1 files changed, 99 insertions, 0 deletions
diff --git a/src/backend/libpq/pqsignal.c b/src/backend/libpq/pqsignal.c
new file mode 100644
index 0000000..d233e3a
--- /dev/null
+++ b/src/backend/libpq/pqsignal.c
@@ -0,0 +1,99 @@
+/*-------------------------------------------------------------------------
+ *
+ * pqsignal.c
+ *	  Backend signal(2) support (see also src/port/pqsignal.c)
+ *
+ * Portions Copyright (c) 1996-2023, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ *
+ * IDENTIFICATION
+ *	  src/backend/libpq/pqsignal.c
+ *
+ * ------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include "libpq/pqsignal.h"
+
+
+/* Global variables */
+sigset_t	UnBlockSig,
+			BlockSig,
+			StartupBlockSig;
+
+
+/*
+ * Initialize BlockSig, UnBlockSig, and StartupBlockSig.
+ *
+ * BlockSig is the set of signals to block when we are trying to block
+ * signals.  This includes all signals we normally expect to get, but NOT
+ * signals that should never be turned off.
+ *
+ * StartupBlockSig is the set of signals to block during startup packet
+ * collection; it's essentially BlockSig minus SIGTERM, SIGQUIT, SIGALRM.
+ *
+ * UnBlockSig is the set of signals to block when we don't want to block
+ * signals.
+ */
+void
+pqinitmask(void)
+{
+	sigemptyset(&UnBlockSig);
+
+	/* Note: InitializeLatchSupport() modifies UnBlockSig. */
+
+	/* First set all signals, then clear some. */
+	sigfillset(&BlockSig);
+	sigfillset(&StartupBlockSig);
+
+	/*
+	 * Unmark those signals that should never be blocked. Some of these signal
+	 * names don't exist on all platforms.  Most do, but might as well ifdef
+	 * them all for consistency...
+	 */
+#ifdef SIGTRAP
+	sigdelset(&BlockSig, SIGTRAP);
+	sigdelset(&StartupBlockSig, SIGTRAP);
+#endif
+#ifdef SIGABRT
+	sigdelset(&BlockSig, SIGABRT);
+	sigdelset(&StartupBlockSig, SIGABRT);
+#endif
+#ifdef SIGILL
+	sigdelset(&BlockSig, SIGILL);
+	sigdelset(&StartupBlockSig, SIGILL);
+#endif
+#ifdef SIGFPE
+	sigdelset(&BlockSig, SIGFPE);
+	sigdelset(&StartupBlockSig, SIGFPE);
+#endif
+#ifdef SIGSEGV
+	sigdelset(&BlockSig, SIGSEGV);
+	sigdelset(&StartupBlockSig, SIGSEGV);
+#endif
+#ifdef SIGBUS
+	sigdelset(&BlockSig, SIGBUS);
+	sigdelset(&StartupBlockSig, SIGBUS);
+#endif
+#ifdef SIGSYS
+	sigdelset(&BlockSig, SIGSYS);
+	sigdelset(&StartupBlockSig, SIGSYS);
+#endif
+#ifdef SIGCONT
+	sigdelset(&BlockSig, SIGCONT);
+	sigdelset(&StartupBlockSig, SIGCONT);
+#endif
+
+/* Signals unique to startup */
+#ifdef SIGQUIT
+	sigdelset(&StartupBlockSig, SIGQUIT);
+#endif
+#ifdef SIGTERM
+	sigdelset(&StartupBlockSig, SIGTERM);
+#endif
+#ifdef SIGALRM
+	sigdelset(&StartupBlockSig, SIGALRM);
+#endif
+}