Squash commits for public release

libs/libc/posix/signal.c

@@ -0,0 +1,26 @@
+#include <signal.h>
+#include <sysdep.h>
+#include <unistd.h>
+
+int sigaction(int signo, sighandler_t callback)
+{
+    int res = DO_SYSCALL_2(SYS_SIGACTION, signo, callback);
+    RETURN_WITH_ERRNO(res, 0, -1);
+}
+
+sighandler_t signal(int signo, sighandler_t callback)
+{
+    sigaction(signo, callback);
+    return SIG_DFL;
+}
+
+int raise(int signo)
+{
+    return kill(getpid(), signo);
+}
+
+int kill(pid_t pid, int signo)
+{
+    int res = DO_SYSCALL_2(SYS_KILL, pid, signo);
+    RETURN_WITH_ERRNO(res, 0, -1);
+}