mknod(2) [minix man page]

MKNOD(2)							System Calls Manual							  MKNOD(2)

NAME

       mknod, mkfifo - make a special file

SYNOPSIS

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

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

DESCRIPTION

       Mknod  creates  a new file whose name is path.  The mode of the new file (including special file bits) is initialized from mode, as defined
       in <sys/stat.h>.  (The protection part of the mode is modified by the process's mode mask (see umask(2))).  The first block pointer of  the
       i-node is initialized from dev and is used to specify which device the special file refers to.

       If  mode  indicates  a block or character special file, dev is the device number of a character or block I/O device.  The low eight bits of
       the device number hold the minor device number that selects a device among the devices governed by the same driver.  The driver is selected
       by the major device number, the next eight bits of the device number.

       If  mode  does  not  indicate  a block special or character special device, dev is ignored.  (For example, when creating a ``fifo'' special
       file.)

       Mknod may be invoked only by the super-user, unless it is being used to create a fifo.

       The call mkfifo(path, mode) is equivalent to

	      mknod(path, (mode & 0777) | S_IFIFO, 0)

RETURN VALUE

       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 mode will be unchanged if:

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

       [ENAMETOOLONG] The path name exceeds PATH_MAX 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 translating the pathname.  (Minix-vmd)

       [EPERM]	      The process's effective user ID is not super-user.

       [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 directory.

       [ENOSPC]       There are no free inodes on the file system on which the node is being created.

       [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).

4th Berkeley Distribution					   May 23, 1986 							  MKNOD(2)

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MKFIFO(2)						      BSD System Calls Manual							 MKFIFO(2)

NAME

     mkfifo -- make a fifo file

SYNOPSIS

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

     int
     mkfifo(const char *path, mode_t mode);

DESCRIPTION

     mkfifo() creates a new fifo file with name path.  The access permissions are specified by mode and restricted by the umask(2) of the calling
     process.

     The fifo's owner ID is set to the process's effective user ID.  The fifo's group ID is set to that of the parent directory in which it is
     created.

RETURN VALUES

     A 0 return value indicates success.  A -1 return value indicates an error, and an error code is stored in errno.

ERRORS

     mkfifo() will fail and no fifo will be created if:

     [ENOTSUP]		The kernel has not been configured to support fifo's.

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

     [ENAMETOOLONG]	A component of a pathname exceeded {NAME_MAX} characters, or an entire path name exceeded {PATH_MAX} 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 translating the pathname.

     [EROFS]		The named file resides on a read-only file system.

     [EEXIST]		The named file exists.

     [ENOSPC]		The directory in which the entry for the new fifo is being placed cannot be extended because there is no space left on the
			file system containing the directory.

     [ENOSPC]		There are no free inodes on the file system on which the fifo is being created.

     [EDQUOT]		The directory in which the entry for the new fifo 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 fifo is being created has been exhausted.

     [EIO]		An I/O error occurred while making the directory entry or allocating the inode.

     [EIO]		An I/O error occurred while reading from or writing to the file system.

     [EFAULT]		Path points outside the process's allocated address space.

SEE ALSO

     chmod(2), stat(2), umask(2)

STANDARDS

     The mkfifo function call conforms to IEEE Std 1003.1-1988 (``POSIX.1'').

BSD
								   June 4, 1993 							       BSD

Linux and UNIX Man Pages

mknod(2) [minix man page]

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