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linux-user: proper exit code for uncaught signals 

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.

A default signal handler is installed, we send ourself a signal
and we wait for it to arrive.

Patch originates from Scratchbox

Signed-off-by: Riku Voipio <riku.voipio@iki.fi>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@7119 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aurel32 2009-04-15 16:18:38 +00:00
parent 3b3f24add0
commit 603e4fd7b1
1 changed files with 25 additions and 12 deletions
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37
linux-user/signal.c
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@ -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