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BSD 2.11 - man page for unlink (bsd section 2)

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UNLINK(2)										UNLINK(2)

       unlink - remove directory entry

       char *path;

       Unlink removes the entry for the file 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  disap-

       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:

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

       [EINVAL]       The pathname contains a character with the high-order bit set.

       [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

       [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 super-user.

       [EPERM]	      The  directory  containing  the file is marked sticky, and neither the con-
		      taining 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]       Path points outside the process's allocated address space.

       close(2), link(2), rmdir(2)

4th Berkeley Distribution		   May 22, 1985 				UNLINK(2)
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