diff options
Diffstat (limited to 'extras/mini-os/lib/xs.c')
-rw-r--r-- | extras/mini-os/lib/xs.c | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/extras/mini-os/lib/xs.c b/extras/mini-os/lib/xs.c new file mode 100644 index 0000000000..b654b0ee5d --- /dev/null +++ b/extras/mini-os/lib/xs.c @@ -0,0 +1,187 @@ +/* + * libxs-compatible layer + * + * Samuel Thibault <Samuel.Thibault@eu.citrix.net>, 2007-2008 + * + * Mere wrapper around xenbus_* + */ + +#ifdef HAVE_LIBC +#include <os.h> +#include <lib.h> +#include <xs.h> +#include <xenbus.h> +#include <stdlib.h> +#include <unistd.h> + +static inline int _xs_fileno(struct xs_handle *h) { + return (intptr_t) h; +} + +struct xs_handle *xs_daemon_open() +{ + int fd = alloc_fd(FTYPE_XENBUS); + files[fd].xenbus.events = NULL; + printk("xs_daemon_open -> %d, %p\n", fd, &files[fd].xenbus.events); + return (void*)(intptr_t) fd; +} + +void xs_daemon_close(struct xs_handle *h) +{ + int fd = _xs_fileno(h); + struct xenbus_event *event; + for (event = files[fd].xenbus.events; event; event = event->next) + free(event); + files[fd].type = FTYPE_NONE; +} + +int xs_fileno(struct xs_handle *h) +{ + return _xs_fileno(h); +} + +void *xs_read(struct xs_handle *h, xs_transaction_t t, + const char *path, unsigned int *len) +{ + char *value; + char *msg; + + msg = xenbus_read(t, path, &value); + if (msg) { + printk("xs_read(%s): %s\n", path, msg); + return NULL; + } + + if (len) + *len = strlen(value); + return value; +} + +bool xs_write(struct xs_handle *h, xs_transaction_t t, + const char *path, const void *data, unsigned int len) +{ + char value[len + 1]; + char *msg; + + memcpy(value, data, len); + value[len] = 0; + + msg = xenbus_write(t, path, value); + if (msg) { + printk("xs_write(%s): %s\n", path, msg); + return false; + } + return true; +} + +static bool xs_bool(char *reply) +{ + if (!reply) + return true; + free(reply); + return false; +} + +bool xs_rm(struct xs_handle *h, xs_transaction_t t, const char *path) +{ + return xs_bool(xenbus_rm(t, path)); +} + +static void *xs_talkv(struct xs_handle *h, xs_transaction_t t, + enum xsd_sockmsg_type type, + struct write_req *iovec, + unsigned int num_vecs, + unsigned int *len) +{ + struct xsd_sockmsg *msg; + void *ret; + + msg = xenbus_msg_reply(type, t, iovec, num_vecs); + ret = malloc(msg->len); + memcpy(ret, (char*) msg + sizeof(*msg), msg->len); + if (len) + *len = msg->len - 1; + free(msg); + return ret; +} + +static void *xs_single(struct xs_handle *h, xs_transaction_t t, + enum xsd_sockmsg_type type, + const char *string, + unsigned int *len) +{ + struct write_req iovec; + + iovec.data = (void *)string; + iovec.len = strlen(string) + 1; + + return xs_talkv(h, t, type, &iovec, 1, len); +} + +char *xs_get_domain_path(struct xs_handle *h, unsigned int domid) +{ + char domid_str[MAX_STRLEN(domid)]; + + sprintf(domid_str, "%u", domid); + + return xs_single(h, XBT_NULL, XS_GET_DOMAIN_PATH, domid_str, NULL); +} + +char **xs_directory(struct xs_handle *h, xs_transaction_t t, + const char *path, unsigned int *num) +{ + char *msg; + char **entries, **res; + char *entry; + int i, n; + int size; + + msg = xenbus_ls(t, path, &res); + if (msg) { + printk("xs_directory(%s): %s\n", path, msg); + return NULL; + } + + size = 0; + for (n = 0; res[n]; n++) + size += strlen(res[n]) + 1; + + entries = malloc(n * sizeof(char *) + size); + entry = (char *) (&entries[n]); + + for (i = 0; i < n; i++) { + int l = strlen(res[i]) + 1; + memcpy(entry, res[i], l); + free(res[i]); + entries[i] = entry; + entry += l; + } + + *num = n; + return entries; +} + +bool xs_watch(struct xs_handle *h, const char *path, const char *token) +{ + int fd = _xs_fileno(h); + printk("xs_watch(%s, %s)\n", path, token); + return xs_bool(xenbus_watch_path_token(XBT_NULL, path, token, &files[fd].xenbus.events)); +} + +char **xs_read_watch(struct xs_handle *h, unsigned int *num) +{ + int fd = _xs_fileno(h); + struct xenbus_event *event; + event = files[fd].xenbus.events; + files[fd].xenbus.events = event->next; + printk("xs_read_watch() -> %s %s\n", event->path, event->token); + *num = 2; + return (char **) &event->path; +} + +bool xs_unwatch(struct xs_handle *h, const char *path, const char *token) +{ + printk("xs_unwatch(%s, %s)\n", path, token); + return xs_bool(xenbus_unwatch_path_token(XBT_NULL, path, token)); +} +#endif |