unlink - delete a name and possibly the file it refers to
int unlink(const char *pathname);
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
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 it.
On success, zero is returned. On error, -1 is returned,
and errno is set appropriately.
EACCES Write access to the directory containing pathname
is not allowed for the process's effective uid, or
one of the directories in pathname did not allow
search (execute) permission.
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.
EPERM The file pathname is a directory.
EFAULT pathname points outside your accessible address
pathname was too long.
ENOENT A directory component in pathname does not exist or
is a dangling symbolic link.
EISDIR pathname refers to a directory.
ENOMEM Insufficient kernel memory was available.
EROFS pathname refers to a file on a read-only filesys
ELOOP Too many symbolic links were encountered in trans
EIO An I/O error occurred.
SVr4, SVID, POSIX, X/OPEN, 4.3BSD. SVr4 documents addi
tional error conditions EBUSY, EINTR, EMULTIHOP, ETXTBSY,
Infelicities in the protocol underlying NFS can cause the
unexpected disappearance of files which are still being
link(2), rename(2), open(2), rmdir(2), mknod(2),
mkfifo(3), remove(3), rm(1)