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NetBSD 6.1.5 - man page for unlink (netbsd section 2)

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UNLINK(2)			     BSD System Calls Manual				UNLINK(2)

     unlink -- remove directory entry

     Standard C Library (libc, -lc)

     #include <unistd.h>

     unlink(const char *path);

     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 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.

     Upon successful completion, a value of 0 is returned.  Otherwise, a value of -1 is returned
     and errno is set to indicate the error.

     The unlink() succeeds unless:

     [EACCES]		Search permission is denied for a component of the path prefix, or write
			permission is denied on the directory containing the link to be removed.

     [EBUSY]		The entry to be unlinked is the mount point for a mounted file system.

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

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

     [ELOOP]		Too many symbolic links were encountered in translating the pathname.

     [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.

     [ENOTDIR]		A component of the path prefix is not a directory.

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

     [EROFS]		The named file resides on a read-only file system.

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

     The unlink() function conforms to ISO/IEC 9945-1:1990 (``POSIX.1'').

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

BSD					  April 3, 2010 				      BSD
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