a7aaec1 | 2018-04-16 15:16:23 +0100 | [diff] [blame] | 390 | error_report("mlockall: %s", strerror(errno)); |
Satoru Moriya | 888a6bc | 2013-04-19 16:42:06 +0200 | [diff] [blame] | 391 | } |
| 392 | |
| 393 | return ret; |
| 394 | } |