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Add fairly minimal documentation for the nmount() syscall.

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This commit is contained in:
Tim J. Robbins 2004-03-16 09:45:38 +00:00
parent 7b0d017245
commit be0f84026d
2 changed files with 35 additions and 3 deletions
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2
lib/libc/sys/Makefile.inc
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@ -124,7 +124,7 @@ MLINKS+=madvise.2 posix_madvise.2
MLINKS+=mlock.2 munlock.2
MLINKS+=mlockall.2 munlockall.2
MLINKS+=modnext.2 modfnext.2
MLINKS+=mount.2 unmount.2
MLINKS+=mount.2 unmount.2 mount.2 nmount.2
MLINKS+=pathconf.2 fpathconf.2
MLINKS+=read.2 pread.2 read.2 readv.2
MLINKS+=recv.2 recvfrom.2 recv.2 recvmsg.2

36
lib/libc/sys/mount.2
View file

@ -32,11 +32,12 @@
.\" @(#)mount.2 8.3 (Berkeley) 5/24/95
.\" $FreeBSD$
.\"
.Dd September 8, 2003
.Dd March 16, 2004
.Dt MOUNT 2
.Os
.Sh NAME
.Nm mount ,
.Nm nmount ,
.Nm unmount
.Nd mount or dismount a file system
.Sh LIBRARY
@ -48,6 +49,9 @@
.Fn mount "const char *type" "const char *dir" "int flags" "void *data"
.Ft int
.Fn unmount "const char *dir" "int flags"
.In sys/uio.h
.Ft int
.Fn nmount "struct iovec *iov" "u_int niov" "int flags"
.Sh DESCRIPTION
The
.Fn mount
@ -74,6 +78,32 @@ at the time
of a successful mount are swept under the carpet so to speak, and
are unavailable until the file system is unmounted.
.Pp
The
.Fn nmount
system call behaves similarly to
.Fn mount ,
except that the mount options (filesystem type name, device to mount,
mount-point name, etc.) are passed as an array of name-value pairs
in the array
.Fa iov ,
containing
.Fa niov
elements.
The following options are required by all filesystems:
.Bl -item -offset indent -compact
.It
.Li fstype Ta filesystem type name (e.g. Dq Li procfs )
.It
.Li fspath Ta mount point pathname (e.g. Dq Li /proc )
.El
.Pp
Depending on the filesystem type, other options may be
recognized or required;
for example, most disk-based filesystems require a
.Dq Li from
option containing the pathname of a special device
in addition to the options listed above.
.Pp
By default only the super-user may call the
.Fn mount
system call.
@ -204,7 +234,9 @@ The file system that has the specified file system ID will be unmounted.
.Sh ERRORS
The
.Fn mount
system call will fail when one of the following occurs:
and
.Fn nmount
system calls will fail when one of the following occurs:
.Bl -tag -width Er
.It Bq Er EPERM
The caller is neither the super-user nor the owner of