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> I tried the following script on OpenBSD 5 with Python 3.3: ...
Bad news: the script doesn't hang if Python is build without threads.
Short C program to test interrupted syscalls:
------------- 
#include <signal.h>
#include <stdio.h>
#include <pthread.h>
void
handler(int signum)
{
printf("HANDLER!\n");
}
void _noop()
{
}
int main()
{
int s = SIGALRM;
char buffer[1024];
int n;
static int dummy = 0;
pthread_t thread1;
pthread_create(&thread1, NULL, (void *) _noop, &dummy);
pthread_join(thread1, NULL);
signal(s, handler);
siginterrupt(s, 1);
alarm(1);
printf("read...\n");
n = read(0, buffer, 1024);
printf("read->%i\n", n);
return 0;
}
-------------
read() is interrupted after 1 second, it works.