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>
34 /* Needed early for CONFIG_BSD etc. */
35 #include "config-host.h"
37 #include "net/slirp.h"
38 #include "qemu-options.h"
40 static struct passwd
*user_pwd
;
41 static const char *chroot_dir
;
45 void os_setup_early_signal_handling(void)
48 sigfillset(&act
.sa_mask
);
50 act
.sa_handler
= SIG_IGN
;
51 sigaction(SIGPIPE
, &act
, NULL
);
54 static void termsig_handler(int signal
)
56 qemu_system_shutdown_request();
59 static void sigchld_handler(int signal
)
61 waitpid(-1, NULL
, WNOHANG
);
64 void os_setup_signal_handling(void)
68 memset(&act
, 0, sizeof(act
));
69 act
.sa_handler
= termsig_handler
;
70 sigaction(SIGINT
, &act
, NULL
);
71 sigaction(SIGHUP
, &act
, NULL
);
72 sigaction(SIGTERM
, &act
, NULL
);
74 act
.sa_handler
= sigchld_handler
;
75 act
.sa_flags
= SA_NOCLDSTOP
;
76 sigaction(SIGCHLD
, &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(const char *argv0
)
92 #if defined(__linux__)
95 len
= readlink("/proc/self/exe", buf
, sizeof(buf
) - 1);
101 #elif defined(__FreeBSD__)
103 static int mib
[4] = {CTL_KERN
, KERN_PROC
, KERN_PROC_PATHNAME
, -1};
104 size_t len
= sizeof(buf
) - 1;
107 if (!sysctl(mib
, sizeof(mib
)/sizeof(*mib
), buf
, &len
, NULL
, 0) &&
109 buf
[sizeof(buf
) - 1] = '\0';
114 /* If we don't have any way of figuring out the actual executable
115 location then try argv[0]. */
117 p
= realpath(argv0
, buf
);
125 max_len
= strlen(dir
) +
126 MAX(strlen(SHARE_SUFFIX
), strlen(BUILD_SUFFIX
)) + 1;
127 res
= qemu_mallocz(max_len
);
128 snprintf(res
, max_len
, "%s%s", dir
, SHARE_SUFFIX
);
129 if (access(res
, R_OK
)) {
130 snprintf(res
, max_len
, "%s%s", dir
, BUILD_SUFFIX
);
131 if (access(res
, R_OK
)) {
143 * Parse OS specific command line options.
144 * return 0 if option handled, -1 otherwise
146 void os_parse_cmd_args(int index
, const char *optarg
)
150 case QEMU_OPTION_smb
:
151 if (net_slirp_smb(optarg
) < 0)
155 case QEMU_OPTION_runas
:
156 user_pwd
= getpwnam(optarg
);
158 fprintf(stderr
, "User \"%s\" doesn't exist\n", optarg
);
162 case QEMU_OPTION_chroot
:
165 case QEMU_OPTION_daemonize
:
172 static void change_process_uid(void)
175 if (setgid(user_pwd
->pw_gid
) < 0) {
176 fprintf(stderr
, "Failed to setgid(%d)\n", 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)
221 len
= read(fds
[0], &status
, 1);
222 if (len
== -1 && (errno
== EINTR
))
227 else if (status
== 1) {
228 fprintf(stderr
, "Could not acquire pidfile: %s\n", strerror(errno
));
236 qemu_set_cloexec(fds
[1]);
248 signal(SIGTSTP
, SIG_IGN
);
249 signal(SIGTTOU
, SIG_IGN
);
250 signal(SIGTTIN
, SIG_IGN
);
254 void os_setup_post(void)
263 len
= write(fds
[1], &status
, 1);
264 if (len
== -1 && (errno
== EINTR
))
271 perror("not able to chdir to /");
274 TFR(fd
= qemu_open("/dev/null", O_RDWR
));
280 change_process_uid();
291 void os_pidfile_error(void)
295 if (write(fds
[1], &status
, 1) != 1) {
296 perror("daemonize. Writing to pipe\n");
299 fprintf(stderr
, "Could not acquire pid file: %s\n", strerror(errno
));
302 void os_set_line_buffering(void)
304 setvbuf(stdout
, NULL
, _IOLBF
, 0);