zmq_socket（）是給分段錯誤

Question

我學習zeromq並具有以下的測試代碼：

void *context = (void *)zmq_ctx_new(); 

if (context == NULL) { 
    printf("context is null\n"); 
} else { 
    printf("context was created successfully\n"); 
} 

printf("connecting to the 0mq server\n"); 
void *responder = zmq_socket (context, ZMQ_REQ); 

printf("got socket\n"); 

if (responder == NULL) { 
    printf("responder is null\n"); 
} else { 
    printf("responder was created successfully\n"); 
} 

當我運行的代碼，它崩潰時zmq_socket()被調用。下面是輸出：

開始連接到 0mq服務器分段故障已成功創建0mq服務器環境（核心轉儲）

我不知道爲什麼zmq_socket()失敗。我試圖在Makefile中鏈接系列的開頭移動zmq庫。它仍然失敗。

任何幫助將不勝感激。

Answer 1

變化

void context = (void)zmq_ctx_new(); 

到

void *context = (void *)zmq_ctx_new(); 

而且，我想你的代碼，無效的情況下=（無效）zmq_ctx_new（）會導致編譯錯誤。

這是我的代碼，可以在我的OSX上工作。

gcc -o cli client.c -lzmq 
gcc -o srv server.c -lzmq 

client.c：

#include <zmq.h> 
#include <string.h> 
#include <stdio.h> 
#include <unistd.h> 

int main (void) 
{ 
    printf ("Connecting to hello world server…\n"); 
    void *context = (void *)zmq_ctx_new(); 
    void *requester = zmq_socket (context, ZMQ_REQ); 
    zmq_connect (requester, "tcp://localhost:5555"); 

    int request_nbr; 
    for (request_nbr = 0; request_nbr != 10; request_nbr++) { 
     char buffer [10]; 
     char snd[] = "hello"; 
     printf ("Sending Hello %d…\n", request_nbr); 
     zmq_send (requester, snd, sizeof(snd), 0); 
     zmq_recv (requester, buffer, 10, 0); 
     printf ("Received World %d\n", request_nbr); 
    } 
    zmq_close (requester); 
    zmq_ctx_destroy (context); 
    return 0; 
} 

server.c：

#include <zmq.h> 
#include <stdio.h> 
#include <unistd.h> 
#include <string.h> 
#include <assert.h> 

int main (void) 
{ 
    // Socket to talk to clients 
    void *context = zmq_ctx_new(); 
    void *responder = zmq_socket (context, ZMQ_REP); 
    int rc = zmq_bind (responder, "tcp://*:5555"); 
    assert (rc == 0); 

    while (1) { 
     int nrecv; 
     char buffer [10]; 
     nrecv = zmq_recv (responder, buffer, 10, 0); 
     printf ("[%d] Received %s\n", nrecv, buffer); 
     sleep (1);   // Do some 'work' 
     zmq_send (responder, "World", 5, 0); 
    } 
    return 0; 
}