1/*
2 * Copyright 2015-2020 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License").  You may not use
5 * this file except in compliance with the License.  You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10/* This must be the first #include file */
11#include "../async_local.h"
12
13#ifdef ASYNC_POSIX
14
15# include <stddef.h>
16# include <unistd.h>
17
18#define STACKSIZE       32768
19
20int ASYNC_is_capable(void)
21{
22    ucontext_t ctx;
23
24    /*
25     * Some platforms provide getcontext() but it does not work (notably
26     * MacOSX PPC64). Check for a working getcontext();
27     */
28    return getcontext(&ctx) == 0;
29}
30
31void async_local_cleanup(void)
32{
33}
34
35int async_fibre_makecontext(async_fibre *fibre)
36{
37#ifndef USE_SWAPCONTEXT
38    fibre->env_init = 0;
39#endif
40    if (getcontext(&fibre->fibre) == 0) {
41        fibre->fibre.uc_stack.ss_sp = OPENSSL_malloc(STACKSIZE);
42        if (fibre->fibre.uc_stack.ss_sp != NULL) {
43            fibre->fibre.uc_stack.ss_size = STACKSIZE;
44            fibre->fibre.uc_link = NULL;
45            makecontext(&fibre->fibre, async_start_func, 0);
46            return 1;
47        }
48    } else {
49        fibre->fibre.uc_stack.ss_sp = NULL;
50    }
51    return 0;
52}
53
54void async_fibre_free(async_fibre *fibre)
55{
56    OPENSSL_free(fibre->fibre.uc_stack.ss_sp);
57    fibre->fibre.uc_stack.ss_sp = NULL;
58}
59
60#endif
61