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Man Pages
explain_setresuid_or_die(3) FreeBSD Library Functions Manual explain_setresuid_or_die(3)

explain_setresuid_or_die - set r/e/s user ID and report errors

#include <libexplain/setresuid.h>
void explain_setresuid_or_die(uid_t ruid, uid_t euid, uid_t suid);
 
int explain_setresuid_on_error(uid_t ruid, uid_t euid, uid_t suid);

The explain_setresuid_or_die function is used to call the setresuid(2) system call. On failure an explanation will be printed to stderr, obtained from the explain_setresuid(3) function, and then the process terminates by calling exit(EXIT_FAILURE).
The explain_setresuid_on_error function is used to call the setresuid(2) system call. On failure an explanation will be printed to stderr, obtained from the explain_setresuid(3) function, but still returns to the caller.
ruid
The ruid, exactly as to be passed to the setresuid(2) system call.
euid
The euid, exactly as to be passed to the setresuid(2) system call.
suid
The suid, exactly as to be passed to the setresuid(2) system call.

The explain_setresuid_or_die function only returns on success, see setresuid(2) for more information. On failure, prints an explanation and exits, it does not return.
The explain_setresuid_on_error function always returns the value return by the wrapped setresuid(2) system call.

The explain_setresuid_or_die function is intended to be used in a fashion similar to the following example:
explain_setresuid_or_die(ruid, euid, suid);

setresuid(2)
set real, effective and saved user ID
explain_setresuid(3)
explain setresuid(2) errors
exit(2)
terminate the calling process

libexplain version 1.3
 
Copyright (C) 2012 Peter Miller

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