10 void __procfdname(char *, unsigned);
12 char *realpath(const char *restrict filename, char *restrict resolved)
17 char buf[15+3*sizeof(int)];
25 fd = open(filename, O_PATH|O_NONBLOCK|O_CLOEXEC);
27 __procfdname(buf, fd);
29 r = readlink(buf, tmp, sizeof tmp - 1);
35 if (r<0 || st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino) {
36 if (!r) errno = ELOOP;
41 return resolved ? strcpy(resolved, tmp) : strdup(tmp);