UNLINK(2)

NAME
unlink - delete a name and possibly the file it refers to

SYNOPSIS
#include <unistd.h>

int unlink(const char *pathname);

DESCRIPTION
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 it.

RETURN VALUE
On success, zero is returned. On error, -1 is returned, and errno is set appropriately.

ERRORS

EFAULT
    pathname points outside your accessible address space.

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
    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, or pathname is a directory.

ENAMETOOLONG
    pathname was too long.

ENOENT
    A directory component in pathname does not exist or is a dangling symbolic link.

ENOTDIR
    A component used as a directory in pathname is not, in fact, a directory.

EISDIR
    pathname refers to a directory.

ENOMEM
    Insufficient kernel memory was available.

EROFS
    pathname refers to a file on a read-only filesystem.

ELOOP
    Too many symbolic links were encountered in translating pathname.

EIO An I/O error occurred.

CONFORMING TO
SVr4, SVID, POSIX, X/OPEN, 4.3BSD. SVr4 documents additional error conditions EBUSY, EINTR, EMULTIHOP, ETXTBUSY, ENOLINK.

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

SEE ALSO
link(2), rename(2), open(2), rmdir(2), mknod(2), mkfifo(3), remove(3), rm(1).