unlink man page on OpenBSD

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UNLINK(2)		  OpenBSD Programmer's Manual		     UNLINK(2)

NAME
     unlink - remove directory entry

SYNOPSIS
     #include <unistd.h>

     int
     unlink(const char *path);

DESCRIPTION
     The unlink() function removes the link named by 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 processes 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.

RETURN VALUES
     Upon successful completion, a value of 0 is returned.  Otherwise, a value
     of -1 is returned and 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 {NAME_MAX} characters,
		   or an entire path name exceeded {PATH_MAX} 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 translating the
		   pathname.

     [EPERM]	   The named file is a directory and the effective user ID of
		   the process is not the superuser, or the file system
		   containing the file does not permit the use of unlink() on
		   a directory.

     [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.

     [EPERM]	   The named file has its immutable or append-only flag set
		   (see chflags(2)).

     [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]	   path points outside the process's allocated address space.

SEE ALSO
     rm(1), close(2), link(2), rmdir(2), symlink(7)

HISTORY
     An unlink() function call appeared in Version 2 AT&T UNIX.

OpenBSD 4.9		       October 24, 2008			   OpenBSD 4.9
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