mkdir(2)
- NetBSD Manual Pages
MKDIR(2) NetBSD System Calls Manual MKDIR(2)
NAME
mkdir, mkdirat -- make a directory file
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <sys/stat.h>
int
mkdir(const char *path, mode_t mode);
#include <sys/stat.h>
#include <fcntl.h>
int
mkdirat(int fd, const char *path, mode_t mode);
DESCRIPTION
The directory path is created with the access permissions specified by
mode and restricted by the umask(2) of the calling process.
mkdirat() works the same way as mkdir() except if path is relative. In
that case, it is looked up from a directory whose file descriptor was
passed as fd. Search permission is required this directory. fd can be
set to AT_FDCWD in order to specify the current directory.
The directory's owner ID is set to the process's effective user ID. The
directory's group ID is set to that of the parent directory in which it
is created.
RETURN VALUES
The mkdir() and mkdirat() functions return the value 0 if successful;
otherwise the value -1 is returned and the global variable errno is set
to indicate the error.
ERRORS
Both mkdir() and mkdirat() will fail and no directory will be created if:
[EACCES] Search permission is denied for a component of the
path prefix.
[EDQUOT] The new directory cannot be created because the user's
quota of disk blocks on the file system that will con-
tain the directory has been exhausted. Or, the user's
quota of inodes on the file system on which the direc-
tory is being created has been exhausted.
[EEXIST] The named file exists.
[EFAULT] path points outside the process's allocated address
space.
[EIO] An I/O error occurred while making the directory entry
or allocating the inode; or an I/O error occurred
while reading from or writing to the file system.
[ELOOP] Too many symbolic links were encountered in translat-
ing the pathname.
[ENAMETOOLONG] A component of a pathname exceeded {NAME_MAX} charac-
ters, or an entire path name exceeded {PATH_MAX} char-
acters.
[ENOENT] A component of the path prefix does not exist.
[ENOSPC] The new directory cannot be created because there is
no space left on the file system that will contain the
directory. Or, there are no free inodes on the file
system on which the directory is being created.
[ENOTDIR] A component of the path prefix is not a directory.
[EROFS] The named file resides on a read-only file system.
In addition, mkdirat() will fail if:
[EBADF] path does not specify an absolute path and fd is nei-
ther AT_FDCWD nor a valid file descriptor open for
reading or searching.
[ENOTDIR] path is not an absolute path and fd is a file descrip-
tor associated with a non-directory file.
SEE ALSO
chmod(2), stat(2), umask(2)
STANDARDS
The mkdir() function conforms to ISO/IEC 9945-1:1990 (``POSIX.1'').
mkdirat() conforms to IEEE Std 1003.1-2008 (``POSIX.1'').
HISTORY
The mkdir() function appeared in Version 1 AT&T UNIX.
NetBSD 9.3 September 1, 2019 NetBSD 9.3
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