LINKAT(2) Linux Programmer's Manual LINKAT(2)
linkat - create a file link relative to directory file descriptors
int linkat(int olddirfd, const char *oldpath,
int newdirfd, const char *newpath, int flags);
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 spe-
cial value AT_FDCWD, then oldpath is interpreted relative to the cur-
rent 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.
On success, linkat() returns 0. On error, -1 is returned and errno is
set to indicate the error.
The same errors that occur for link(2) can also occur for linkat().
The following additional errors can occur for linkat():
EBADF olddirfd or newdirfd is not a valid file descriptor.
oldpath is a relative path and olddirfd is a file descriptor
referring to a file other than a directory; or similar for new-
path and newdirfd
See openat(2) for an explanation of the need for linkat().
This system call is non-standard but is proposed for inclusion in a
future revision of POSIX.1.
linkat() was added to Linux in kernel 2.6.16.
link(2), openat(2), path_resolution(2)
Linux 2.6.16 2006-04-10 LINKAT(2)
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