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***********************cp***************************** #include stdio.h #include unistd.h #include fcntl.h #include stdlib.h #include sys/stat.h #include time.h #include sys/types.h #include utime.h #define BUFFERSIZE 4096 #define COPYMODE 0644 void oops(char *, char *); int syn(char *, char *); main(int ac, char *av[]){ int in_fd, out_fd, n_chars; char buf[BUFFERSIZE]; /* check args */ if ( ac != 3 ){ fprintf( stderr, usage: %s source destination\n, *av); exit(1); } /* open files */ if ( (in_fd=open(av[1], O_RDONLY)) == -1 ) oops(Cannot open , av[1]); if ( (out_fd=creat( av[2], COPYMODE)) == -1 ) oops( Cannot creat, av[2]); /* copy files */ while ( (n_chars = read(in_fd , buf, BUFFERSIZE)) 0 ) if ( write( out_fd, buf, n_chars ) != n_chars ) oops(Write error to , av[2]); if ( n_chars == -1 ) oops(Read error from , av[1]); syn(av[1],av[2]); /* close files */ if ( close(in_fd) == -1 || close(out_fd) == -1 ) oops(Error closing files,); } void oops(char *s1, char *s2){ fprintf(stderr,Error: %s , s1); perror(s2); exit(1); } int syn(char *sfile, char *dfile){ struct stat sbuff; struct utimbuf dbuff; if( (stat(sfile,sbuff) == 0)){ dbuff.actime = sbuff.st_atime ; dbuff.modtime = sbuff.st_mtime ; printf(success%s\n,ctime(dbuff.actime)); if( utime(dfile, dbuff) == 0){ printf(success\n); return 1; } } return 0; } ***********************fork****************** #include sys/types.h #include unistd.h #include stdio.h #includestdlib.h #define MAXLINE 80 int main( ){ int p1,p2; int n; int fd[2]; pid_t pid; char line[M