示例#1
0
文件: sysfile.c 项目: 7perl/akaros
int newfd(struct chan *c)
{
	int i;
	struct fgrp *f = current->fgrp;

	spin_lock(&f->lock);
	if (f->closed) {
		spin_unlock(&f->lock);
		return -1;
	}
	/* VFS hack */
	/* We'd like to ask it to start at f->minfd, but that would require us to
	 * know if we closed anything.  Since we share the FD numbers with the VFS,
	 * there is no way to know that. */
#if 1	// VFS hack
	i = get_fd(&current->open_files, 0);
#else 	// 9ns style
	/* TODO: use a unique integer allocator */
	for (i = f->minfd; i < f->nfd; i++)
		if (f->fd[i] == 0)
			break;
#endif
	if (growfd(f, i) < 0) {
		spin_unlock(&f->lock);
		return -1;
	}
	assert(f->fd[i] == 0);
	f->minfd = i + 1;
	if (i > f->maxfd)
		f->maxfd = i;
	f->fd[i] = c;
	spin_unlock(&f->lock);
	return i;
}
示例#2
0
文件: sysfile.c 项目: Shamar/harvey
/*
 *  this assumes that the fgrp is locked
 */
static int
findfreefd(Fgrp *f, int start)
{
	int fd;

	for(fd=start; fd<f->nfd; fd++)
		if(f->fd[fd] == 0)
			break;
	if(fd >= f->nfd && growfd(f, fd) < 0)
		return -1;
	return fd;
}
示例#3
0
文件: sysfile.c 项目: Shamar/harvey
void
sysdup(Ar0* ar0, ...)
{
	Proc *up = externup();
	int nfd, ofd;
	Chan *nc, *oc;
	Fgrp *f;
	va_list list;
	va_start(list, ar0);

	/*
	 * int dup(int oldfd, int newfd);
	 *
	 * Close after dup'ing, so date > #d/1 works
	 */
	ofd = va_arg(list, int);
	oc = fdtochan(ofd, -1, 0, 1);
	nfd = va_arg(list, int);
	va_end(list);

	if(nfd != -1){
		f = up->fgrp;
		lock(&f->r.l);
		if(nfd < 0 || growfd(f, nfd) < 0) {
			unlockfgrp(f);
			cclose(oc);
			error(Ebadfd);
		}
		if(nfd > f->maxfd)
			f->maxfd = nfd;

		nc = f->fd[nfd];
		f->fd[nfd] = oc;
		unlockfgrp(f);
		if(nc != nil)
			cclose(nc);
	}else{
		if(waserror()) {
			cclose(oc);
			nexterror();
		}
		nfd = newfd(oc);
		if(nfd < 0)
			error(Enofd);
		poperror();
	}

	ar0->i = nfd;
}
示例#4
0
文件: sysfile.c 项目: Akheon23/nix-os
long
sysdup(ulong *arg)
{
	int fd;
	Chan *c, *oc;
	Fgrp *f = up->fgrp;

	/*
	 * Close after dup'ing, so date > #d/1 works
	 */
	c = fdtochan(arg[0], -1, 0, 1);
	fd = arg[1];
	if(fd != -1){
		lock(f);
		if(fd<0 || growfd(f, fd)<0) {
			unlockfgrp(f);
			cclose(c);
			error(Ebadfd);
		}
		if(fd > f->maxfd)
			f->maxfd = fd;

		oc = f->fd[fd];
		f->fd[fd] = c;
		unlockfgrp(f);
		if(oc)
			cclose(oc);
	}else{
		if(waserror()) {
			cclose(c);
			nexterror();
		}
		fd = newfd(c);
		if(fd < 0)
			error(Enofd);
		poperror();
	}

	return fd;
}
示例#5
0
文件: sysfile.c 项目: 8l/inferno
int
newfd(Chan *c)
{
	int i;
	Fgrp *f = up->env->fgrp;

	lock(f);
	for(i=f->minfd; i<f->nfd; i++)
		if(f->fd[i] == 0)
			break;
	if(i >= f->nfd && growfd(f, i) < 0){
		unlock(f);
		exhausted("file descriptors");
		return -1;
	}
	f->minfd = i + 1;
	if(i > f->maxfd)
		f->maxfd = i;
	f->fd[i] = c;
	unlock(f);
	return i;
}