archive/jdk
1
0
Fork 0
mirror of https://github.com/openjdk/jdk.git synced 2025-08-28 15:24:43 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions

8293466: libjsig should ignore non-modifying sigaction calls

Browse source 
Reviewed-by: manc, dholmes
This commit is contained in:
Thomas Stuefe 2022-09-19 05:38:09 +00:00
parent b6ff8fa307
commit b1ed40a87a
1 changed files with 19 additions and 8 deletions
Download patch file Download diff file Expand all files Collapse all files

21
src/java.base/unix/native/libjsig/jsig.c
View file

@ -248,16 +248,27 @@ JNIEXPORT int sigaction(int sig, const struct sigaction *act, struct sigaction *
signal_unlock();
return 0;
} else if (jvm_signal_installing) {
/* jvm is installing its signal handlers. Install the new
* handlers and save the old ones. */
/* jvm is installing its signal handlers.
* - if this is a modifying sigaction call, we install a new signal handler and store the old one
* as chained signal handler.
* - if this is a non-modifying sigaction call, we don't change any state; we just return the existing
* signal handler in the system (not the stored one).
* This works under the assumption that there is only one modifying sigaction call for a specific signal
* within the JVM_begin_signal_setting-JVM_end_signal_setting-window. There can be any number of non-modifying
* calls, but they will only return the expected preexisting handler if executed before the modifying call.
*/
res = call_os_sigaction(sig, act, &oldAct);
if (res == 0) {
if (act != NULL) {
/* store pre-existing handler as chained handler */
sact[sig] = oldAct;
/* Record the signals used by jvm. */
sigaddset(&jvmsigs, sig);
}
if (oact != NULL) {
*oact = oldAct;
}
/* Record the signals used by jvm. */
sigaddset(&jvmsigs, sig);
}
signal_unlock();
return res;