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kernel: /dev/tty as a dynamic symlink to /dev/pts/n

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This commit is contained in:
K. Lange 2018-10-11 19:47:22 +09:00
parent 96d661f8c8
commit 373df32e7b
1 changed files with 59 additions and 0 deletions
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59
kernel/fs/tty.c
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@ -20,6 +20,7 @@
static int _pty_counter = 0;
static hashmap_t * _pty_index = NULL;
static fs_node_t * _pty_dir = NULL;
static fs_node_t * _dev_tty = NULL;
static void pty_write_in(pty_t * pty, uint8_t c) {
ring_buffer_write(pty->in, 1, &c);
@ -422,6 +423,62 @@ fs_node_t * pty_slave_create(pty_t * pty) {
return fnode;
}
static int isatty(fs_node_t * node) {
if (!node) return 0;
if (!node->ioctl) return 0;
return ioctl_fs(node, IOCTLDTYPE, NULL) == IOCTL_DTYPE_TTY;
}
static int readlink_dev_tty(fs_node_t * node, char * buf, size_t size) {
pty_t * pty = NULL;
for (unsigned int i = 0; i < ((current_process->fds->length < 3) ? current_process->fds->length : 3); ++i) {
if (isatty(current_process->fds->entries[i])) {
pty = (pty_t *)current_process->fds->entries[i]->device;
break;
}
}
char tmp[30];
size_t req;
if (!pty) {
sprintf(tmp, "/dev/null");
} else {
sprintf(tmp, "/dev/pts/%d", pty->name);
}
req = strlen(tmp) + 1;
if (size < req) {
memcpy(buf, tmp, size);
buf[size-1] = '\0';
return size-1;
}
if (size > req) size = req;
memcpy(buf, tmp, size);
return size-1;
}
static fs_node_t * create_dev_tty(void) {
fs_node_t * fnode = malloc(sizeof(fs_node_t));
memset(fnode, 0x00, sizeof(fs_node_t));
fnode->inode = 0;
strcpy(fnode->name, "tty");
fnode->mask = 0777;
fnode->uid = 0;
fnode->gid = 0;
fnode->flags = FS_FILE | FS_SYMLINK;
fnode->readlink = readlink_dev_tty;
fnode->length = 1;
fnode->nlink = 1;
fnode->ctime = now();
fnode->mtime = now();
fnode->atime = now();
return fnode;
}
static struct dirent * readdir_pty(fs_node_t *node, uint32_t index) {
if (index == 0) {
struct dirent * out = malloc(sizeof(struct dirent));
@ -511,8 +568,10 @@ static fs_node_t * create_pty_dir(void) {
void pty_install(void) {
_pty_index = hashmap_create_int(10);
_pty_dir = create_pty_dir();
_dev_tty = create_dev_tty();
vfs_mount("/dev/pts", _pty_dir);
vfs_mount("/dev/tty", _dev_tty);
}
pty_t * pty_new(struct winsize * size) {