getdevmajor(3) [netbsd man page]

GETDEVMAJOR(3)						   BSD Library Functions Manual 					    GETDEVMAJOR(3)

NAME

     getdevmajor -- get block or character device major number

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

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

     devmajor_t
     getdevmajor(const char *name, mode_t type);

DESCRIPTION

     The getdevmajor() function returns the major device number of the block or character device specified by name and a file type matching the
     one encoded in type which must be one of S_IFBLK or S_IFCHR.

RETURN VALUES

     If no device matches the specified values, no information is available, or an error occurs, NODEVMAJOR is returned and errno is set to indi-
     cate the error.

EXAMPLES

     To retrieve the major number for pty(4) slave devices (aka pts devices):

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

	   devmajor_t pts;
	   pts = getdevmajor("pts", S_IFCHR);

     To retrieve the major numbers for the block and character wd(4) devices:

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

	   devmajor_t c, b;
	   c = getdevmajor("wd", S_IFCHR);
	   b = getdevmajor("wd", S_IFBLK);

ERRORS

     The getdevmajor() function may fail and set errno for any of the errors specified for the library functions malloc(3) and sysctlbyname(3).
     In addition, the following errors may be reported:

     [EINVAL]		The value of the type argument is not S_IFCHR or S_IFBLK.

     [ENOENT]		The named device is not found.

SEE ALSO

     stat(2), devname(3), malloc(3), sysctlbyname(3)

HISTORY

     The getdevmajor() function call appeared in NetBSD 3.0.

BSD
								 January 20, 2009							       BSD

MKNOD(8)						    BSD System Manager's Manual 						  MKNOD(8)

NAME

     mknod -- make device special file

SYNOPSIS

     mknod [-F format] name [c | b] major minor
     mknod [-F format] name [c | b] major unit subunit
     mknod name [c | b] number
     mknod name w

DESCRIPTION

     The mknod command creates device special files.

     To make nodes manually, the required arguments are:

     name    Device name, for example ``sd'' for a SCSI disk on an HP300 or a ``pty'' for pseudo-devices.

     b | c | w
	     Type of device. If the device is a block type device such as a tape or disk drive which needs both cooked and raw special files, the
	     type is b.  Whiteout nodes are type w.  All other devices are character type devices, such as terminal and pseudo devices, and are
	     type c.

     major   The major device number is an integer number which tells the kernel which device driver entry point to use.

     minor   The minor device number tells the kernel which one of several similar devices the node corresponds to; for example, it may be a spe-
	     cific serial port or pty.

     unit and subunit
	     The unit and subunit numbers select a subset of a device; for example, the unit may specify a particular SCSI disk, and the subunit a
	     partition on that disk.  (Currently this form of specification is only supported by the bsdos format, for compatibility with the
	     BSD/OS mknod(8).)

     Device numbers for different operating systems may be packed in a different format.  To create device nodes that may be used by such an oper-
     ating system (e.g. in an exported file system used for netbooting), the -F option is used.  The following formats are recognized: native,
     386bsd, 4bsd, bsdos, freebsd, hpux, isc, linux, netbsd, osf1, sco, solaris, sunos, svr3, svr4 and ultrix.

     Alternatively, a single opaque device number may be specified.

SEE ALSO

     mkfifo(1), mkfifo(2), mknod(2)

HISTORY

     A mknod command appeared in Version 6 AT&T UNIX.  The -F option appeared in NetBSD 1.4.

NetBSD 1.4							September 11, 1998							NetBSD 1.4