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linkat() - Unix, Linux System Call
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NAME
linkat - create a file link relative to directory file descriptors
SYNOPSIS
#include <unistd.h>
int linkat(int olddirfd, const char *oldpath,
int newdirfd, const char *newpath, int flags);
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DESCRIPTION
The
linkat() system call operates in exactly the same way as
link(2),
except for the differences described in this manual page.
If the pathname given in
oldpath is relative, then it is interpreted relative to the directory
referred to by the file descriptor
olddirfd (rather than relative to the current working directory of
the calling process, as is done by
link(2)
for a relative pathname).
If the pathname given in
oldpath is relative and
olddirfd is the special value
AT_FDCWD, then
oldpath is interpreted relative to the current working
directory of the calling process (like
link(2)).
If the pathname given in
oldpath is absolute, then
olddirfd is ignored.
The interpretation of
newpath is as for
oldpath, except that a relative pathname is interpreted relative
to the directory referred to by the file descriptor
newdirfd.
The
flags argument is currently unused, and must be specified as 0.
RETURN VALUE
On success,
linkat() returns 0.
On error, -1 is returned and
errno is set to indicate the error.
ERRORS
The same errors that occur for
link(2)
can also occur for
linkat(). The following additional errors can occur for
linkat():
Tag | Description |
EBADF |
olddirfd or
newdirfd is not a valid file descriptor.
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ENOTDIR | |
oldpath is a relative path and
olddirfd is a file descriptor referring to a file other than a directory;
or similar for
newpath and
newdirfd |
NOTES
See
openat(2)
for an explanation of the need for
linkat(). CONFORMING TO
This system call is non-standard but is proposed
for inclusion in a future revision of POSIX.1.
VERSIONS
linkat() was added to Linux in kernel 2.6.16.
SEE ALSO
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