This shows the operation of the SA_RESTART flag. If you don't want
the system call to return to the caller with -1 and EINTR, you
have to use this.
#include <stdio.h>
#include <signal.h>
#include <errno.h>
#include <string.h>
void foo(int unused) { puts("\7Alarm"); }
main(int x)
{
struct sigaction sa;
char buf[1];
int i;
memset(&sa, 0x00, sizeof(sa));
if(x > 1)
sa.sa_flags = SA_RESTART;
sa.sa_handler = foo;
sigaction(SIGALRM, &sa, NULL);
alarm(1);
i = read(0, buf, 1);
printf("%d, %s\n", i, strerror(errno));
}
Cheers,
Dick Johnson
Penguin : Linux version 2.3.13 on an i686 machine (400.59 BogoMips).
Warning : The end of the world as we know it requires a new calendar.
Seconds : 2010448 (until Y2K)
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