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/*-
* Copyright (c) 2025 Raptor Computing Systems, LLC
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <stdio.h>
#include <stdlib.h>
#include <ucontext.h>
#include <errno.h>
#include <atf-c.h>
#define STACK_SIZE (64ull << 10)
static volatile int callback_reached = 0;
static ucontext_t uctx_save, uctx_switch;
static void swapcontext_callback()
{
// Increment callback reached variable
// If this is called multiple times, we will fail the test
// If this is not called at all, we will fail the test
callback_reached++;
}
ATF_TC(swapcontext_basic);
ATF_TC_HEAD(swapcontext_basic, tc)
{
atf_tc_set_md_var(tc, "descr",
"Verify basic functionality of swapcontext");
}
ATF_TC_BODY(swapcontext_basic, tc)
{
char *stack;
int res;
stack = malloc(STACK_SIZE);
ATF_REQUIRE_MSG(stack != NULL, "malloc failed: %s", strerror(errno));
res = getcontext(&uctx_switch);
ATF_REQUIRE_MSG(res == 0, "getcontext failed: %s", strerror(errno));
uctx_switch.uc_stack.ss_sp = stack;
uctx_switch.uc_stack.ss_size = STACK_SIZE;
uctx_switch.uc_link = &uctx_save;
makecontext(&uctx_switch, swapcontext_callback, 0);
res = swapcontext(&uctx_save, &uctx_switch);
ATF_REQUIRE_MSG(res == 0, "swapcontext failed: %s", strerror(errno));
ATF_REQUIRE_MSG(callback_reached == 1,
"callback failed, reached %d times", callback_reached);
}
ATF_TP_ADD_TCS(tp)
{
ATF_TP_ADD_TC(tp, swapcontext_basic);
return (atf_no_error());
}
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