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CentOS 7.0 - man page for mknodat (centos section 2)

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

mknodat - create a special or ordinary file relative to a directory file descriptor
#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 Before glibc 2.10: _ATFILE_SOURCE
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.
On success, mknodat() returns 0. On error, -1 is returned and errno is set to indicate the error.
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.
mknodat() was added to Linux in kernel 2.6.16; library support was added to glibc in version 2.4.
See openat(2) for an explanation of the need for mknodat().
mknod(2), openat(2), path_resolution(7)
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at Linux 2012-05-04 MKNODAT(2)