DragonFlyBSD

.\" SUCH DAMAGE.

.\"

.\"     @(#)open.2	8.2 (Berkeley) 11/16/93

.\"

.Dt OPEN 2

.Os

.Sh NAME

O_DIRECT	eliminate or reduce cache effects

O_FSYNC		synchronous writes

O_NOFOLLOW	do not follow symlinks

.Ed

.Pp

Opening a file with

it will minimize the impact the data has on the cache.

Use of this flag can drastically reduce performance if not used with care.

.Pp

If successful,

.Fn open

and

When a new file is created it is given the group of the directory

which contains it.

.Pp

.Xr execve 2

system calls; see

and

.Pp

The system imposes a limit on the number of file descriptors

open simultaneously by one process.

 * MPSAFE

 */

int

{

	static struct timeval lastfail;

	static int curfail;

	fp->f_ops = &badfileops;

	fp->f_seqcount = 1;

	fsetcred(fp, cred);

	spin_lock(&filehead_spin);

	nfiles++;

	LIST_INSERT_HEAD(&filehead, fp, f_list);

	return (error);

}

/*

 * Check for races against a file descriptor by determining that the

 * file pointer is still associated with the specified file descriptor,

	if ((oflags & O_ACCMODE) == O_ACCMODE)

		return (EINVAL);

	flags = FFLAGS(oflags);

	if (error)

		return (error);

	fp = nfp;

	 * WARNING! no f_nchandle will be associated when fhopen()ing a

	 * directory.  XXX

	 */

		goto bad;

	fp = nfp;

/* Defined by POSIX 1003.1; BSD default, but must be distinct from O_RDONLY. */

#define	O_NOCTTY	0x8000		/* don't assign controlling terminal */

/* Attempt to bypass the buffer cache */

#define O_DIRECT	0x00010000

int	dupfdopen (struct filedesc *, int, int, int, int);

int	fdalloc (struct proc *p, int want, int *result);

int	fdavail (struct proc *p, int n);

int	falloc (struct lwp *lp, struct file **resultfp, int *resultfd);

void	fsetfd (struct filedesc *fdp, struct file *fp, int fd);

int	fgetfdflags(struct filedesc *fdp, int fd, int *flagsp);