86 lines
2.8 KiB
C++
86 lines
2.8 KiB
C++
#include <cstdlib>
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#include "SharedMemory.h"
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#include <iostream>
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#include <fstream>
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key_t changedKey()
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{
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std::ofstream keyFile;
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keyFile.open("key.log", std::ofstream::out | std::ofstream::trunc);
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keyFile.clear();
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int newKey;
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std::cout << "Type in a new Key for the Shared Memory Segment" << std::endl;
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std::cout << "new Key#";
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std::cin >> newKey;
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std::cout <<"New Key is -> " << newKey << std::endl;
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keyFile << newKey;
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keyFile.close();
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return key_t(newKey);
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}
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std::string getAnswerFromUser()
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{
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std::cout <<"answer# ";
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std::string answer;
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std::cin >> answer;
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if(answer.compare("y") == 0 || answer.compare("n") == 0|| answer.compare("override") == 0) {
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return answer;
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} else {
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std::cout << "wrong input: pls answer with (y) for yes, (n) for no, or (override)\n";
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getAnswerFromUser();
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}
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return "-0";
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}
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void initSharedMemory(void) {
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if(impl.sharedMemoryKey != key_t(0)) {
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if (shmget(impl.sharedMemoryKey, Max_Memory_Size, IPC_CREAT | IPC_EXCL | 0666) < 0)
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{
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std::cout << "Shared Memory with Key: " << impl.sharedMemoryKey << " is already in use\n"
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<<"You can change the Key( type -> y or n ), or you can override the shared memory Segment(type -> override)\n";
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std::string answer = getAnswerFromUser();
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if(answer.compare("y") == 0)
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{
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impl.sharedMemoryKey = changedKey();
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std::cout << "new Try with Key:c " << impl.sharedMemoryKey << std::endl;
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initSharedMemory();
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} else if(answer.compare("n") == 0) {
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std::cout << "This will end shared memory" <<std::endl;
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exit(0);
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} else if(answer.compare("override") == 0) {
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deleteSharedMemory();
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initSharedMemory();
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}
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} else {
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std::cout << "Shared Memory is (Re-) allocated with Key: " << impl.sharedMemoryKey << std::endl;
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}
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} else {
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std::cerr <<"key -> " << impl.sharedMemoryKey << " is not allowed here " << std::endl;
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impl.sharedMemoryKey = changedKey();
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initSharedMemory();
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}
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}
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void deleteSharedMemory(int s)
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{
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std::cerr << "programm ended with Code: " << s << std::endl;
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if (shmctl(shmget(impl.sharedMemoryKey, 0, 0), IPC_RMID, 0) < 0 )
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{
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std::cerr << "Failed to remove shared Memory, maybe not existing: try cmd: ipcs, then delete with ipcrm -m $memID " << std::endl;
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} else {
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std::cout << "shared Memory deleted" << std::endl;
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}
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}
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void deleteSharedMemory(void)
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{
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if (shmctl(shmget(impl.sharedMemoryKey, 0, 0), IPC_RMID, 0) < 0 )
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{
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std::cerr << "Failed to remove shared Memory, maybe not existing: try cmd: ipcs " << std::endl;
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} else {
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std::cout << "shared Memory deleted" << std::endl;
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}
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}
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