svcadm(8)을 검색하려면 섹션에서 8 을 선택하고, 맨 페이지 이름에 svcadm을 입력하고 검색을 누른다.
unlink(2)
unlink(2) System Calls unlink(2)
NAME
unlink, unlinkat - remove directory entry
SYNOPSIS
#include <unistd.h>
int unlink(const char *path);
int unlinkat(int dirfd, const char *path, int flag);
DESCRIPTION
The unlink() function removes a link to a file. If path names a sym‐
bolic link, unlink() removes the symbolic link named by path and does
not affect any file or directory named by the contents of the symbolic
link. unlink() cannot be used on directories, and an attempt to do so
will fail. Otherwise, unlink() removes the link named by the pathname
pointed to by path and decrements the link count of the file referenced
by the link.
The unlinkat() function also removes a link to a file. See fsattr(7).
If the flag argument is 0, the behavior of unlinkat() is the same as
unlink() except in the processing of its path argument. If path is ab‐
solute, unlinkat() behaves the same as unlink() and the dirfd argument
is unused. If path is relative and dirfd has the value AT_FDCWD, de‐
fined in <fcntl.h>, unlinkat() also behaves the same as unlink(). Oth‐
erwise, path is resolved relative to the directory referenced by the
dirfd argument.
If the flag argument is set to the value AT_REMOVEDIR, defined in <fc‐
ntl.h>, unlinkat() behaves the same as rmdir(2) except in the process‐
ing of the path argument as described above. If the path argument names
a directory and AT_REMOVEDIR is not set in the flag argument, un‐
linkat() will fail.
When the file's link count becomes 0 and no process has the file open,
the space occupied by the file will be freed and the file is no longer
accessible. If one or more processes have the file open when the last
link is removed, the link is removed before unlink() or unlinkat() re‐
turns, but the removal of the file contents is postponed until all ref‐
erences to the file are closed.
Upon successful completion, unlink() and unlinkat() will mark for up‐
date the st_ctime and st_mtime fields of the parent directory. If the
file's link count is not 0, the st_ctime field of the file will be
marked for update.
RETURN VALUES
Upon successful completion, 0 is returned. Otherwise, −1 is returned,
errno is set to indicate the error, and the file is not unlinked.
ERRORS
The unlink() and unlinkat() functions will fail if:
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.
EACCES The parent directory has the sticky bit set and the
file is not writable by the user, the user does not own
the parent directory, the user does not own the file,
and the user is not a privileged user.
EBUSY The entry to be unlinked is the mount point for a
mounted file system, or a previously unlinked NFS file
waiting for references to be released.
EFAULT The path argument points to an illegal address.
EILSEQ The path argument includes non-UTF8 characters and the
file system accepts only file names where all charac‐
ters are part of the UTF-8 character codeset.
EINTR A signal was caught during the execution of the un‐
link() function.
ELOOP Too many symbolic links were encountered in translating
path.
ENAMETOOLONG The length of the path argument exceeds PATH_MAX, or
the length of a path component exceeds NAME_MAX while
_POSIX_NO_TRUNC is in effect.
ENOENT The named file does not exist or is a null pathname.
ENOLINK The path argument points to a remote machine and the
link to that machine is no longer active.
ENOTDIR A component of the path prefix is not a directory.
EPERM The file or the parent directory has the immutable or
nounlink system attribute set.
The file has the rtime system attribute set and the
conditions of the filesystem's retention policy for re‐
moving it are not met. See retention.policy in the
zfs(8) manual page.
EROFS The directory entry to be unlinked is part of a read-
only file system.
The unlink() function will fail if:
EPERM The named file is a directory. Oracle Solaris does not support
unlink() on directories.
The unlinkat() function will fail if:
ENOTDIR The provided dirfd is not AT_FDCWD or does not reference a
directory.
The named file is not a directory and AT_REMOVEDIR was set
in the flag argument.
EPERM The named file is a directory and AT_REMOVEDIR was not set
in the flag argument.
The unlink() and unlinkat() functions may fail if:
ENAMETOOLONG Pathname resolution of a symbolic link produced an in‐
termediate result whose length exceeds {PATH_MAX}.
ETXTBSY The entry to be unlinked is the last directory entry to
a pure procedure (shared text) file that is being exe‐
cuted.
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ Interface StabilityCommitted _ MT-LevelAsync-Signal-
Safe
SEE ALSO
rm(1), close(2), link(2), open(2), rmdir(2), remove(3C), attributes(7),
fsattr(7), privileges(7), sysattr(7)
HISTORY
Support for unlinking directories was removed in the Oracle Solaris
11.2.0 release. Prior to that change, the behavior was filesystem de‐
pendent. UFS allowed it for privileged users. It has never been sup‐
ported by ZFS.
The unlinkat() function was added in the Solaris 9 release.
The unlink() function has been included in all Sun and Oracle releases
of Solaris.
Oracle Solaris 11.4 30 Jan 2023 unlink(2)