LINK.2
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操作系统开发
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C/C++
- ." 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 *fIname1fP, const char *fIname2fP)
- .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 fIname1fP does not exist.
- .TP 15
- [EEXIST]
- The link named by fIname2fP does exist.
- .TP 15
- [EPERM]
- The file named by fIname1fP is a directory and the effective
- user ID is not super-user.
- .TP 15
- [EXDEV]
- The link named by fIname2fP and the file named by fIname1fP
- 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).