DEV_MKDB(8) System Manager's Manual DEV_MKDB(8)NAME
dev_mkdb - create /dev database
SYNOPSIS
dev_mkdb
DESCRIPTION
The dev_mkdb command creates a dbm(3) hash access method database in /var/run/dev.db which contains the names of all of the character and
block special files in the /dev directory, using the file type and the st_rdev field as the key.
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.
FILES
/dev Device directory.
/var/run/dev.db Database file.
SEE ALSO ps(1), stat(2), dbm(3), devname(3), ttyname(3)HISTORY
The dev_mkdb command appeared in 4.4BSD.
4th Berkeley Distribution February 3, 1995 DEV_MKDB(8)
Check Out this Related Man Page
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
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