/*
 * This file and its contents are supplied under the terms of the
 * Common Development and Distribution License ("CDDL"), version 1.0.
 * You may only use this file in accordance with the terms of version
 * 1.0 of the CDDL.
 *
 * A full copy of the text of the CDDL should have accompanied this
 * source.  A copy of the CDDL is also available via the Internet at
 * http://www.illumos.org/license/CDDL.
 */

/*
 * Copyright (c) 2015, Joyent, Inc.
 */

/*
 * Verify that using MC_INHERIT_ZERO works just fine when applied to an entire
 * region that is mlocked.
 */

#include <sys/types.h>
#include <unistd.h>
#include <assert.h>
#include <sys/mman.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <wait.h>

int
main(void)
{
        void *buf;
        pid_t child;
        int ret, i;
        siginfo_t info;
        uint8_t *ubuf;
        size_t mapsz = sysconf(_SC_PAGESIZE) * 2;

        buf = mmap(NULL, mapsz, PROT_READ | PROT_WRITE,
            MAP_PRIVATE | MAP_ANON, -1, 0);
        assert(buf != MAP_FAILED);
        memset(buf, 'a', mapsz);

        ret = mlock(buf, mapsz);
        assert(ret == 0);

        ret = memcntl(buf, mapsz, MC_INHERIT_ZERO, 0, 0, 0);
        assert(ret == 0);

        child = fork();
        if (child == 0) {
                for (i = 0, ubuf = buf; i < mapsz; i++)
                        assert(ubuf[i] == 0);
                exit(0);
        }
        assert(child != -1);

        do {
                ret = waitid(P_PID, child, &info, WEXITED);
        } while (ret == -1 && errno == EINTR);
        assert(ret == 0);
        assert(info.si_pid == child);
        assert(info.si_status == 0);

        for (i = 0, ubuf = buf; i < mapsz; i++)
                assert(ubuf[i] == 'a');

        return (0);
}