still working in shm
This commit is contained in:
ItsMAX0112
parent
7fe01720af
commit
06c3b4e2ac
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@ -3,6 +3,8 @@
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"ostream": "cpp",
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"chrono": "cpp",
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"iostream": "cpp",
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"iosfwd": "cpp"
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"iosfwd": "cpp",
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"fstream": "cpp",
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"xlocmes": "cpp"
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}
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}
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@ -15,4 +15,4 @@ run-coms: ./coms.out
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clean:
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rm a.out coms.out
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.PHONY: run-coms
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.PHONY: run-coms clean
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@ -0,0 +1,260 @@
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#include "important.h"
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#include <iostream>
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#include <cstdint>
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#include <chrono>
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#include <fstream>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include<sys/mman.h>
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#include<sys/stat.h>
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#include<fcntl.h>
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using namespace std;
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int main(int argc, char *argv[]) {
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// if(argc != 3)
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// {
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// cout << "usage: ./a.out <path-to-original-image> <path-to-transformed-image>\n\n";
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// exit(0);
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// }
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// struct image_t *input_image = read_ppm_file(argv[1]);
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// struct image_t *smoothened_image = S1_smoothen(input_image);
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char buf;
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pid_t CHILD;
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CHILD = fork();
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if (CHILD == -1) {
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perror("fork failed!");
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exit(EXIT_FAILURE);
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}
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// Parent Process
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if(CHILD != 0){
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const char *name = "/parent-child";
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int shm_fd = shm_open(name, O_CREAT | O_RDWR, 0666);
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if (shm_fd == -1) {
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perror("shm_open");
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return 1;
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}
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// Set the size of the shared memory region
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// size_t size = smoothened_image->height * smoothened_image->width * 3;
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size_t size = 1024;
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// Resize the shared memory object to the desired size
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if (ftruncate(shm_fd, size) == -1) {
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perror("ftruncate");
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return 1;
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}
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// Map the shared memory object into the process address space
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void *ptr = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, shm_fd, 0);
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if (ptr == MAP_FAILED) {
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perror("mmap");
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return 1;
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}
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// Write data to the shared memory
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sprintf((char *)ptr, "...PACKET...");
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// Unmap the shared memory object
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if (munmap(ptr, size) == -1) {
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perror("munmap");
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return 1;
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}
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// Close the shared memory file descriptor
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if (close(shm_fd) == -1) {
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perror("close");
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return 1;
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}
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// Unlink the shared memory object
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// if (shm_unlink(name) == -1) {
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// perror("shm_unlink");
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// return 1;
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// }
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printf("parent writing to shm\n");
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wait(NULL); /* Wait for child */
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}
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// Child process
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else if (CHILD == 0) { /* Child reads from pipe */
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pid_t GRAND_CHILD = fork();
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if (GRAND_CHILD == -1) {
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perror("fork failed!");
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exit(EXIT_FAILURE);
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}
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// Child Process
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if(GRAND_CHILD != 0){
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// close(pipe1[1]); /* Close unused write end for s1_s2 pipe */
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// close(pipe2[0]); /* Close unused read end for s2_s3 pipe */
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// char to_print[] = "C : x\n";
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// while (read(pipe1[0], &buf, 1) > 0)
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// {
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// printf("child reading from pipe\n");
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// to_print[4] = buf;
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// write(STDOUT_FILENO, &to_print, strlen(to_print));
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// }
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printf("Child reading from shm...\n");
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const char *name = "/parent-child";
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int shm_fd = shm_open(name, O_CREAT | O_RDWR, 0666);
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if (shm_fd == -1) {
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perror("shm_open");
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return 1;
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}
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// Set the size of the shared memory region
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size_t size = 1024;
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// Resize the shared memory object to the desired size
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if (ftruncate(shm_fd, size) == -1) {
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perror("ftruncate");
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return 1;
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}
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// Map the shared memory object into the process address space
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void *ptr = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, shm_fd, 0);
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if (ptr == MAP_FAILED) {
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perror("mmap");
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return 1;
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}
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sleep(2);
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// Print the contents of the shared memory
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char *packet = (char *)ptr;
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printf("Shared memory contents: %s\n", packet);
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char buffer[1024];
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strncpy(buffer, packet, 1024);
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// Unmap the shared memory object
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if (munmap(ptr, size) == -1) {
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perror("munmap");
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return 1;
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}
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// Close the shared memory file descriptor
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if (close(shm_fd) == -1) {
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perror("close");
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return 1;
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}
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printf("child writing to shm\n");
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const char *name2 = "/child-grandchild";
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int shm2_fd = shm_open(name2, O_CREAT | O_RDWR, 0666);
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if (shm2_fd == -1) {
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perror("shm_open");
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return 1;
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}
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// Set the size of the shared memory region
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// size_t size = smoothened_image->height * smoothened_image->width * 3;
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// size_t size = 1024;
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// Resize the shared memory object to the desired size
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if (ftruncate(shm2_fd, size) == -1) {
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perror("ftruncate");
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return 1;
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}
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// Map the shared memory object into the process address space
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void *ptr2 = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, shm2_fd, 0);
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if (ptr2 == MAP_FAILED) {
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perror("mmap");
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return 1;
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}
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// Write data to the shared memory
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sprintf((char *)ptr2, buffer, 1024);
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// Unmap the shared memory object
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if (munmap(ptr2, size) == -1) {
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perror("munmap");
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return 1;
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}
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// Close the shared memory file descriptor
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if (close(shm2_fd) == -1) {
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perror("close");
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return 1;
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}
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wait(NULL);
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exit(EXIT_SUCCESS);
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}
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// GrandChild Process
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else if (GRAND_CHILD == 0) { /* GrandChild reads from pipe */
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printf("Grandchild reading from shm...\n");
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const char *name = "/child-grandchild";
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int shm_fd = shm_open(name, O_CREAT | O_RDWR, 0666);
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if (shm_fd == -1) {
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perror("shm_open");
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return 1;
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}
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// Set the size of the shared memory region
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size_t size = 1024;
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// Resize the shared memory object to the desired size
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if (ftruncate(shm_fd, size) == -1) {
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perror("ftruncate");
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return 1;
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}
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// Map the shared memory object into the process address space
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void *ptr = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, shm_fd, 0);
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if (ptr == MAP_FAILED) {
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perror("mmap");
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return 1;
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}
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sleep(2);
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// Print the contents of the shared memory
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printf("Shared memory contents: %s\n", (char *)ptr);
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// Unmap the shared memory object
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if (munmap(ptr, size) == -1) {
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perror("munmap");
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return 1;
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}
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// Close the shared memory file descriptor
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if (close(shm_fd) == -1) {
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perror("close");
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return 1;
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}
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exit(EXIT_SUCCESS);
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}
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}
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cout << "success" << endl;
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return 0;
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}
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@ -29,7 +29,7 @@ int main() {
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}
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// Write data to the shared memory
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sprintf(ptr, "Hello, shared memory!");
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sprintf((char *)ptr, "Hello, shared memory!");
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// Unmap the shared memory object
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if (munmap(ptr, size) == -1) {
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