int main(void) {
int chat;
char chatmsg;
pid_t pid;
int file;
int i = 0;
int child_status;
if(!(file = open("file.txt", O_CREAT|O_RDWR|O_APPEND))) {
exit(-1);
}
pid = fork();
if(pid == 0) {
chat = OpenChatFellow();
while(read(chat,&chatmsg,1) == 1) {
write(STDOUT_FILENO, &chatmsg, 1);
write(file, &chatmsg, 1);
i++;
}
close(chat);
exit(i);
}
else {
while(read(STDIN_FILENO, &chatmsg, 1) == 1) {
write(STDOUT_FILENO, &chatmsg, 1);
if(chatmsg == 'q') {
break;
}
}
/* wait for the child process */
wait(&child_status);
printf("number of characters written by child process: %d\n", WEXITSTATUS(child_status));
printf("dumping file contents...\n");
/* go to the beginning of the file and dump the content to stdout */
lseek(file, 0L, SEEK_SET);
while(read(file,&chatmsg,1) == 1) {
write(STDOUT_FILENO, &chatmsg, 1);
if(i%7 == 6) {
write(STDOUT_FILENO, "\n", 1);
}
i++;
}
printf("\ndone\n");
}
close(file);
return 0;
}
int main(int argc, const char * argv[])
{
int fellow_desc,r;
char chr_fellow = '\0',chr_own;
fellow_desc=OpenChatFellow();
pid_t pid;
pid=fork();
//child
if(pid==0)
{
while ((r=read(fellow_desc, &chr_fellow, 1))>0) {
write(1,&chr_fellow,1);
}
exit(0);
}
//parent
while(chr_own!='q'&&chr_own!='Q'){
read(0,&chr_own,1);
write(1,&chr_own,1);
}
if(wait(NULL)>0){
printf("\nchild terminted!\n");
}
return 0;
}
int main(void){
/*//printf("i");
//char ch='2';
//fflush(stdout);
//write(1,'1',1);
while(1){
write(1,&ch,1);
}*/
int fellow_desc;
char char_fellow;
int n;
fellow_desc=OpenChatFellow();
n=read(fellow_desc,&char_fellow,1);
while(n>0){
write(1,&char_fellow,1);
n=read(fellow_desc,&char_fellow,1);
}
close(fellow_desc);
return 0;
}
int main(void) {
pid_t childPid = -1;
int status;
int fellow_desc = -1;
int file_flags;
int result = 0;
char fellow_chr;
char keyboard_chr;
fellow_desc = OpenChatFellow();
childPid = fork();
if (childPid > 0) { //this is parent process
/* read characters from the terminal
* if q or Q is entered, stop reading from the terminal
* wait for child process to terminate
* display "Child terminated"
*/
//change STDOUT_FILENO file descriptor from blocked mode to unblocked mode
file_flags = fcntl(STDOUT_FILENO, F_GETFL);
file_flags = file_flags | O_NONBLOCK;
fcntl(STDOUT_FILENO, F_SETFL, file_flags);
do {
result = read(STDIN_FILENO, &keyboard_chr, 1);
if (result != -1)
write(STDOUT_FILENO, &keyboard_chr, 1);
} while (keyboard_chr != 'Q' && keyboard_chr != 'q');
printf("\nWait for child process to terminate.\n");
wait(&status); //wait for child process to terminate
printf("\nChild terminated.\n");
close(STDOUT_FILENO);
} else if (childPid == 0) { //this is child process
/* read the inputs from the chat fellow
* display the input character to the terminal
* write the characters read to a file
* terminate if eof is encountered
*/
int fd = -1;
fd = open("/tmp/file.txt", O_CREAT | O_WRONLY, S_IRUSR | S_IWUSR);
if (fd == -1 ) {
perror("Open");
exit(EXIT_FAILURE);
}
do {
result = read(fellow_desc, &fellow_chr, 1);
if (result != -1) {
write(STDOUT_FILENO, &fellow_chr, 1);
write(fd, &fellow_chr, 1);
}
} while (fellow_chr != 'z');
close(fd);
close(fellow_desc);
exit(EXIT_SUCCESS);
} else
perror("fork() error");
return EXIT_SUCCESS;
}
int main(void){
/*//printf("i");
//char ch='2';
//fflush(stdout);
//write(1,'1',1);
while(1){
write(1,&ch,1);
}*/
int fellow_desc;
char chr_fellow;
char chr_kb;
int file_flags,result;
fellow_desc=OpenChatFellow();
//put keyboard to unblocked mode
file_flags=fcntl(0,F_GETFL); // read current file flags
file_flags=file_flags|O_NONBLOCK; // add o_NONBLOCK bit
fcntl(0,F_SETFL,file_flags); //write new flags back
file_flags=fcntl(fellow_desc,F_GETFL);
file_flags=file_flags|O_NONBLOCK;
fcntl(fellow_desc,F_SETFL,file_flags);
while(1)
{
//keyboard
result=read(0,&chr_kb,1);
if(result>0)
{
if(chr_kb=='Q'||chr_kb=='q')
exit(0);
else{
printf("%c",chr_kb);
fflush(stdout);
}
}
if(result==-1 && errno!=EAGAIN)
perror("keyboard error");
//Fellow input
result=read(fellow_desc,&chr_fellow,1);
if(result>0)
{
print("%c",chr_fellow);
fflush(stdout);
}
if (result==-1 && errno!=EAGAIN)
perror("Fellow error");
if(result==0) //End of file
exit(0);
}
/*n=read(fellow_desc,&char_fellow,1);
while(n>0){
write(1,&char_fellow,1);
n=read(0,&chr,1);
if (n>0)
write(1,&chr,1);
if (n==-1 && errno !=EAGAIN)
perror("keyboard read error!");
// we don't care the situation where n==-1 and errno==EAGAIN
n=read(fellow_desc,&char_fellow,1);
}*/
return EXIT_SUCCESS;
}
