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



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

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

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

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       mknodat():
       Since glibc 2.10: _XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L
       Before glibc 2.10: _ATFILE_SOURCE

DESCRIPTION
       The mknodat() system call operates in exactly the same way as mknod(2), except for the differences described in this man-
       ual 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 mkn-
       odat():

       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 3.25 of the Linux man-pages project.  A description of the project,  and  information  about
       reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



Linux                                                      2009-12-13                                                 MKNODAT(2)