mknod man page on DigitalUNIX

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mknod(3)							      mknod(3)

       mknod - makes a directory, or a special or ordinary file.

       #include <sys/types.h> #include <sys/stat.h>

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

       SVR4 Library (libsvr4)

       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	 by  logically	ORing	values
       described  in  the sys/mode.h header file.  Depends upon the configura‐
       tion and is used only if the mode parameter specifies a block or	 char‐
       acter  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  new file named by the path name pointed
       to by the path. The file type and permissions of the new file are  ini‐
       tialized from mode.

       The  file  type	is specified in mode by the S_IFMT bits, which must be
       set to one of the following values:

       The file access permissions are specified in mode by the 0007777	 bits,
       and may be constructed by an OR of the following values:

       Octal Value   Symbolic Mode   Meaning
       S_ISUID	     04000	     Set user ID on execution
       S_ISGID	     020#0	     Set  group ID on execution if
				     #	is  7,5,3  or  1.   Enable
				     mandatory file/record locking
				     if # is 6,4,2 or 0.
       S_ISVTX	      01000	     Save text image after  execu‐
       S_IRWXU	      00700	     Read, write, execute by owner
       S_IRUSR	     00400	     Read by owner
       S_IWUSR	     02000	     Write by owner
       S_IXUSR	     00100	     Execute  (search  if a direc‐
				     tory) by owner
       S_IRWXG	     00070	     Read, write execute by group
       S_IRGRP	     00040	     Read by Group
       S_IWGRP	     00020	     Write by Group
       S_IXGRP	     00010	     Execute by Group
       S_IRWXO	     00007	     Read,     write,	  execute,
				     (search) by others
       S_IROTH	     00004	     Read by others
       S_IWOTH	     00002	     Write by others
       S_IXOTH	      00001	     Execute by others

       The  owner  ID  of  the	file  is  set  to the effective user ID of the
       process.	 The group ID of the file is set to the effective group ID  of
       the  process.   However, if the S_ISGID bit is set in the parent direc‐
       tory, then the group ID of the file is inherited from  the  parent.  If
       the  group  ID of the new file does not match the effective group ID or
       one of the supplementary group IDs, the S_ISGID bit is cleared.

       Success.	 Failure.

       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.
       The process is attempting to create a non-FIFO special  file  and  does
       not  have  the  mknod  effective	 privilege.  The process does not have
       write permission to the parent directory with respect  to  one  of  the
       system's	 configured access policies.  The process possesses the allow‐
       macaccess privilege but its sensitivity label does not dominate that of
       the  parent directory. The process has a WILDCARD sensitivity label but
       does not possess the allowmacaccess effective privilege.	  The  process
       posssesses  the allowmacaccess effective privilege but does not possess
       ilnofloat and the process information level would cause	the  directory
       information  label  to float such that it is no longer dominated by its
       sensitivity level.

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

       Commands: chmod(1), mkdir(1)


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