132 lines
3.2 KiB
Groff
132 lines
3.2 KiB
Groff
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.\" Copyright (c) 1980 Regents of the University of California.
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.\" All rights reserved. The Berkeley software License Agreement
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.\" specifies the terms and conditions for redistribution.
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.\"
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.\" @(#)mknod.2 6.4 (Berkeley) 5/23/86
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.\"
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.TH MKNOD 2 "May 23, 1986"
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.UC 4
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.SH NAME
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mknod, mkfifo \- make a special file
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.SH SYNOPSIS
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.nf
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.ft B
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#include <sys/types.h>
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#include <unistd.h>
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#include <sys/stat.h>
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int mknod(const char *\fIpath\fP, mode_t \fImode\fP, dev_t \fIdev\fP)
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int mkfifo(const char *\fIpath\fP, mode_t \fImode\fP)
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.fi
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.ft R
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.SH DESCRIPTION
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.B Mknod
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creates a new file
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whose name is
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.I path.
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The mode of the new file
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(including special file bits)
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is initialized from
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.IR mode ,
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as defined in
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.IR <sys/stat.h> .
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(The protection part of the mode
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is modified by the process's mode mask (see
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.BR umask (2))).
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The first block pointer of the i-node
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is initialized from
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.I dev
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and is used to specify which device the special file
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refers to.
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.PP
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If mode indicates a block or character special file,
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.I dev
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is the device number of a character or block I/O device.
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The low eight bits of the device number hold the minor device number
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that selects a device among the devices governed by the same driver.
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The driver is selected by the major device number, the next eight bits
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of the device number.
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.PP
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If
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.I mode
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does not indicate a block special or character special device,
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.I dev
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is ignored.
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(For example, when creating a ``fifo'' special file.)
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.PP
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.B Mknod
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may be invoked only by the super-user,
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unless it is being used to create a fifo.
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.PP
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The call
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.BI "mkfifo(" path ", " mode ")"
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is equivalent to
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.PP
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.RS
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.BI "mknod(" path ", (" mode " & 0777) | S_IFIFO, 0)"
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.RE
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.SH "RETURN VALUE
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Upon successful completion a value of 0 is returned.
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Otherwise, a value of \-1 is returned and \fBerrno\fP
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is set to indicate the error.
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.SH ERRORS
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.B Mknod
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will fail and the file mode will be unchanged if:
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.TP 15
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[ENOTDIR]
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A component of the path prefix is not a directory.
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.TP 15
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[ENAMETOOLONG]
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The path name exceeds PATH_MAX characters.
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.TP 15
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[ENOENT]
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A component of the path prefix does not exist.
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.TP 15
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[EACCES]
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Search permission is denied for a component of the path prefix.
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.TP 15
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[ELOOP]
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Too many symbolic links were encountered in translating the pathname.
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(Minix-vmd)
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.TP 15
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[EPERM]
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The process's effective user ID is not super-user.
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.TP 15
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[EIO]
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An I/O error occurred while making the directory entry or allocating the inode.
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.TP 15
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[ENOSPC]
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The directory in which the entry for the new node is being placed
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cannot be extended because there is no space left on the file
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system containing the directory.
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.TP 15
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[ENOSPC]
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There are no free inodes on the file system on which the
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node is being created.
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.ig
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.TP 15
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[EDQUOT]
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The directory in which the entry for the new node
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is being placed cannot be extended because the
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user's quota of disk blocks on the file system
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containing the directory has been exhausted.
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.TP 15
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[EDQUOT]
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The user's quota of inodes on the file system on
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which the node is being created has been exhausted.
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..
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.TP 15
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[EROFS]
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The named file resides on a read-only file system.
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.TP 15
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[EEXIST]
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The named file exists.
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.TP 15
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[EFAULT]
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.I Path
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points outside the process's allocated address space.
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.SH "SEE ALSO"
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.BR chmod (2),
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.BR stat (2),
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.BR umask (2).
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