dev_mkdb(8) [netbsd man page]

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

NAME

     dev_mkdb -- create /dev database

SYNOPSIS

     dev_mkdb [-c] [-o database] [directory]

DESCRIPTION

     The dev_mkdb command creates a cdbr(3) database in ``/var/run/dev.cdb'' which contains the names of all of the character and block special
     files in the specified directory, using the file type and the st_rdev field as the key.  If no directory is specified, the ``/dev'' directory
     is used.

     Keys are a structure containing a mode_t followed by a dev_t, with any padding zero'd out.  The former is the type of the file (st_mode &
     S_IFMT), the latter is the st_rdev field.

     The options are as follows:

     -c      Create a db(3) database for compatibility with libc versions and statically linked programs from before NetBSD 6.0.  The default name
	     is ``/var/run/dev.db''.

     -o database
	     Put the output databases in the named file.

FILES

     /dev	      Device directory.
     /var/run/dev.db  Database file.

SEE ALSO

     ps(1), stat(2), db(3), devname(3), kvm_nlist(3), ttyname(3), kvm_mkdb(8)

HISTORY

     The dev_mkdb command appeared in 4.4BSD.

BSD
								   June 1, 2012 							       BSD

DEVNAME(3)						   BSD Library Functions Manual 						DEVNAME(3)

NAME

     devname -- get device name

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

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

     char *
     devname(dev_t dev, mode_t type);

     char *
     devname_r(dev_t dev, mode_t type, char *buf, int len);

     char *
     fdevname(int fd);

     char *
     fdevname_r(int fd, char *buf, int len);

DESCRIPTION

     The devname() function returns a pointer to the name of the block or character device in /dev with a device number of dev, and a file type
     matching the one encoded in type which must be one of S_IFBLK or S_IFCHR.	To find the right name, devname() asks the kernel via the
     kern.devname sysctl.  If it is unable to come up with a suitable name, it will format the information encapsulated in dev and type in a
     human-readable format.

     The fdevname() and fdevname_r() function obtains the device name directly from a file descriptor pointing to a character device.  If it is
     unable to come up with a suitable name, these functions will return a NULL pointer.

     devname() and fdevname() return the name stored in a static buffer which will be overwritten on subsequent calls.	devname_r() and
     fdevname_r() take a buffer and length as argument to avoid this problem.

EXAMPLES

     int fd;
     struct stat buf;
     char *name;

	     fd = open("/dev/tun");
	     fstat(fd, &buf);
	     printf("devname is /dev/%s
", devname(buf.st_rdev, S_IFCHR));
	     printf("fdevname is /dev/%s
", fdevname(fd));

SEE ALSO

     stat(2)

HISTORY

     The devname() function appeared in 4.4BSD.  The fdevname() function appeared in FreeBSD 8.0.

BSD
								 February 22, 2005							       BSD