使用IPC Sys V.

Question

我有一个服务器和一个客户端，并希望通过使用Sys V IPC将文件从客户端发送到服务器。我的问题是发送文件，服务器正在创建文件但是停止在msgrcv_3无效的参数（最后在服务器中执行）。也许有人有个主意。

服务器片段：

      while(1){
    int ausgabe=0;
  /* Messageq */ 
  if ((msqid = msgget(server_key, IPC_CREAT|IPC_EXCL|0666)) < 0){
    perror("msgget_1");
    exit(EXIT_FAILURE);
  }

  /*  Message Empfangen */
  if((msreturn = msgrcv(msqid, (void*)&name, sizeof(struct name),0,0))<0){
    perror("msgrcv_1");
    exit(EXIT_FAILURE);
  }  

    result.exists = FileExists(name.file_name);
    printf("%d\n", result.exists);

  /* Message Versenden*/
  if((msreturn = msgsnd(msqid, (void*)&result, sizeof(struct result),0))<0){
    perror("msgsnd_1");
    exit(EXIT_FAILURE);
  }
   if(result.exists == 42){
    if((msreturn = msgrcv(msqid, (void*)&data, sizeof(struct data),0,0))<0){
      perror("msgrcv_2");
      exit(EXIT_FAILURE);
    }
    creatfile = open(data.file_name, O_WRONLY | O_CREAT| O_EXCL , 0);
      if(creatfile == -1){
        perror("creratfile");
        exit(EXIT_FAILURE);
      }
    do{
      if(msgrcv(msqid, (void*)&msg_body, sizeof(struct msg_body),0,0)<0){
        perror("msgrcv_3");
        exit(EXIT_FAILURE); 
      }
      buff_blub = write(creatfile, &msg_body.buffer, msg_body.bufsize);
      if (buff_blub < 0){
        perror("write");
        exit(EXIT_FAILURE);
      }
      ausgabe = ausgabe+msg_body.bufsize;
    }
    while(ausgabe != data.datasize);
      chmod(data.file_name, 0644);
  }  
}

客户端代码：

        strncpy(name.file_name, argv[2], sizeof(name.file_name) - 1);

  /* Message Versenden*/
    if((msreturn = msgsnd(msqid, (void*)&name, sizeof(struct name),0))<0){
        perror("msgsnd");
        exit(EXIT_FAILURE);
    }
  /*  Message Empfangen */
    if((msreturn = msgrcv(msqid, (void*)&result, sizeof(struct result),0,0))<0){
        perror("msgrcv");
        exit(EXIT_FAILURE);
    }  

    if(result.exists == 1){
        puts("File already exists");
        exit(EXIT_FAILURE);
    }
    else if(result.exists == 42){
        file_read = open(argv[1], O_RDONLY);
        if (file_read > 0){
            if (fstat(file_read, &sb)==-1){
                perror("fstat");
                return EXIT_FAILURE;
            }
            strncpy(data.file_name, argv[2], sizeof(data.file_name) - 1);
            data.datasize = sb.st_size;
            data.c_pid = getpid();
            if((msreturn = msgsnd(msqid, (void*)&data, sizeof(struct data),0))<0){
                perror("msgsnd");
                exit(EXIT_FAILURE);
            }
            while((file_buffer = read (file_read, &msg_body.buffer, BUF_SIZE)) > 0){
                msg_body.bufsize = file_buffer;
                msg_body.prio = 2;
                if((msreturn = msgsnd(msqid, (void*)&msg_body, sizeof(struct msg_body),0))<0){
                    perror("msgsnd");
                    exit(EXIT_FAILURE);
                }   
            }
        close(file_read);
        }

    }
return 1;
}

结构：

#include <unistd.h>
#if !defined(__MSGBSP_H)
#define __MSGBSP_H
#define BUF_SIZE 1024


struct data {
  char file_name[255];
  ssize_t datasize;
  long c_pid;
};
struct name {
    char file_name[255];
};
struct result {
  int exists;
};
struct header {
  int size;
};
struct msg_body {
    long prio;
    ssize_t bufsize;
    char buffer[BUF_SIZE];
};
#endif