From 2b6a6e67af6f8f644a48f75efc1f44544c0d74f6 Mon Sep 17 00:00:00 2001
From: Hartmut Knaack <knaack.h@gmx.de>
Date: Sun, 31 May 2015 14:39:48 +0200
Subject: tools:iio: save errno first

The man-page of errno states, that errno should be saved before doing any
library call, as that call may have changed the value of errno. So, when
encountering any error, save errno first.
This patch affects generic_buffer.c, iio_event_monitor.c and iio_utils.c.

Signed-off-by: Hartmut Knaack <knaack.h@gmx.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
---
 tools/iio/generic_buffer.c    |  2 +-
 tools/iio/iio_event_monitor.c |  6 +++---
 tools/iio/iio_utils.c         | 14 +++++++-------
 3 files changed, 11 insertions(+), 11 deletions(-)

diff --git a/tools/iio/generic_buffer.c b/tools/iio/generic_buffer.c
index 0410948e23c2..7635aeb93dc8 100644
--- a/tools/iio/generic_buffer.c
+++ b/tools/iio/generic_buffer.c
@@ -296,8 +296,8 @@ int main(int argc, char **argv)
 	/* Attempt to open non blocking the access dev */
 	fp = open(buffer_access, O_RDONLY | O_NONBLOCK);
 	if (fp == -1) { /* If it isn't there make the node */
-		printf("Failed to open %s\n", buffer_access);
 		ret = -errno;
+		printf("Failed to open %s\n", buffer_access);
 		goto error_free_buffer_access;
 	}
 
diff --git a/tools/iio/iio_event_monitor.c b/tools/iio/iio_event_monitor.c
index 427c271ac0d6..f6fdab48d340 100644
--- a/tools/iio/iio_event_monitor.c
+++ b/tools/iio/iio_event_monitor.c
@@ -269,8 +269,8 @@ int main(int argc, char **argv)
 
 	fd = open(chrdev_name, 0);
 	if (fd == -1) {
-		fprintf(stdout, "Failed to open %s\n", chrdev_name);
 		ret = -errno;
+		fprintf(stdout, "Failed to open %s\n", chrdev_name);
 		goto error_free_chrdev_name;
 	}
 
@@ -279,8 +279,8 @@ int main(int argc, char **argv)
 	close(fd);
 
 	if (ret == -1 || event_fd == -1) {
-		fprintf(stdout, "Failed to retrieve event fd\n");
 		ret = -errno;
+		fprintf(stdout, "Failed to retrieve event fd\n");
 		goto error_free_chrdev_name;
 	}
 
@@ -291,8 +291,8 @@ int main(int argc, char **argv)
 				printf("nothing available\n");
 				continue;
 			} else {
-				perror("Failed to read event from device");
 				ret = -errno;
+				perror("Failed to read event from device");
 				break;
 			}
 		}
diff --git a/tools/iio/iio_utils.c b/tools/iio/iio_utils.c
index 1c0ca2f89e18..f12bc2e81c80 100644
--- a/tools/iio/iio_utils.c
+++ b/tools/iio/iio_utils.c
@@ -129,8 +129,8 @@ int iioutils_get_type(unsigned *is_signed,
 			}
 			sysfsfp = fopen(filename, "r");
 			if (sysfsfp == NULL) {
-				printf("failed to open %s\n", filename);
 				ret = -errno;
+				printf("failed to open %s\n", filename);
 				goto error_free_filename;
 			}
 
@@ -141,8 +141,8 @@ int iioutils_get_type(unsigned *is_signed,
 				     bits_used,
 				     &padint, shift);
 			if (ret < 0) {
-				printf("failed to pass scan type description\n");
 				ret = -errno;
+				printf("failed to pass scan type description\n");
 				goto error_close_sysfsfp;
 			}
 			*be = (endianchar == 'b');
@@ -332,8 +332,8 @@ int build_channel_array(const char *device_dir,
 			}
 			sysfsfp = fopen(filename, "r");
 			if (sysfsfp == NULL) {
-				free(filename);
 				ret = -errno;
+				free(filename);
 				count--;
 				goto error_cleanup_array;
 			}
@@ -505,8 +505,8 @@ int _write_sysfs_int(char *filename, char *basedir, int val, int verify)
 	sprintf(temp, "%s/%s", basedir, filename);
 	sysfsfp = fopen(temp, "w");
 	if (sysfsfp == NULL) {
-		printf("failed to open %s\n", temp);
 		ret = -errno;
+		printf("failed to open %s\n", temp);
 		goto error_free;
 	}
 	fprintf(sysfsfp, "%d", val);
@@ -514,8 +514,8 @@ int _write_sysfs_int(char *filename, char *basedir, int val, int verify)
 	if (verify) {
 		sysfsfp = fopen(temp, "r");
 		if (sysfsfp == NULL) {
-			printf("failed to open %s\n", temp);
 			ret = -errno;
+			printf("failed to open %s\n", temp);
 			goto error_free;
 		}
 		fscanf(sysfsfp, "%d", &test);
@@ -556,8 +556,8 @@ int _write_sysfs_string(char *filename, char *basedir, char *val, int verify)
 	sprintf(temp, "%s/%s", basedir, filename);
 	sysfsfp = fopen(temp, "w");
 	if (sysfsfp == NULL) {
-		printf("Could not open %s\n", temp);
 		ret = -errno;
+		printf("Could not open %s\n", temp);
 		goto error_free;
 	}
 	fprintf(sysfsfp, "%s", val);
@@ -565,8 +565,8 @@ int _write_sysfs_string(char *filename, char *basedir, char *val, int verify)
 	if (verify) {
 		sysfsfp = fopen(temp, "r");
 		if (sysfsfp == NULL) {
-			printf("could not open file to verify\n");
 			ret = -errno;
+			printf("could not open file to verify\n");
 			goto error_free;
 		}
 		fscanf(sysfsfp, "%s", temp);
-- 
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