mkdir(2) [ultrix man page]
mkdir(2) System Calls Manual mkdir(2) Name mkdir - make a directory file Syntax #include <sys/types.h> #include <sys/stat.h> mkdir(path, mode) char *path; mode_t mode; Description The system call creates a new directory file with name path. The mode of the new file is initialized from mode. The protection part of the mode is modified by the process's mode mask. For further information, see 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. The low-order 9 bits of mode are modified by the process's file mode creation mask: all bits set in the process's file mode creation mask are cleared. For further information, see Return Values A 0 return value indicates success. A -1 return value indicates an error, and an error code is stored in errno. Diagnostics The system call fails and a directory is not created if the following occurs: [EISDIR] The named file is a directory, and the arguments specify it is to be opened for writing. [ENOTDIR] A component of the path prefix is not a directory. [ENAMETOOLONG] A component of a pathname exceeded 255 characters, or an entire pathname exceeded 1023 characters. [ENOENT] A component of the path prefix does not exist or the path argument points to an empty string and the environment defined is POSIX or SYSTEM_FIVE. [EACCES] Search permission is denied for a component of the path prefix, or write permission is denied on the parent directory to be created. [EROFS] The named file resides on a read-only file system. [EEXIST] The named file exists. [EFAULT] The path points outside the process's allocated address space. [ELOOP] Too many symbolic links were encountered in translating the pathname. [EIO] An I/O error occurred while reading from or writing to the file system. [EIO] An I/O error occurred while making the directory entry or allocating the inode. [ENOSPC] The directory in which the entry for the new directory is being placed cannot be extended, because there is no space left on the file system containing the directory. [ENOSPC] The new directory cannot be created, because there is no space left on the file system that will contain the directory. [ENOSPC] There are no free inodes on the file system on which the directory is being created. [EDQUOT] The directory in which the entry for the new directory is being placed cannot be extended, because the user's quota of disk blocks on the file system containing the directory has been exhausted. [EDQUOT] The new directory cannot be created, because the user's quota of disk blocks on the file system that will contain the directory has been exhausted. [EDQUOT] The user's quota of inodes on the file system on which the directory is being created has been exhausted. [ESTALE] The file handle given in the argument is invalid. The file referred to by that file handle no longer exists or has been revoked. [ETIMEDOUT] A "connect" request or remote file operation failed because the connected party did not properly respond after a period of time that is dependent on the communications protocol. [EMLINK] The link count of the parent directory would exceed {LINK_MAX}. See Also chmod(2), stat(2), umask(2) mkdir(2)
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MKDIR(2) BSD 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); 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. 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. The mkdirat() system call is equivalent to mkdir() except in the case where path specifies a relative path. In this case the newly created directory is created relative to the directory associated with the file descriptor fd instead of the current working directory. If mkdirat() is passed the special value AT_FDCWD in the fd parameter, the current working directory is used and the behavior is identical to a call to mkdir(). RETURN VALUES
The mkdir() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate the error. ERRORS
The mkdir() system call will fail and no directory will be created if: [ENOTDIR] A component of the path prefix is not a directory. [ENAMETOOLONG] A component of a pathname exceeded 255 characters, or an entire path name exceeded 1023 characters. [ENOENT] A component of the path prefix does not exist. [EACCES] Search permission is denied for a component of the path prefix, or write permission is denied on the parent directory of the directory to be created. [ELOOP] Too many symbolic links were encountered in translating the pathname. [EPERM] The parent directory of the directory to be created has its immutable flag set, see the chflags(2) manual page for more information. [EROFS] The named directory would reside on a read-only file system. [EMLINK] The new directory cannot be created because the parent directory contains too many subdirectories. [EEXIST] The named file exists. [ENOSPC] The new directory cannot be created because there is no space left on the file system that will contain the directory. [ENOSPC] There are no free inodes on the file system on which the directory is being created. [EDQUOT] The new directory cannot be created because the user's quota of disk blocks on the file system that will contain the directory has been exhausted. [EDQUOT] The user's quota of inodes on the file system on which the directory is being created has been exhausted. [EIO] An I/O error occurred while making the directory entry or allocating the inode. [EIO] An I/O error occurred while reading from or writing to the file system. [EFAULT] The path argument points outside the process's allocated address space. In addition to the errors returned by the mkdir(), the mkdirat() may fail if: [EBADF] The path argument does not specify an absolute path and the fd argument is neither AT_FDCWD nor a valid file descriptor open for searching. [ENOTDIR] The path argument is not an absolute path and fd is neither AT_FDCWD nor a file descriptor associated with a directory. SEE ALSO
chflags(2), chmod(2), stat(2), umask(2) STANDARDS
The mkdir() system call is expected to conform to ISO/IEC 9945-1:1990 (``POSIX.1''). The mkdirat() system call follows The Open Group Extended API Set 2 specification. HISTORY
The mkdirat() system call appeared in FreeBSD 8.0. BSD
June 26, 2008 BSD