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FreeBSD 11.0 - man page for devname (freebsd section 3)

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

devname -- get device name
Standard C Library (libc, -lc)
#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);
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.
int fd; struct stat buf; char *name; fd = open("/dev/tun"); fstat(fd, &buf); printf("devname is /dev/%s\n", devname(buf.st_rdev, S_IFCHR)); printf("fdevname is /dev/%s\n", fdevname(fd));
The devname() function appeared in 4.4BSD. The fdevname() function appeared in FreeBSD 8.0.
February 22, 2005 BSD