#include <unistd.h>
#include <fcntl.h>
#include <signal.h>
+#include <sys/types.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"
+
+#ifdef CONFIG_LINUX
+#include <sys/prctl.h>
+#endif
+
+#ifdef __FreeBSD__
+#include <sys/sysctl.h>
+#endif
+
+static struct passwd *user_pwd;
+static const char *chroot_dir;
+static int daemonize;
+static int fds[2];
void os_setup_early_signal_handling(void)
{
act.sa_handler = SIG_IGN;
sigaction(SIGPIPE, &act, NULL);
}
+
+static void termsig_handler(int signal, siginfo_t *info, void *c)
+{
+ 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_sigaction = termsig_handler;
+ act.sa_flags = SA_SIGINFO;
+ sigaction(SIGINT, &act, NULL);
+ sigaction(SIGHUP, &act, NULL);
+ sigaction(SIGTERM, &act, NULL);
+}
+
+/* Find a likely location for support files using the location of the binary.
+ For installed binaries this will be "$bindir/../share/qemu". When
+ running from the build tree this will be "$bindir/../pc-bios". */
+#define SHARE_SUFFIX "/share/qemu"
+#define BUILD_SUFFIX "/pc-bios"
+char *os_find_datadir(const char *argv0)
+{
+ char *dir;
+ char *p = NULL;
+ 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, ARRAY_SIZE(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;
+ }
+ }
+ dir = dirname(p);
+ dir = dirname(dir);
+
+ max_len = strlen(dir) +
+ MAX(strlen(SHARE_SUFFIX), strlen(BUILD_SUFFIX)) + 1;
+ 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)) {
+ g_free(res);
+ res = NULL;
+ }
+ }
+
+ 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
+ */
+void os_parse_cmd_args(int index, const char *optarg)
+{
+ switch (index) {
+#ifdef CONFIG_SLIRP
+ case QEMU_OPTION_smb:
+ if (net_slirp_smb(optarg) < 0)
+ exit(1);
+ break;
+#endif
+ case QEMU_OPTION_runas:
+ user_pwd = getpwnam(optarg);
+ if (!user_pwd) {
+ fprintf(stderr, "User \"%s\" doesn't exist\n", optarg);
+ 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
+ }
+}
+
+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);
+ }
+ if (setuid(0) != -1) {
+ fprintf(stderr, "Dropping privileges failed\n");
+ 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;
+
+ if (pipe(fds) == -1)
+ exit(1);
+
+ pid = fork();
+ if (pid > 0) {
+ uint8_t status;
+ ssize_t len;
+
+ close(fds[1]);
+
+ again:
+ len = read(fds[0], &status, 1);
+ if (len == -1 && (errno == EINTR))
+ goto again;
+
+ if (len != 1)
+ exit(1);
+ else if (status == 1) {
+ fprintf(stderr, "Could not acquire pidfile: %s\n", strerror(errno));
+ exit(1);
+ } else
+ exit(0);
+ } else if (pid < 0)
+ exit(1);
+
+ close(fds[0]);
+ qemu_set_cloexec(fds[1]);
+
+ 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);
+ }
+}
+
+void os_setup_post(void)
+{
+ int fd = 0;
+
+ if (daemonize) {
+ uint8_t status = 0;
+ ssize_t len;
+
+ again1:
+ len = write(fds[1], &status, 1);
+ if (len == -1 && (errno == EINTR))
+ goto again1;
+
+ if (len != 1)
+ exit(1);
+
+ 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) {
+ dup2(fd, 0);
+ dup2(fd, 1);
+ dup2(fd, 2);
+
+ close(fd);
+ }
+}
+
+void os_pidfile_error(void)
+{
+ if (daemonize) {
+ uint8_t status = 1;
+ if (write(fds[1], &status, 1) != 1) {
+ perror("daemonize. Writing to pipe\n");
+ }
+ } else
+ fprintf(stderr, "Could not acquire pid file: %s\n", strerror(errno));
+}
+
+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