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unlinkat - remove a directory entry relative to a directory file
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: _ATFILE_SOURCE
The unlinkat() system call operates in exactly the same way as either
unlink(2) or rmdir(2) (depending on whether or not flags includes the
AT_REMOVEDIR flag) except for the differences described in this manual
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(2) 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(2) 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().
Currently only one such flags is defined:
By default, unlinkat() performs the equivalent of unlink(2) on
pathname. If the AT_REMOVEDIR flag is specified, then performs
the equivalent of rmdir(2) on pathname.
On success, unlinkat() returns 0. On error, -1 is returned and errno
is set to indicate the error.
The same errors that occur for unlink(2) and rmdir(2) can also occur
for unlinkat(). The following additional errors can occur for
EBADF dirfd is not a valid file descriptor.
EINVAL An invalid flag value was specified in flags.
pathname is relative and dirfd is a file descriptor referring to
a file other than a directory.
unlinkat() was added to Linux in kernel 2.6.16.
POSIX.1-2008. A similar system call exists on Solaris.
See openat(2) for an explanation of the need for unlinkat().
openat(2), rmdir(2), unlink(2), path_resolution(7)
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