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>
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@ -76,7 +76,8 @@ int gpiotools_request_linehandle(const char *device_name, unsigned int *lines,
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fd = open(chrdev_name, 0);
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if (fd == -1) {
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ret = -errno;
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fprintf(stderr, "Failed to open %s\n", chrdev_name);
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fprintf(stderr, "Failed to open %s, %s\n",
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chrdev_name, strerror(errno));
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goto exit_close_error;
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}
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@ -92,8 +93,8 @@ int gpiotools_request_linehandle(const char *device_name, unsigned int *lines,
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ret = ioctl(fd, GPIO_GET_LINEHANDLE_IOCTL, &req);
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if (ret == -1) {
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ret = -errno;
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fprintf(stderr, "Failed to issue GET LINEHANDLE IOCTL (%d)\n",
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ret);
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fprintf(stderr, "Failed to issue %s (%d), %s\n",
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"GPIO_GET_LINEHANDLE_IOCTL", ret, strerror(errno));
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}
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exit_close_error:
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@ -118,8 +119,9 @@ int gpiotools_set_values(const int fd, struct gpiohandle_data *data)
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ret = ioctl(fd, GPIOHANDLE_SET_LINE_VALUES_IOCTL, data);
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if (ret == -1) {
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ret = -errno;
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fprintf(stderr, "Failed to issue %s (%d)\n",
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"GPIOHANDLE_SET_LINE_VALUES_IOCTL", ret);
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fprintf(stderr, "Failed to issue %s (%d), %s\n",
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"GPIOHANDLE_SET_LINE_VALUES_IOCTL", ret,
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strerror(errno));
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}
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return ret;
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@ -141,8 +143,9 @@ int gpiotools_get_values(const int fd, struct gpiohandle_data *data)
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ret = ioctl(fd, GPIOHANDLE_GET_LINE_VALUES_IOCTL, data);
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if (ret == -1) {
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ret = -errno;
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fprintf(stderr, "Failed to issue %s (%d)\n",
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"GPIOHANDLE_GET_LINE_VALUES_IOCTL", ret);
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fprintf(stderr, "Failed to issue %s (%d), %s\n",
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"GPIOHANDLE_GET_LINE_VALUES_IOCTL", ret,
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strerror(errno));
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}
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return ret;
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