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);

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_IF

BLK 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.

devname() returns the name stored in a static buffer which

will be overwritten on subsequent calls. devname_r() takes 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/%s0, devname(buf.st_rdev,

S_IFCHR));

SEE ALSO

stat(2)

HISTORY

The devname() function appeared in 4.4BSD.

BSD February 22, 2005

BSD