How to keep program unclosed after ctr+c in named pipe? - c

Question

I have 2 programs.
One is server one is client. The Client sending string to the server, the server is swapping the string and return to the client.
the problems I have is when I pressing ctr+c the program(client) closed.(I'm using threads because I have been asking for.)
So how can I keep the program unclosed after ctr+c?
when clicking enter this is the right result and waiting for the server.
when entering ctl+c the program closed and cannot running server.c
The client.
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <time.h>
#define MAX_BUF 1024
// client
int main()
{
int fd;
char *myfifo = "myfifo";
char str[MAX_BUF];
printf("Input string: ");
fgets(str, MAX_BUF, stdin);
str[strlen(str) - 1] = '\0';
if (mkfifo("myfifo", 0777) == -1)
{
if (errno != EEXIST)
{
printf("Could not create fifo file\n");
return 1;
}
}
/* create the FIFO (named pipe) */
fd = open(myfifo, O_WRONLY);
if (fd == -1)
return 2;
if (write(fd, str, MAX_BUF) == -1)
return 3;
close(fd);
fd = open(myfifo, O_RDONLY);
read(fd, str, MAX_BUF);
printf("%s\n", str);
/* remove the FIFO */
unlink(myfifo);
return 0;
}
The server
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <time.h>
#include <pthread.h>
#define MAX_BUF 1024
// server
// creatring struct for saving data
typedef struct thread_data
{
char str[MAX_BUF];
int result;
} thread_data;
// the
void *routine(void *arg)
{
int fd[2];
char *myfifo = "myfifo";
thread_data *tdata = (thread_data *)arg;
if (!(strcmp(tdata->str, "exit")))
tdata->result = 1; // is exit
else
tdata->result = 0; // not exit
if (tdata->result == 1)
{
fd[1] = open(myfifo, O_WRONLY);
write(fd[1], "Done", sizeof(MAX_BUF));
close(fd[1]);
}
else
{
char string[MAX_BUF] = {0};
char c = 0;
int length = 0, i = 0;
length = strlen(tdata->str);
printf("\nBefore Swap : %s\n", tdata->str);
for (i = 0; i < length / 2; i++)
{
c = tdata->str[i];
tdata->str[i] = tdata->str[length - 1 - i];
tdata->str[length - 1 - i] = c;
}
printf("\nAfter Swap String : %s\n", tdata->str);
fd[1] = open(myfifo, O_WRONLY);
write(fd[1], tdata->str, sizeof(MAX_BUF));
close(fd[1]);
}
pthread_exit(NULL);
}
int Calculation()
{
int fd[2];
// fd[0] read
// fd[1] write
char *myfifo = "myfifo";
char buf[MAX_BUF];
/* open, read, and display the message from the FIFO */
fd[0] = open(myfifo, O_RDONLY);
if(fd[0]==-1)
return 4;
if(read(fd[0], buf, MAX_BUF)==-1)
return 5;
close(fd[0]);
// res
int result;
thread_data tdata;
strcpy(tdata.str, buf);
pthread_t t1;
if (pthread_create(&t1, NULL, &routine, (void *)&tdata) != 0)
{
return 1;
}
if (pthread_join(t1, NULL) != 0)
{
return 2;
}
}
int main()
{
int res = Calculation();
return res;
}

Answer 1

To avoid closing a program you should capture and
manage the signal sent by CTRL + C, that is SIGINT, I have modified the code so that it captures the signal CTRL + C
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <time.h>
#define MAX_BUF 1024
// client
int main()
{
signal(SIGINT,SIG_IGN); // Register signal handler for ignoring the signal
int fd;
char *myfifo = "myfifo";
char str[MAX_BUF];
printf("Input string: ");
fgets(str, MAX_BUF, stdin);
str[strlen(str) - 1] = '\0';
if (mkfifo("myfifo", 0777) == -1)
{
if (errno != EEXIST)
{
printf("Could not create fifo file\n");
return 1;
}
}
/* create the FIFO (named pipe) */
fd = open(myfifo, O_WRONLY);
if (fd == -1)
return 2;
if (write(fd, str, MAX_BUF) == -1)
return 3;
close(fd);
fd = open(myfifo, O_RDONLY);
read(fd, str, MAX_BUF);
printf("%s\n", str);
/* remove the FIFO */
unlink(myfifo);
return 0;
}