posix signals support, 1st pass

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@1623 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/os/kernel/syscalls.h

@@ -60,6 +60,9 @@ status_t sys_get_next_thread_info(team_id team, int32 *cookie, thread_info *info
 status_t sys_get_team_info(team_id id, team_info *info);
 status_t sys_get_next_team_info(int32 *cookie, team_info *info);
 
+int sys_kill(pid_t pid, int sig);
+int sys_sigaction(int sig, const struct sigaction *act, struct sigaction *oact);
+
 region_id sys_vm_create_anonymous_region(const char *name, void **address, int addr_type,
 	addr size, int wiring, int lock);
 region_id sys_vm_clone_region(const char *name, void **address, int addr_type,

headers/os/kernel/thread_types.h

@@ -21,6 +21,7 @@ extern "C" {
 #include <cbuf.h>
 #include <vm.h>
 #include <smp.h>
+#include <signal.h>
 #include <arch/thread_struct.h>
 
 extern spinlock_t thread_spinlock;
@@ -101,7 +102,11 @@ struct thread {
 	int state;
 	int next_state;
 	union cpu_ent *cpu;
-	int pending_signals;
+	
+	sigset_t sig_pending;
+	sigset_t sig_block_mask;
+	struct sigaction sig_action[32];
+	
 	bool in_kernel;
 	sem_id sem_blocking;
 	int sem_count;