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mknod(2)				   System Calls 				 mknod(2)

       mknod - make a directory, a special file, or a regular file

       #include <sys/stat.h>

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

       The  mknod()  function  creates	a new file named by the path name pointed to by path. The
       file type and permissions of the new file are initialized from mode.

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

       S_IFIFO	  fifo special

       S_IFCHR	  character special

       S_IFDIR	  directory

       S_IFBLK	  block special

       S_IFREG	  ordinary file

       The  file  access  permissions  are specified in mode by the 0007777 bits, and may be con-
       structed by a bitwise OR operation of the following values:

       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	 On  directories,   restricted	 deletion
				 flag;	on  regular  files  on a UFS file
				 system, do not cache flag.
       S_IRWXU	     00700	 Read, write, execute by owner.
       S_IRUSR	     00400	 Read by owner.
       S_IWUSR	     00200	 Write by owner.
       S_IXUSR	     00100	 Execute  (search  if  a  directory)   by
       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 directory, 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  sup-
       plementary group IDs, the S_ISGID bit is cleared.

       The  access permission bits of mode are modified by the process's file mode creation mask:
       all bits set in the process's file mode creation mask are cleared (see umask(2)). If  mode
       indicates  a  block or character special file, dev is a configuration-dependent specifica-
       tion of a character or block I/O device. If mode does not  indicate  a  block  special  or
       character special device, dev is ignored. See makedev(3C).

       If path is a symbolic link, it is not followed.

       Upon  successful  completion, mknod() returns 0. Otherwise, it returns -1, the new file is
       not created, and errno is set to indicate the error.

       The mknod() function will fail if:

       EACCES	       A component of the path prefix denies search permission, or write  permis-
		       sion is denied on the parent directory.

       EDQUOT	       The  directory where the new file entry is being placed cannot be extended
		       because the user's quota of disk blocks	on  that  file	system	has  been
		       exhausted, or the user's quota of inodes on the file system where the file
		       is being created has been exhausted.

       EEXIST	       The named file exists.

       EFAULT	       The path argument points to an illegal address.

       EINTR	       A signal was caught during the execution of the mknod() function.

       EINVAL	       An invalid argument exists.

       EIO	       An I/O error occurred while accessing the file system.

       ELOOP	       Too many symbolic links were encountered in translating path.

       ENAMETOOLONG    The length of the path argument exceeds {PATH_MAX}, or  the  length  of	a
		       path component exceeds {NAME_MAX} while _POSIX_NO_TRUNC is in effect.

       ENOENT	       A component of the path prefix specified by path does not name an existing
		       directory or path is an empty string.

       ENOLINK	       The path argument points to a remote machine and the link to that  machine
		       is no longer active.

       ENOSPC	       The  directory  that  would contain the new file cannot be extended or the
		       file system is out of file allocation resources.

       ENOTDIR	       A component of the path prefix is not a directory.

       EPERM	       Not all privileges are asserted	in  the  effective  set  of  the  calling

       EROFS	       The directory in which the file is to be created is located on a read-only
		       file system.

       The mknod() function may fail if:

       ENAMETOOLONG    Pathname resolution of a symbolic link  produced  an  intermediate  result
		       whose length exceeds {PATH_MAX}.

       Applications  should  use  the mkdir(2) function to create a directory because appropriate
       permissions are not required and because mknod() might not establish directory entries for
       the  directory  itself  (.)  and  the  parent  directory (..). The mknod() function can be
       invoked only by a privileged user for file types other than FIFO special.  The  mkfifo(3C)
       function should be used to create FIFOs.

       Doors  are created using door_create(3C) and can be attached to the file system using fat-
       tach(3C). Symbolic links can be created using symlink(2). An  endpoint  for  communication
       can be created using socket(3SOCKET).

       See attributes(5) for descriptions of the following attributes:

       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       |Interface Stability	     |Standard			   |
       |MT-Level		     |Async-Signal-Safe 	   |

       chmod(2),  creat(2),  exec(2), mkdir(2), open(2), stat(2), symlink(2), umask(2), door_cre-
       ate(3C),   fattach(3C),	 makedev(3C),	mkfifo(3C),    socket(3SOCKET),    stat.h(3HEAD),
       attributes(5), privileges(5), standards(5)

SunOS 5.11				   19 Feb 2004					 mknod(2)
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