---
name: "explain_getresuid_or_die"
section: "3"
platform: "linux"
package: "libexplain-dev"
version: "1.4.D001-16"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/explain_getresuid_or_die"
---

# explain\_getresuid\_or\_die(3)

get r/e/s user IDs and report errors

## NAME

explain\_getresuid\_or\_die - get r/e/s user IDs and report errors

## SYNOPSIS

\#include \<libexplain/getresuid.h\>

void explain\_getresuid\_or\_die(uid\_t \*ruid, uid\_t \*euid, uid\_t \*suid);\
 int explain\_getresuid\_on\_error(uid\_t \*ruid, uid\_t \*euid, uid\_t \*suid);

## DESCRIPTION

The **explain\_getresuid\_or\_die** function is used to call the [*getresuid*(2)](/getresuid/2.md) system call. On failure an explanation will be printed to *stderr*, obtained from the [*explain\_getresuid*(3)](/explain_getresuid/3.md) function, and then the process terminates by calling `exit(EXIT_FAILURE)`.

The **explain\_getresuid\_on\_error** function is used to call the [*getresuid*(2)](/getresuid/2.md) system call. On failure an explanation will be printed to *stderr*, obtained from the [*explain\_getresuid*(3)](/explain_getresuid/3.md) function, but still returns to the caller.

- *ruid*

  The ruid, exactly as to be passed to the [*getresuid*(2)](/getresuid/2.md) system call.

- *euid*

  The euid, exactly as to be passed to the [*getresuid*(2)](/getresuid/2.md) system call.

- *suid*

  The suid, exactly as to be passed to the [*getresuid*(2)](/getresuid/2.md) system call.

## RETURN VALUE

The **explain\_getresuid\_or\_die** function only returns on success, see [*getresuid*(2)](/getresuid/2.md) for more information. On failure, prints an explanation and exits, it does not return.

The **explain\_getresuid\_on\_error** function always returns the value return by the wrapped [*getresuid*(2)](/getresuid/2.md) system call.

## EXAMPLE

The **explain\_getresuid\_or\_die** function is intended to be used in a fashion similar to the following example:

```
explain_getresuid_or_die(ruid, euid, suid);
```

## SEE ALSO

- [*getresuid*(2)](/getresuid/2.md)

  get real, effective and saved user IDs

- [*explain\_getresuid*(3)](/explain_getresuid/3.md)

  explain [*getresuid*(2)](/getresuid/2.md) errors

- [*exit*(2)](/exit/2.md)

  terminate the calling process

## COPYRIGHT

libexplain version 1.4\
 Copyright (C) 2012 Peter Miller