Below is the cp1.c program:

#include #include #include #define BUFFERSIZE 4096 #define COPYMODE 0644 void oops(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 ", *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]); /* 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); }

What does the standard cp do if you try to copy a file onto itself? For example: cp file1 file1 What do you think is the correct action? Modify cp1.c to handle that situation