method

switch

v1_9_2_180 - Show latest stable - Class: Process::GID

switch()

public

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

static VALUE
p_gid_switch(VALUE obj)
{
    rb_gid_t gid, egid;

    check_gid_switch();

    gid = getgid();
    egid = getegid();

    if (gid != egid) {
        proc_setegid(obj, GIDT2NUM(gid));
        if (rb_block_given_p()) {
            under_gid_switch = 1;
            return rb_ensure(rb_yield, Qnil, p_gid_sw_ensure, SAVED_GROUP_ID);
        } else {
            return GIDT2NUM(egid);
        }
    }
    else if (egid != SAVED_GROUP_ID) {
        proc_setegid(obj, GIDT2NUM(SAVED_GROUP_ID));
        if (rb_block_given_p()) {
            under_gid_switch = 1;
            return rb_ensure(rb_yield, Qnil, p_gid_sw_ensure, egid);
        } else {
            return GIDT2NUM(gid);
        }
    }
    else {
        errno = EPERM;
        rb_sys_fail(0);
    }
}

switch

Related methods