Subversion Repositories planix.SVN

#include <u.h>

#include <libc.h>

#include "compat.h"

typedef struct Exporter	Exporter;

struct Exporter

{

	int	fd;

	Chan	**roots;

	int	nroots;

};

int

mounter(char *mntpt, int how, int fd, int n)

{

	char buf[32];

	int i, ok, mfd;

	ok = 1;

	for(i = 0; i < n; i++){

		snprint(buf, sizeof buf, "%d", i);

		mfd = dup(fd, -1);

		if(mount(mfd, -1, mntpt, how, buf) == -1){

			close(mfd);

			fprint(2, "can't mount on %s: %r\n", mntpt);

			ok = 0;

			break;

		}

		close(mfd);

		if(how == MREPL)

			how = MAFTER;

	}

	close(fd);

	return ok;

}

static void

extramp(void *v)

{

	Exporter *ex;

	rfork(RFNAMEG);

	ex = v;

	sysexport(ex->fd, ex->roots, ex->nroots);

	shutdown();

	exits(nil);

}

int

exporter(Dev **dt, int *fd, int *sfd)

{

	Chan **roots;

	Exporter ex;

	int p[2], i, n, ed;

	for(n = 0; dt[n] != nil; n++)

		;

	if(!n){

		werrstr("no devices specified");

		return 0;

	}

	ed = errdepth(-1);

	if(waserror()){

		werrstr(up->error);

		return 0;

	}

	roots = smalloc(n * sizeof *roots);

	for(i = 0; i < n; i++){

		(*dt[i]->reset)();

		(*dt[i]->init)();

		roots[i] = (*dt[i]->attach)("");

	}

	poperror();

	errdepth(ed);

	if(pipe(p) < 0){

		werrstr("can't make pipe: %r");

		return 0;

	}

	*sfd = p[0];

	*fd = p[1];

	ex.fd = *sfd;

	ex.roots = roots;

	ex.nroots = n;

	kproc("exporter", extramp, &ex);

	return n;

}