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class method

Process::UID.re_exchange

() -> ::Integer

Process::UID.re_exchange → integer

static VALUE
p_uid_exchange(VALUE obj)
{
    rb_uid_t uid;
#if defined(HAVE_SETRESUID) || (defined(HAVE_SETREUID) && !defined(OBSOLETE_SETREUID))
    rb_uid_t euid;
#endif

    check_uid_switch();

    uid = getuid();
#if defined(HAVE_SETRESUID) || (defined(HAVE_SETREUID) && !defined(OBSOLETE_SETREUID))
    euid = geteuid();
#endif

#if defined(HAVE_SETRESUID)
    if (setresuid(euid, uid, uid) < 0) rb_sys_fail(0);
    SAVED_USER_ID = uid;
#elif defined(HAVE_SETREUID) && !defined(OBSOLETE_SETREUID)
    if (setreuid(euid,uid) < 0) rb_sys_fail(0);
    SAVED_USER_ID = uid;
#else
    rb_notimplement();
#endif
    return UIDT2NUM(uid);
}

Exchange real and effective user IDs and return the new effective user ID. Not available on all platforms.

Example

[Process.uid, Process.euid]   #=> [0, 31]
Process::UID.re_exchange      #=> 0
[Process.uid, Process.euid]   #=> [31, 0]

See also .grant_privilege .re_exchangeable? .from_name .rid also in 4.0 · 3.4 · 3.3 · 3.2 · 3.1 · 3.0

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