4 * Copyright (c) 2003-2008 Fabrice Bellard
5 * Copyright (c) 2010 Red Hat, Inc.
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:
14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
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
29 #include <sys/types.h>
31 /*needed for MAP_POPULATE before including qemu-options.h */
37 /* Needed early for CONFIG_BSD etc. */
38 #include "config-host.h"
39 #include "sysemu/sysemu.h"
40 #include "net/slirp.h"
41 #include "qemu-options.h"
45 #include <sys/prctl.h>
48 static struct passwd *user_pwd;
49 static const char *chroot_dir;
51 static int daemon_pipe;
53 void os_setup_early_signal_handling(void)
56 sigfillset(&act.sa_mask);
58 act.sa_handler = SIG_IGN;
59 sigaction(SIGPIPE, &act, NULL);
62 static void termsig_handler(int signal, siginfo_t *info, void *c)
64 qemu_system_killed(info->si_signo, info->si_pid);
67 void os_setup_signal_handling(void)
71 memset(&act, 0, sizeof(act));
72 act.sa_sigaction = termsig_handler;
73 act.sa_flags = SA_SIGINFO;
74 sigaction(SIGINT, &act, NULL);
75 sigaction(SIGHUP, &act, NULL);
76 sigaction(SIGTERM, &act, NULL);
79 /* Find a likely location for support files using the location of the binary.
80 For installed binaries this will be "$bindir/../share/qemu". When
81 running from the build tree this will be "$bindir/../pc-bios". */
82 #define SHARE_SUFFIX "/share/qemu"
83 #define BUILD_SUFFIX "/pc-bios"
84 char *os_find_datadir(void)
90 exec_dir = qemu_get_exec_dir();
91 if (exec_dir == NULL) {
94 dir = dirname(exec_dir);
96 max_len = strlen(dir) +
97 MAX(strlen(SHARE_SUFFIX), strlen(BUILD_SUFFIX)) + 1;
98 res = g_malloc0(max_len);
99 snprintf(res, max_len, "%s%s", dir, SHARE_SUFFIX);
100 if (access(res, R_OK)) {
101 snprintf(res, max_len, "%s%s", dir, BUILD_SUFFIX);
102 if (access(res, R_OK)) {
114 void os_set_proc_name(const char *s)
116 #if defined(PR_SET_NAME)
120 pstrcpy(name, sizeof(name), s);
121 /* Could rewrite argv[0] too, but that's a bit more complicated.
122 This simple way is enough for `top'. */
123 if (prctl(PR_SET_NAME, name)) {
124 perror("unable to change process name");
128 fprintf(stderr, "Change of process name not supported by your OS\n");
134 * Parse OS specific command line options.
135 * return 0 if option handled, -1 otherwise
137 void os_parse_cmd_args(int index, const char *optarg)
141 case QEMU_OPTION_smb:
142 if (net_slirp_smb(optarg) < 0)
146 case QEMU_OPTION_runas:
147 user_pwd = getpwnam(optarg);
149 fprintf(stderr, "User \"%s\" doesn't exist\n", optarg);
153 case QEMU_OPTION_chroot:
156 case QEMU_OPTION_daemonize:
159 #if defined(CONFIG_LINUX)
160 case QEMU_OPTION_enablefips:
161 fips_set_state(true);
167 static void change_process_uid(void)
170 if (setgid(user_pwd->pw_gid) < 0) {
171 fprintf(stderr, "Failed to setgid(%d)\n", user_pwd->pw_gid);
174 if (initgroups(user_pwd->pw_name, user_pwd->pw_gid) < 0) {
175 fprintf(stderr, "Failed to initgroups(\"%s\", %d)\n",
176 user_pwd->pw_name, user_pwd->pw_gid);
179 if (setuid(user_pwd->pw_uid) < 0) {
180 fprintf(stderr, "Failed to setuid(%d)\n", user_pwd->pw_uid);
183 if (setuid(0) != -1) {
184 fprintf(stderr, "Dropping privileges failed\n");
190 static void change_root(void)
193 if (chroot(chroot_dir) < 0) {
194 fprintf(stderr, "chroot failed\n");
198 perror("not able to chdir to /");
205 void os_daemonize(void)
211 if (pipe(fds) == -1) {
223 len = read(fds[0], &status, 1);
224 } while (len < 0 && errno == EINTR);
226 /* only exit successfully if our child actually wrote
227 * a one-byte zero to our pipe, upon successful init */
228 exit(len == 1 && status == 0 ? 0 : 1);
230 } else if (pid < 0) {
235 daemon_pipe = fds[1];
236 qemu_set_cloexec(daemon_pipe);
243 } else if (pid < 0) {
248 signal(SIGTSTP, SIG_IGN);
249 signal(SIGTTOU, SIG_IGN);
250 signal(SIGTTIN, SIG_IGN);
255 void os_setup_post(void)
261 perror("not able to chdir to /");
264 TFR(fd = qemu_open("/dev/null", O_RDWR));
271 change_process_uid();
284 len = write(daemon_pipe, &status, 1);
285 } while (len < 0 && errno == EINTR);
292 void os_set_line_buffering(void)
294 setvbuf(stdout, NULL, _IOLBF, 0);
297 int qemu_create_pidfile(const char *filename)
303 fd = qemu_open(filename, O_RDWR | O_CREAT, 0600);
307 if (lockf(fd, F_TLOCK, 0) == -1) {
311 len = snprintf(buffer, sizeof(buffer), FMT_pid "\n", getpid());
312 if (write(fd, buffer, len) != len) {
317 /* keep pidfile open & locked forever */
321 bool is_daemonized(void)
330 ret = mlockall(MCL_CURRENT | MCL_FUTURE);