tools: gpio: Print error string on IOCTL failures
Add to error messages the error description by concatenating
output of strerror() function to error messages print out by
gpio-utils.c on IOCTL failures.
Rationalize error messages, while at there, making all of them
look the same.
Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/tools/gpio/gpio-utils.c b/tools/gpio/gpio-utils.c
index b86a32d..cf7e2f3 100644
--- a/tools/gpio/gpio-utils.c
+++ b/tools/gpio/gpio-utils.c
@@ -76,7 +76,8 @@
fd = open(chrdev_name, 0);
if (fd == -1) {
ret = -errno;
- fprintf(stderr, "Failed to open %s\n", chrdev_name);
+ fprintf(stderr, "Failed to open %s, %s\n",
+ chrdev_name, strerror(errno));
goto exit_close_error;
}
@@ -92,8 +93,8 @@
ret = ioctl(fd, GPIO_GET_LINEHANDLE_IOCTL, &req);
if (ret == -1) {
ret = -errno;
- fprintf(stderr, "Failed to issue GET LINEHANDLE IOCTL (%d)\n",
- ret);
+ fprintf(stderr, "Failed to issue %s (%d), %s\n",
+ "GPIO_GET_LINEHANDLE_IOCTL", ret, strerror(errno));
}
exit_close_error:
@@ -118,8 +119,9 @@
ret = ioctl(fd, GPIOHANDLE_SET_LINE_VALUES_IOCTL, data);
if (ret == -1) {
ret = -errno;
- fprintf(stderr, "Failed to issue %s (%d)\n",
- "GPIOHANDLE_SET_LINE_VALUES_IOCTL", ret);
+ fprintf(stderr, "Failed to issue %s (%d), %s\n",
+ "GPIOHANDLE_SET_LINE_VALUES_IOCTL", ret,
+ strerror(errno));
}
return ret;
@@ -141,8 +143,9 @@
ret = ioctl(fd, GPIOHANDLE_GET_LINE_VALUES_IOCTL, data);
if (ret == -1) {
ret = -errno;
- fprintf(stderr, "Failed to issue %s (%d)\n",
- "GPIOHANDLE_GET_LINE_VALUES_IOCTL", ret);
+ fprintf(stderr, "Failed to issue %s (%d), %s\n",
+ "GPIOHANDLE_GET_LINE_VALUES_IOCTL", ret,
+ strerror(errno));
}
return ret;