#include <unistd.h>
#include <errno.h>
-
-void __procfdname(char *, unsigned);
+#include <sys/stat.h>
+#include "syscall.h"
int ttyname_r(int fd, char *name, size_t size)
{
+ struct stat st1, st2;
char procname[sizeof "/proc/self/fd/" + 3*sizeof(int) + 2];
ssize_t l;
- if (!isatty(fd)) return ENOTTY;
+ if (!isatty(fd)) return errno;
__procfdname(procname, fd);
l = readlink(procname, name, size);
if (l < 0) return errno;
else if (l == size) return ERANGE;
- else {
- name[l] = 0;
- return 0;
- }
+
+ name[l] = 0;
+
+ if (stat(name, &st1) || fstat(fd, &st2))
+ return errno;
+ if (st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino)
+ return ENODEV;
+
+ return 0;
}