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authornormal <normal@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2014-05-28 00:53:11 (GMT)
committernormal <normal@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2014-05-28 00:53:11 (GMT)
commite303785dde0bfbb89979dc97a755c6be5fce71fe (patch)
treeb97ef9c40cd3e049bcb6b02b15c5253199e49774 /signal.c
parent9e9fcfeef4db34730ceca52a0a250cbd499c6df8 (diff)
signal: remove window for SignalException on IGNORE
* signal.c (signal_exec): ignore immediate cmd for SIG_IGN * signal.c (trap_handler): set cmd to true for SIG_IGN * signal.c (trap): handle nil and true values for oldcmd [Bug #9835] git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46194 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'signal.c')
-rw-r--r--signal.c14
1 files changed, 13 insertions, 1 deletions
diff --git a/signal.c b/signal.c
index 6750760..8e84db5 100644
--- a/signal.c
+++ b/signal.c
@@ -826,6 +826,15 @@ signal_exec(VALUE cmd, int safe, int sig)
volatile unsigned long old_interrupt_mask = cur_th->interrupt_mask;
int state;
+ /*
+ * workaround the following race:
+ * 1. signal_enque queues signal for execution
+ * 2. user calls trap(sig, "IGNORE"), setting SIG_IGN
+ * 3. rb_signal_exec runs on queued signal
+ */
+ if (IMMEDIATE_P(cmd))
+ return;
+
cur_th->interrupt_mask |= TRAP_INTERRUPT_MASK;
TH_PUSH_TAG(cur_th);
if ((state = EXEC_TAG()) == 0) {
@@ -977,7 +986,7 @@ trap_handler(VALUE *cmd, int sig)
if (strncmp(RSTRING_PTR(command), "SIG_IGN", 7) == 0) {
sig_ign:
func = SIG_IGN;
- *cmd = 0;
+ *cmd = Qtrue;
}
else if (strncmp(RSTRING_PTR(command), "SIG_DFL", 7) == 0) {
sig_dfl:
@@ -1058,11 +1067,14 @@ trap(int sig, sighandler_t func, VALUE command)
oldcmd = vm->trap_list[sig].cmd;
switch (oldcmd) {
case 0:
+ case Qtrue:
if (oldfunc == SIG_IGN) oldcmd = rb_str_new2("IGNORE");
else if (oldfunc == SIG_DFL) oldcmd = rb_str_new2("SYSTEM_DEFAULT");
else if (oldfunc == sighandler) oldcmd = rb_str_new2("DEFAULT");
else oldcmd = Qnil;
break;
+ case Qnil:
+ break;
case Qundef:
oldcmd = rb_str_new2("EXIT");
break;