diff options
Diffstat (limited to 'linux-user/signal.c')
| -rw-r--r-- | linux-user/signal.c | 37 |
1 files changed, 25 insertions, 12 deletions
diff --git a/linux-user/signal.c b/linux-user/signal.c index fc37dc11ff..75047251bb 100644 --- a/linux-user/signal.c +++ b/linux-user/signal.c @@ -25,6 +25,7 @@ #include <unistd.h> #include <signal.h> #include <errno.h> +#include <assert.h> #include <sys/ucontext.h> #include "qemu.h" @@ -352,22 +353,34 @@ static inline void free_sigqueue(CPUState *env, struct sigqueue *q) static void QEMU_NORETURN force_sig(int sig) { int host_sig; + struct sigaction act; host_sig = target_to_host_signal(sig); fprintf(stderr, "qemu: uncaught target signal %d (%s) - exiting\n", sig, strsignal(host_sig)); -#if 1 gdb_signalled(thread_env, sig); - _exit(-host_sig); -#else - { - struct sigaction act; - sigemptyset(&act.sa_mask); - act.sa_flags = SA_SIGINFO; - act.sa_sigaction = SIG_DFL; - sigaction(SIGABRT, &act, NULL); - abort(); - } -#endif + + /* The proper exit code for dieing from an uncaught signal is + * -<signal>. The kernel doesn't allow exit() or _exit() to pass + * a negative value. To get the proper exit code we need to + * actually die from an uncaught signal. Here the default signal + * handler is installed, we send ourself a signal and we wait for + * it to arrive. */ + sigfillset(&act.sa_mask); + act.sa_handler = SIG_DFL; + sigaction(host_sig, &act, NULL); + + /* For some reason raise(host_sig) doesn't send the signal when + * statically linked on x86-64. */ + kill(getpid(), host_sig); + + /* Make sure the signal isn't masked (just reuse the mask inside + of act) */ + sigdelset(&act.sa_mask, host_sig); + sigsuspend(&act.sa_mask); + + /* unreachable */ + assert(0); + } /* queue a signal so that it will be send to the virtual CPU as soon |