link.2

Unix操作系统minix 2.0源码

.\" Copyright (c) 1980 Regents of the University of California.
.\" All rights reserved.  The Berkeley software License Agreement
.\" specifies the terms and conditions for redistribution.
.\"
.\"	@(#)link.2	6.3 (Berkeley) 8/26/85
.\"
.TH LINK 2 "August 26, 1985"
.UC 4
.SH NAME
link \- make a hard link to a file
.SH SYNOPSIS
.nf
.ft B
#include <unistd.h>

int link(const char *\fIname1\fP, const char *\fIname2\fP)
.fi
.ft R
.SH DESCRIPTION
A hard link
to
.I name1
is created;
the link has the name
.IR name2 .
.I Name1
must exist.
.PP
With hard links,
both
.I name1
and
.I name2
must be in the same file system.
.I Name1
must not be a directory.
Both the old and the new
.I link
share equal access and rights to
the underlying object.
.SH "RETURN VALUE
Upon successful completion, a value of 0 is returned.  Otherwise,
a value of \-1 is returned and
.B errno
is set to indicate the error.
.SH "ERRORS
.B Link
will fail and no link will be created if one or more of the following
are true:
.TP 15
[ENOTDIR]
A component of either path prefix is not a directory.
.TP 15
[ENAMETOOLONG]
A path name exceeds PATH_MAX characters.
.TP 15
[ENOENT]
A component of either path prefix does not exist.
.TP 15
[EACCES]
A component of either path prefix denies search permission.
.TP 15
[EACCES]
The requested link requires writing in a directory with a mode
that denies write permission.
.TP 15
[ELOOP]
Too many symbolic links were encountered in translating one of the pathnames.
(Minix-vmd)
.TP 15
[ENOENT]
The file named by \fIname1\fP does not exist.
.TP 15
[EEXIST]
The link named by \fIname2\fP does exist.
.TP 15
[EPERM]
The file named by \fIname1\fP is a directory and the effective
user ID is not super-user.
.TP 15
[EXDEV]
The link named by \fIname2\fP and the file named by \fIname1\fP
are on different file systems.
.TP 15
[ENOSPC]
The directory in which the entry for the new link is being placed
cannot be extended because there is no space left on the file
system containing the directory.
.ig
.TP 15
[EDQUOT]
The directory in which the entry for the new link
is being placed cannot be extended because the
user's quota of disk blocks on the file system
containing the directory has been exhausted.
..
.TP 15
[EIO]
An I/O error occurred while reading from or writing to 
the file system to make the directory entry.
.TP 15
[EROFS]
The requested link requires writing in a directory on a read-only file
system.
.TP 15
[EFAULT]
One of the pathnames specified
is outside the process's allocated address space.
.SH "SEE ALSO"
.BR symlink (2),
.BR unlink (2).