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UNLINK(2) FreeBSD System Calls Manual UNLINK(2)
NAME
unlink -- remove directory entry
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <unistd.h>
int
unlink(const char *path);
DESCRIPTION
The unlink() system call removes the link named by path from its direc-
tory and decrements the link count of the file which was referenced by
the link. If that decrement reduces the link count of the file to zero,
and no process has the file open, then all resources associated with the
file are reclaimed. If one or more process have the file open when the
last link is removed, the link is removed, but the removal of the file is
delayed until all references to it have been closed. The path argument
may not be a directory.
RETURN VALUES
The unlink() function returns the value 0 if successful; otherwise the
value -1 is returned and the global variable errno is set to indicate the
error.
ERRORS
The unlink() succeeds unless:
[ENOTDIR] A component of the path prefix is not a directory.
[ENAMETOOLONG] A component of a pathname exceeded 255 characters, or
an entire path name exceeded 1023 characters.
[ENOENT] The named file does not exist.
[EACCES] Search permission is denied for a component of the
path prefix.
[EACCES] Write permission is denied on the directory containing
the link to be removed.
[ELOOP] Too many symbolic links were encountered in translat-
ing the pathname.
[EPERM] The named file is a directory.
[EPERM] The named file has its immutable or append-only flag
set, see the chflags(2) manual page for more informa-
tion.
[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.
[EBUSY] The entry to be unlinked is the mount point for a
mounted file system.
[EIO] An I/O error occurred while deleting the directory
entry or deallocating the inode.
[EROFS] The named file resides on a read-only file system.
[EFAULT] The path argument points outside the process's allo-
cated address space.
SEE ALSO
chflags(2), close(2), link(2), rmdir(2), symlink(7)
HISTORY
The unlink() function appeared in Version 6 AT&T UNIX.
The unlink() system call traditionally allows the super-user to unlink
directories which can damage the file system integrity. This implementa-
tion no longer permits it.
FreeBSD 6.2 February 23, 2005 FreeBSD 6.2
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This page was generated on Wed Sep 19 20:04:15 BST 2007
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