/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ #include "all.h"#include "io.h" Mconf mconf; static voidmconfinit(void){	int nf, pgsize = 0;	ulong size, userpgs = 0, userused = 0;	char *ln, *sl;	char *fields[2];	Biobuf *bp;	Mbank *mbp; 	size = 64*MB;	bp = Bopen("#c/swap", OREAD);	if (bp != nil) {		while ((ln = Brdline(bp, '\n')) != nil) {			ln[Blinelen(bp)-1] = '\0';			nf = tokenize(ln, fields, nelem(fields));			if (nf != 2)				continue;			if (strcmp(fields[1], "pagesize") == 0)				pgsize = atoi(fields[0]);			else if (strcmp(fields[1], "user") == 0) {				sl = strchr(fields[0], '/');				if (sl == nil)					continue;				userpgs = atol(sl+1);				userused = atol(fields[0]);			}		}		Bterm(bp);		if (pgsize > 0 && userpgs > 0)			size = (((userpgs - userused)*3LL)/4)*pgsize;	}	mconf.memsize = size;	mbp = mconf.bank;	mbp->base = 0x10000000;			/* fake addresses */	mbp->limit = mbp->base + size;	mbp++; 	mconf.nbank = mbp - mconf.bank;} ulongmeminit(void){	conf.nmach = 1;	mconfinit();	return mconf.memsize;} /* * based on libthread's threadsetname, but drags in less library code. * actually just sets the arguments displayed. */voidprocsetname(char *fmt, ...){	int fd;	char *cmdname;	char buf[128];	va_list arg; 	va_start(arg, fmt);	cmdname = vsmprint(fmt, arg);	va_end(arg);	if (cmdname == nil)		return;	snprint(buf, sizeof buf, "#p/%d/args", getpid());	if((fd = open(buf, OWRITE)) >= 0){		write(fd, cmdname, strlen(cmdname)+1);		close(fd);	}	free(cmdname);} voidnewproc(void (*f)(void *), void *arg, char *text){	int kid = rfork(RFPROC|RFMEM|RFNOWAIT); 	if (kid < 0)		sysfatal("can't fork: %r");	if (kid == 0) {		procsetname("%s", text);		(*f)(arg);		exits("child returned");	}}