Linux 2.6 - man page for mkdirat (linux section 2)
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MKDIRAT(2) Linux Programmer's Manual MKDIRAT(2)
mkdirat - create a directory relative to a directory file descriptor
#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 inter-
preted 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 same errors that occur for mkdir(2) can also occur for mkdirat(). The following addi-
tional 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
mkdirat() was added to Linux in kernel 2.6.16; library support was added to glibc in ver-
See openat(2) for an explanation of the need for mkdirat().
mkdir(2), openat(2), path_resolution(7)
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project, and information about reporting bugs, can be found at
Linux 2012-05-04 MKDIRAT(2)
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