static int do_pipe(int *fd)
{
register struct inode *inode;
struct file *f1;
struct file *f2;
int error = -ENOMEM;
int i;
if(!(inode = new_inode(NULL, S_IFIFO | S_IRUSR | S_IWUSR))) /* Create inode */
goto no_inodes;
/* read file */
if((error = open_filp(O_RDONLY, inode, &f1)))
goto no_files;
if ((error = get_unused_fd(f1)) < 0)
goto close_f1;
fd[0] = error;
i = error;
(inode->i_count)++; /* Increase inode usage count */
/* write file */
if((error = open_filp(O_WRONLY, inode, &f2)))
goto close_f1_i;
if ((error = get_unused_fd(f2)) < 0)
goto close_f12;
fd[1] = error;
return 0;
close_f12:
close_filp(inode, f2);
close_f1_i:
current->files.fd[i] = NULL;
inode->i_count--;
close_f1:
close_filp(inode, f1);
no_files:
iput(inode);
no_inodes:
return error;
}
int open_fd(int flags, register struct inode *inode)
{
int fd;
struct file *filp;
if(!(fd = open_filp(flags, inode, &filp))
&& ((fd = get_unused_fd(filp)) < 0))
close_filp(inode, filp);
return fd;
}
int open_fd(int flags, struct inode *inode)
{
int fd;
struct file *f;
register struct file *filp;
if (!(fd = open_filp(flags, inode, &f))) {
filp = f;
filp->f_flags &= ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC);
/*
* We have to do this last, because we mustn't export
* an incomplete fd to other processes which may share
* the same file table with us.
*/
if ((fd = get_unused_fd(filp)) < 0)
close_filp(inode, filp);
}
return fd;
}
int sys_open(char *filename, int flags, int mode)
{
struct inode *inode;
register struct inode *pinode;
struct file *f;
int error, flag;
flag = flags;
if ((mode_t)((flags + 1) & O_ACCMODE))
flag++;
if (flag & (O_TRUNC | O_CREAT))
flag |= FMODE_WRITE;
error = open_namei(filename, flag, mode, &inode, NULL);
if(error)
goto exit_open;
pinode = inode;
error = open_filp(flags, pinode, &f);
if(error)
goto cleanup_inode;
f->f_flags &= ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC);
/*
* We have to do this last, because we mustn't export
* an incomplete fd to other processes which may share
* the same file table with us.
*/
if ((error = get_unused_fd(f)) > -1)
goto exit_open;
close_filp(pinode, f);
cleanup_inode:
iput(pinode);
exit_open:
return error;
}