NAME
devname, devname_r – 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_IFBLK or S_IFCHR. If no device matches the specified values, or no information is available, NULL is returned.
The devname() function uses a static buffer, which will be overwritten on subsequent calls. The devname_r() functions takes a buffer and length as arguments to avoid this problem.
The traditional display for applications when no device is found is the string “??”.
SEE ALSO
HISTORY
The devname() function call appeared in 4.4BSD.