Linux man pages : mkdir (2)
MKDIR(2) Linux Programmer's Manual MKDIR(2)
mkdir - create a directory
int mkdir(const char *pathname, mode_t mode);
mkdir attempts to create a directory named pathname.
mode specifies the permissions to use. It is modified by the process's
umask in the usual way: the permissions of the created file are (mode &
The newly created directory will be owned by the effective uid of the
process. If the directory containing the file has the set group id bit
set, or if the filesystem is mounted with BSD group semantics, the new
directory will inherit the group ownership from its parent; otherwise
it will be owned by the effective gid of the process.
If the parent directory has the set group id bit set then so will the
newly created directory.
mkdir returns zero on success, or -1 if an error occurred (in which
case, errno is set appropriately).
EPERM The filesystem containing pathname does not support the creation
EEXIST pathname already exists (not necessarily as a directory). This
includes the case where pathname is a symbolic link, dangling or
EFAULT pathname points outside your accessible address space.
EACCES The parent directory does not allow write permission to the pro-
cess, or one of the directories in pathname did not allow search
pathname was too long.
ENOENT A directory component in pathname does not exist or is a dan-
gling symbolic link.
A component used as a directory in pathname is not, in fact, a
ENOMEM Insufficient kernel memory was available.
EROFS pathname refers to a file on a read-only filesystem.
ELOOP Too many symbolic links were encountered in resolving pathname.
ENOSPC The device containing pathname has no room for the new direc-
ENOSPC The new directory cannot be created because the user's disk
quota is exhausted.
SVr4, POSIX, BSD, SYSV, X/OPEN. SVr4 documents additional EIO, EMULTI-
HOP and ENOLINK error conditions; POSIX.1 omits ELOOP.
There are many infelicities in the protocol underlying NFS. Some of
these affect mkdir.
mkdir(1), chmod(2), mknod(2), mount(2), rmdir(2), stat(2), umask(2),
Linux 1.0 1994-03-29 MKDIR(2)