static int qemu_signal_init(void) { int sigfd; sigset_t set; /* * SIG_IPI must be blocked in the main thread and must not be caught * by sigwait() in the signal thread. Otherwise, the cpu thread will * not catch it reliably. */ sigemptyset(&set); sigaddset(&set, SIG_IPI); sigaddset(&set, SIGIO); sigaddset(&set, SIGALRM); sigaddset(&set, SIGBUS); pthread_sigmask(SIG_BLOCK, &set, NULL); sigdelset(&set, SIG_IPI); sigfd = qemu_signalfd(&set); if (sigfd == -1) { fprintf(stderr, "failed to create signalfd\n"); return -errno; } fcntl_setfl(sigfd, O_NONBLOCK); qemu_set_fd_handler2(sigfd, NULL, sigfd_handler, NULL, (void *)(intptr_t)sigfd); return 0; }
static int qemu_signal_init(Error **errp) { int sigfd; sigset_t set; /* * SIG_IPI must be blocked in the main thread and must not be caught * by sigwait() in the signal thread. Otherwise, the cpu thread will * not catch it reliably. */ sigemptyset(&set); sigaddset(&set, SIG_IPI); sigaddset(&set, SIGIO); sigaddset(&set, SIGALRM); sigaddset(&set, SIGBUS); /* SIGINT cannot be handled via signalfd, so that ^C can be used * to interrupt QEMU when it is being run under gdb. SIGHUP and * SIGTERM are also handled asynchronously, even though it is not * strictly necessary, because they use the same handler as SIGINT. */ pthread_sigmask(SIG_BLOCK, &set, NULL); sigdelset(&set, SIG_IPI); sigfd = qemu_signalfd(&set); if (sigfd == -1) { error_setg_errno(errp, errno, "failed to create signalfd"); return -errno; } fcntl_setfl(sigfd, O_NONBLOCK); qemu_set_fd_handler(sigfd, sigfd_handler, NULL, (void *)(intptr_t)sigfd); return 0; }
static int qemu_signal_init(void) { int sigfd; sigset_t set; #ifdef CONFIG_IOTHREAD /* SIGUSR2 used by posix-aio-compat.c */ sigemptyset(&set); sigaddset(&set, SIGUSR2); pthread_sigmask(SIG_UNBLOCK, &set, NULL); /* * SIG_IPI must be blocked in the main thread and must not be caught * by sigwait() in the signal thread. Otherwise, the cpu thread will * not catch it reliably. */ sigemptyset(&set); sigaddset(&set, SIG_IPI); pthread_sigmask(SIG_BLOCK, &set, NULL); sigemptyset(&set); sigaddset(&set, SIGIO); sigaddset(&set, SIGALRM); sigaddset(&set, SIGBUS); #else sigemptyset(&set); sigaddset(&set, SIGBUS); if (kvm_enabled()) { /* * We need to process timer signals synchronously to avoid a race * between exit_request check and KVM vcpu entry. */ sigaddset(&set, SIGIO); sigaddset(&set, SIGALRM); } #endif pthread_sigmask(SIG_BLOCK, &set, NULL); sigfd = qemu_signalfd(&set); if (sigfd == -1) { fprintf(stderr, "failed to create signalfd\n"); return -errno; } fcntl_setfl(sigfd, O_NONBLOCK); qemu_set_fd_handler2(sigfd, NULL, sigfd_handler, NULL, (void *)(intptr_t)sigfd); return 0; }
static int qemu_signalfd_init(sigset_t mask) { int sigfd; sigfd = qemu_signalfd(&mask); if (sigfd == -1) { fprintf(stderr, "failed to create signalfd\n"); return -errno; } fcntl_setfl(sigfd, O_NONBLOCK); qemu_set_fd_handler2(sigfd, NULL, sigfd_handler, NULL, (void *)(unsigned long) sigfd); return 0; }
static int posix_aio_init(void) { sigset_t mask; PosixAioState *s; struct qemu_paioinit ai; if (posix_aio_state) return 0; s = qemu_malloc(sizeof(PosixAioState)); /* Make sure to block AIO signal */ sigemptyset(&mask); sigaddset(&mask, SIGUSR2); sigprocmask(SIG_BLOCK, &mask, NULL); s->first_aio = NULL; s->fd = qemu_signalfd(&mask); if (s->fd == -1) { fprintf(stderr, "failed to create signalfd\n"); return -errno; } fcntl(s->fd, F_SETFL, O_NONBLOCK); qemu_aio_set_fd_handler(s->fd, posix_aio_read, NULL, posix_aio_flush, s); memset(&ai, 0, sizeof(ai)); ai.aio_threads = 64; ai.aio_num = 64; qemu_paio_init(&ai); posix_aio_state = s; return 0; }