c - libspotify 在调用 sp_session_create 后因 segFault 而崩溃

Question

我正在测试 libspotify 库(Linux 版本 12.1.51 x86)，当我调用 sp_session_create() 时出现段错误，应用程序一直崩溃。

我没有应用程序 key ，也没有 Premium Spotify 帐户(还)，但这不应该是崩溃的原因，因为如果我没记错的话，有一个无效应用程序 key 的错误代码。

我的代码如下:

static uint_8_t g_appkey[] = {1, 2, 3};
static const char *username = "MyUsername";
static const char *password = "MyPassword";
static int logged_in;

static sp_session_callbacks session_callbacks;
static sp_session_config spconfig;

static void on_login(sp_session *session, sp_error error) {
    printf("Callback: on_login");
    if (error != SP_ERROR_OK) {
        printf("Error: Unable to login: %d\n", (int) error);
        exit(-1);
    }
    logged_in = 1;
}

static void on_main_thread_notified(sp_session *session) {
    printf("callback: on_main_thread_notified");
}

static void on_log_message(sp_session *session, const char *data) {
    printf("callback: on_log_message");
}

int main(int argc, char **argv) {
    sp_error error;
    sp_session *session;
    int next_timeout;

    /* struct fill */
    memset(&session_callbacks, 0, sizeof(session_callbacks));
    memset(&spconfig, 0, sizeof(spconfig)); 

    session_callbacks.logged_in          = &on_login;
    session_callbacks.notify_main_thread = &on_main_thread_notified;
    session_callbacks.log_message        = &on_log_message; 

    spconfig.api_version          = SPOTIFY_API_VERSION;
    spconfig.cache_location       = "tmp";
    spconfig.settings_location    = "tmp";
    spconfig.application_key      = g_appkey;
    spconfig.application_key_size = sizeof(g_appkey);
    spconfig.user_agent           = "spot";
    spconfig.callbacks            = &session_callbacks;

    /* session creation */  
    error = sp_session_create(&spconfig, &session);
    if (error != SP_ERROR_OK) {
        printf("ERROR: Unable to create spotify session: %s\n", sp_error_message(error));
        exit(-1);
    }

    /* log in */
    logged_in = 0;
    sp_session_login(session, username, password, 0, NULL);
    while(!logged_in) {
        sp_session_process_events(session, &next_timeout);
        sleep(next_timeout);
    }

    printf("Sucess!!");
    exit(0);
}

关于问题出在哪里的任何提示？

感谢您提供的任何帮助。

---

来自 gdb 的回溯:

[Thread debugging using libthread_db enabled]
[New Thread 0xb7fe6b70 (LWP 1839)]
[New Thread 0xb7f65b70 (LWP 1840)]

Program received signal SIGSEGV, Segmentation fault.
0x002b9b36 in sp_session_create () from /usr/local/lib/libspotify.so.12
(gdb) thread apply all backtrace

Thread 3 (Thread 0xb7f65b70 (LWP 1840)):
#0  0x0012d422 in __kernel_vsyscall ()
#1  0x003e6ce6 in nanosleep () at ../sysdeps/unix/syscall-template.S:82
#2  0x0041644c in usleep (useconds=10000) at ../sysdeps/unix/sysv/linux/usleep.c:33
#3  0x00293581 in ?? () from /usr/local/lib/libspotify.so.12
#4  0x00293990 in ?? () from /usr/local/lib/libspotify.so.12
#5  0x001d42b7 in ?? () from /usr/local/lib/libspotify.so.12
#6  0x004ae96e in start_thread (arg=0xb7f65b70) at pthread_create.c:300
#7  0x0041ca4e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:130

Thread 2 (Thread 0xb7fe6b70 (LWP 1839)):
#0  0x0012d422 in __kernel_vsyscall ()
#1  0x004b5245 in sem_wait@@GLIBC_2.1 () at ../nptl/sysdeps/unix/sysv/linux/i386/i686/../i486/sem_wait.S:80
#2  0x002178fa in ?? () from /usr/local/lib/libspotify.so.12
#3  0x001d42b7 in ?? () from /usr/local/lib/libspotify.so.12
#4  0x004ae96e in start_thread (arg=0xb7fe6b70) at pthread_create.c:300
#5  0x0041ca4e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:130

Thread 1 (Thread 0xb7fe78d0 (LWP 1836)):
#0  0x002b9b36 in sp_session_create () from /usr/local/lib/libspotify.so.12
#1  0x080487d5 in main ()
(gdb) 

Answer 1

问题已解决。

我从 spotify 获得了一个有效的应用程序 key ，测试了我的代码，现在它可以工作了。

似乎当前的 live libspotify 版本在输入无效的应用程序 key 时存在错误。