You have two sample files attached to this assignment: one showing how to work with memory sharing and another showing implementing a copy program using open(), read(), and write() methods. Your job here is to convert the copy program to copy one file to another file(with a different name) using memory mapping APIs, not using read() methods. You can use write API.Copy.c#define NULL 0#define BUFFSIZE 512#define PMODE 0644 /* RW for owner, R for group, others */main ( int argc, char *argv[]){ int f1, f2, f3; char buf[BUFFSIZE]; if(argc != 3) error("Usage: copy from to", NULL); if(( f1 = open(argv[1], 0)) == -1) error("copy can't open %s", argv[1]); if(( f2 = create(argv[2], PMODE)) == -1) error("copy: can't create %s", argv[2]); while (( f3 = read(f1, buf, BUFFSIZE)) >0) if(write (f2, buf, n) != n) error("copy: write error", NULL); exit(0); } void error( char *s1, char *s2){ printf(s1, s2); printf("\n"); exit(1); }MappingSample.c#include <stdio.h>#include <sys/types.h>#include <sys/stat.h>#include <fcntl.h>#include <unistd.h>#include <sys/mman.h>int main(int argc, char *argv[]){ struct stat sb; off_t len; char *p; int fd; if(argc < 2){ fprintf(stderr, "usage: %s <file>\n", argv[0]); return 1; } fd = open(argv[1], O_RDONLY); if(fd == -1){ perror("open"); return 1; } if(fstat(fd, &sb) == -1){ perror("fstat"); return 1; } if(!S_ISREG(sb.st_mode)){ fprintf(stderr, "%s is not a file\n", argv[1]); return 1; } p = mmap(0, sb.st_size, PROT_READ, MAP_SHARED, fd, 0); if(p == MAP_FAILED){ perror("mmap"); return 1; } for(len = 0; len < sb.st_size; len++){ putchar(p[len]); } if(munmap(p, sb.st_size) == -1) { perror("munmap"); return 1; } if(close(fd) == -1) { perror("close"); return 1; } return 0; }

Hello attached are discussion questions that only need to be at least 300 words each.