mknod man page on DigitalUNIX

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mknod(2)							      mknod(2)

       mknod - Create a FIFO or special file

       #include <sys/stat.h>

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

       Interfaces  documented on this reference page conform to industry stan‐
       dards as follows:

       mknod(): POSIX.1, XSH4.2, XSH5.0

       Refer to the standards(5) reference page	 for  more  information	 about
       industry standards and associated tags.

       Standards: standards(5)

       Names the new file.  If the final component of the path parameter names
       a symbolic link, the link will be  traversed  and  pathname  resolution
       will continue.  Specifies the file type, attributes, and access permis‐
       sions. This parameter is constructed with a  logical  OR	 operation  on
       values  described  in  the  <sys/mode.h> header file.  Depends upon the
       configuration and is used only if the mode parameter specifies a	 block
       or  character  special  file. If the file you specify is a remote file,
       the value of the device parameter must be meaningful on the node	 where
       the file resides.

       The mknod() function creates a special file or FIFO.  Using the mknod()
       function to create file types other than FIFO  special  requires	 supe‐
       ruser privilege.

       For  the mknod() function to complete successfully, a process must have
       search permission and write permission in the parent directory  of  the
       path parameter.

       The  new file has the following characteristics: File type as specified
       by the mode parameter Owner ID set to the  process  effective  user  ID
       Group  ID set to the group ID of the file's parent directory Permission
       and attribute bits set according to the value of the mode parameter

	      All bits set in the process file mode creation mask are cleared.
	      See the umask(2) function.

       Upon  successful completion of the mknod() function a value of 0 (zero)
       is returned. Otherwise, a value of -1 is returned and errno is  set  to
       indicate the error.

       If  the	mknod()	 function fails, the new file is not created and errno
       may be set to one of the following values: A component of the path pre‐
       fix denies search permission, or write permission is denied on the par‐
       ent directory of the FIFO to be created.	 The directory	in  which  the
       entry  for  the new link is being placed cannot be extended because the
       user's quota of disk blocks or inodes on the file system is  exhausted.
       The  named  file exists.	 While accessing the file system, an I/O error
       occurred.  An invalid argument has been specified.  The length  of  the
       path  parameter exceeds PATH_MAX or a pathname component is longer than
       NAME_MAX.  A component of the path prefix does not exist	 or  the  path
       parameter  points to an empty string.  The directory that would contain
       the new file cannot be extended or the file system is out of file allo‐
       cation  resources.   A component of the path prefix is not a directory.
       The mode parameter specifies a file type other than FIFO and the	 call‐
       ing  process  does not have the sufficient privilege.  The directory in
       which the file is to be created is located on a read-only file system.

       Functions: chmod(2), mkdir(2), open(2), umask(2), stat(2)

       Commands: chmod(1), mkdir(1)

       Others: standards(5)


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