2008/4/8 Mike Frysinger <vapier@xxxxxxxxxx>:
> if you're worried about portability, you should be using sigaction().
> otherwise, use of signal() should really assume Linux semantics.
I could always redo the patch to use sigaction with SA_RESETHAND if
you prefer.
The call to signal is, I believe, necessary unless we use switch to
using sigaction :-
orbital:misc$ cat defsignal.c
#include <stdio.h>
#include <string.h>
#include <signal.h>
#include <unistd.h>
static void
say(const char *s)
{
size_t n = strlen(s);
write(1, s, n);
}
static void
handler(int sig)
{
void (*oldhandler)(int);
oldhandler = signal(sig, SIG_IGN);
signal(sig, oldhandler);
if (oldhandler == SIG_DFL)
say("default\n");
else if (oldhandler == SIG_IGN)
say("ignored\n");
else if (oldhandler == handler)
say("unchanged\n");
else
say("something else\n");
}
int
main (int argc, char *argv[])
{
signal(SIGINT, handler);
kill(getpid(), SIGINT);
return 0;
}
orbital:misc$ gcc -o defsignal defsignal.c
orbital:misc$ ./defsignal
unchanged
orbital:misc$ uname -a
Linux orbital 2.6.24-1-686 #1 SMP Thu Mar 27 17:45:04 UTC 2008 i686 GNU/Linux
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