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8141529: Fix handling of _JAVA_SR_SIGNUM

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Reviewed-by: dholmes, stuefe, dsamersoff
This commit is contained in:
Goetz Lindenmaier 2015-11-05 15:05:59 +01:00
parent 3904de571b
commit 0a4657e8c1
10 changed files with 97 additions and 98 deletions
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31
hotspot/src/os/linux/vm/os_linux.cpp
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@ -3989,15 +3989,19 @@ static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
errno = old_errno;
}
static int SR_initialize() {
struct sigaction act;
char *s;
// Get signal number to use for suspend/resume
if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
int sig = ::strtol(s, 0, 10);
if (sig > 0 || sig < _NSIG) {
if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769.
sig < NSIG) { // Must be legal signal and fit into sigflags[].
SR_signum = sig;
} else {
warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.",
sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum);
}
}
@ -4151,8 +4155,11 @@ void signalHandler(int sig, siginfo_t* info, void* uc) {
bool os::Linux::signal_handlers_are_installed = false;
// For signal-chaining
struct sigaction os::Linux::sigact[MAXSIGNUM];
unsigned int os::Linux::sigs = 0;
struct sigaction sigact[NSIG];
uint64_t sigs = 0;
#if (64 < NSIG-1)
#error "Not all signals can be encoded in sigs. Adapt its type!"
#endif
bool os::Linux::libjsig_is_loaded = false;
typedef struct sigaction *(*get_signal_t)(int);
get_signal_t os::Linux::get_signal_action = NULL;
@ -4230,29 +4237,29 @@ bool os::Linux::chained_handler(int sig, siginfo_t* siginfo, void* context) {
}
struct sigaction* os::Linux::get_preinstalled_handler(int sig) {
if ((((unsigned int)1 << sig) & sigs) != 0) {
if ((((uint64_t)1 << (sig-1)) & sigs) != 0) {
return &sigact[sig];
}
return NULL;
}
void os::Linux::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
sigact[sig] = oldAct;
sigs |= (unsigned int)1 << sig;
sigs |= (uint64_t)1 << (sig-1);
}
// for diagnostic
int os::Linux::sigflags[MAXSIGNUM];
int sigflags[NSIG];
int os::Linux::get_our_sigflags(int sig) {
assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
return sigflags[sig];
}
void os::Linux::set_our_sigflags(int sig, int flags) {
assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
if (sig > 0 && sig < MAXSIGNUM) {
assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
if (sig > 0 && sig < NSIG) {
sigflags[sig] = flags;
}
}
@ -4292,7 +4299,7 @@ void os::Linux::set_signal_handler(int sig, bool set_installed) {
sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
}
// Save flags, which are set by ours
assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
sigflags[sig] = sigAct.sa_flags;
int ret = sigaction(sig, &sigAct, &oldAct);