mount()

Mount a filesystem

Synopsis:

#include <sys/mount.h>

int mount( const char* spec, 
           const char* dir, 
           int flags, 
           const char* type, 
           const void* data, 
           int datalen );

Library:

libc

Description:

The mount() function sends a request to servers to mount the services provided by spec and type at dir. The parameters are:

spec

Null-terminated string describing a special device (e.g. /dev/hd0t77).

dir

Null-terminated string with the directory to be mounted (e.g. /mnt/home).

flags

A flag that's passed to the driver:

_MOUNT_READONLY

Mark the filesystem mountpoint as read-only.

_MOUNT_NOEXEC

Don't allow executables to load.

_MOUNT_NOSUID

Don't honor setuid bits on the filesystem.

_MOUNT_NOCREAT

Don't allow file creation on the filesystem.

_MOUNT_OFF32

Limit off_t to 32 bits.

_MOUNT_NOATIME

Disable logging of file access times.

_MOUNT_BEFORE

Call resmgr_attach() with RESMGR_FLAG_BEFORE.

_MOUNT_AFTER

Call resmgr_attach() with RESMGR_FLAG_AFTER.

_MOUNT_OPAQUE

Call resmgr_attach() with RESMGR_FLAG_OPAQUE.

_MOUNT_UNMOUNT

Unmount this path.

_MOUNT_REMOUNT

This path is already mounted, perform an update.

_MOUNT_FORCE

Force an unmount or a remount change.

_MOUNT_ENUMERATE

Auto-detect on this device.

type

Null-terminated string with the filesystem type (e.g. "nfs", "cifs", "qnx4", "ext2", "network").

data

A pointer to additional data to be sent to the manager. If datalen is <0 the data points to a null-terminated string.

datalen

Length of the data in bytes that's being sent to the server or <0 if the data is a null-terminated string.

If _MFLAG_OCB is passed to mount() as part of the flags then the special device string is passed and all servers are contacted. If it isn't passed as part of the flags and the special device spec exists, then only the server that created that device is contacted and the fullpath to spec is provided.

If datalen is any value <0 then it is assumed that if there is a data pointer that it is a pointer to a string.

NULL is a valid spec value if there is no special device.

Returns:

-1 on failure; no server supports the request (errno is set).

Classification:

QNX 6

See also:

resmgr_attach(), umount()

Writing a Resource Manager in Programmer's Guide