write.c

#include <time.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <fcntl.h>

int main(int argc, char *argv[]) {
    srand(time(NULL));
    char memn[] = "client.c"; //  имя объекта
    char *addr;
    int shm;
    int mem_size = 100; //размер области
    int buff[50];
    //открыть объект
    if ((shm = shm_open(memn, O_RDWR, 0666)) == -1 ) {
        printf("Opening error\n");
        perror("shm_open");
        return 1;
    } else {
        printf("Object is open: name = %s, id = 0x%x\n", memn, shm);
    }
    addr = mmap(0, mem_size, PROT_WRITE|PROT_READ, MAP_SHARED, shm, 0);
    if (addr == (char*)-1 ) {
        printf("Error getting pointer to shared memory\n");
        return 1;
    }
    for (int i = 0; i < 50; ++i) {
        buff[i] = rand() % 1001;
    }
    memcpy(addr, buff, 50 * sizeof(int));
    close(shm);
    return 0;
}