mknod man page on 4.4BSD

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MKNOD(2)		    BSD System Calls Manual		      MKNOD(2)

NAME
     mknod — make a special file node

SYNOPSIS
     #include <unistd.h>

     int
     mknod(const char *path, mode_t mode, dev_t dev);

DESCRIPTION
     The device special file path is created with the major and minor device
     numbers extracted from mode. The access permissions of path are descen‐
     dant from the umask(2) of the parent process.

     If mode indicates a block or character special file, dev is a configura‐
     tion dependent specification of a character or block I/O device and the
     superblock of the device.	If mode does not indicate a block special or
     character special device, dev is ignored.

     Mknod() requires super-user privileges.

RETURN VALUES
     Upon successful completion a value of 0 is returned.  Otherwise, a value
     of -1 is returned and 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.

     [EINVAL]		The pathname contains a character with the high-order
			bit set.

     [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.

     [EPERM]		The pathname contains a character with the high-order
			bit set.

     [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.

SEE ALSO
     chmod(2), stat(2), umask(2)

HISTORY
     A mknod function call appeared in Version 6 AT&T UNIX.

4th Berkeley Distribution	 June 4, 1993	     4th Berkeley Distribution
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