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Code Issues Releases Activity

add 1s delay in set_direction to allow udev to set permissions

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This commit is contained in:
Michael Eitelwein
2017-11-11 19:08:02 +00:00
parent c87b0ca72a
commit 00cd5c09ad
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'; char filename[MAX_FILENAME]; filename[0] = '\0';
snprintf(filename, sizeof(filename), "/sys/class/gpio/gpio%d/direction", gpio); BUF2SMALL(filename); snprintf(filename, sizeof(filename), "/sys/class/gpio/gpio%d/direction", gpio); BUF2SMALL(filename);
if ((fd = open(filename, O_WRONLY)) < 0) { if ((fd = open(filename, O_WRONLY)) < 0) {
char err[256]; // if called as non-root, udev may need time to adjust file
snprintf(err, sizeof(err), "gpio_set_direction: could not open '%s' (%s)", filename, strerror(errno)); // permissions after setting up gpio
add_error_msg(err); sleep(1);
return -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]; char direction[16];