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#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;
}
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