instruction: 0.516
syscall: 0.243
runtime: 0.241



getdtablesize() returns wrong value in qemu user mode on Linux/alpha
Description of problem:
The `getdtablesize()` function returns a value that is too large. Namely, `getdtablesize() - 1` ought to be a valid file descriptor, but is not.
Steps to reproduce:
[foo.c](/uploads/7a9e99d3811fe4a7eef183ed98c966a4/foo.c)

1.
```
# apt install g++-10-alpha-linux-gnu
```
2.
```
$ alpha-linux-gnu-gcc-10 -Wall -static foo.c
```
[a.out](/uploads/4fffa6dd2332885f51e4030dcbe25644/a.out)

3. Transfer the a.out file to a Linux/alpha machine; execute it there. The return code is 0.
4.
```
$ QEMU_LD_PREFIX=/usr/alpha-linux-gnu ~/inst-qemu/6.1.0/bin/qemu-alpha ./a.out ; echo $?
```
Expected: `0`
Actual: `1`
Additional information: