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Socket超时时会崩溃!try catch语句也不能捕获!

-(void)inte易做图ceForsock:(NSString *)filename Path:(NSString *)path{
    
    int sock = 0;
    
    sock = [self sockInit:sock];
    [self upData:sock filename:[filename UTF8String] Path:[path UTF8String]];
    close(sock);
    NSLog(@"socke上传成功");   
}



-(int)upData:(int)sock filename:(const char *)filename Path:(const char *)path{
    
    int local;
    int fd;
    int ret;
    int readSize;
    int timeOutVal = 0;
    int len = 0;
    char headSize[10];
    char recvInfo[35];
    char sendFilename[50];
    char dir[256];
    char buf[8196];

    
#ifdef DebugLog
    
    NSLog(@"filename is : %s",filename);
    NSLog(@"dir is      : %s",path);
    
#endif
    
    fd_set wfds;
    struct timeval tv;
    
    FD_ZERO(&wfds);
    FD_SET(sock, &wfds);
    
    tv.tv_sec = 200;
    tv.tv_usec = 0;
    
    memset(dir, 0, 256);
    memset(sendFilename, 0, 50);
    memset(recvInfo, 0, 35);
    
    
    strcat(sendFilename, filename);
    strcat(dir, path);
    
    sendFilename[strlen(sendFilename)] = '*';
    
    send(sock, "0000000064", 10, 0);
    send(sock, "4000", 4, 0);
    send(sock, sendFilename, 50, 0);
    
    recv(sock, recvInfo, 34, 0);
    local = atoi(recvInfo+14);
    
    if(strncmp(recvInfo+10, "4001", 4) == 0){
        
        fd = open(dir, O_RDONLY);
        if(fd < 0){
            
            printf("open failed in %s and %d\n",__FUNCTION__,__LINE__);
            return 0;
        }
        
        lseek(fd, local, SEEK_SET);
//        printf("%d\n",local);
        while (1) {
            
            ret = select(sock+1, NULL, &wfds, NULL, &tv);
            if(ret < 0){
                
                printf("select failed in %s and %d\n",__FUNCTION__,__LINE__);
                close(fd);
                return 0;
                
            }else if(ret == 0){
                
                if(timeOutVal == 5){
                    
                    timeOutVal = 0;
                    close(fd);
                    return 0;
                    
                }
                
                timeOutVal++;
                continue;
            }
            
            if(FD_ISSET(sock, &wfds)){
                
                memset(buf, 0, 8196);
                
                readSize = read(fd, buf, 8196);
                
                if((readSize <= 0)){
                    
                    
                    
                    memset(headSize, '0', 10);
                    iTos(headSize, readSize);
                    
                    send(sock, "0000000034", 10, 0);
                    send(sock, "4003", 4, 0);
                    send(sock, headSize, 20, 0);
                    
                    
                    
                    //len += readSize;
#ifdef DebugLog
                    
                    printf("%s\n",headSize);
                    printf("readSize : %d\n",readSize);
                    printf("len : %d\n",len);
                    
#endif
                    recv(sock, recvInfo, 34, 0);
                    
                    
                    if(strncmp(recvInfo+10, "4004", 4) == 0){
                        
                        close(fd);
                        return 0;
                        
                    }else if(strncmp(recvInfo+10, "4002", 4) == 0){
                        
                        continue;
                    }
                }
                /*
                 if(readSize <= 0){
                 
                 close(fd);
                 return 0;
                 }
                 */
                memset(headSize, '0', 10);
                
                iTos(headSize, readSize+10+4);
                
//                printf("handSize : %s\n",headSize);
                
                send(sock, headSize, 10, 0);
                send(sock, "4002", 4, 0);
                send(sock, buf, readSize, 0);
                
                len += readSize;
//                printf("readSize : %d\n",readSize);
                
                recv(sock, recvInfo, 34, 0);
                
                
                if(strncmp(recvInfo+10, "4004", 4) == 0){
                    
                    close(fd);
                    return 0;
                    
                }else if(strncmp(recvInfo+10, "4002", 4) == 0){
                    
                    continue;
                }
                
            }
            
        }
        
    }
    return  0;
    
}
纯C写的 ,Socket超时时会崩溃!try catch语句也不能捕获!请问有什么方法解决呢?请大牛出来帮忙!  --------------------编程问答-------------------- 是不是收到一个SIG_PIPE的信号,,使用signal函数捕获这个信号, --------------------编程问答-------------------- send和recv的时候都判断一下是否成功,既然超时了,就未必会成功,后续的一些字符串操作应该会引起异常。
调试时看不到异常的断点? --------------------编程问答-------------------- http://blog.sina.com.cn/s/blog_7011f21c0101coh2.html

在使用socket的send函数时,如果此时服务器断开连接,socket将会收到broken pipe的错误。我们可以判断类似的错误来进行重连,但是在这之前系统就会发出SIGPIPE的信号,导致我们的程序crash。所以我们需要先屏蔽sigpipe的信号

struct sigaction sa;

struct sigaction osa;

sa.sa_handler = custom_handle;

sigaction(SIGPIPE, &sa, &osa);


这样我们在收到系统的SIGPIPE信号后就不会crash,而是会跑到我们自定义的handle函数里面


当然我们还不能忘记在socket不使用的时候还原系统的信号设置

sigaction(SIGPIPE, &osa, 0);


这时我们的程序虽然不会crash,但是在debug会非常恼人的收到系统触发的debug中断,使得我们的调试非常烦躁,我个人的解决方法是调试时候在入口设置断点,是debug console进入 gdb或是lldb的状态 然后忽略SIGPIPE信号的stop


gdb

handle SIGPIPE nostop


lldb

process handle SIGPIPE -s false
--------------------编程问答-------------------- 我之前碰到过一次网络超时闪退,后来查看信号是sig 9,并不是崩溃,是进程被系统kill掉了。
补充:移动开发 ,  iPhone
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