/*---------------------------------------------------------------------------*/
int __fastcall__
pfs_opendir(struct cfs_dir *dirp, register const char *name)
{
static int fd;
static char buf[2 + 1] = "$";
/* Set up the actual file name that is sent to the DOS.
** We accept "0:", "1:", "/", and "." as directory names.
*/
if(name == NULL || name[0] == '\0' || (name[0] == '.' || name[0] == '/') && name[1] == '\0') {
buf[1] = '\0';
} else if((name[0] == '0' || name[0] == '1') && name[1] == ':' && name[2] == '\0') {
buf[1] = name[0];
buf[2] = '\0';
} else {
return -1;
}
/* Open the directory on a disk, for reading. */
fd = pfs_open(buf, CFS_READ);
if(fd >= 0) {
((DIR *)dirp)->fd = fd;
/* Skip the load address. */
if(_pfs_dirread(dirp, buf + 1, 2)) {
return 0;
} else {
pfs_close(fd);
}
}
return -1;
}
int main(int argc, char *argv[])
{
int ifdes, fdes;
int err_value;
char input_fname[20];
char *buf;
ssize_t nread;
struct pfs_stat mystat;
int cache_hit;
// Initialize the client
initialize(argc, argv);
// the command line arguments include an input filename
if (argc < 2)
{
printf("usage: a.out <input filename>\n");
exit(0);
}
strcpy(input_fname, argv[1]);
ifdes = open(input_fname, O_RDONLY);
buf = (char *)malloc(4*ONEKB);
nread = pread(ifdes, (void *)buf, 3*ONEKB,8*ONEKB);
// All the clients open the pfs file
fdes = pfs_open("pfs_file1", 'w');
if(fdes < 0)
{
printf("Error opening file\n");
exit(0);
}
//At client 3: print the file metadata
pfs_fstat(fdes, &mystat);
printf("File Metadata:\n");
printf("Time of creation: %s\n", ctime(&(mystat.pst_ctime)));
printf("Time of last modification: %s\n", ctime(&(mystat.pst_mtime)));
printf("File Size: %d\n", mystat.pst_size);
//Write the next 3 kbytes of data from the input file onto pfs_file
err_value = pfs_write(fdes, (void *)buf, 3*ONEKB, 8*ONEKB, &cache_hit);
printf("Wrote %d bytes to the file\n", err_value);
err_value = pfs_read(fdes, (void *)buf, 2*ONEKB, ONEKB, &cache_hit);
printf("Read %d bytes of data from the file\n", err_value);
printf("%s\n",buf);
pfs_close(fdes);
pfs_delete("pfs_file1");
free(buf);
close(ifdes);
return 0;
}
int main(int argc, char *argv[])
{
int fdes;
int num_misses=0;
off_t myoff = 0;
char *buf;
int cache_hit, go_on=1;
struct pfs_stat mystat;
ssize_t nread;
int file_size;
// Open the file in the write mode
fdes = pfs_open("file", 'w');
if(fdes < 0)
{
printf("Error opening file\n");
exit(0);
}
pfs_fstat(fdes, &mystat);
file_size = mystat.pst_size;
buf = (char*)malloc(200*ONEKB);
while(go_on)
{
nread = pfs_read(fdes, (void *)buf, 100*ONEKB, myoff%, &cache_hit);
if(!cahce_hit)
num_misses++;
printf("Read %d bytes from the file\n", nread);
printf("Number of cache misses = %d\n", num_misses);
if ( (myoff+(100*ONEKB)) > file_size)
myoff=0;
else
myoff+=(100*ONEKB);
printf("Read again? (1 or 0):");
scanf("%d", &go_on);
}
free(buf);
pfs_close(fdes);
}
int main2(int argc, char *argv[])
{
argc=2;argv[1]="1";
initialize(argc,argv);
int fdes;
int err_value;
off_t myoff;
char *buf;
int cache_hit, go_on;
ssize_t nread;
// Open the file in the write mode
fdes = pfs_open("pfs_file1", "w");
if(fdes < 0)
{
printf("Error opening file\n");
exit(0);
}
//Do overlapping writes onto the same pfs_file from multiple clients
buf = (char*)malloc(ONEKB);
while(go_on)
{
printf("Enter text to be written to the file\ntext>");
scanf("%[^\n]s", buf);
printf("Enter the offset:");
scanf("%d", &myoff);
err_value = pfs_write(fdes, (void *)buf, strlen(buf), myoff, &cache_hit);
printf("Wrote %d bytes to the file\n", err_value);
printf("Enter more text? (1 or 0):");
scanf("%d", &go_on);
}
free(buf);
pfs_close(fdes);
}
