example.c

#ifdef _WIN32
#    define WIN32_LEAN_AND_MEAN
#    define NOMINMAX
#    define _CRT_SECURE_NO_WARNINGS
#endif

#include "sentry.h"
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef NDEBUG
#    undef NDEBUG
#endif
#include <assert.h>

#ifdef SENTRY_PLATFORM_WINDOWS
#    include <synchapi.h>
#    define sleep_s(SECONDS) Sleep((SECONDS)*1000)
#else
#    include <signal.h>
#    include <unistd.h>
#    define sleep_s(SECONDS) sleep(SECONDS)
#endif

static sentry_value_t
before_send_callback(sentry_value_t event, void *hint, void *closure)
{
    (void)hint;
    (void)closure;

    // make our mark on the event
    sentry_value_set_by_key(
        event, "adapted_by", sentry_value_new_string("before_send"));

    // tell the backend to proceed with the event
    return event;
}

static sentry_value_t
discarding_before_send_callback(sentry_value_t event, void *hint, void *closure)
{
    (void)hint;
    (void)closure;

    // discard event and signal backend to stop further processing
    sentry_value_decref(event);
    return sentry_value_new_null();
}

static sentry_value_t
discarding_on_crash_callback(
    const sentry_ucontext_t *uctx, sentry_value_t event, void *closure)
{
    (void)uctx;
    (void)closure;

    // discard event and signal backend to stop further processing
    sentry_value_decref(event);
    return sentry_value_new_null();
}

static sentry_value_t
on_crash_callback(
    const sentry_ucontext_t *uctx, sentry_value_t event, void *closure)
{
    (void)uctx;
    (void)closure;

    // tell the backend to retain the event
    return event;
}

static void
print_envelope(sentry_envelope_t *envelope, void *unused_state)
{
    (void)unused_state;
    size_t size_out = 0;
    char *s = sentry_envelope_serialize(envelope, &size_out);
    printf("%s", s);
    sentry_free(s);
    sentry_envelope_free(envelope);
}

static bool
has_arg(int argc, char **argv, const char *arg)
{
    for (int i = 1; i < argc; i++) {
        if (strcmp(argv[i], arg) == 0) {
            return true;
        }
    }
    return false;
}

#ifdef CRASHPAD_WER_ENABLED
int
call_rffe_many_times()
{
    RaiseFailFastException(NULL, NULL, 0);
    RaiseFailFastException(NULL, NULL, 0);
    RaiseFailFastException(NULL, NULL, 0);
    RaiseFailFastException(NULL, NULL, 0);
    return 1;
}

typedef int (*crash_func)();

void
indirect_call(crash_func func)
{
    // This code always generates CFG guards.
    func();
}

static void
trigger_stack_buffer_overrun()
{
    // Call into the middle of the Crashy function.
    crash_func func = (crash_func)((uintptr_t)(call_rffe_many_times) + 16);
    __try {
        // Generates a STATUS_STACK_BUFFER_OVERRUN exception if CFG triggers.
        indirect_call(func);
    } __except (EXCEPTION_EXECUTE_HANDLER) {
        // CFG fast fail should never be caught.
        printf(
            "If you see me, then CFG wasn't enabled (compile with /guard:cf)");
    }
    // Should only reach here if CFG is disabled.
    abort();
}

static void
trigger_fastfail_crash()
{
    // this bypasses WINDOWS SEH and will only be caught with the crashpad WER
    // module enabled
    __fastfail(77);
}

#endif // CRASHPAD_WER_ENABLED

#ifdef SENTRY_PLATFORM_AIX
// AIX has a null page mapped to the bottom of memory, which means null derefs
// don't segfault. try dereferencing the top of memory instead; the top nibble
// seems to be unusable.
static void *invalid_mem = (void *)0xFFFFFFFFFFFFFF9B; // -100 for memset
#else
static void *invalid_mem = (void *)1;
#endif

static void
trigger_crash()
{
    memset((char *)invalid_mem, 1, 100);
}

int
main(int argc, char **argv)
{
    sentry_options_t *options = sentry_options_new();

    if (has_arg(argc, argv, "disable-backend")) {
        sentry_options_set_backend(options, NULL);
    }

    // this is an example. for real usage, make sure to set this explicitly to
    // an app specific cache location.
    sentry_options_set_database_path(options, ".sentry-native");

    sentry_options_set_auto_session_tracking(options, false);
    sentry_options_set_symbolize_stacktraces(options, true);

    sentry_options_set_environment(options, "development");
    // sentry defaults this to the `SENTRY_RELEASE` env variable
    if (!has_arg(argc, argv, "release-env")) {
        sentry_options_set_release(options, "test-example-release");
    }

    if (has_arg(argc, argv, "log")) {
        sentry_options_set_debug(options, 1);
    }

    if (has_arg(argc, argv, "attachment")) {
        // assuming the example / test is run directly from the cmake build
        // directory
        sentry_options_add_attachment(options, "./CMakeCache.txt");
    }

    if (has_arg(argc, argv, "stdout")) {
        sentry_options_set_transport(
            options, sentry_transport_new(print_envelope));
    }

    if (has_arg(argc, argv, "capture-transaction")) {
        sentry_options_set_traces_sample_rate(options, 1.0);
    }

    if (has_arg(argc, argv, "child-spans")) {
        sentry_options_set_max_spans(options, 5);
    }

    if (has_arg(argc, argv, "before-send")) {
        sentry_options_set_before_send(options, before_send_callback, NULL);
    }

    if (has_arg(argc, argv, "discarding-before-send")) {
        sentry_options_set_before_send(
            options, discarding_before_send_callback, NULL);
    }

    if (has_arg(argc, argv, "on-crash")) {
        sentry_options_set_on_crash(options, on_crash_callback, NULL);
    }

    if (has_arg(argc, argv, "discarding-on-crash")) {
        sentry_options_set_on_crash(
            options, discarding_on_crash_callback, NULL);
    }

    if (has_arg(argc, argv, "override-sdk-name")) {
        sentry_options_set_sdk_name(options, "sentry.native.android.flutter");
    }

    sentry_init(options);

    if (!has_arg(argc, argv, "no-setup")) {
        sentry_set_transaction("test-transaction");
        sentry_set_level(SENTRY_LEVEL_WARNING);
        sentry_set_extra("extra stuff", sentry_value_new_string("some value"));
        sentry_set_extra("…unicode key…",
            // https://xkcd.com/1813/ :-)
            sentry_value_new_string("őá…–🤮🚀¿ 한글 테스트"));
        sentry_set_tag("expected-tag", "some value");
        sentry_set_tag("not-expected-tag", "some value");
        sentry_remove_tag("not-expected-tag");

        sentry_value_t context = sentry_value_new_object();
        sentry_value_set_by_key(
            context, "type", sentry_value_new_string("runtime"));
        sentry_value_set_by_key(
            context, "name", sentry_value_new_string("testing-runtime"));
        sentry_set_context("runtime", context);

        sentry_value_t user = sentry_value_new_object();
        sentry_value_set_by_key(user, "id", sentry_value_new_int32(42));
        sentry_value_set_by_key(
            user, "username", sentry_value_new_string("some_name"));
        sentry_set_user(user);

        sentry_value_t default_crumb
            = sentry_value_new_breadcrumb(NULL, "default level is info");
        sentry_add_breadcrumb(default_crumb);

        sentry_value_t debug_crumb
            = sentry_value_new_breadcrumb("http", "debug crumb");
        sentry_value_set_by_key(
            debug_crumb, "category", sentry_value_new_string("example!"));
        sentry_value_set_by_key(
            debug_crumb, "level", sentry_value_new_string("debug"));
        sentry_add_breadcrumb(debug_crumb);

        sentry_value_t nl_crumb
            = sentry_value_new_breadcrumb(NULL, "lf\ncrlf\r\nlf\n...");
        sentry_value_set_by_key(
            nl_crumb, "category", sentry_value_new_string("something else"));
        sentry_add_breadcrumb(nl_crumb);
    }

    if (has_arg(argc, argv, "start-session")) {
        sentry_start_session();
    }

    if (has_arg(argc, argv, "overflow-breadcrumbs")) {
        for (size_t i = 0; i < 101; i++) {
            char buffer[4];
            snprintf(buffer, 4, "%zu", i);
            sentry_add_breadcrumb(sentry_value_new_breadcrumb(0, buffer));
        }
    }

    if (has_arg(argc, argv, "capture-multiple")) {
        for (size_t i = 0; i < 10; i++) {
            char buffer[10];
            snprintf(buffer, 10, "Event #%zu", i);

            sentry_value_t event = sentry_value_new_message_event(
                SENTRY_LEVEL_INFO, NULL, buffer);
            sentry_capture_event(event);
        }
    }

    if (has_arg(argc, argv, "reinstall")) {
        sentry_reinstall_backend();
    }

    if (has_arg(argc, argv, "sleep")) {
        sleep_s(10);
    }

    if (has_arg(argc, argv, "crash")) {
        trigger_crash();
    }
#ifdef CRASHPAD_WER_ENABLED
    if (has_arg(argc, argv, "fastfail")) {
        trigger_fastfail_crash();
    }
    if (has_arg(argc, argv, "stack-buffer-overrun")) {
        trigger_stack_buffer_overrun();
    }
#endif
    if (has_arg(argc, argv, "assert")) {
        assert(0);
    }
    if (has_arg(argc, argv, "abort")) {
        abort();
    }
#ifdef SENTRY_PLATFORM_UNIX
    if (has_arg(argc, argv, "raise")) {
        raise(SIGSEGV);
    }
    if (has_arg(argc, argv, "kill")) {
        kill(getpid(), SIGSEGV);
    }
#endif

    if (has_arg(argc, argv, "capture-event")) {
        sentry_value_t event = sentry_value_new_message_event(
            SENTRY_LEVEL_INFO, "my-logger", "Hello World!");
        if (has_arg(argc, argv, "add-stacktrace")) {
            sentry_event_value_add_stacktrace(event, NULL, 0);
        }
        sentry_capture_event(event);
    }
    if (has_arg(argc, argv, "capture-exception")) {
        sentry_value_t exc = sentry_value_new_exception(
            "ParseIntError", "invalid digit found in string");
        if (has_arg(argc, argv, "add-stacktrace")) {
            sentry_value_set_stacktrace(exc, NULL, 0);
        }
        sentry_value_t event = sentry_value_new_event();
        sentry_event_add_exception(event, exc);

        sentry_capture_event(event);
    }

    if (has_arg(argc, argv, "capture-transaction")) {
        sentry_transaction_context_t *tx_ctx
            = sentry_transaction_context_new("little.teapot",
                "Short and stout here is my handle and here is my spout");

        if (has_arg(argc, argv, "unsample-tx")) {
            sentry_transaction_context_set_sampled(tx_ctx, 0);
        }
        sentry_transaction_t *tx
            = sentry_transaction_start(tx_ctx, sentry_value_new_null());

        if (has_arg(argc, argv, "error-status")) {
            sentry_transaction_set_status(
                tx, SENTRY_SPAN_STATUS_INTERNAL_ERROR);
        }

        if (has_arg(argc, argv, "child-spans")) {
            sentry_span_t *child
                = sentry_transaction_start_child(tx, "littler.teapot", NULL);
            sentry_span_t *grandchild
                = sentry_span_start_child(child, "littlest.teapot", NULL);

            if (has_arg(argc, argv, "error-status")) {
                sentry_span_set_status(child, SENTRY_SPAN_STATUS_NOT_FOUND);
                sentry_span_set_status(
                    grandchild, SENTRY_SPAN_STATUS_ALREADY_EXISTS);
            }

            sentry_span_finish(grandchild);
            sentry_span_finish(child);
        }

        sentry_transaction_finish(tx);
    }

    // make sure everything flushes
    sentry_close();

    if (has_arg(argc, argv, "sleep-after-shutdown")) {
        sleep_s(1);
    }

    if (has_arg(argc, argv, "crash-after-shutdown")) {
        trigger_crash();
    }
}