devname - get device name

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.Lb libc

.In sys/stat.h
.In stdlib.h char * devname dev_t dev mode_t type char * devname_r dev_t dev mode_t type 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.

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.

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));

stat(2)

The devname function appeared in BSD 4.4 .

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