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FreeBSD man pages : mknod (2)
MKNOD(2)		  FreeBSD System Calls Manual		      MKNOD(2)

NAME

mknod - make a special file node

LIBRARY

Standard C Library (libc, -lc)

SYNOPSIS

#include <unistd.h> int mknod(const char *path, mode_t mode, dev_t dev);

DESCRIPTION

The filesystem node path is created with the file type and access permis- sions specified in mode. The access permissions are modified by the pro- cess's umask value. If mode indicates a block or character special file, dev is a configura- tion dependent specification denoting a particular device on the system. Otherwise, dev is ignored. Mknod() requires super-user privileges.

RETURN VALUES

The mknod() 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

Mknod() will fail and the file will be not 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. [ELOOP] Too many symbolic links were encountered in translat- ing the pathname. [EPERM] The process's effective user ID is not super-user. [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 node is being placed cannot be extended because there is no space left on the file system containing the direc- tory. [ENOSPC] There are no free inodes on the file system on which the node is being created. [EDQUOT] The directory in which the entry for the new node 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 user's quota of inodes on the file system on which the node is being created has been exhausted. [EROFS] The named file resides on a read-only file system. [EEXIST] The named file exists. [EFAULT] Path points outside the process's allocated address space. [EINVAL] Creating anything else than a block or character spe- cial file (or a whiteout) is not supported.

SEE ALSO

chmod(2), mkfifo(2), stat(2), umask(2)

HISTORY

A mknod() function call appeared in Version 6 AT&T UNIX. FreeBSD 4.8 June 4, 1993 FreeBSD 4.8