forked from gtowne/CS552-ramdisk
/
ramdisk_lib.c
164 lines (109 loc) · 3.04 KB
/
ramdisk_lib.c
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/*
_____ ______ _
|_ _| | ___ \ | |
| | ___ __ _ _ __ ___ | |_/ /__ _ _ __ | |_ ___ _ __
| |/ _ \/ _` | '_ ` _ \ | // _` | '_ \| __|/ _ \| '__|
| | __/ (_| | | | | | | | |\ \ (_| | |_) | |_| (_) | |
\_/\___|\__,_|_| |_| |_| \_| \_\__,_| .__/ \__|\___/|_|
| |
|_|
Luis Carrasco, Diane Theriault, Gordon Towne
Ramdisk - Project 3 - CS552
ramdisk_lib.c
user level library to interface with RAM disk
*/
#include "ramdisk_lib.h"
int ioctl_fd;
/*
* @TODO: Pass back appropriate return values
*/
int rd_creat (char *pathname) {
struct pathname_args_t args;
if (!ioctl_fd)
ioctl_fd = open (PROC_ENTRY, O_RDONLY);
args.pathname = pathname;
args.str_len = strlen(pathname) + 1;
ioctl (ioctl_fd, RD_CREAT, &args);
return args.ret_val;
}
int rd_mkdir (char *pathname) {
struct pathname_args_t args;
if (!ioctl_fd)
ioctl_fd = open (PROC_ENTRY, O_RDONLY);
args.pathname = pathname;
args.str_len = strlen(pathname) + 1;
ioctl (ioctl_fd, RD_MKDIR, &args);
return args.ret_val;
}
int rd_open (char *pathname) {
struct pathname_args_t args;
if (!ioctl_fd)
ioctl_fd = open (PROC_ENTRY, O_RDONLY);
args.pathname = pathname;
args.str_len = strlen(pathname) + 1;
ioctl (ioctl_fd, RD_OPEN, &args);
return args.ret_val;
}
int rd_close (int fd) {
struct close_args_t args;
if (!ioctl_fd)
ioctl_fd = open (PROC_ENTRY, O_RDONLY);
args.fd = fd;
ioctl (ioctl_fd, RD_CLOSE, &args);
return args.ret_val;
}
int rd_read (int fd, char* address, int num_bytes) {
struct read_write_args_t args;
if (!ioctl_fd)
ioctl_fd = open (PROC_ENTRY, O_RDONLY);
args.fd = fd;
args.address = address;
args.num_bytes = num_bytes;
ioctl (ioctl_fd, RD_READ, &args);
return args.ret_val;
}
int rd_write (int fd, char* address, int num_bytes) {
struct read_write_args_t args;
if (!ioctl_fd)
ioctl_fd = open (PROC_ENTRY, O_RDONLY);
args.fd = fd;
args.address = address;
args.num_bytes = num_bytes;
ioctl (ioctl_fd, RD_WRITE, &args);
return args.ret_val;
}
int rd_seek (int fd, int offset) {
struct seek_args_t args;
if (!ioctl_fd)
ioctl_fd = open (PROC_ENTRY, O_RDONLY);
args.fd = fd;
args.offset = offset;
ioctl (ioctl_fd, RD_SEEK, &args);
return args.ret_val;
}
int rd_unlink (char *pathname) {
struct pathname_args_t args;
if (!ioctl_fd)
ioctl_fd = open (PROC_ENTRY, O_RDONLY);
args.pathname = pathname;
args.str_len = strlen(pathname) + 1;
ioctl (ioctl_fd, RD_UNLINK, &args);
return args.ret_val;
}
int rd_readdir (int fd, char *address) {
struct read_write_args_t args;
if (!ioctl_fd)
ioctl_fd = open (PROC_ENTRY, O_RDONLY);
args.fd = fd;
args.address = address;
ioctl (ioctl_fd, RD_READDIR, &args);
return args.ret_val;
}
int main() {
char a = 'a';
rd_read(3, &a, 12);
rd_close(10);
rd_write(5, &a, 10);
rd_seek(6, 14);
rd_readdir(12, &a);
}