hi, i found the following code in apache web server code.
if the signal occurs after the wait system call, but before the result of
the system call is stored in "wait_or_timeout_retval", the fact, that
the system call succeeded is lost.
this is (1) a bug in apache and (2) a problem of me that i want to solve.
i thought others would have solved it, but this is obviously not true :-(
now perhaps it is not interesting, wether the wait call succeeded, because
you can start it again. but what about a call to "read()" ? i MUST know,
wether it worked or wether it was interrupted by a signal!
byebye
Erik
o-------------------- snap
static JMP_BUF wait_timeout_buf; static int wait_or_timeout_retval = -1;
static void longjmp_out_of_alarm (int sig) {
siglongjmp (wait_timeout_buf, 1);
}
int wait_or_timeout (int *status) {
wait_or_timeout_retval = -1;
if (sigsetjmp(wait_timeout_buf, 1) != 0) {
errno = ETIMEDOUT;
return wait_or_timeout_retval;
}
signal (SIGALRM, longjmp_out_of_alarm);
alarm(1);
wait_or_timeout_retval = wait(status);
alarm(0);
return wait_or_timeout_retval;
}
o----------------------- snip
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