linkat man page on CentOS

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LINKAT(2)		   Linux Programmer's Manual		     LINKAT(2)

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);

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 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.

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():

       EBADF  olddirfd or newdirfd is not a valid file descriptor.

       ENOTDIR
	      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

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
       link(2), openat(2), path_resolution(2)

Linux 2.6.16			  2006-04-10			     LINKAT(2)
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