ElectronixTM
5dbe188b08
В задании просят починить файлы, но фактически они даются нам уже рабочими, поэтому мне нужно только разобраться с тем, что происходит внутри
100 lines
2.1 KiB
C
100 lines
2.1 KiB
C
#include <stdio.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/msg.h>
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#define MQ_KEY1 1234L
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#define MQ_KEY2 2345L
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#define MAXMESGDATA 4096
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struct mymesg {
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long mesg_len;
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long mesg_type;
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char mesg_data[MAXMESGDATA];
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};
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void client(int readid, int writeid);
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ssize_t mesg_send(int id, struct mymesg *mptr);
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ssize_t mesg_recv(int id, struct mymesg *mptr);
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int main(int argc,char **argv)
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{
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int readid, writeid;
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if((writeid=msgget(MQ_KEY1,0666)) < 0)
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{
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printf("Client: can not get writeid!\n");
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exit(1);
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}
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printf("Client:writeid=%d\n",writeid);
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if((readid=msgget(MQ_KEY2,0666)) < 0)
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{
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printf("Client: can not get readid!\n");
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exit(1);
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}
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printf("Client: readid=%d\n",readid);
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client(readid,writeid);
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if((msgctl(readid,IPC_RMID, NULL)) < 0)
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{
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printf("Client: can not delete massage queue2!\n"); exit(1);
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}
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if((msgctl(writeid,IPC_RMID, NULL)) < 0)
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{
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printf("Client: can not delete massage queue1!\n"); exit(1);
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}
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exit(0);
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}
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void client(int readid, int writeid)
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{
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size_t len;
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ssize_t n;
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struct mymesg ourmesg;
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printf("Client:readid=%d writeid=%d\n",readid,writeid);
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printf("Input file name, please\n");
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fgets(ourmesg.mesg_data,MAXMESGDATA, stdin);
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len=strlen(ourmesg.mesg_data);
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if(ourmesg.mesg_data[len-1]=='\n') len--;
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ourmesg.mesg_len=len;
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ourmesg.mesg_type=1;
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printf("Client: %s\n",ourmesg.mesg_data);
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mesg_send(writeid,&ourmesg);
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printf("Client: tvk before recv!\n");
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while((n= mesg_recv(readid, &ourmesg))>0)
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//n= mesg_recv(readid, &ourmesg);
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write(1,ourmesg.mesg_data, n);
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}
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ssize_t mesg_send(int id, struct mymesg *mptr)
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{
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return(msgsnd(id, &(mptr->mesg_type),mptr->mesg_len, 0));
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}
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ssize_t mesg_recv(int id, struct mymesg *mptr)
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{
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ssize_t n;
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n=msgrcv(id, &(mptr->mesg_type),MAXMESGDATA,mptr->mesg_type, 0);
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mptr->mesg_len=n;
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printf("Client: n=%d\n",n);
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return(n);
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}
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