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npe: sigemptyset and more signal stuff

--- a/include/npe/signal.h

+++ b/include/npe/signal.h

@@ -7,19 +7,27 @@

 	SA_RESETHAND = 1<<0, /* not used */

 	/* all are treated as SIGSEGV */

+	SIGINT = 2,

 	SIGILL = 4,

 	SIGABRT = 6,

 	SIGFPE = 8,

 	SIGSEGV = 11,

+	SIGTERM = 15,

 };

+typedef u64int sigset_t;

+

 typedef void (*sa_handler)(int);

 struct sigaction {

 	sa_handler sa_handler;

 	int sa_flags;

+	sigset_t sa_mask;

 };

+extern sa_handler SIG_DFL, SIG_IGN;

+

 void sigaction(int, struct sigaction *, struct sigaction *);

+int sigemptyset(sigset_t *set);

 #endif

--- a/libnpe/mkfile

+++ b/libnpe/mkfile

@@ -50,6 +50,7 @@

 	round.$O\

 	setenv.$O\

 	sigaction.$O\

+	sigemptyset.$O\

 	stat.$O\

 	strerror.$O\

 	strftime.$O\

--- a/libnpe/sigaction.c

+++ b/libnpe/sigaction.c

@@ -4,6 +4,7 @@

 /* FIXME this only supports a single handler */

 static sa_handler last;

+sa_handler SIG_DFL = (void*)1, SIG_IGN = nil;

 static int

 handler(void*, char *s)

--- /dev/null

+++ b/libnpe/sigemptyset.c

@@ -1,0 +1,8 @@

+#include <signal.h>

+

+int

+sigemptyset(sigset_t *set)

+{

+	*set = 0;

+	return 0;

+}