#include <fcntl.h> /* Definition of AT_* constants */
int mkdirat(int dirfd, const char *pathname, mode_t mode);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
Since glibc 2.10:
_XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L
Before glibc 2.10:
The mkdirat() system call operates in exactly the same way as mkdir(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 mkdir(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 mkdir(2)).
If pathname is absolute, then dirfd is ignored.
On success, mkdirat() returns 0. On error, -1 is returned and errno is
set to indicate the error.
The same errors that occur for mkdir(2) can also occur for mkdirat().
The following additional errors can occur for mkdirat():
EBADF dirfd is not a valid file descriptor.
pathname is relative and dirfd is a file descriptor referring to
a file other than a directory.
mkdirat() 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 mkdirat().
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