Cosmetics, cosmetics and cosmetics.
This commit is contained in:
Godzil
parent
0678a66b3c
commit
fd1f2a7374
@ -104,7 +104,8 @@ void fusd_init()
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{
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static int fusd_init_needed = 1;
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if (fusd_init_needed) {
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if (fusd_init_needed)
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{
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int i;
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fusd_init_needed = 0;
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@ -128,7 +129,8 @@ int fusd_register(const char *name, const char* clazz, const char* devname, mode
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fusd_init();
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/* make sure the name is valid and we have a valid set of fops... */
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if (name == NULL || fops == NULL) {
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if (name == NULL || fops == NULL)
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{
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fprintf(stderr, "fusd_register: invalid name or fops argument\n");
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retval = -EINVAL;
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goto done;
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@ -139,27 +141,33 @@ int fusd_register(const char *name, const char* clazz, const char* devname, mode
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* to register are SKIP_PREFIX (usually "/dev/"), skip over them.
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*/
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if (dev_root != NULL && strlen(name) > strlen(dev_root) &&
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!strncmp(name, dev_root, strlen(dev_root))) {
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!strncmp(name, dev_root, strlen(dev_root)))
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{
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name += strlen(dev_root);
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}
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if (strlen(name) > FUSD_MAX_NAME_LENGTH) {
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fprintf(stderr, "name '%s' too long, sorry :(", name);
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if (strlen(name) > FUSD_MAX_NAME_LENGTH)
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{
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fprintf(stderr, "libfusd: name '%s' too long, sorry :(\n", name);
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retval = -EINVAL;
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goto done;
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}
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/* open the fusd control channel */
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if ((fd = open(FUSD_CONTROL_DEVNAME, O_RDWR | O_NONBLOCK)) < 0) {
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if ((fd = open(FUSD_CONTROL_DEVNAME, O_RDWR | O_NONBLOCK)) < 0)
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{
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/* if the problem is that /dev/fusd does not exist, return the
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* message "Package not installed", which is hopefully more
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* illuminating than "no such file or directory" */
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if (errno == ENOENT) {
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if (errno == ENOENT)
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{
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fprintf(stderr, "libfusd: %s does not exist; ensure FUSD's kernel module is installed\n",
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FUSD_CONTROL_DEVNAME);
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retval = -ENOPKG;
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} else {
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}
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else
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{
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perror("libfusd: trying to open FUSD control channel");
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retval = -errno;
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}
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@ -167,7 +175,8 @@ int fusd_register(const char *name, const char* clazz, const char* devname, mode
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}
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/* fd in use? */
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if (FUSD_FD_VALID(fd)) {
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if (FUSD_FD_VALID(fd))
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{
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retval = -EBADF;
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goto done;
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}
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@ -184,7 +193,8 @@ int fusd_register(const char *name, const char* clazz, const char* devname, mode
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message.parm.register_msg.device_info = device_info;
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/* make the request */
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if (write(fd, &message, sizeof(fusd_msg_t)) < 0) {
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if (write(fd, &message, sizeof(fusd_msg_t)) < 0)
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{
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retval = -errno;
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goto done;
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}
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@ -195,34 +205,38 @@ int fusd_register(const char *name, const char* clazz, const char* devname, mode
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/* success! */
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done:
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if (retval < 0) {
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if (retval < 0)
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{
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if (fd >= 0)
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close(fd);
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errno = -retval;
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retval = -1;
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} else {
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}
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else
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{
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errno = 0;
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retval = fd;
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}
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return retval;
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}
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int fusd_unregister(int fd)
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{
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if (FUSD_FD_VALID(fd)) {
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int ret = -1;
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if (FUSD_FD_VALID(fd))
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{
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/* clear fd location */
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FUSD_SET_FOPS(fd, &null_fops);
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FD_CLR(fd, &fusd_fds);
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/* close */
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return close(fd);
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ret = close(fd);
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}
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else
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{
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errno = EBADF;
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}
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else {
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errno = EBADF;
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return -1;
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}
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return ret;
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}
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@ -241,21 +255,25 @@ void fusd_run(void)
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int i;
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/* locate maxmimum fd in use */
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for (maxfd=0, i=0; i < FD_SETSIZE; i++) {
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if (FD_ISSET(i, &fusd_fds)) {
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for (maxfd=0, i=0; i < FD_SETSIZE; i++)
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{
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if (FD_ISSET(i, &fusd_fds))
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{
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maxfd = i;
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}
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}
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maxfd++;
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while (1) {
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while (1)
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{
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/* select */
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memmove(&tfds, &fusd_fds, sizeof(fd_set));
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status = select(maxfd, &tfds, NULL, NULL, NULL);
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/* error? */
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if (status < 0) {
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if (status < 0)
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{
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perror("libfusd: fusd_run: error on select");
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continue;
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}
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@ -263,14 +281,13 @@ void fusd_run(void)
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/* readable? */
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for (i = 0; i < maxfd; i++)
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if (FD_ISSET(i, &tfds))
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fusd_dispatch(i);
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}
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}
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/************************************************************************/
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/* reads a fusd kernel-to-userspace message from fd, and puts a
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* fusd_msg into the memory pointed to by msg (we assume we are passed
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* a buffer managed by the caller). if there is a data portion to the
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@ -279,39 +296,51 @@ void fusd_run(void)
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* managed by the caller. */
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static int fusd_get_message(int fd, fusd_msg_t *msg)
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{
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int ret;
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/* read the header part into the kernel */
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if (read(fd, msg, sizeof(fusd_msg_t)) < 0) {
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if (read(fd, msg, sizeof(fusd_msg_t)) < 0)
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{
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if (errno != EAGAIN)
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perror("error talking to FUSD control channel on header read");
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return -errno;
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ret = -errno;
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goto exit;
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}
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msg->data = NULL; /* pointers in kernelspace have no meaning */
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if (msg->magic != FUSD_MSG_MAGIC) {
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fprintf(stderr, "libfusd magic number failure\n");
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return -EINVAL;
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if (msg->magic != FUSD_MSG_MAGIC)
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{
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fprintf(stderr, "libfusd: magic number failure\n");
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ret = -EINVAL;
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goto exit;
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}
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/* if there's a data part to the message, read it from the kernel. */
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if (msg->datalen) {
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if ((msg->data = malloc(msg->datalen + 1)) == NULL) {
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if (msg->datalen)
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{
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if ((msg->data = malloc(msg->datalen + 1)) == NULL)
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{
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fprintf(stderr, "libfusd: can't allocate memory\n");
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return -ENOMEM; /* this is bad, we are now unsynced */
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ret = -ENOMEM; /* this is bad, we are now unsynced */
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goto exit;
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}
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if (read(fd, msg->data, msg->datalen) < 0) {
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if (read(fd, msg->data, msg->datalen) < 0)
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{
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perror("error talking to FUSD control channel on data read");
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free(msg->data);
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msg->data = NULL;
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return -EIO;
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ret = -EIO;
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goto exit;
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}
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/* For convenience, we now ensure that the byte *after* the buffer
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* is set to 0. (Note we malloc'd one extra byte above.) */
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msg->data[msg->datalen] = '\0';
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}
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return 0;
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ret = 0;
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exit:
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return ret;
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}
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@ -323,10 +352,13 @@ void fusd_fdset_add(fd_set *set, int *max)
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{
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int i;
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for (i = 0; i < FD_SETSIZE; i++) {
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if (FD_ISSET(i, &fusd_fds)) {
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for (i = 0; i < FD_SETSIZE; i++)
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{
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if (FD_ISSET(i, &fusd_fds))
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{
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FD_SET(i, set);
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if (i > *max) {
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if (i > *max)
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{
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*max = i;
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}
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}
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@ -345,6 +377,7 @@ void fusd_dispatch_fdset(fd_set *set)
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for (i = 0; i < FD_SETSIZE; i++)
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if (FD_ISSET(i, set) && FD_ISSET(i, &fusd_fds))
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fusd_dispatch(i);
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}
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@ -366,14 +399,16 @@ static int fusd_dispatch_one(int fd, fusd_file_operations_t *fops)
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int user_retval = 0; /* returned to the user who made the syscall */
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/* check for valid, look up ops */
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if (fops == NULL) {
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if (fops == NULL)
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{
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fprintf(stderr, "fusd_dispatch: no fops provided!\n");
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driver_retval = -EBADF;
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goto out_noreply;
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}
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/* allocate memory for fusd_msg_t */
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if ((msg = malloc(sizeof(fusd_msg_t))) == NULL) {
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if ((msg = malloc(sizeof(fusd_msg_t))) == NULL)
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{
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driver_retval = -ENOMEM;
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fprintf(stderr, "libfusd: can't allocate memory\n");
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goto out_noreply;
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@ -386,7 +421,8 @@ static int fusd_dispatch_one(int fd, fusd_file_operations_t *fops)
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/* allocate file info struct */
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file = malloc(sizeof(fusd_file_info_t));
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if (NULL == file) {
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if (NULL == file)
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{
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fprintf(stderr, "libfusd: can't allocate memory\n");
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driver_retval = -ENOMEM;
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goto out_noreply;
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@ -412,7 +448,8 @@ static int fusd_dispatch_one(int fd, fusd_file_operations_t *fops)
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/* right now we only handle fops requests */
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if (msg->cmd != FUSD_FOPS_CALL && msg->cmd != FUSD_FOPS_NONBLOCK &&
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msg->cmd != FUSD_FOPS_CALL_DROPREPLY) {
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msg->cmd != FUSD_FOPS_CALL_DROPREPLY)
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{
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fprintf(stderr, "libfusd: got unknown msg->cmd from kernel\n");
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user_retval = -EINVAL;
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goto send_reply;
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@ -422,37 +459,47 @@ static int fusd_dispatch_one(int fd, fusd_file_operations_t *fops)
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user_retval = -ENOSYS;
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//printf("dispatch_one: subcmd: %d - ", msg->subcmd);
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switch (msg->subcmd) {
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switch (msg->subcmd)
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{
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case FUSD_OPEN:
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//printf("FUSD_OPEN\n");
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if (fops && fops->open)
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user_retval = fops->open(file);
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break;
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case FUSD_CLOSE:
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//printf("FUSD_CLOSE\n");
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if (fops && fops->close)
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user_retval = fops->close(file);
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break;
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case FUSD_READ:
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//printf("FUSD_READ\n");
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/* allocate a buffer and make the call */
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if (fops && fops->read) {
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if ((msg->data = malloc(msg->parm.fops_msg.length)) == NULL) {
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if (fops && fops->read)
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{
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if ((msg->data = malloc(msg->parm.fops_msg.length)) == NULL)
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{
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user_retval = -ENOMEM;
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fprintf(stderr, "libfusd: can't allocate memory\n");
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} else {
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}
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else
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{
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msg->datalen = msg->parm.fops_msg.length;
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user_retval = fops->read(file, msg->data, msg->datalen,
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&msg->parm.fops_msg.offset);
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}
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}
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break;
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case FUSD_WRITE:
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//printf("FUSD_WRITE\n");
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if (fops && fops->write)
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user_retval = fops->write(file, msg->data, msg->datalen,
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&msg->parm.fops_msg.offset);
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break;
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case FUSD_MMAP:
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//printf("FUSD_MMAP\n");
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if (fops && fops->mmap)
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@ -461,16 +508,20 @@ static int fusd_dispatch_one(int fd, fusd_file_operations_t *fops)
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&msg->parm.fops_msg.arg.ptr_arg, &msg->parm.fops_msg.length);
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}
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break;
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case FUSD_IOCTL:
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//printf("FUSD_IOCTL\n");
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if (fops && fops->ioctl) {
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if (fops && fops->ioctl)
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{
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/* in the case of an ioctl read, allocate a buffer for the
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* driver to write to, IF there isn't already a buffer. (there
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* might already be a buffer if this is a read+write) */
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if ((_IOC_DIR(msg->parm.fops_msg.cmd) & _IOC_READ) &&
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msg->data == NULL) {
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msg->data == NULL)
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{
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msg->datalen = _IOC_SIZE(msg->parm.fops_msg.cmd);
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if ((msg->data = malloc(msg->datalen)) == NULL) {
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if ((msg->data = malloc(msg->datalen)) == NULL)
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{
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user_retval = -ENOMEM;
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break;
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}
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@ -508,7 +559,7 @@ static int fusd_dispatch_one(int fd, fusd_file_operations_t *fops)
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/* out_noreply is only used for handling errors */
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out_noreply:
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out_noreply:
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if (msg->data != NULL)
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free(msg->data);
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if (msg != NULL)
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@ -516,21 +567,26 @@ static int fusd_dispatch_one(int fd, fusd_file_operations_t *fops)
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goto done;
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/* send_reply is only used for success */
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send_reply:
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if (-user_retval <= 0xff) {
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send_reply:
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if (-user_retval <= 0xff)
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{
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/* 0xff is the maximum legal return value (?) - return val to user */
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driver_retval = fusd_return(file, user_retval);
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} else {
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}
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else
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{
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/* if we got a FUSD_NOREPLY, don't free the msg structure */
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driver_retval = 0;
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}
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/* this is common to both errors and success */
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done:
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if (driver_retval < 0) {
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done:
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if (driver_retval < 0)
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{
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errno = -driver_retval;
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driver_retval = -1;
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}
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return driver_retval;
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}
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@ -550,7 +606,8 @@ void fusd_dispatch(int fd)
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fusd_file_operations_t *fops = NULL;
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/* make sure we have a valid FD, and get its fops structure */
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if (!FUSD_FD_VALID(fd)) {
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if (!FUSD_FD_VALID(fd))
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{
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errno = EBADF;
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retval = -1;
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fprintf(stderr, "libfusd: not a valid FUSD FD\n");
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@ -559,7 +616,8 @@ void fusd_dispatch(int fd)
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fops = FUSD_GET_FOPS(fd);
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/* now keep dispatching until a dispatch returns an error */
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do {
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do
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{
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retval = fusd_dispatch_one(fd, fops);
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if (retval >= 0)
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@ -569,14 +627,16 @@ void fusd_dispatch(int fd)
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/* if we've dispatched at least one message successfully, and then
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* stopped because of EAGAIN - do not report an error. this is the
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* common case. */
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if (num_dispatches > 0 && errno == EAGAIN) {
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if (num_dispatches > 0 && errno == EAGAIN)
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{
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retval = 0;
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errno = 0;
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}
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out:
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if (retval < 0 && errno != EPIPE)
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fprintf(stderr, "libfusd: fusd_dispatch error on fd %d: [%d] %m \n", fd, retval);
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fprintf(stderr, "libfusd: fusd_dispatch error on fd %d: [%d] %m\n", fd, retval);
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}
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@ -612,6 +672,7 @@ int fusd_return(fusd_file_info_t *file, ssize_t retval)
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fusd_msg_t *msg = NULL;
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int fd;
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int driver_retval = 0;
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int ret;
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struct iovec iov[2];
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if (file == NULL)
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@ -643,24 +704,29 @@ int fusd_return(fusd_file_info_t *file, ssize_t retval)
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goto free_memory;
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/* do we copy data back to kernel? how much? */
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switch(msg->subcmd) {
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switch(msg->subcmd)
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{
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case FUSD_READ:
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/* these operations can return data to userspace */
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if (retval > 0) {
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msg->datalen = MIN(retval, msg->parm.fops_msg.length);
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if (retval > 0)
|
||||
{
|
||||
msg->datalen = MIN((int)retval, (int)msg->parm.fops_msg.length);
|
||||
retval = msg->datalen;
|
||||
} else {
|
||||
}
|
||||
else
|
||||
{
|
||||
msg->datalen = 0;
|
||||
}
|
||||
break;
|
||||
|
||||
case FUSD_IOCTL:
|
||||
/* ioctl CAN (in read mode) return data to userspace */
|
||||
if ((retval == 0) &&
|
||||
(_IOC_DIR(msg->parm.fops_msg.cmd) & _IOC_READ))
|
||||
if (/*(retval == 0) && */ (_IOC_DIR(msg->parm.fops_msg.cmd) & _IOC_READ) )
|
||||
msg->datalen = _IOC_SIZE(msg->parm.fops_msg.cmd);
|
||||
else
|
||||
msg->datalen = 0;
|
||||
break;
|
||||
|
||||
default:
|
||||
/* open, close, write, etc. do not return data */
|
||||
msg->datalen = 0;
|
||||
@ -676,7 +742,8 @@ int fusd_return(fusd_file_info_t *file, ssize_t retval)
|
||||
/* pid is NOT copied back. */
|
||||
|
||||
/* send message to kernel */
|
||||
if (msg->datalen && msg->data != NULL) {
|
||||
if (msg->datalen && msg->data != NULL)
|
||||
{
|
||||
//printf("(msg->datalen [%d] && msg->data != NULL [%p]", msg->datalen, msg->data);
|
||||
iov[0].iov_base = msg;
|
||||
iov[0].iov_len = sizeof(fusd_msg_t);
|
||||
@ -684,20 +751,19 @@ int fusd_return(fusd_file_info_t *file, ssize_t retval)
|
||||
iov[1].iov_len = msg->datalen;
|
||||
driver_retval = writev(fd, iov, 2);
|
||||
}
|
||||
else {
|
||||
else
|
||||
{
|
||||
driver_retval = write(fd, msg, sizeof(fusd_msg_t));
|
||||
}
|
||||
|
||||
free_memory:
|
||||
FILE_UNLOCK(file);
|
||||
free_memory:
|
||||
|
||||
fusd_destroy(file);
|
||||
|
||||
ret = 0;
|
||||
if (driver_retval < 0)
|
||||
return -errno;
|
||||
else
|
||||
return 0;
|
||||
ret = -errno;
|
||||
goto exit;
|
||||
|
||||
exit_unlock:
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user