Increase error reporting on iiod and network backend

This was taken from Lar's old branch "stresstest"
analogdevicesinc@dc33705

and adds a few more error output when things go wrong.

Signed-off-by: Lars-Peter Clausen <[email protected]>
Signed-off-by: Robin Getz <[email protected]>

iiod-client.c

@@ -1,7 +1,7 @@
 /*
  * libiio - Library for interfacing industrial I/O (IIO) devices
  *
- * Copyright (C) 2014-2016 Analog Devices, Inc.
+ * Copyright (C) 2014-2020 Analog Devices, Inc.
  * Author: Paul Cercueil <[email protected]>
  *
  * This library is free software; you can redistribute it and/or
@@ -43,8 +43,10 @@ static ssize_t iiod_client_read_integer(struct iiod_client *client,
 	do {
 		ret = client->ops->read_line(client->pdata,
 				desc, buf, sizeof(buf));
-		if (ret < 0)
+		if (ret < 0) {
+			ERROR("READ LINE: %zu\n", ret);
 			return ret;
+		}
 
 		for (i = 0; i < (unsigned int) ret; i++) {
 			if (buf[i] != '\n') {
@@ -568,9 +570,10 @@ static int iiod_client_read_mask(struct iiod_client *client,
 		return -ENOMEM;
 
 	ret = iiod_client_read_all(client, desc, buf, words * 8 + 1);
-	if (ret < 0)
+	if (ret < 0) {
+		ERROR("READ ALL: %zu\n", ret);
 		goto out_buf_free;
-	else
+	} else
 		ret = 0;
 
 	buf[words*8] = '\0';
@@ -606,24 +609,30 @@ ssize_t iiod_client_read_unlocked(struct iiod_client *client, void *desc,
 			iio_device_get_id(dev), (unsigned long) len);
 
 	ret = iiod_client_write_all(client, desc, buf, strlen(buf));
-	if (ret < 0)
+	if (ret < 0) {
+		ERROR("WRITE ALL: %zu\n", ret);
 		return ret;
+	}
 
 	do {
 		int to_read;
 
 		ret = iiod_client_read_integer(client, desc, &to_read);
-		if (ret < 0)
+		if (ret < 0) {
+			ERROR("READ INTEGER: %zu\n", ret);
 			return ret;
+		}
 		if (to_read < 0)
 			return (ssize_t) to_read;
 		if (!to_read)
 			break;
 
 		if (mask) {
 			ret = iiod_client_read_mask(client, desc, mask, words);
-			if (ret < 0)
+			if (ret < 0) {
+				ERROR("READ ALL: %zu\n", ret);
 				return ret;
+			}
 
 			mask = NULL; /* We read the mask only once */
 		}

network.c

@@ -1,7 +1,7 @@
 /*
  * libiio - Library for interfacing industrial I/O (IIO) devices
  *
- * Copyright (C) 2014-2015 Analog Devices, Inc.
+ * Copyright (C) 2014-2020 Analog Devices, Inc.
  * Author: Paul Cercueil <[email protected]>
  *
  * This library is free software; you can redistribute it and/or
@@ -735,8 +735,10 @@ static int network_open(const struct iio_device *dev,
 		goto out_mutex_unlock;
 
 	ret = create_socket(pdata->addrinfo, DEFAULT_TIMEOUT_MS);
-	if (ret < 0)
+	if (ret < 0) {
+		ERROR("Create socket: %d\n", ret);
 		goto out_mutex_unlock;
+	}
 
 	ppdata->io_ctx.fd = ret;
 	ppdata->io_ctx.cancelled = false;
@@ -745,8 +747,10 @@ static int network_open(const struct iio_device *dev,
 
 	ret = iiod_client_open_unlocked(pdata->iiod_client,
 			&ppdata->io_ctx, dev, samples_count, cyclic);
-	if (ret < 0)
+	if (ret < 0) {
+		ERROR("Opend unlocked: %d\n", ret);
 		goto err_close_socket;
+	}
 
 	ret = setup_cancel(&ppdata->io_ctx);
 	if (ret < 0)
@@ -849,8 +853,10 @@ static ssize_t read_all(struct iio_network_io_context *io_ctx,
 	uintptr_t ptr = (uintptr_t) dst;
 	while (len) {
 		ssize_t ret = network_recv(io_ctx, (void *) ptr, len, 0);
-		if (ret < 0)
+		if (ret < 0) {
+			ERROR("NETWORK RECV: %zu\n", ret);
 			return ret;
+		}
 		ptr += ret;
 		len -= ret;
 	}
@@ -892,8 +898,10 @@ static ssize_t network_read_mask(struct iio_network_io_context *io_ctx,
 	ssize_t ret;
 
 	ret = read_integer(io_ctx, &read_len);
-	if (ret < 0)
+	if (ret < 0) {
+		ERROR("READ INTEGER: %zu\n", ret);
 		return ret;
+	}
 
 	if (read_len > 0 && mask) {
 		size_t i;
@@ -1354,15 +1362,18 @@ static ssize_t network_read_line(struct iio_context_pdata *pdata,
 			ret = network_recv(io_ctx, NULL, to_trunc, MSG_TRUNC);
 		else
 			ret = network_recv(io_ctx, dst - ret, to_trunc, 0);
-		if (ret < 0)
+		if (ret < 0) {
+			ERROR("NETWORK RECV: %zu\n", ret);
 			return ret;
+		}
 
 		bytes_read += to_trunc;
 	} while (!found && len);
 
-	if (!found)
+	if (!found) {
+		ERROR("EIO: %zu\n", ret);
 		return -EIO;
-	else
+	} else
 		return bytes_read;
 #else
 	for (i = 0; i < len - 1; i++) {