- return syscall(SYS_fchown, fd, uid, gid);
+ int ret = __syscall(SYS_fchown, fd, uid, gid);
+ if (ret != -EBADF || fd < 0) return __syscall_ret(ret);
+
+ char buf[15+3*sizeof(int)];
+ __procfdname(buf, fd);
+ return syscall(SYS_chown, buf, uid, gid);