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gpio.c: fail early in case of error when reading file

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Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>
This commit is contained in:
Brendan Le Foll
2014-11-26 13:56:27 +00:00
parent fefe0a24cd
commit 51cfc7981d
1 changed files with 6 additions and 2 deletions
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6
src/gpio/gpio.c
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@@ -451,6 +451,7 @@ mraa_gpio_read(mraa_gpio_context dev)
if (dev->value_fp == -1) {
if (mraa_gpio_get_valfp(dev) != MRAA_SUCCESS) {
syslog(LOG_ERR, "gpio: Failed to get value file pointer");
return -1;
}
}
else {
@@ -483,8 +484,11 @@ mraa_gpio_write(mraa_gpio_context dev, int value)
}
if (dev->value_fp == -1) {
mraa_gpio_get_valfp(dev);
if (mraa_gpio_get_valfp(dev) != MRAA_SUCCESS) {
return MRAA_ERROR_INVALID_RESOURCE;
}
}
if (lseek(dev->value_fp, 0, SEEK_SET) == -1) {
return MRAA_ERROR_INVALID_RESOURCE;
}