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

lib/libminlib/Makefile

@@ -30,11 +30,6 @@ SRCS+= servxcheck.c
 # queryparam
 SRCS+= paramvalue.c
 
-# Minix servers/drivers syscall. FIXME: these should be moved into libsys.
-SRCS+= 	checkperms.c copyfd.c getngid.c getnpid.c getnprocnr.c getnucred.c \
-	getnuid.c getprocnr.c mapdriver.c vm_memctl.c vm_set_priv.c \
-	vm_query_exit.c vm_update.c
-
 SRCS+= oneC_sum.c
 
 SUBDIR+= pkgconfig

lib/libminlib/checkperms.c

@@ -1,27 +0,0 @@
-#include <lib.h>
-#include <unistd.h>
-#include <string.h>
-#include <minix/safecopies.h>
-
-int
-checkperms(endpoint_t endpt, char *path, size_t size)
-{
-	cp_grant_id_t grant;
-	message m;
-	int r;
-
-	if ((grant = cpf_grant_direct(VFS_PROC_NR, (vir_bytes) path, size,
-	    CPF_READ | CPF_WRITE)) == GRANT_INVALID)
-		return -1;	/* called function sets errno */
-
-	memset(&m, 0, sizeof(m));
-	m.VFS_CHECKPERMS_ENDPT = endpt;
-	m.VFS_CHECKPERMS_GRANT = grant;
-	m.VFS_CHECKPERMS_COUNT = size;
-
-	r = _syscall(VFS_PROC_NR, VFS_CHECKPERMS, &m);
-
-	cpf_revoke(grant);	/* does not touch errno */
-
-	return r;
-}

lib/libminlib/copyfd.c

@@ -1,15 +0,0 @@
-#include <lib.h>
-#include <string.h>
-
-int
-copyfd(endpoint_t endpt, int fd, int what)
-{
-	message m;
-
-	memset(&m, 0, sizeof(m));
-	m.VFS_COPYFD_ENDPT = endpt;
-	m.VFS_COPYFD_FD = fd;
-	m.VFS_COPYFD_WHAT = what;
-
-	return _syscall(VFS_PROC_NR, COPYFD, &m);
-}

lib/libminlib/getngid.c

@@ -1,10 +0,0 @@
-#include <lib.h>
-#include <unistd.h>
-
-gid_t getngid(endpoint_t proc_ep)
-{
-  message m;
-  m.m1_i1 = proc_ep;		/* search gid for this process */
-  if (_syscall(PM_PROC_NR, GETEPINFO, &m) < 0) return ( (gid_t) -1);
-  return( (gid_t) m.m2_i2);	/* return search result */
-}

lib/libminlib/getnpid.c

@@ -1,9 +0,0 @@
-#include <lib.h>
-#include <unistd.h>
-
-pid_t getnpid(endpoint_t proc_ep)
-{
-  message m;
-  m.m1_i1 = proc_ep;		/* search pid for this process */
-  return _syscall(PM_PROC_NR, GETEPINFO, &m);
-}

lib/libminlib/getnprocnr.c

@@ -1,14 +0,0 @@
-#include <lib.h>
-#include <unistd.h>
-
-
-int getnprocnr(pid_t pid)
-{
-  message m;
-  int t = GETPROCNR;
-  m.m1_i1 = pid;		/* pass pid >=0 to search for */
-  m.m1_i2 = 0;			/* don't pass name to search for */
-  if (_syscall(PM_PROC_NR, t, &m) < 0) return(-1);
-  return(m.m1_i1);		/* return search result */
-}
-

lib/libminlib/getnucred.c

@@ -1,32 +0,0 @@
-#include <errno.h>
-#include <lib.h>
-#include <string.h>
-#include <unistd.h>
-
-#include <sys/ucred.h>
-
-int 
-getnucred(endpoint_t proc_ep, struct uucred *ucred)
-{
-	message m;
-	pid_t pid;
-
-	if (ucred == NULL) {
-		errno = EFAULT;
-		return -1;
-	}
-
-	m.m1_i1 = proc_ep;		/* search for this process */
-
-	pid = _syscall(PM_PROC_NR, GETEPINFO, &m);
-	if (pid < 0) {
-		 return -1;
-	}
-
-	/* Only two fields are used for now, so ensure the rest is zeroed out. */
-	memset(ucred, 0, sizeof(struct uucred));
-	ucred->cr_uid = m.PM_NUID;
-	ucred->cr_gid = m.PM_NGID;
-
-	return 0;
-}

lib/libminlib/getnuid.c

@@ -1,10 +0,0 @@
-#include <lib.h>
-#include <unistd.h>
-
-uid_t getnuid(endpoint_t proc_ep)
-{
-  message m;
-  m.m1_i1 = proc_ep;		/* search uid for this process */
-  if (_syscall(PM_PROC_NR, GETEPINFO, &m) < 0) return ( (uid_t) -1);
-  return( (uid_t) m.m2_i1);	/* return search result */
-}

lib/libminlib/getprocnr.c

@@ -1,13 +0,0 @@
-#include <lib.h>
-#include <unistd.h>
-
-
-int getprocnr()
-{
-  message m;
-  m.m1_i1 = -1;			/* don't pass pid to search for */
-  m.m1_i2 = 0;			/* don't pass name to search for */
-  if (_syscall(PM_PROC_NR, GETPROCNR, &m) < 0) return(-1);
-  return(m.m1_i1);		/* return own process number */
-}
-

lib/libminlib/mapdriver.c

@@ -1,17 +0,0 @@
-#include <lib.h>
-#include <string.h>
-#include <unistd.h>
-
-
-int mapdriver(label, major)
-char *label;
-int major;
-{
-  message m;
-  m.m2_p1 = label;
-  m.m2_l1 = strlen(label);
-  m.m2_i1 = major;
-  if (_syscall(VFS_PROC_NR, MAPDRIVER, &m) < 0) return(-1);
-  return(0);
-}
-

lib/libminlib/vm_memctl.c

@@ -1,11 +0,0 @@
-#include <lib.h>
-#include <unistd.h>
-
-int vm_memctl(endpoint_t ep, int req)
-{
-	message m;
-	m.VM_RS_CTL_ENDPT = ep;
-	m.VM_RS_CTL_REQ = req;
-
-	return _syscall(VM_PROC_NR, VM_RS_MEMCTL, &m);
-}

lib/libminlib/vm_query_exit.c

@@ -1,33 +0,0 @@
-#define _SYSTEM 1
-#include <lib.h>
-#include <unistd.h>
-#include <string.h>
-
-/* return -1, when the query itself or the processing of query has errors.
- * return 1, when there are more processes waiting to be queried.
- * return 0, when there are no more processes.
- * note that for the return value of 0 and 1, the 'endpt' is set accordingly.
- */
-int vm_query_exit(int *endpt)
-{
-	message m;
-	int r;
-
-	r = _syscall(VM_PROC_NR, VM_QUERY_EXIT, &m);
-	if (r != OK)
-		return -1;
-	if (endpt == NULL)
-		return -1;
-
-	*endpt = m.VM_QUERY_RET_PT;
-	return (m.VM_QUERY_IS_MORE ? 1 : 0);
-}
-
-int vm_watch_exit(endpoint_t ep)
-{
-	message m;
-
-	memset(&m, 0, sizeof(m));
-	m.VM_WE_EP = ep;
-	return _syscall(VM_PROC_NR, VM_WATCH_EXIT, &m);
-}

lib/libminlib/vm_set_priv.c

@@ -1,12 +0,0 @@
-#include <lib.h>
-#include <unistd.h>
-
-int vm_set_priv(endpoint_t ep, void *buf, int sys_proc)
-{
-	message m;
-	m.VM_RS_NR = ep;
-	m.VM_RS_BUF = (long) buf;
-	m.VM_RS_SYS = sys_proc;
-	return _syscall(VM_PROC_NR, VM_RS_SET_PRIV, &m);
-}
-

lib/libminlib/vm_update.c

@@ -1,11 +0,0 @@
-#include <lib.h>
-#include <unistd.h>
-
-int vm_update(endpoint_t src_e, endpoint_t dst_e)
-{
-	message m;
-	m.VM_RS_SRC_ENDPT = src_e;
-	m.VM_RS_DST_ENDPT = dst_e;
-
-	return _syscall(VM_PROC_NR, VM_RS_UPDATE, &m);
-}