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



NAME
       mknodat - create a special or ordinary file relative to a directory file descriptor

SYNOPSIS
       #define _ATFILE_SOURCE
       #include <fcntl.h> /* Definition of AT_* constants */
       #include <sys/stat.h>

       int mknodat(int dirfd, const char *pathname, mode_t mode, dev_t dev);

DESCRIPTION
       The mknodat() system call operates in exactly the same way as mknod(2), except for the differences described in
       this manual page.

       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 mknod(2) for a relative pathname).

       If 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 mknod(2)).

       If pathname is absolute, then dirfd is ignored.

RETURN VALUE
       On success, mknodat() returns 0.  On error, -1 is returned and errno is set to indicate the error.

ERRORS
       The  same  errors  that  occur  for mknod(2) can also occur for mknodat().  The following additional errors can
       occur for mknodat():

       EBADF  dirfd is not a valid file descriptor.

       ENOTDIR
              pathname is relative and dirfd is a file descriptor referring to a file other than a directory.

VERSIONS
       mknodat() was added to Linux in kernel 2.6.16.

CONFORMING TO
       POSIX.1-2008.

NOTES
       See openat(2) for an explanation of the need for mknodat().

SEE ALSO
       mknod(2), openat(2), path_resolution(7)

COLOPHON
       This page is part of release 3.22 of the Linux man-pages project.  A description of the project,  and  informa-
       tion about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



Linux                             2008-08-21                        MKNODAT(2)