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#define _GNU_SOURCE
#include <unistd.h>
#include <stdio.h>
#include <errno.h>
#include <pwd.h>
#include <sys/types.h>
#include <sys/syscall.h>
 
int seteuid(uid_t uid)
{
    int result;
 
    if (uid == (uid_t) ~0)
    {
	__set_errno (EINVAL);
	return -1;
    }
 
#ifdef __NR_setresuid
    result = setresuid(-1, uid, -1);
    if (result == -1 && errno == ENOSYS)
	/* Will also set the saved user ID if euid != uid,
	 * making it impossible to switch back...*/
#endif
	result = setreuid(-1, uid);
 
    return result;
}