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socketProducer.c
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socketProducer.c
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#define _GNU_SOURCE
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <unistd.h>
#include <stdlib.h>
#include <signal.h>
#include <semaphore.h>
#include <time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#define MAX_WRITE_SIZE 65535 //max tcp data length
//socket file descriptor
int fd_socket;
//new socket connection file descriptor
int fd_socket_new;
//port number
int portno;
//server and client addresses
struct sockaddr_in server_addr, client_addr;
//variables for time measurement
struct timeval start_time, stop_time;
//flag if the consumer received all the data
int flag_transfer_complete = 0;
//amount of transfer milliseconds
int transfer_time;
//buffer size
int size;
//memory mode
int mode;
//pointer to log file
FILE *logfile;
//This function checks if something failed, exits the program and prints an error in the logfile
int check(int retval)
{
if (retval == -1)
{
fprintf(logfile, "\nProducer - ERROR (" __FILE__ ":%d) -- %s\n", __LINE__, strerror(errno));
fflush(logfile);
fclose(logfile);
printf("\tAn error has been reported on log file.\n");
fflush(stdout);
exit(-1);
}
return retval;
}
void random_string_generator(char buffer[])
{
for (int i = 0; i < size; i++)
{
int char_index = 32 + rand() % 94;
buffer[i] = char_index;
}
//write on log file
fprintf(logfile, "p - random string generated\n");
fflush(logfile);
}
void transfer_complete(int sig)
{
if (sig == SIGUSR1)
{
//write on log file
fprintf(logfile, "p - received signal!\n");
fflush(logfile);
check(gettimeofday(&stop_time, NULL));
//calculating time in milliseconds
transfer_time = 1000 * (stop_time.tv_sec - start_time.tv_sec) + (stop_time.tv_usec - start_time.tv_usec) / 1000;
flag_transfer_complete = 1;
}
}
void send_array(char buffer[])
{
//number of cycles needed to send all the data
int cycles = size / MAX_WRITE_SIZE + (size % MAX_WRITE_SIZE != 0 ? 1 : 0);
//write on log file
fprintf(logfile, "p - starting sending array...\n");
fprintf(logfile, "p - there will be %d cycles\n", cycles);
fflush(logfile);
//sending data to consumer divided into blocks of dimension max_write_size
for (int i = 0; i < cycles; i++)
{
char segment[MAX_WRITE_SIZE];
for (int j = 0; j < MAX_WRITE_SIZE && ((i * MAX_WRITE_SIZE + j) < size); j++)
{
segment[j] = buffer[i * MAX_WRITE_SIZE + j];
}
check(write(fd_socket_new, segment, MAX_WRITE_SIZE));
}
//write on log file
fprintf(logfile, "p - array sent!\n");
fflush(logfile);
}
int main(int argc, char *argv[])
{
//open log file in write mode
logfile = fopen("socket_log.txt", "a");
if (logfile == NULL)
{
printf("an error occured while creating sockets's log File\n");
return 0;
}
fprintf(logfile, "******log file created******\n");
fflush(logfile);
//getting size from console
if (argc < 2)
{
fprintf(stderr, "Producer - ERROR, no size provided\n");
exit(0);
}
size = atoi(argv[1]) * 1000000;
//getting mode from console
if (argc < 3)
{
fprintf(stderr, "Producer - ERROR, no mode provided\n");
exit(0);
}
mode = atoi(argv[2]);
//getting port number
if (argc < 4)
{
fprintf(stderr, "Producer - ERROR, no port provided\n");
exit(0);
}
portno = atoi(argv[3]);
//randomizing seed for random string generator
srand(time(NULL));
//the process must handle SIGUSR1 signal
signal(SIGUSR1, transfer_complete);
//create socket
fd_socket = socket(AF_INET, SOCK_STREAM, 0);
if (fd_socket < 0)
{
check(-1);
}
//write on log file
fprintf(logfile, "p - socket created\n");
fflush(logfile);
//set server address for connection
bzero((char *)&server_addr, sizeof(server_addr));
server_addr.sin_family = AF_INET;
server_addr.sin_addr.s_addr = INADDR_ANY;
server_addr.sin_port = htons(portno);
//bind socket
if (check(bind(fd_socket, (struct sockaddr *)&server_addr,
sizeof(server_addr))) < 0)
{
check(-1);
}
//write on log file
fprintf(logfile, "p - socket bound\n");
fflush(logfile);
//wait for connections
check(listen(fd_socket, 5));
//enstablish connection
int client_length = sizeof(client_addr);
fd_socket_new = check(accept(fd_socket, (struct sockaddr *)&client_addr, &client_length));
if (fd_socket_new < 0)
{
check(-1);
}
//write on log file
fprintf(logfile, "c - connection accepted\n");
fflush(logfile);
//sending pid to consumer
pid_t pid = getpid();
check(write(fd_socket_new, &pid, sizeof(pid)));
//write on log file
fprintf(logfile, "p - pid %d sent\n", pid);
fflush(logfile);
//switch between dynamic allocation or standard allocation
if (mode == 0)
{
//dynamic allocation of buffer
char *buffer = (char *)malloc(size);
//generating random string
random_string_generator(buffer);
//get time of when the transfer has started
check(gettimeofday(&start_time, NULL));
//writing buffer on pipe
send_array(buffer);
//delete buffer from memory
free(buffer);
}
else
{
//increasing stack limit to let the buffer be instantieted correctly
struct rlimit limit;
limit.rlim_cur = (size + 5) * 1000000;
limit.rlim_max = (size + 5) * 1000000;
check(setrlimit(RLIMIT_STACK, &limit));
char buffer[size];
//generating random string
random_string_generator(buffer);
//get time of when the transfer has started
check(gettimeofday(&start_time, NULL));
//writing buffer on pipe
send_array(buffer);
}
//wait until transfer is complete
while (flag_transfer_complete == 0)
{
;
}
printf("\tsocket time: %d ms\n", transfer_time);
fflush(stdout);
//write on log file
fprintf(logfile, "time: %d ms\n", transfer_time);
fflush(logfile);
//close socket
check(close(fd_socket));
check(close(fd_socket_new));
//write on log file
fprintf(logfile, "p - socket closed\n");
fflush(logfile);
//close log file
fclose(logfile);
return 0;
}