mknod (2)
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NAME
mknod mknodat - make a special file nodeLIBRARY
Lb libcSYNOPSIS
In sys/stat.h Ft int Fn mknod const char *path mode_t mode dev_t dev Ft int Fn mknodat int fd const char *path mode_t mode dev_t devDESCRIPTION
The file system node Fa path is created with the file type and access permissions specified in Fa mode . The access permissions are modified by the process's umask value.If Fa mode indicates a block or character special file, Fa dev is a configuration dependent specification denoting a particular device on the system. Otherwise, Fa dev is ignored.
The Fn mknod system call requires super-user privileges.
The Fn mknodat system call is equivalent to Fn mknod except in the case where Fa path specifies a relative path. In this case the newly created device node is created relative to the directory associated with the file descriptor Fa fd instead of the current working directory. If Fn mknodat is passed the special value AT_FDCWD in the Fa fd parameter, the current working directory is used and the behavior is identical to a call to Fn mknod .
RETURN VALUES
Rv -std mknodERRORS
The Fn mknod system call will fail and the file will be not created if:- Bq Er ENOTDIR
- A component of the path prefix is not a directory.
- Bq Er ENAMETOOLONG
- A component of a pathname exceeded 255 characters, or an entire path name exceeded 1023 characters.
- Bq Er ENOENT
- A component of the path prefix does not exist.
- Bq Er EACCES
- Search permission is denied for a component of the path prefix.
- Bq Er ELOOP
- Too many symbolic links were encountered in translating the pathname.
- Bq Er EPERM
- The process's effective user ID is not super-user.
- Bq Er EIO
- An I/O error occurred while making the directory entry or allocating the inode.
- Bq Er 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 directory.
- Bq Er ENOSPC
- There are no free inodes on the file system on which the node is being created.
- Bq Er 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.
- Bq Er EDQUOT
- The user's quota of inodes on the file system on which the node is being created has been exhausted.
- Bq Er EROFS
- The named file resides on a read-only file system.
- Bq Er EEXIST
- The named file exists.
- Bq Er EFAULT
- The Fa path argument points outside the process's allocated address space.
- Bq Er EINVAL
- Creating anything else than a block or character special file (or a whiteout is not supported.
In addition to the errors returned by the Fn mknod , the Fn mknodat may fail if:
- Bq Er EBADF
- The Fa path argument does not specify an absolute path and the Fa fd argument is neither AT_FDCWD nor a valid file descriptor open for searching.
- Bq Er ENOTDIR
- The Fa path argument is not an absolute path and Fa fd is neither AT_FDCWD nor a file descriptor associated with a directory.