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Merge pull request #80 from MEitelwein/master

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add 1s delay in set_direction to allow udev to set permissions
This commit is contained in:
Robert Wolterman
2017-11-12 07:31:02 -06:00
committed by GitHub
parent c87b0ca72a 00cd5c09ad
commit 906beb0257
1 changed files with 11 additions and 4 deletions
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15
source/event_gpio.c
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@ -383,11 +383,18 @@ int gpio_set_direction(int gpio, unsigned int in_flag)
char filename[MAX_FILENAME]; filename[0] = '\0';
snprintf(filename, sizeof(filename), "/sys/class/gpio/gpio%d/direction", gpio); BUF2SMALL(filename);
if ((fd = open(filename, O_WRONLY)) < 0) {
char err[256];
snprintf(err, sizeof(err), "gpio_set_direction: could not open '%s' (%s)", filename, strerror(errno));
add_error_msg(err);
return -1;
// if called as non-root, udev may need time to adjust file
// permissions after setting up gpio
sleep(1);
if ((fd = open(filename, O_WRONLY)) < 0) {
char err[256];
snprintf(err, sizeof(err), "gpio_set_direction: could not open '%s' (%s)", filename, strerror(errno));
add_error_msg(err);
return -1;
}
}
char direction[16];