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sysfs: address race condition from udev rules when exporting GPIO pins

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Signed-off-by: deadprogram <ron@hybridgroup.com>
This commit is contained in:
deadprogram 2017-04-01 22:07:47 +02:00
parent 9fc46368a4
commit 62ebd67dea
1 changed files with 13 additions and 1 deletions
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14
sysfs/digital_pin.go
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@ -6,6 +6,7 @@ import (
"os"
"strconv"
"syscall"
"time"
)
const (
@ -96,7 +97,18 @@ func (d *digitalPin) Export() error {
d.direction.Close()
}
d.direction, err = fs.OpenFile(fmt.Sprintf("%v/%v/direction", GPIOPATH, d.label), os.O_RDWR, 0644)
attempt := 0
for {
attempt++
d.direction, err = fs.OpenFile(fmt.Sprintf("%v/%v/direction", GPIOPATH, d.label), os.O_RDWR, 0644)
if err == nil {
break
}
if attempt > 10 {
return err
}
time.Sleep(10 * time.Millisecond)
}
if d.value != nil {
d.value.Close()