1 files changed, 126 insertions, 0 deletions
diff --git a/src/util/posix_signals.c b/src/util/posix_signals.c
new file mode 100644
index 0000000..8ccddf0
--- /dev/null
+++ b/src/util/posix_signals.c
@@ -0,0 +1,126 @@
+/*++
+/* NAME
+/*	posix_signals 3
+/* SUMMARY
+/*	POSIX signal handling compatibility
+/* SYNOPSIS
+/*	#include <posix_signals.h>
+/*
+/*	int	sigemptyset(m)
+/*	sigset_t *m;
+/*
+/*	int	sigaddset(set, signum)
+/*	sigset_t *set;
+/*	int	signum;
+/*
+/*	int	sigprocmask(how, set, old)
+/*	int	how;
+/*	sigset_t *set;
+/*	sigset_t *old;
+/*
+/*	int	sigaction(sig, act, oact)
+/*	int	sig;
+/*	struct sigaction *act;
+/*	struct sigaction *oact;
+/* DESCRIPTION
+/*	These routines emulate the POSIX signal handling interface.
+/* AUTHOR(S)
+/*	Pieter Schoenmakers
+/*	Eindhoven University of Technology
+/*	P.O. Box 513
+/*	5600 MB Eindhoven
+/*	The Netherlands
+/*--*/
+
+/* System library. */
+
+#include "sys_defs.h"
+#include <signal.h>
+#include <errno.h>
+
+/* Utility library.*/
+
+#include "posix_signals.h"
+
+#ifdef MISSING_SIGSET_T
+
+int     sigemptyset(sigset_t *m)
+{
+    return *m = 0;
+}
+
+int     sigaddset(sigset_t *set, int signum)
+{
+    *set |= sigmask(signum);
+    return 0;
+}
+
+int     sigprocmask(int how, sigset_t *set, sigset_t *old)
+{
+    int previous;
+
+    if (how == SIG_BLOCK)
+	previous = sigblock(*set);
+    else if (how == SIG_SETMASK)
+	previous = sigsetmask(*set);
+    else if (how == SIG_UNBLOCK) {
+	int     m = sigblock(0);
+
+	previous = sigsetmask(m & ~*set);
+    } else {
+	errno = EINVAL;
+	return -1;
+    }
+
+    if (old)
+	*old = previous;
+    return 0;
+}
+
+#endif
+
+#ifdef MISSING_SIGACTION
+
+static struct sigaction actions[NSIG] = {};
+
+static int sighandle(int signum)
+{
+    if (signum == SIGCHLD) {
+	/* XXX If the child is just stopped, don't invoke the handler.	 */
+    }
+    actions[signum].sa_handler(signum);
+}
+
+int     sigaction(int sig, struct sigaction *act, struct sigaction *oact)
+{
+    static int initialized = 0;
+
+    if (!initialized) {
+	int     i;
+
+	for (i = 0; i < NSIG; i++)
+	    actions[i].sa_handler = SIG_DFL;
+	initialized = 1;
+    }
+    if (sig <= 0 || sig >= NSIG) {
+	errno = EINVAL;
+	return -1;
+    }
+    if (oact)
+	*oact = actions[sig];
+
+    {
+	struct sigvec mine = {
+	    sighandle, act->sa_mask,
+	    act->sa_flags & SA_RESTART ? SV_INTERRUPT : 0
+	};
+
+	if (sigvec(sig, &mine, NULL))
+	    return -1;
+    }
+
+    actions[sig] = *act;
+    return 0;
+}
+
+#endif