Incorect signal handling ?

[Daniel Podlejski <underley@underley.eu.org>]

Hi,

there is litlle programm:

#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <signal.h>
#include <errno.h>
#include <sys/stat.h>
#include <fcntl.h>

static void empty(int sig)
{
	printf ("hello\n");
	return;
}

void main()
{
        int fd, a;
        char buf[512];

	if (fd = open("/tmp/nic", O_RDONLY) < 0)
	{
		perror ("open");
		exit(1);
	}

	signal (SIGALRM, empty);
	alarm (1);

        a = read(fd, buf, 511);

        while (a && a != -1) a = read(fd, buf, 511);

	if (a == -1)
	{
		perror ("read");
		exit(1);
	}
	else printf ("EOF\n");

        exit(0);
}

I open /tmp/nic and run compiled program.
There should be error EINTR in read, but isn't.
Why ?

-- 
Daniel Podlejski <underley@underley.eu.org>
   ... Here await the birth of the son
   The seventh, the heavenly, the chosen one ...