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#include <unistd.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
int ttyname_r(int fd, char *name, size_t size)
{
char procname[sizeof "/proc/self/fd/" + 3*sizeof(int) + 2];
ssize_t l;
if (!isatty(fd)) return ENOTTY;
snprintf(procname, sizeof procname, "/proc/self/fd/%d", fd);
l = readlink(procname, name, size);
if (l < 0) return errno;
else if (l == size) return ERANGE;
else return 0;
}
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