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

include/lib.h

@@ -36,16 +36,6 @@ void _loadname(const char *_name, message *_msgptr);
 int _len(const char *_s);
 void _begsig(int _dummy);
 
-int getprocnr(void);
-int getnprocnr(pid_t pid);
-int getpprocnr(void);
-int _pm_findproc(char *proc_name, int *proc_nr);
-int mapdriver(char *label, int major);
-pid_t getnpid(endpoint_t proc_ep);
-uid_t getnuid(endpoint_t proc_ep);
-gid_t getngid(endpoint_t proc_ep);
-int checkperms(endpoint_t endpt, char *path, size_t size);
-int copyfd(endpoint_t endpt, int fd, int what);
 ssize_t pread64(int fd, void *buf, size_t count, u64_t where);
 ssize_t pwrite64(int fd, const void *buf, size_t count, u64_t where);
 

include/minix/callnr.h

@@ -91,7 +91,6 @@
 #define EXEC_RESTART	102	/* to PM: final part of exec for RS */
 #define GETPROCNR	104	/* to PM */
 #define ISSETUGID	106	/* to PM: ask if process is tainted */
-#define GETEPINFO_O	107	/* to PM: get pid/uid/gid of an endpoint */
 #define UTIMENS		108	/* to FS: [f]utimens(); also [fl]utimes */
 #define FCNTL		109	/* to VFS */
 #define TRUNCATE	110	/* to VFS */

include/minix/com.h

@@ -895,6 +895,20 @@
 #  define COPYFD_TO	1	/* copy file descriptor to remote process */
 #  define COPYFD_CLOSE	2	/* close file descriptor in remote process */
 
+/* Field names for the getprocnr(2) call. */
+#define PM_GETPROCNR_PID	m1_i1
+#define PM_GETPROCNR_ENDPT	m1_i1
+
+/* Field names for the getepinfo(2) call. */
+#define PM_GETEPINFO_ENDPT	m1_i1
+#define PM_GETEPINFO_UID	m1_i1
+#define PM_GETEPINFO_GID	m1_i2
+
+/* Field names for the mapdriver(2) call. */
+#define VFS_MAPDRIVER_MAJOR	m1_i1
+#define VFS_MAPDRIVER_LABELLEN	m1_i2
+#define VFS_MAPDRIVER_LABEL	m1_p1
+
 /* Field names for GETRUSAGE related calls */
 #define RU_ENDPT	m1_i1	/* indicates a process for sys_getrusage */
 #define RU_WHO		m1_i1	/* who argument in getrusage call */

include/minix/ds.h

@@ -23,9 +23,6 @@
 #define DSF_OVERWRITE		0x01000	/* overwrite if entry exists */
 #define DSF_INITIAL		0x02000	/* check subscriptions immediately */
 
-#define DSMF_COPY_MAPPED	0x20000	/* copy mapped memory range */
-#define DSMF_COPY_SNAPSHOT	0x40000	/* copy snapshot */
-
 /* DS constants. */
 #define DS_MAX_KEYLEN 80        /* Max length of a key, including '\0'. */
 

include/minix/sef.h

@@ -8,6 +8,7 @@
 /* SEF entry points for system processes. */
 void sef_startup(void);
 int sef_receive_status(endpoint_t src, message *m_ptr, int *status_ptr);
+endpoint_t sef_self(void);
 void sef_cancel(void);
 void sef_exit(int status);
 #define sef_receive(src, m_ptr) sef_receive_status(src, m_ptr, NULL)

include/minix/syslib.h

@@ -26,7 +26,6 @@ struct rusage;
  *==========================================================================*/ 
 int _taskcall(endpoint_t who, int syscallnr, message *msgptr);
 int _kernel_call(int syscallnr, message *msgptr);
-int _sendcall(endpoint_t who, int type, message *msgptr);
 
 int sys_abort(int how);
 int sys_enable_iop(endpoint_t proc_ep);
@@ -261,5 +260,16 @@ int sys_setmcontext(endpoint_t proc, mcontext_t *mcp);
 /* input */
 int tty_input_inject(int type, int code, int val);
 
+/* Miscellaneous calls from servers and drivers. */
+pid_t srv_fork(uid_t reuid, gid_t regid);
+int srv_kill(pid_t pid, int sig);
+int getprocnr(pid_t pid, endpoint_t *proc_ep);
+int mapdriver(char *label, devmajor_t major);
+pid_t getnpid(endpoint_t proc_ep);
+uid_t getnuid(endpoint_t proc_ep);
+gid_t getngid(endpoint_t proc_ep);
+int checkperms(endpoint_t endpt, char *path, size_t size);
+int copyfd(endpoint_t endpt, int fd, int what);
+
 #endif /* _SYSLIB_H */