Subversion Repositories planix.SVN

#include "all.h"

#include "io.h"

Mconf mconf;

static void

mconfinit(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;

}

ulong

meminit(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.

 */

void

procsetname(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);

}

void

newproc(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");

	}

}