In article <[EMAIL PROTECTED]> you wrote:
> On Sat, 18 Apr 1998, Herbert Xu wrote:
>> This should work:
>>
>> static int wait_or_timeout_retval = -1;
>>
>> static void alarm_handler(int sig) {
>> errno = ETIMEDOUT;
>> }
>>
>> int wait_or_timeout (int *status) {
>> struct sigaction act;
>>
>> wait_or_timeout_retval = -1;
>>
>> sigaction(SIGALRM, 0, &act);
>> act.sa_handler = alarm_handler;
>> act.sa_flags &= ~SA_RESTART;
>> sigaction(SIGALRM, &act, 0);
>> alarm(1);
>> wait_or_timeout_retval = wait(status);
>> alarm(0);
>> return wait_or_timeout_retval;
>> }
> i do not think, this works.
> alarm() calls setitimer(). setitimer() modifies "errno".
> so, setting errno inside the signal handler does not work, i think.
That's easy to fix. Just store ETIMEDOUT in some other variable that is
reset at the start of wait_or_timeout and store the result in errno if wait
fails with EINTR.
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Email: Herbert Xu ~{PmV>HI~} <[EMAIL PROTECTED]>
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