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kern: remove per-process information from devcons

Devcons has no business poking at the process state.

The following files are being removed:

#c/cputime
#c/pgrpid
#c/pid
#c/ppid
#c/user

--- a/kern/dat.h

+++ b/kern/dat.h

@@ -162,7 +162,6 @@

 	Mnt*	mux;			/* Mnt for clients using me for messages */

 	union {

 		void*	aux;

-		Qid	pgrpid;		/* for #p/notepg */

 		ulong	mid;		/* for ns in devproc */

 	};

 	Chan*	mchan;			/* channel to mounted server */

@@ -293,7 +292,6 @@

 {

 	Ref ref;				/* also used as a lock when mounting */

 	int	noattach;

-	ulong	pgrpid;

 	QLock	debug;			/* single access via devproc.c */

 	RWlock	ns;			/* Namespace n read/one write lock */

 	Mhead	*mnthash[MNTHASH];

@@ -355,7 +353,6 @@

 	uint	mach;

 	ulong	pid;

-	ulong	parentpid;

 	Pgrp	*pgrp;		/* Process group for namespace */

 	Fgrp	*fgrp;		/* File descriptor group */

--- a/kern/devcons.c

+++ b/kern/devcons.c

@@ -331,7 +331,6 @@

 	Qbintime,

 	Qcons,

 	Qconsctl,

-	Qcputime,

 	Qdrivers,

 	Qkmesg,

 	Qkprint,

@@ -339,9 +338,6 @@

 	Qhostowner,

 	Qnull,

 	Qosversion,

-	Qpgrpid,

-	Qpid,

-	Qppid,

 	Qrandom,

 	Qreboot,

 	Qshowfile,

@@ -349,7 +345,6 @@

 	Qsysname,

 	Qsysstat,

 	Qtime,

-	Quser,

 	Qzero,

 };

@@ -363,7 +358,6 @@

 	"bintime",	{Qbintime},	24,		0664,

 	"cons",		{Qcons},	0,		0660,

 	"consctl",	{Qconsctl},	0,		0220,

-	"cputime",	{Qcputime},	6*NUMSIZE,	0444,

 	"drivers",	{Qdrivers},	0,		0444,

 	"hostdomain",	{Qhostdomain},	DOMLEN,		0664,

 	"hostowner",	{Qhostowner},	0,	0664,

@@ -371,9 +365,6 @@

 	"kprint",	{Qkprint, 0, QTEXCL},	0,	DMEXCL|0440,

 	"null",		{Qnull},	0,		0666,

 	"osversion",	{Qosversion},	0,		0444,

-	"pgrpid",	{Qpgrpid},	NUMSIZE,	0444,

-	"pid",		{Qpid},		NUMSIZE,	0444,

-	"ppid",		{Qppid},	NUMSIZE,	0444,

 	"random",	{Qrandom},	0,		0444,

 	"reboot",	{Qreboot},	0,		0664,

 	"showfile",	{Qshowfile},	0,	0220,

@@ -381,7 +372,6 @@

 	"sysname",	{Qsysname},	0,		0664,

 	"sysstat",	{Qsysstat},	0,		0666,

 	"time",		{Qtime},	NUMSIZE+3*VLNUMSIZE,	0664,

-	"user",		{Quser},	0,	0666,

 	"zero",		{Qzero},	0,		0444,

 };

@@ -588,9 +578,6 @@

 		poperror();

 		return n;

-	case Qcputime:

-		return 0;

-

 	case Qkmesg:

 		/*

 		 * This is unlocked to avoid tying up a process

@@ -610,15 +597,6 @@

 	case Qkprint:

 		return qread(kprintoq, buf, n);

-	case Qpgrpid:

-		return readnum((ulong)offset, buf, n, up->pgrp->pgrpid, NUMSIZE);

-

-	case Qpid:

-		return readnum((ulong)offset, buf, n, up->pid, NUMSIZE);

-

-	case Qppid:

-		return readnum((ulong)offset, buf, n, up->parentpid, NUMSIZE);

-

 	case Qtime:

 		return readtime((ulong)offset, buf, n);

@@ -631,9 +609,6 @@

 	case Qhostdomain:

 		return readstr((ulong)offset, buf, n, hostdomain);

-	case Quser:

-		return readstr((ulong)offset, buf, n, up->user);

-

 	case Qnull:

 		return 0;

@@ -760,9 +735,6 @@

 	case Qhostdomain:

 		return hostdomainwrite(a, n);

-

-	case Quser:

-		return userwrite(a, n);

 	case Qnull:

 		break;

--- a/kern/fns.h

+++ b/kern/fns.h

@@ -204,7 +204,6 @@

 Block*		trimblock(Block*, int, int);

 long		unionread(Chan*, void*, long);

 void		unlock(Lock*);

-long		userwrite(char*, int);

 #define	validaddr(a, b, c)

 void		validname(char*, int);

 char*		validnamedup(char*, int);

--- a/kern/pgrp.c

+++ b/kern/pgrp.c

@@ -4,7 +4,6 @@

 #include	"fns.h"

 #include	"error.h"

-static Ref pgrpid;

 static Ref mountid;

 Pgrp*

@@ -14,7 +13,6 @@

 	p = smalloc(sizeof(Pgrp));

 	p->ref.ref = 1;

-	p->pgrpid = incref(&pgrpid);

 	return p;

 }

--- a/kern/stub.c

+++ b/kern/stub.c

@@ -28,13 +28,6 @@

 	return 0;

 }

-int

-userwrite(char *a, int n)

-{

-	error(Eperm);

-	return 0;

-}

-

 long

 hostdomainwrite(char *a, int n)

 {

--- a/kern/sysfile.c

+++ b/kern/sysfile.c

@@ -1259,3 +1259,9 @@

 	enderror();

 	return n;

 }

+

+int

+sysgetpid(void)

+{

+	return up->pid;

+}

--- a/libc/Makefile

+++ b/libc/Makefile

@@ -35,7 +35,6 @@

 	fprint.$O\

 	getenv.$O\

 	getfields.$O\

-	getpid.$O\

 	lock.$O\

 	mallocz.$O\

 	nan64.$O\

--- a/libc/getpid.c

+++ /dev/null

@@ -1,17 +1,0 @@

-#include	<u.h>

-#include	<libc.h>

-

-int

-getpid(void)

-{

-	char b[20];

-	int f;

-

-	memset(b, 0, sizeof(b));

-	f = open("#c/pid", 0);

-	if(f >= 0) {

-		read(f, b, sizeof(b));

-		close(f);

-	}

-	return atol(b);

-}