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           #include <unistd.h>
           int unlink(const char *pathname);
           #include <fcntl.h>           /* Definition of AT_* constants */
           #include <unistd.h>
           int unlinkat(int dirfd, const char *pathname, int flags);
       Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
               Since glibc 2.10:
                   _XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L
               Before glibc 2.10:


           unlink() deletes a name from the filesystem.  If that name was the last
           link to a file and no processes have the file open the file is  deleted
           and the space it was using is made available for reuse.
           If  the  name  was the last link to a file but any processes still have
           the file open the file will remain in existence  until  the  last  file
           descriptor referring to it is closed.
           If the name referred to a symbolic link the link is removed.
           If  the  name  referred  to a socket, fifo or device the name for it is
           removed but processes which have the object open may  continue  to  use
           The  unlinkat()  system call operates in exactly the same way as either
           unlink() or rmdir(2) (depending on whether or not  flags  includes  the
           AT_REMOVEDIR flag) except for the differences described here.
           If  the  pathname given in pathname is relative, then it is interpreted
           relative to the directory referred to  by  the  file  descriptor  dirfd
           (rather  than  relative to the current working directory of the calling
           process, as is done by unlink() and rmdir(2) for a relative  pathname).
           If  the pathname given in pathname is relative and dirfd is the special
           value AT_FDCWD, then pathname is interpreted relative  to  the  current
           working  directory of the calling process (like unlink() and rmdir(2)).
           If the pathname given in pathname is absolute, then dirfd is ignored.
           flags is a bit mask that can either be specified  as  0,  or  by  ORing
           together  flag  values  that control the operation of unlinkat().  Cur-
           rently only one such flag is defined:
                  for the process's effective UID, or one of  the  directories  in
                  pathname  did not allow search permission.  (See also path_reso-
           EBUSY  The file pathname cannot be unlinked because it is being used by
                  the  system or another process; for example, it is a mount point
                  or the NFS client software created it to represent an active but
                  otherwise nameless inode ("NFS silly renamed").
           EFAULT pathname points outside your accessible address space.
           EIO    An I/O error occurred.
           EISDIR pathname  refers  to  a directory.  (This is the non-POSIX value
                  returned by Linux since 2.1.132.)
           ELOOP  Too many symbolic links were encountered  in  translating  path-
                  pathname was too long.
           ENOENT A component in pathname does not exist or is a dangling symbolic
                  link, or pathname is empty.
           ENOMEM Insufficient kernel memory was available.
                  A component used as a directory in pathname is not, in  fact,  a
           EPERM  The system does not allow unlinking of directories, or unlinking
                  of directories requires  privileges  that  the  calling  process
                  doesn't  have.   (This  is the POSIX prescribed error return; as
                  noted above, Linux returns EISDIR for this case.)
           EPERM (Linux only)
                  The filesystem does not allow unlinking of files.
           EPERM or EACCES
                  The directory containing pathname has the sticky  bit  (S_ISVTX)
                  set  and  the  process's effective UID is neither the UID of the
                  file to be deleted nor that of the directory containing it,  and
                  the  process  is  not  privileged  (Linux:  does  not  have  the
                  CAP_FOWNER capability).
           EROFS  pathname refers to a file on a read-only filesystem.
           The same errors that occur for unlink() and rmdir(2) can also occur for
           unlinkat().  The following additional errors can occur for unlinkat():
           EBADF  dirfd is not a valid file descriptor.


           unlink(): SVr4, 4.3BSD, POSIX.1-2001, POSIX.1-2008.
           unlinkat(): POSIX.1-2008.


           Infelicities in the protocol underlying NFS can  cause  the  unexpected
           disappearance of files which are still being used.


           rm(1),  chmod(2),  link(2),  mknod(2),  open(2),  rename(2),  rmdir(2),
           mkfifo(3), remove(3), path_resolution(7), symlink(7)

    Linux 2014-02-21 UNLINK(2)


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