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Fix alternate stack cleanup on MUSL #18685

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Jun 28, 2018
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Fix alternate stack cleanup on MUSL #18685

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4 changes: 4 additions & 0 deletions src/pal/src/exception/signal.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -199,6 +199,10 @@ Return :
void FreeSignalAlternateStack()
{
stack_t ss, oss;
// The man page for sigaltstack says that when the ss.ss_flags is set to SS_DISABLE,
// all other ss fields are ignored. However, MUSL implementation checks that the
// ss_size is >= MINSIGSTKSZ even in this case.
ss.ss_size = MINSIGSTKSZ;
ss.ss_flags = SS_DISABLE;
int st = sigaltstack(&ss, &oss);
if ((st == 0) && (oss.ss_flags != SS_DISABLE))
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