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tools: gpio: Print error string on IOCTL failures

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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>
This commit is contained in:
Jacopo Mondi 2017-09-28 15:01:44 +02:00 committed by Linus Walleij
parent a3c1295280
commit d327a224ba
1 changed files with 10 additions and 7 deletions
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17
tools/gpio/gpio-utils.c
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@ -76,7 +76,8 @@ int gpiotools_request_linehandle(const char *device_name, unsigned int *lines,
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 @@ int gpiotools_request_linehandle(const char *device_name, unsigned int *lines,
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 @@ int gpiotools_set_values(const int fd, struct gpiohandle_data *data)
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 @@ int gpiotools_get_values(const int fd, struct gpiohandle_data *data)
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;