909
910 // Returns true if signal number is valid.
911 bool os::Posix::is_valid_signal(int sig) {
912 // MacOS not really POSIX compliant: sigaddset does not return
913 // an error for invalid signal numbers. However, MacOS does not
914 // support real time signals and simply seems to have just 33
915 // signals with no holes in the signal range.
916 #ifdef __APPLE__
917 return sig >= 1 && sig < NSIG;
918 #else
919 // Use sigaddset to check for signal validity.
920 sigset_t set;
921 sigemptyset(&set);
922 if (sigaddset(&set, sig) == -1 && errno == EINVAL) {
923 return false;
924 }
925 return true;
926 #endif
927 }
928
929 // Returns:
930 // NULL for an invalid signal number
931 // "SIG<num>" for a valid but unknown signal number
932 // signal name otherwise.
933 const char* os::exception_name(int sig, char* buf, size_t size) {
934 if (!os::Posix::is_valid_signal(sig)) {
935 return NULL;
936 }
937 const char* const name = os::Posix::get_signal_name(sig, buf, size);
938 if (strcmp(name, "UNKNOWN") == 0) {
939 jio_snprintf(buf, size, "SIG%d", sig);
940 }
941 return buf;
942 }
943
944 #define NUM_IMPORTANT_SIGS 32
945 // Returns one-line short description of a signal set in a user provided buffer.
946 const char* os::Posix::describe_signal_set_short(const sigset_t* set, char* buffer, size_t buf_size) {
947 assert(buf_size == (NUM_IMPORTANT_SIGS + 1), "wrong buffer size");
948 // Note: for shortness, just print out the first 32. That should
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909
910 // Returns true if signal number is valid.
911 bool os::Posix::is_valid_signal(int sig) {
912 // MacOS not really POSIX compliant: sigaddset does not return
913 // an error for invalid signal numbers. However, MacOS does not
914 // support real time signals and simply seems to have just 33
915 // signals with no holes in the signal range.
916 #ifdef __APPLE__
917 return sig >= 1 && sig < NSIG;
918 #else
919 // Use sigaddset to check for signal validity.
920 sigset_t set;
921 sigemptyset(&set);
922 if (sigaddset(&set, sig) == -1 && errno == EINVAL) {
923 return false;
924 }
925 return true;
926 #endif
927 }
928
929 bool os::Posix::is_sig_ignored(int sig) {
930 struct sigaction oact;
931 sigaction(sig, (struct sigaction*)NULL, &oact);
932 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction)
933 : CAST_FROM_FN_PTR(void*, oact.sa_handler);
934 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) {
935 return true;
936 } else {
937 return false;
938 }
939 }
940
941 // Returns:
942 // NULL for an invalid signal number
943 // "SIG<num>" for a valid but unknown signal number
944 // signal name otherwise.
945 const char* os::exception_name(int sig, char* buf, size_t size) {
946 if (!os::Posix::is_valid_signal(sig)) {
947 return NULL;
948 }
949 const char* const name = os::Posix::get_signal_name(sig, buf, size);
950 if (strcmp(name, "UNKNOWN") == 0) {
951 jio_snprintf(buf, size, "SIG%d", sig);
952 }
953 return buf;
954 }
955
956 #define NUM_IMPORTANT_SIGS 32
957 // Returns one-line short description of a signal set in a user provided buffer.
958 const char* os::Posix::describe_signal_set_short(const sigset_t* set, char* buffer, size_t buf_size) {
959 assert(buf_size == (NUM_IMPORTANT_SIGS + 1), "wrong buffer size");
960 // Note: for shortness, just print out the first 32. That should
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