SIGINT detection works now. adding some documentatios, still need to find memoty leaks
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1469f517d6
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1bca3de24d
1 changed files with 72 additions and 37 deletions
65
main.c
65
main.c
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@ -20,6 +20,8 @@ char** ReadTokens(FILE* stream, int* writeToFile) ;
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void FreeTokens(char** tokens) ;
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void FreeTokens(char** tokens) ;
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void checkIfQuit(char* word);
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void checkIfQuit(char* word);
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int getFileNameIndex(char** args);
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int getFileNameIndex(char** args);
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void freeRemainderInArr(char** args, int beforLast);
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int main()
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int main()
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@ -35,18 +37,20 @@ int main()
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if(getUserName(user_n) == ERROR)
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if(getUserName(user_n) == ERROR)
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goto quit;
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goto quit;
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signal(SIGINT, SIG_IGN); // ignore SIGINT
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while(1)
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while(1)
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{
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{
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printf("%d %s@%s$ ",exitCode, user_n, host_n);
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printf("%d %s@%s$ ",exitCode, user_n, host_n); // Print Prompt
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args = ReadTokens(stdin, &writeToFile);
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args = ReadTokens(stdin, &writeToFile); // get user command and tokenize it to args, check if there is a redirect to file.
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if(args != NULL)
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if(args != NULL) // if user did enter a command do the following
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{
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{
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exitCode = runExec(args, writeToFile);
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exitCode = runExec(args, writeToFile); // fork and run the process, return child exit code
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FreeTokens(args); //in case of error while trying to create process - this method will free the memory already
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FreeTokens(args); //in case of error while trying to create process - this method will free the memory already
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if(exitCode == ERROR)
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if(exitCode == ERROR) // in case we need to exit.
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goto quit;
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goto quit;
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}
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}
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writeToFile = false;
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writeToFile = false; // set the "boolean" back to default
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}
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}
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quit:
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quit:
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@ -55,25 +59,35 @@ int main()
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return 0;
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return 0;
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}
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}
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int getHostName(char* host)
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/**
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{
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* Atemting to get the host name from the system
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* @param host - the string that will hold the host name
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* @return 0 if all went well, -1 (ERROR) otherwise
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*/
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int getHostName(char* host)
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{
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if(gethostname(host, 10) != 0)
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if(gethostname(host, 10) != 0)
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{
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{
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fprintf(stderr, "%s\n", "Error: while getting host name");
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fprintf(stderr, "%s\n", "Error: while getting host name");
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return -1;
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return ERROR;
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}
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}
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return 0;
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return 0;
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}
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}
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int getUserName(char* name)
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/**
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{
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* Atemting to get the user name from the system
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* @param host - the string that will hold the user name
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* @return 0 if all went well, -1 (ERROR) otherwise
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*/
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int getUserName(char* name)
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{
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if(getlogin_r(name, 10) != 0)
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if(getlogin_r(name, 10) != 0)
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{
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{
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fprintf(stderr, "%s\n", "Error: while getting User name");
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fprintf(stderr, "%s\n", "Error: while getting User name");
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return ERROR;
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return ERROR;
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}
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}
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return 0;
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return 0;
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}
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}
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/**
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/**
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* This function will atempt to create a new Process.
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* This function will atempt to create a new Process.
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@ -100,18 +114,30 @@ int getUserName(char* name)
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}
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}
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else if(pid == 0) // child
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else if(pid == 0) // child
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{
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{
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signal(SIGINT, SIG_DFL); // set the child SIGINT handler to default! -> ^C will kill child but not father.
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if(writeToFile == true)
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if(writeToFile == true)
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{
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{
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int i_lastArg = getFileNameIndex(args);
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int i_lastArg = getFileNameIndex(args);
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char* fileName = (char *)malloc(strlen(args[i_lastArg])*sizeof(char));
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char* fileName = (char *)malloc(strlen(args[i_lastArg])*sizeof(char));
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strcpy(fileName, args[i_lastArg]);
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strcpy(fileName, args[i_lastArg]);
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args[i_lastArg - 1] = NULL;
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freeRemainderInArr(args, i_lastArg);
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int fd = open(fileName, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR);
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int fd = open(fileName, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR);
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if(fd >= 0)
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{
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dup2(fd, 1); // make stdout go to file
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dup2(fd, 1); // make stdout go to file
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dup2(fd, 2); // make stderr go to file
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close(fd);
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close(fd);
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}
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else
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{
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fprintf(stderr, "%s%s%s\n", "Unable to open file ",fileName," : printing out put to default stdout:");
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}
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}
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}
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if(execv(path, args) != 0)
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if(execv(path, args) != 0)
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{
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{
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fprintf(stderr, "%s%s%s\n", "myTerminal: ", args[0] ,": command not found");
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fprintf(stderr, "%s%s%s\n", "myTerminal: ", args[0] ,": command not found");
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@ -120,6 +146,7 @@ int getUserName(char* name)
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}
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}
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else //pid > 0 father
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else //pid > 0 father
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waitpid(pid,&status,0);
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waitpid(pid,&status,0);
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free(path);
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free(path);
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free(exe);
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free(exe);
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if(status == EXIT_1) //in my computer exit(1) returns 256 - ex demands wanted 255
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if(status == EXIT_1) //in my computer exit(1) returns 256 - ex demands wanted 255
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@ -237,3 +264,11 @@ int getFileNameIndex(char** args)
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i++;
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i++;
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return i-1;
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return i-1;
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}
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}
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void freeRemainderInArr(char** args, int beforLast)
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{
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free(args[beforLast+1]);
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args[beforLast] = NULL;
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free(args[beforLast]);
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args[beforLast - 1] = NULL;
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}
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