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git.proxmox.com Git - qemu.git/blob - os-posix.c
6417d16dcab51813412fe07682644a62892503b2
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
;
43 void os_setup_early_signal_handling(void)
46 sigfillset(&act
.sa_mask
);
48 act
.sa_handler
= SIG_IGN
;
49 sigaction(SIGPIPE
, &act
, NULL
);
52 static void termsig_handler(int signal
)
54 qemu_system_shutdown_request();
57 static void sigchld_handler(int signal
)
59 waitpid(-1, NULL
, WNOHANG
);
62 void os_setup_signal_handling(void)
66 memset(&act
, 0, sizeof(act
));
67 act
.sa_handler
= termsig_handler
;
68 sigaction(SIGINT
, &act
, NULL
);
69 sigaction(SIGHUP
, &act
, NULL
);
70 sigaction(SIGTERM
, &act
, NULL
);
72 act
.sa_handler
= sigchld_handler
;
73 act
.sa_flags
= SA_NOCLDSTOP
;
74 sigaction(SIGCHLD
, &act
, NULL
);
77 /* Find a likely location for support files using the location of the binary.
78 For installed binaries this will be "$bindir/../share/qemu". When
79 running from the build tree this will be "$bindir/../pc-bios". */
80 #define SHARE_SUFFIX "/share/qemu"
81 #define BUILD_SUFFIX "/pc-bios"
82 char *os_find_datadir(const char *argv0
)
90 #if defined(__linux__)
93 len
= readlink("/proc/self/exe", buf
, sizeof(buf
) - 1);
99 #elif defined(__FreeBSD__)
101 static int mib
[4] = {CTL_KERN
, KERN_PROC
, KERN_PROC_PATHNAME
, -1};
102 size_t len
= sizeof(buf
) - 1;
105 if (!sysctl(mib
, sizeof(mib
)/sizeof(*mib
), buf
, &len
, NULL
, 0) &&
107 buf
[sizeof(buf
) - 1] = '\0';
112 /* If we don't have any way of figuring out the actual executable
113 location then try argv[0]. */
115 p
= realpath(argv0
, buf
);
123 max_len
= strlen(dir
) +
124 MAX(strlen(SHARE_SUFFIX
), strlen(BUILD_SUFFIX
)) + 1;
125 res
= qemu_mallocz(max_len
);
126 snprintf(res
, max_len
, "%s%s", dir
, SHARE_SUFFIX
);
127 if (access(res
, R_OK
)) {
128 snprintf(res
, max_len
, "%s%s", dir
, BUILD_SUFFIX
);
129 if (access(res
, R_OK
)) {
141 * Parse OS specific command line options.
142 * return 0 if option handled, -1 otherwise
144 void os_parse_cmd_args(int index
, const char *optarg
)
148 case QEMU_OPTION_smb
:
149 if (net_slirp_smb(optarg
) < 0)
153 case QEMU_OPTION_runas
:
154 user_pwd
= getpwnam(optarg
);
156 fprintf(stderr
, "User \"%s\" doesn't exist\n", optarg
);
160 case QEMU_OPTION_chroot
:
167 void os_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 (setuid(user_pwd
->pw_uid
) < 0) {
175 fprintf(stderr
, "Failed to setuid(%d)\n", user_pwd
->pw_uid
);
178 if (setuid(0) != -1) {
179 fprintf(stderr
, "Dropping privileges failed\n");
185 void os_change_root(void)
188 if (chroot(chroot_dir
) < 0) {
189 fprintf(stderr
, "chroot failed\n");
193 perror("not able to chdir to /");