/*
* Writes to a file.
*/
PUBLIC ssize_t sys_write(int fd, const void *buf, size_t n)
{
dev_t dev; /* Device number. */
struct file *f; /* File. */
struct inode *i; /* Inode. */
ssize_t count = 0; /* Bytes actually written. */
/* Invalid file descriptor. */
if ((fd < 0) || (fd >= OPEN_MAX) || ((f = curr_proc->ofiles[fd]) == NULL))
return (-EBADF);
/* File not opened for writing. */
if (ACCMODE(f->oflag) == O_RDONLY)
return (-EBADF);
/* Invalid buffer. */
if (!chkmem(buf, n, MAY_READ))
return (-EINVAL);
i = f->inode;
/* Append mode. */
if (f->oflag & O_APPEND)
f->pos = i->size;
/* Character special file. */
if (S_ISCHR(i->mode))
{
dev = i->blocks[0];
count = cdev_write(dev, buf, n);
return (count);
}
/* Block special file. */
else if (S_ISBLK(i->mode))
{
dev = i->blocks[0];
count = bdev_write(dev, buf, n, f->pos);
}
/* Pipe file. */
else if (S_ISFIFO(i->mode))
{
kprintf("write to pipe");
count = pipe_write(i, buf, n);
}
/* Regular file. */
else if (S_ISREG(i->mode))
count = file_write(i, buf, n, f->pos);
/* Failed to write. */
if (count < 0)
return (curr_proc->errno);
f->pos += count;
return (count);
}
int
ptyfs_write(void *v)
{
struct vop_write_args /* {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
kauth_cred_t a_cred;
} */ *ap = v;
struct timespec ts;
struct vnode *vp = ap->a_vp;
struct ptyfsnode *ptyfs = VTOPTYFS(vp);
int error;
ptyfs->ptyfs_flag |= PTYFS_MODIFY;
getnanotime(&ts);
(void)ptyfs_update(vp, &ts, &ts, 0);
switch (ptyfs->ptyfs_type) {
case PTYFSpts:
case PTYFSptc:
VOP_UNLOCK(vp, 0);
error = cdev_write(vp->v_rdev, ap->a_uio, ap->a_ioflag);
vn_lock(vp, LK_RETRY|LK_EXCLUSIVE);
return error;
default:
return EOPNOTSUPP;
}
}
/* ARGSUSED */
static int
cnwrite(dev_t dev, struct uio *uio, struct cred *cred)
{
if (rconsvp == NULL) {
uio->uio_resid = 0;
return (0);
}
/*
* Output to virtual console for logging if enabled.
*/
if (vsconsvp != NULL && vsconsvp->v_stream != NULL) {
struiod_t uiod;
/*
* strwrite modifies uio so need to make copy.
*/
(void) uiodup(uio, &uiod.d_uio, uiod.d_iov,
sizeof (uiod.d_iov) / sizeof (*uiod.d_iov));
(void) strwrite(vsconsvp, &uiod.d_uio, cred);
}
if (rconsvp->v_stream != NULL)
return (strwrite(rconsvp, uio, cred));
else
return (cdev_write(rconsdev, uio, cred));
}
/**
* @brief Writes a message to the kernel's output device and panics the kernel.
*
* @param fmt Formatted message to be written onto kernel's output device.
*/
PUBLIC void kpanic(const char *fmt, ...)
{
int i; /* Loop index. */
va_list args; /* Variable arguments list. */
char buffer[KBUFFER_SIZE + 1]; /* Temporary buffer. */
kstrncpy(buffer, "PANIC: ", 7);
/* Convert to raw string. */
va_start(args, fmt);
i = kvsprintf(buffer + 7, fmt, args) + 7;
buffer[i++] = '\n';
va_end(args);
/* Save on kernel log and write on kout. */
cdev_write(kout, buffer, i);
klog_write(buffer, i);
/*
* Disable interrupts, so we cannot
* be bothered.
*/
disable_interrupts();
while(1);
halt();
}
int
cnwrite(dev_t dev, struct uio *uio, int flag)
{
int error;
/* Redirect output, if that's appropriate. */
if (!cn_redirect(&dev, 0, &error))
return error;
return cdev_write(dev, uio, flag);
}
/**
* @brief Changes kernel's output device.
*
* @param dev New output device.
*/
PUBLIC void chkout(dev_t dev)
{
ssize_t n; /* Number of bytes to be flushed. */
char buffer[KBUFFER_SIZE]; /* Temporary buffer. */
kout = dev;
/* Flush the content of kernel log. */
n = klog_read(0, buffer, KLOG_SIZE);
cdev_write(kout, buffer, n);
}
DRESULT disk_write(FATFS *fat, const BYTE *buf, DWORD sector, BYTE count)
{
struct fat_priv *priv = fat->userdata;
int ret;
debug("%s: buf: %p sector: %ld count: %d\n",
__func__, buf, sector, count);
ret = cdev_write(priv->cdev, buf, count << 9, (loff_t)sector * 512, 0);
if (ret != count << 9)
return ret;
return 0;
}
/**
* @brief Writes on the screen a formated string.
*
* @param fmt Formated string.
*/
PUBLIC void kprintf(const char *fmt, ...)
{
int i; /* Loop index. */
va_list args; /* Variable arguments list. */
char buffer[KBUFFER_SIZE + 1]; /* Temporary buffer. */
const char *buffer_no_code; /* Temporary buffer for log level printing. */
/* Convert to raw string. */
va_start(args, fmt);
i = kvsprintf(buffer, fmt, args);
buffer[i++] = '\n';
va_end(args);
/* Save on kernel log, skip code in case it's not correctly done and write on kout. */
klog_write(0, buffer, i);
buffer_no_code = skip_code(buffer, &i);
cdev_write(kout, buffer_no_code, i);
}