static struct iio_context * get_context(int fd)
{
struct iio_context *ctx;
char *xml;
long xml_len = exec_command("PRINT\r\n", fd);
if (xml_len < 0) {
errno = (int) -xml_len;
return NULL;
}
DEBUG("Server returned a XML string of length %li\n", xml_len);
xml = malloc(xml_len);
if (!xml) {
errno = ENOMEM;
return NULL;
}
DEBUG("Reading XML string...\n");
read_all(xml, xml_len, fd);
DEBUG("Creating context from XML...\n");
ctx = iio_create_xml_context_mem(xml, xml_len);
if (ctx)
ctx->xml = xml;
else
free(xml);
return ctx;
}
struct iio_context * iiod_client_create_context(
struct iiod_client *client, int desc)
{
struct iio_context *ctx = NULL;
size_t xml_len;
char *xml;
int ret;
iio_mutex_lock(client->lock);
ret = iiod_client_exec_command(client, desc, "PRINT\r\n");
if (ret < 0)
goto out_unlock;
xml_len = (size_t) ret;
xml = malloc(xml_len + 1);
if (!xml) {
ret = -ENOMEM;
goto out_unlock;
}
/* +1: Also read the trailing \n */
ret = (int) iiod_client_read_all(client, desc, xml, xml_len + 1);
if (ret < 0)
goto out_free_xml;
ctx = iio_create_xml_context_mem(xml, xml_len);
if (!ctx)
ret = -errno;
out_free_xml:
free(xml);
out_unlock:
iio_mutex_unlock(client->lock);
if (!ctx)
errno = -ret;
return ctx;
}
int main(int argc, char **argv)
{
char *xml;
struct iio_context *ctx;
int c, option_index = 0, arg_index = 0, xml_index = 0, ip_index = 0;
enum backend backend = LOCAL;
while ((c = getopt_long(argc, argv, "+hn:x:",
options, &option_index)) != -1) {
switch (c) {
case 'h':
usage();
return EXIT_SUCCESS;
case 'n':
if (backend != LOCAL) {
fprintf(stderr, "-x and -n are mutually exclusive\n");
return EXIT_FAILURE;
}
backend = NETWORK;
arg_index += 2;
ip_index = arg_index;
break;
case 'x':
if (backend != LOCAL) {
fprintf(stderr, "-x and -n are mutually exclusive\n");
return EXIT_FAILURE;
}
backend = XML;
arg_index += 2;
xml_index = arg_index;
break;
case '?':
return EXIT_FAILURE;
}
}
if (arg_index >= argc) {
fprintf(stderr, "Incorrect number of arguments.\n\n");
usage();
return EXIT_FAILURE;
}
if (backend == XML)
ctx = iio_create_xml_context(argv[xml_index]);
else if (backend == NETWORK)
ctx = iio_create_network_context(argv[ip_index]);
else
ctx = iio_create_default_context();
if (!ctx) {
fprintf(stderr, "Unable to create IIO context\n");
return EXIT_FAILURE;
}
xml = strdup(iio_context_get_xml(ctx));
if (!xml) {
iio_context_destroy(ctx);
return EXIT_FAILURE;
}
printf("XML generated:\n\n%s\n\n", xml);
iio_context_destroy(ctx);
ctx = iio_create_xml_context_mem(xml, strlen(xml));
if (!ctx) {
fprintf(stderr, "Unable to re-generate context\n");
} else {
printf("Context re-creation from generated XML suceeded!\n");
iio_context_destroy(ctx);
}
free(xml);
return EXIT_SUCCESS;
}