method

switch

v1_9_3_392 - Show latest stable - 0 notes - Class: Process::UID

switch() public

Switch the effective and real user IDs of the current process. If a block is given, the user IDs will be switched back after the block is executed. Returns the new effective user ID if called without a block, and the return value of the block if one is given.

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static VALUE
p_uid_switch(VALUE obj)
{
    rb_uid_t uid, euid;

    check_uid_switch();

    uid = getuid();
    euid = geteuid();

    if (uid != euid) {
        proc_seteuid(obj, UIDT2NUM(uid));
        if (rb_block_given_p()) {
            under_uid_switch = 1;
            return rb_ensure(rb_yield, Qnil, p_uid_sw_ensure, SAVED_USER_ID);
        } else {
            return UIDT2NUM(euid);
        }
    } else if (euid != SAVED_USER_ID) {
        proc_seteuid(obj, UIDT2NUM(SAVED_USER_ID));
        if (rb_block_given_p()) {
            under_uid_switch = 1;
            return rb_ensure(rb_yield, Qnil, p_uid_sw_ensure, euid);
        } else {
            return UIDT2NUM(uid);
        }
    } else {
        errno = EPERM;
        rb_sys_fail(0);
    }
}

switch

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