id = 577
title = "getdtablesize() returns wrong value in qemu user mode on Linux/alpha"
state = "closed"
created_at = "2021-08-29T14:25:14.628Z"
closed_at = "2022-02-07T15:29:56.367Z"
labels = ["linux-user", "target: alpha"]
url = "https://gitlab.com/qemu-project/qemu/-/issues/577"
host-os = "Ubuntu 20.04"
host-arch = "x86_64"
qemu-version = "6.1.0"
guest-os = "Linux"
guest-arch = "alpha"
description = """The `getdtablesize()` function returns a value that is too large. Namely, `getdtablesize() - 1` ought to be a valid file descriptor, but is not."""
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 = """"""