libsys: various updates

- move system calls for use by services from libminlib into libsys;
- move srv_fork(2) and srv_kill(2) from RS and into libsys;
- replace getprocnr(2) with sef_self(3);
- rename previous getnprocnr(2) to getprocnr(2);
- clean up getepinfo(2);
- change all libsys calls that used _syscall to use _taskcall, so as
  to avoid going through errno to pass errors; this is already how
  most calls work anyway, and many of the calls previously using
  _syscall were already assumed to return the actual error;
- initialize request messages to zero, for future compatibility
  (note that this does not include PCI calls, which are in need of a
  much bigger overhaul, nor kernel calls);
- clean up more of dead DS code as a side effect.

Change-Id: I8788f54c68598fcf58e23486e270c2d749780ebb

servers/rs/main.c

@@ -413,8 +413,8 @@ static int sef_cb_init_fresh(int UNUSED(type), sef_init_info_t *UNUSED(info))
 
       /* Get pid from PM. */
       rp->r_pid = getnpid(rpub->endpoint);
-      if(rp->r_pid == -1) {
-          panic("unable to get pid");
+      if(rp->r_pid < 0) {
+          panic("unable to get pid: %d", rp->r_pid);
       }
   }
 
@@ -433,11 +433,12 @@ static int sef_cb_init_fresh(int UNUSED(type), sef_init_info_t *UNUSED(info))
 
   /* Fork a new RS instance with root:operator. */
   pid = srv_fork(0, 0);
-  if(pid == -1) {
-      panic("unable to fork a new RS instance");
+  if(pid < 0) {
+      panic("unable to fork a new RS instance: %d", pid);
   }
   replica_pid = pid ? pid : getpid();
-  replica_endpoint = getnprocnr(replica_pid);
+  if ((s = getprocnr(replica_pid, &replica_endpoint)) != 0)
+	panic("unable to get replica endpoint: %d", s);
   replica_rp->r_pid = replica_pid;
   replica_rp->r_pub->endpoint = replica_endpoint;
 

servers/rs/manager.c

@@ -210,30 +210,6 @@ void build_cmd_dep(struct rproc *rp)
   rpub->proc_name[len]= '\0';
 }
 
-/*===========================================================================*
- *				 srv_fork				     *
- *===========================================================================*/
-pid_t srv_fork(uid_t reuid, gid_t regid)
-{
-  message m;
-
-  m.m1_i1 = (int) reuid;
-  m.m1_i2 = (int) regid;
-  return _syscall(PM_PROC_NR, SRV_FORK, &m);
-}
-
-/*===========================================================================*
- *				 srv_kill				     *
- *===========================================================================*/
-int srv_kill(pid_t pid, int sig)
-{
-  message m;
-
-  m.m1_i1 = pid;
-  m.m1_i2 = sig;
-  return(_syscall(PM_PROC_NR, SRV_KILL, &m));
-}
-
 /*===========================================================================*
  *				 srv_update				     *
  *===========================================================================*/
@@ -481,14 +457,15 @@ struct rproc *rp;
   if(rs_verbose)
       printf("RS: forking child with srv_fork()...\n");
   child_pid= srv_fork(rp->r_uid, 0);	/* Force group to operator for now */
-  if(child_pid == -1) {
-      printf("RS: srv_fork() failed (error %d)\n", errno);
+  if(child_pid < 0) {
+      printf("RS: srv_fork() failed (error %d)\n", child_pid);
       free_slot(rp);
-      return(errno);
+      return(child_pid);
   }
 
   /* Get endpoint of the child. */
-  child_proc_nr_e = getnprocnr(child_pid);
+  if ((s = getprocnr(child_pid, &child_proc_nr_e)) != 0)
+	panic("unable to get child endpoint: %d", s);
 
   /* There is now a child process. Update the system process table. */
   child_proc_nr_n = _ENDPOINT_P(child_proc_nr_e);
@@ -677,8 +654,8 @@ struct rproc *rp;				/* pointer to service slot */
        */
       setuid(0);
 
-      if (mapdriver(rpub->label, rpub->dev_nr) != OK) {
-          return kill_service(rp, "couldn't map driver", errno);
+      if ((r = mapdriver(rpub->label, rpub->dev_nr)) != OK) {
+          return kill_service(rp, "couldn't map driver", r);
       }
   }
 
@@ -1133,7 +1110,8 @@ static int run_script(struct rproc *rp)
 		exit(1);
 	default:
 		/* Set the privilege structure for the child process. */
-		endpoint = getnprocnr(pid);
+		if ((r = getprocnr(pid, &endpoint)) != 0)
+			panic("unable to get child endpoint: %d", r);
 		if ((r = sys_privctl(endpoint, SYS_PRIV_SET_USER, NULL))
 			!= OK) {
 			return kill_service(rp,"can't set script privileges",r);

servers/rs/proto.h

@@ -34,8 +34,6 @@ int copy_rs_start(endpoint_t src_e, char *src_rs_start, struct rs_start
 int copy_label(endpoint_t src_e, char *src_label, size_t src_len, char
 	*dst_label, size_t dst_len);
 void build_cmd_dep(struct rproc *rp);
-int srv_fork(uid_t reuid, gid_t regid);
-int srv_kill(pid_t pid, int sig);
 int srv_update(endpoint_t src_e, endpoint_t dst_e);
 #define kill_service(rp, errstr, err) \
 	kill_service_debug(__FILE__, __LINE__, rp, errstr, err)