Import sources from 2011-03-30 iso image

1 files changed, 136 insertions, 0 deletions

diff --git a/sys/src/ape/lib/ap/plan9/signal.c b/sys/src/ape/lib/ap/plan9/signal.c
new file mode 100755
index 000000000..cf8a823ef
--- /dev/null
+++ b/sys/src/ape/lib/ap/plan9/signal.c
@@ -0,0 +1,136 @@
+#include "lib.h"
+#include "sys9.h"
+#include <signal.h>
+#include <errno.h>
+#include <string.h>
+#include <setjmp.h>
+
+extern sigset_t	_psigblocked;
+
+static struct {
+	char	*msg;	/* just check prefix */
+	int	num;
+} sigtab[] = {
+	{"hangup",				SIGHUP},
+	{"interrupt",				SIGINT},
+	{"quit",				SIGQUIT},
+	{"alarm",				SIGALRM},
+	{"sys: trap: illegal instruction",	SIGILL},
+	{"sys: trap: reserved instruction",	SIGILL},
+	{"sys: trap: reserved",			SIGILL},
+	{"sys: trap: arithmetic overflow",	SIGFPE},
+	{"abort",				SIGABRT},
+	{"sys: fp:",				SIGFPE},
+	{"exit",				SIGKILL},
+	{"die",					SIGKILL},
+	{"kill",				SIGKILL},
+	{"sys: trap: bus error",		SIGSEGV},
+	{"sys: trap: address error",		SIGSEGV},
+	{"sys: trap: TLB",			SIGSEGV},
+	{"sys: write on closed pipe",		SIGPIPE},
+	{"alarm",				SIGALRM},
+	{"term",				SIGTERM},
+	{"usr1",				SIGUSR1},
+	{"usr2",				SIGUSR2},
+};
+#define NSIGTAB ((sizeof sigtab)/(sizeof (sigtab[0])))
+
+void	(*_sighdlr[MAXSIG+1])(int, char*, Ureg*); /* 0 initialized: SIG_DFL */
+
+void
+(*signal(int sig, void (*func)(int, char*, Ureg*)))(int, char*, Ureg*)
+{
+	void(*oldf)(int, char*, Ureg*);
+
+	if(sig <= 0 || sig > MAXSIG){
+		errno = EINVAL;
+		return SIG_ERR;
+	}
+	oldf = _sighdlr[sig];
+	if(sig == SIGKILL)
+		return oldf;	/* can't catch or ignore SIGKILL */
+	_sighdlr[sig] = func;
+	return oldf;
+}
+
+/* BAD CODE - see /sys/src/ape/lib/ap/$objtype/setjmp.s for real code
+int
+sigsetjmp(sigjmp_buf buf, int savemask)
+{
+	int r;
+
+	buf[0] = savemask;
+	buf[1] = _psigblocked;
+	return setjmp(&buf[2]);
+}
+*/
+
+/*
+ * BUG: improper handling of process signal mask
+ */
+int
+sigaction(int sig, struct sigaction *act, struct sigaction *oact)
+{
+	if(sig <= 0 || sig > MAXSIG || sig == SIGKILL){
+		errno = EINVAL;
+		return -1;
+	}
+	if(oact){
+		oact->sa_handler = _sighdlr[sig];
+		oact->sa_mask = _psigblocked;
+		oact->sa_flags = 0;
+	}
+	if(act){
+		_sighdlr[sig] = act->sa_handler;
+	}
+	return 0;
+}
+
+/* this is registered in _envsetup */
+int
+_notehandler(Ureg *u, char *msg)
+{
+	int i;
+	void(*f)(int, char*, Ureg*);
+	extern void _doatexits(void);	/* in stdio/exit.c */
+
+	if(_finishing)
+		_finish(0, 0);
+	for(i = 0; i<NSIGTAB; i++){
+		if(strncmp(msg, sigtab[i].msg, strlen(sigtab[i].msg)) == 0){
+			f = _sighdlr[sigtab[i].num];
+			if(f == SIG_DFL || f == SIG_ERR)
+				break;
+			if(f != SIG_IGN) {
+				_notetramp(sigtab[i].num, f, u);
+				/* notetramp is machine-dependent; doesn't return to here */
+			}
+			_NOTED(0); /* NCONT */
+			return;
+		}
+	}
+	_doatexits();
+	_NOTED(1); /* NDFLT */
+}
+
+int
+_stringsig(char *nam)
+{
+	int i;
+
+	for(i = 0; i<NSIGTAB; i++)
+		if(strncmp(nam, sigtab[i].msg, strlen(sigtab[i].msg)) == 0)
+			return sigtab[i].num;
+	return 0;
+}
+
+char *
+_sigstring(int sig)
+{
+	int i;
+
+	for(i=0; i<NSIGTAB; i++)
+		if(sigtab[i].num == sig)
+			return sigtab[i].msg;
+	return "unknown signal";
+}