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unlink.2freebsd

BSD mandoc

NAME

unlink - remove directory entry

LIBRARY

Lb libc

SYNOPSIS

In unistd.h Ft int Fn unlink const char *path

DESCRIPTION

The Fn unlink system call removes the link named by Fa path from its directory 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 Fa path argument may not be a directory.

RETURN VALUES

Rv -std unlink

ERRORS

The Fn unlink succeeds unless:

Bq Er ENOTDIR

A component of the path prefix is not a directory.

Bq Er ENAMETOOLONG

A component of a pathname exceeded 255 characters, or an entire path name exceeded 1023 characters.

Bq Er ENOENT

The named file does not exist.

Bq Er EACCES

Search permission is denied for a component of the path prefix.

Bq Er EACCES

Write permission is denied on the directory containing the link to be removed.

Bq Er ELOOP

Too many symbolic links were encountered in translating the pathname.

Bq Er EPERM

The named file is a directory.

Bq Er EPERM

The named file has its immutable, undeletable or append-only flag set, see the chflags(2) manual page for more information.

Bq Er EPERM

The parent directory of the named file has its immutable or append-only flag set.

Bq Er 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.

Bq Er EIO

An I/O error occurred while deleting the directory entry or deallocating the inode.

Bq Er EROFS

The named file resides on a read-only file system.

Bq Er EFAULT

The Fa path argument points outside the process's allocated address space.

SEE ALSO

chflags(2), close(2), link(2), rmdir(2), symlink(7)

HISTORY

The Fn unlink function appeared in AT&T System v6 .

The Fn unlink system call traditionally allows the super-user to unlink directories which can damage the file system integrity. This implementation no longer permits it.