Making Special Files
====================
The `mknod' function is the primitive for making special files, such
as files that correspond to devices. The GNU library includes this
function for compatibility with BSD.
The prototype for `mknod' is declared in `sys/stat.h'.
- Function: int mknod (const char *FILENAME, int MODE, int DEV)
The `mknod' function makes a special file with name FILENAME. The
MODE specifies the mode of the file, and may include the various
special file bits, such as `S_IFCHR' (for a character special file)
or `S_IFBLK' (for a block special file). Note:Testing File
Type.
The DEV argument specifies which device the special file refers to.
Its exact interpretation depends on the kind of special file being
created.
The return value is `0' on success and `-1' on error. In addition
to the usual file name errors (Note:File Name Errors), the
following `errno' error conditions are defined for this function:
`EPERM'
The calling process is not privileged. Only the superuser
can create special files.
`ENOSPC'
The directory or file system that would contain the new file
is full and cannot be extended.
`EROFS'
The directory containing the new file can't be modified
because it's on a read-only file system.
`EEXIST'
There is already a file named FILENAME. If you want to
replace this file, you must remove the old file explicitly
first.