UNLINK.2
资源名称:os_source.zip [点击查看]
上传用户:datang2001
上传日期:2007-02-01
资源大小:53269k
文件大小:2k
源码类别:
操作系统开发
开发平台:
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.
- ."
- ." @(#)unlink.2 6.2 (Berkeley) 5/22/85
- ."
- .TH UNLINK 2 "May 22, 1985"
- .UC 4
- .SH NAME
- unlink - remove directory entry
- .SH SYNOPSIS
- .nf
- .ft B
- #include <unistd.h>
- int unlink(const char *path)
- .fi
- .ft R
- .SH DESCRIPTION
- .B Unlink
- removes the entry for the file
- .I path
- from its directory.
- If this entry was the last link to the file,
- and no process has the file open, then
- all resources associated with the file are reclaimed.
- If, however, the file was open in any process, the actual
- resource reclamation is delayed until it is closed,
- even though the directory entry has disappeared.
- .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
- The fIunlinkfP succeeds unless:
- .TP 15
- [ENOTDIR]
- A component of the path prefix is not a directory.
- .TP 15
- [ENAMETOOLONG]
- The path name exceeds PATH_MAX characters.
- .TP 15
- [ENOENT]
- The named file does not exist.
- .TP 15
- [EACCES]
- Search permission is denied for a component of the path prefix.
- .TP 15
- [EACCES]
- Write permission is denied on the directory containing the link
- to be removed.
- .TP 15
- [ELOOP]
- Too many symbolic links were encountered in translating the pathname.
- (Minix-vmd)
- .TP 15
- [EPERM]
- The named file is a directory.
- .TP 15
- [EPERM]
- The directory containing the file is marked sticky,
- and neither the containing directory nor the file to be removed
- are owned by the effective user ID.
- (Minix-vmd)
- .TP 15
- [EBUSY]
- The entry to be unlinked is the mount point for a
- mounted file system.
- .TP 15
- [EIO]
- An I/O error occurred while deleting the directory entry
- or deallocating the inode.
- .TP 15
- [EROFS]
- The named file resides on a read-only file system.
- .TP 15
- [EFAULT]
- .I Path
- points outside the process's allocated address space.
- .SH "SEE ALSO"
- .BR close (2),
- .BR link (2),
- .BR rmdir (2).