* THE SOFTWARE.
*/
-#include <unistd.h>
-#include <fcntl.h>
-#include <signal.h>
-#include <sys/types.h>
+#include "qemu/osdep.h"
#include <sys/wait.h>
+/*needed for MAP_POPULATE before including qemu-options.h */
+#include <sys/mman.h>
#include <pwd.h>
+#include <grp.h>
#include <libgen.h>
/* Needed early for CONFIG_BSD etc. */
-#include "config-host.h"
-#include "sysemu.h"
+#include "sysemu/sysemu.h"
#include "net/slirp.h"
#include "qemu-options.h"
+#include "qemu/rcu.h"
+#include "qemu/error-report.h"
+#include "qemu/log.h"
+
+#ifdef CONFIG_LINUX
+#include <sys/prctl.h>
+#endif
static struct passwd *user_pwd;
+static const char *chroot_dir;
+static int daemonize;
+static int daemon_pipe;
void os_setup_early_signal_handling(void)
{
sigaction(SIGPIPE, &act, NULL);
}
-static void termsig_handler(int signal)
-{
- qemu_system_shutdown_request();
-}
-
-static void sigchld_handler(int signal)
+static void termsig_handler(int signal, siginfo_t *info, void *c)
{
- waitpid(-1, NULL, WNOHANG);
+ qemu_system_killed(info->si_signo, info->si_pid);
}
void os_setup_signal_handling(void)
struct sigaction act;
memset(&act, 0, sizeof(act));
- act.sa_handler = termsig_handler;
+ act.sa_sigaction = termsig_handler;
+ act.sa_flags = SA_SIGINFO;
sigaction(SIGINT, &act, NULL);
sigaction(SIGHUP, &act, NULL);
sigaction(SIGTERM, &act, NULL);
-
- act.sa_handler = sigchld_handler;
- act.sa_flags = SA_NOCLDSTOP;
- sigaction(SIGCHLD, &act, NULL);
}
/* Find a likely location for support files using the location of the binary.
running from the build tree this will be "$bindir/../pc-bios". */
#define SHARE_SUFFIX "/share/qemu"
#define BUILD_SUFFIX "/pc-bios"
-char *os_find_datadir(const char *argv0)
+char *os_find_datadir(void)
{
- char *dir;
- char *p = NULL;
+ char *dir, *exec_dir;
char *res;
- char buf[PATH_MAX];
size_t max_len;
-#if defined(__linux__)
- {
- int len;
- len = readlink("/proc/self/exe", buf, sizeof(buf) - 1);
- if (len > 0) {
- buf[len] = 0;
- p = buf;
- }
- }
-#elif defined(__FreeBSD__)
- {
- static int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1};
- size_t len = sizeof(buf) - 1;
-
- *buf = '\0';
- if (!sysctl(mib, sizeof(mib)/sizeof(*mib), buf, &len, NULL, 0) &&
- *buf) {
- buf[sizeof(buf) - 1] = '\0';
- p = buf;
- }
- }
-#endif
- /* If we don't have any way of figuring out the actual executable
- location then try argv[0]. */
- if (!p) {
- p = realpath(argv0, buf);
- if (!p) {
- return NULL;
- }
+ exec_dir = qemu_get_exec_dir();
+ if (exec_dir == NULL) {
+ return NULL;
}
- dir = dirname(p);
- dir = dirname(dir);
+ dir = dirname(exec_dir);
max_len = strlen(dir) +
MAX(strlen(SHARE_SUFFIX), strlen(BUILD_SUFFIX)) + 1;
- res = qemu_mallocz(max_len);
+ res = g_malloc0(max_len);
snprintf(res, max_len, "%s%s", dir, SHARE_SUFFIX);
if (access(res, R_OK)) {
snprintf(res, max_len, "%s%s", dir, BUILD_SUFFIX);
if (access(res, R_OK)) {
- qemu_free(res);
+ g_free(res);
res = NULL;
}
}
+ g_free(exec_dir);
return res;
}
#undef SHARE_SUFFIX
#undef BUILD_SUFFIX
+void os_set_proc_name(const char *s)
+{
+#if defined(PR_SET_NAME)
+ char name[16];
+ if (!s)
+ return;
+ pstrcpy(name, sizeof(name), s);
+ /* Could rewrite argv[0] too, but that's a bit more complicated.
+ This simple way is enough for `top'. */
+ if (prctl(PR_SET_NAME, name)) {
+ perror("unable to change process name");
+ exit(1);
+ }
+#else
+ fprintf(stderr, "Change of process name not supported by your OS\n");
+ exit(1);
+#endif
+}
+
/*
* Parse OS specific command line options.
* return 0 if option handled, -1 otherwise
switch (index) {
#ifdef CONFIG_SLIRP
case QEMU_OPTION_smb:
+ error_report("The -smb option is deprecated. "
+ "Please use '-netdev user,smb=...' instead.");
if (net_slirp_smb(optarg) < 0)
exit(1);
break;
exit(1);
}
break;
+ case QEMU_OPTION_chroot:
+ chroot_dir = optarg;
+ break;
+ case QEMU_OPTION_daemonize:
+ daemonize = 1;
+ break;
+#if defined(CONFIG_LINUX)
+ case QEMU_OPTION_enablefips:
+ fips_set_state(true);
+ break;
+#endif
}
- return;
}
-void os_change_process_uid(void)
+static void change_process_uid(void)
{
if (user_pwd) {
if (setgid(user_pwd->pw_gid) < 0) {
fprintf(stderr, "Failed to setgid(%d)\n", user_pwd->pw_gid);
exit(1);
}
+ if (initgroups(user_pwd->pw_name, user_pwd->pw_gid) < 0) {
+ fprintf(stderr, "Failed to initgroups(\"%s\", %d)\n",
+ user_pwd->pw_name, user_pwd->pw_gid);
+ exit(1);
+ }
if (setuid(user_pwd->pw_uid) < 0) {
fprintf(stderr, "Failed to setuid(%d)\n", user_pwd->pw_uid);
exit(1);
}
}
}
+
+static void change_root(void)
+{
+ if (chroot_dir) {
+ if (chroot(chroot_dir) < 0) {
+ fprintf(stderr, "chroot failed\n");
+ exit(1);
+ }
+ if (chdir("/")) {
+ perror("not able to chdir to /");
+ exit(1);
+ }
+ }
+
+}
+
+void os_daemonize(void)
+{
+ if (daemonize) {
+ pid_t pid;
+ int fds[2];
+
+ if (pipe(fds) == -1) {
+ exit(1);
+ }
+
+ pid = fork();
+ if (pid > 0) {
+ uint8_t status;
+ ssize_t len;
+
+ close(fds[1]);
+
+ do {
+ len = read(fds[0], &status, 1);
+ } while (len < 0 && errno == EINTR);
+
+ /* only exit successfully if our child actually wrote
+ * a one-byte zero to our pipe, upon successful init */
+ exit(len == 1 && status == 0 ? 0 : 1);
+
+ } else if (pid < 0) {
+ exit(1);
+ }
+
+ close(fds[0]);
+ daemon_pipe = fds[1];
+ qemu_set_cloexec(daemon_pipe);
+
+ setsid();
+
+ pid = fork();
+ if (pid > 0) {
+ exit(0);
+ } else if (pid < 0) {
+ exit(1);
+ }
+ umask(027);
+
+ signal(SIGTSTP, SIG_IGN);
+ signal(SIGTTOU, SIG_IGN);
+ signal(SIGTTIN, SIG_IGN);
+ rcu_after_fork();
+ }
+}
+
+void os_setup_post(void)
+{
+ int fd = 0;
+
+ if (daemonize) {
+ if (chdir("/")) {
+ perror("not able to chdir to /");
+ exit(1);
+ }
+ TFR(fd = qemu_open("/dev/null", O_RDWR));
+ if (fd == -1) {
+ exit(1);
+ }
+ }
+
+ change_root();
+ change_process_uid();
+
+ if (daemonize) {
+ uint8_t status = 0;
+ ssize_t len;
+
+ dup2(fd, 0);
+ dup2(fd, 1);
+ /* In case -D is given do not redirect stderr to /dev/null */
+ if (!qemu_logfile) {
+ dup2(fd, 2);
+ }
+
+ close(fd);
+
+ do {
+ len = write(daemon_pipe, &status, 1);
+ } while (len < 0 && errno == EINTR);
+ if (len != 1) {
+ exit(1);
+ }
+ }
+}
+
+void os_set_line_buffering(void)
+{
+ setvbuf(stdout, NULL, _IOLBF, 0);
+}
+
+int qemu_create_pidfile(const char *filename)
+{
+ char buffer[128];
+ int len;
+ int fd;
+
+ fd = qemu_open(filename, O_RDWR | O_CREAT, 0600);
+ if (fd == -1) {
+ return -1;
+ }
+ if (lockf(fd, F_TLOCK, 0) == -1) {
+ close(fd);
+ return -1;
+ }
+ len = snprintf(buffer, sizeof(buffer), FMT_pid "\n", getpid());
+ if (write(fd, buffer, len) != len) {
+ close(fd);
+ return -1;
+ }
+
+ /* keep pidfile open & locked forever */
+ return 0;
+}
+
+bool is_daemonized(void)
+{
+ return daemonize;
+}
+
+int os_mlock(void)
+{
+ int ret = 0;
+
+ ret = mlockall(MCL_CURRENT | MCL_FUTURE);
+ if (ret < 0) {
+ perror("mlockall");
+ }
+
+ return ret;
+}
projects / qemu.git / blobdiff