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signal fix: update the host signal 'signal ignored' state to avoid unexpected -EINTR values (ash fix)

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git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@503 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2004-01-04 17:15:59 +00:00
parent 82c7e2a4c6
commit 773b93ee06
1 changed files with 23 additions and 29 deletions
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52
linux-user/signal.c
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@ -370,33 +370,6 @@ int queue_signal(int sig, target_siginfo_t *info)
}
}
#if defined(DEBUG_SIGNAL)
#ifdef __i386__
static void dump_regs(struct ucontext *uc)
{
fprintf(stderr,
"EAX=%08x EBX=%08x ECX=%08x EDX=%08x\n"
"ESI=%08x EDI=%08x EBP=%08x ESP=%08x\n"
"EFL=%08x EIP=%08x\n",
uc->uc_mcontext.gregs[EAX],
uc->uc_mcontext.gregs[EBX],
uc->uc_mcontext.gregs[ECX],
uc->uc_mcontext.gregs[EDX],
uc->uc_mcontext.gregs[ESI],
uc->uc_mcontext.gregs[EDI],
uc->uc_mcontext.gregs[EBP],
uc->uc_mcontext.gregs[ESP],
uc->uc_mcontext.gregs[EFL],
uc->uc_mcontext.gregs[EIP]);
}
#else
static void dump_regs(struct ucontext *uc)
{
}
#endif
#endif
static void host_signal_handler(int host_signum, siginfo_t *info,
void *puc)
{
@ -416,7 +389,6 @@ static void host_signal_handler(int host_signum, siginfo_t *info,
return;
#if defined(DEBUG_SIGNAL)
fprintf(stderr, "qemu: got signal %d\n", sig);
dump_regs(puc);
#endif
host_to_target_siginfo_noswap(&tinfo, info);
if (queue_signal(sig, &tinfo) == 1) {
@ -429,11 +401,13 @@ int do_sigaction(int sig, const struct target_sigaction *act,
struct target_sigaction *oact)
{
struct emulated_sigaction *k;
struct sigaction act1;
int host_sig;
if (sig < 1 || sig > TARGET_NSIG)
return -EINVAL;
k = &sigact_table[sig - 1];
#if defined(DEBUG_SIGNAL) && 0
#if defined(DEBUG_SIGNAL)
fprintf(stderr, "sigaction sig=%d act=0x%08x, oact=0x%08x\n",
sig, (int)act, (int)oact);
#endif
@ -448,6 +422,26 @@ int do_sigaction(int sig, const struct target_sigaction *act,
k->sa.sa_flags = tswapl(act->sa_flags);
k->sa.sa_restorer = tswapl(act->sa_restorer);
k->sa.sa_mask = act->sa_mask;
/* we update the host linux signal state */
host_sig = target_to_host_signal(sig);
if (host_sig != SIGSEGV && host_sig != SIGBUS) {
sigfillset(&act1.sa_mask);
act1.sa_flags = SA_SIGINFO;
if (k->sa.sa_flags & TARGET_SA_RESTART)
act1.sa_flags |= SA_RESTART;
/* NOTE: it is important to update the host kernel signal
ignore state to avoid getting unexpected interrupted
syscalls */
if (k->sa._sa_handler == TARGET_SIG_IGN) {
act1.sa_sigaction = (void *)SIG_IGN;
} else if (k->sa._sa_handler == TARGET_SIG_DFL) {
act1.sa_sigaction = (void *)SIG_DFL;
} else {
act1.sa_sigaction = host_signal_handler;
}
sigaction(host_sig, &act1, NULL);
}
}
return 0;
}