MOUNT(2-BSD) RISC/os Reference Manual MOUNT(2-BSD)
NAME
mount - mount file system
SYNOPSIS
#include <sys/mount.h>
int mount(type, dir, MNEWTYPE|flags, data)
char *type;
char *dir;
int flags;
caddrt data;
DESCRIPTION
mount() attaches a file system to a directory. After a suc-
cessful return, references to directory dir will refer to
the root directory on the newly mounted file system. dir is
a pointer to a null-terminated string containing a path
name. dir must exist already, and must be a directory. Its
old contents are inaccessible while the file system is
mounted.
mount() may be invoked only by the super-user.
The flags argument is constructed by the logical OR of the
following bits (defined in <sys/mount.h>):
M_RDONLY mount filesystem read-only.
M_NOSUID ignore set-uid bit on execution.
M_NEWTYPE this flag must always be set.
M_GRPID use BSD file-creation semantics (see
open(2)).
M_REMOUNT change options on an existing mount.
M_NOSUB disallow mounts beneath this filesystem.
Physically write-protected and magnetic tape file systems
must be mounted read-only or errors will occur when access
times are updated, whether or not any explicit write is
attempted.
The type string indicates the type of the filesystem. data
is a pointer to a structure which contains the type specific
arguments to mount. Below is a list of the filesystem types
supported and the type specific arguments to each:
"ffs | ufs | 4.3"
struct ufs_args {
char *fspec; /* Block special file to mount */
Printed 1/15/91 Page 1
MOUNT(2-BSD) RISC/os Reference Manual MOUNT(2-BSD)
};
"nfs"
#include <nfs/nfs.h>
#include <netinet/in.h>
struct nfs_args {
struct sockaddr_in *addr; /* file server address */
fhandle_t *fh; /* File handle to be mounted */
int flags; /* flags */
int wsize; /* write size in bytes */
int rsize; /* read size in bytes */
int timeo; /* initial timeout in .1 secs */
int retrans; /* times to retry send */
char *hostname; /* server's hostname */
int acregmin; /* attr cache file min secs */
int acregmax; /* attr cache file max secs */
int acdirmin; /* attr cache dir min secs */
int acdirmax; /* attr cache dir max secs */
char *netname; /* server's netname */
};
RETURN VALUE
Upon successful completion a value of 0 is returned. Other-
wise, a value of -1 is returned and errno is set to indicate
the error.
ERRORS
mount() fails when one of the following occurs:
EPERM The caller is not the super-user.
ENODEV The file system type specified by type is not
valid or is not configured into the system.
ENAMETOOLONG The length of a component of the path name of
dir exceeds 255 characters, or the length of
the entire path name of dir exceeds 1023
characters.
ENOENT A component of dir does not exist.
EACCES Search permission is denied for a component
of the path prefix of dir.
ENOTDIR The file named by dir is not a directory.
EBUSY Another process currently holds a reference
to dir.
EFAULT dir points outside the process's allocated
address space.
Page 2 Printed 1/15/91
MOUNT(2-BSD) RISC/os Reference Manual MOUNT(2-BSD)
ELOOP Too many symbolic links were encountered in
translating the path name of dir.
ENOTBLK fspec is not a block device.
ENXIO The major device number of fspec is out of
range (this indicates no device driver exists
for the associated hardware).
EMFILE No space remains in the mount table.
EINVAL The super block for the file system had a bad
magic number or an out of range block size.
ENOMEM Not enough memory was available to read the
cylinder group information for the file sys-
tem.
ENOTDIR A component of the path prefix of fspec is
not a directory.
EIO An I/O error occurred while reading from or
writing to the file system.
SEE ALSO
unmount(2-BSD), open(2).
mount(1M) in the System Administrator's Reference Manual.
WARNING
Some of the error codes need translation to more obvious
messages.
Printed 1/15/91 Page 3