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// socket++ library. sig.C
// Copyright (C) 1992-1996 Gnanasekaran Swaminathan <gs4t@virginia.edu>
//
// Permission is granted to use at your own risk and distribute this software
// in source and binary forms provided the above copyright notice and this
// paragraph are preserved on all copies. This software is provided "as is"
// with no express or implied warranty.
#include <signal.h>
#include <sig.h>
//explicit template instantiation.
typedef sig::phnd phnd;
typedef sig::phndlist phndlist;
//template class list<phnd>;
//template class map<int, phndlist, less<int> >;
//static sigerr se; //commended out by Herbert Straub
// Change all se to sigerr
siginit siginit::init;
sig& sig::nal = *siginit::init.s;
typedef void (*sighnd_type) (int);
extern "C" {
static void sighandler (int signo) {
sig::nal.kill (signo);
}
}
sig::hnd::hnd (int s)
: signo (s)
{
sig::nal.set (signo, this);
}
sig::hnd::~hnd ()
{
sig::nal.unset (signo, this);
}
bool sig::set (int signo, sig::hnd* hnd)
{
if (hnd == 0) return false;
phndlist& v = smap [signo];
if (v.empty ()) {
#ifndef WIN32
struct sigaction sa;
if (sigaction (signo, 0, &sa) == -1) throw sigerr();
if (sa.sa_handler != sighnd_type (&sighandler)) {
// setting for the first time
sa.sa_handler = (void(*)(int)) sighnd_type (&sighandler);
if (sigemptyset (&sa.sa_mask) == -1) throw sigerr();
sa.sa_flags = 0;
if (sigaction (signo, &sa, 0) == -1) throw sigerr();
}
#endif //windows does not define sigaction
//basically, this is a way to handle some kind of error that can't exist on windows.
//see http://svn.haxx.se/dev/archive-2004-01/0685.shtml
v.push_back (hnd);
return true;
}
phndlist::iterator j = find (v.begin(), v.end (), hnd);
if (j == v.end ()) {
v.push_back (hnd);
return true;
}
return false;
}
bool sig::unset (int signo, sig::hnd* hnd)
{
if (hnd == 0) return false;
phndlist& v = smap [signo];
phndlist::iterator j = find (v.begin(), v.end (), hnd);
if (j != v.end ()) {
v.erase (j);
return true;
}
return false;
}
void sig::unset (int signo)
{
phndlist& v = smap [signo];
v.erase (v.begin (), v.end ());
#ifndef WIN32
struct sigaction sa;
if (sigaction (signo, 0, &sa) == -1) throw sigerr();
if (sa.sa_handler == sighnd_type (&sighandler)) {
sa.sa_handler = (void(*)(int)) sighnd_type (SIG_DFL);
if (sigemptyset (&sa.sa_mask) == -1) throw sigerr();
sa.sa_flags = 0;
if (sigaction (signo, &sa, 0) == -1) throw sigerr();
}
#endif //windows does not define sigaction
}
void sig::mask (int signo) const
{
#ifndef WIN32
sigset_t s;
if (sigemptyset (&s) == -1) throw sigerr();
if (sigaddset (&s, signo) == -1) throw sigerr();
if (sigprocmask (SIG_BLOCK, &s, 0) == -1) throw sigerr();
#endif //windows does not define sigset_t
}
void sig::unmask (int signo) const
{
#ifndef WIN32
sigset_t s;
if (sigemptyset (&s) == -1) throw sigerr();
if (sigaddset (&s, signo) == -1) throw sigerr();
if (sigprocmask (SIG_UNBLOCK, &s, 0) == -1) throw sigerr();
#endif //windows does not define sigset_t
}
void sig::mask (int siga, int sigb) const
{
#ifndef WIN32
struct sigaction sa;
if (sigaction (siga, 0, &sa) == -1) throw sigerr();
if (sa.sa_handler != sighnd_type (&sighandler)) {
sa.sa_handler = (void(*)(int)) sighnd_type (&sighandler);
if (sigemptyset (&sa.sa_mask) == -1) throw sigerr();
sa.sa_flags = 0;
}
if (sigaddset (&sa.sa_mask, sigb) == -1) throw sigerr();
if (sigaction (siga, &sa, 0) == -1) throw sigerr();
#endif //windows does not define sigaction
}
void sig::unmask (int siga, int sigb) const
{
#ifndef WIN32
struct sigaction sa;
if (sigaction (siga, 0, &sa) == -1) throw sigerr();
if (sa.sa_handler != sighnd_type (&sighandler)) {
sa.sa_handler = (void(*)(int)) sighnd_type (&sighandler);
if (sigemptyset (&sa.sa_mask) == -1) throw sigerr();
sa.sa_flags = 0;
} else {
if (sigdelset (&sa.sa_mask, sigb) == -1) throw sigerr();
}
if (sigaction (siga, &sa, 0) == -1) throw sigerr();
#endif //windows does not define sigaction
}
void sig::sysresume (int signo, bool set) const
{
#ifndef WIN32
struct sigaction sa;
if (sigaction (signo, 0, &sa) == -1) throw sigerr();
if (sa.sa_handler != sighnd_type (&sighandler)) {
sa.sa_handler = (void(*)(int)) sighnd_type (&sighandler);
if (sigemptyset (&sa.sa_mask) == -1) throw sigerr();
sa.sa_flags = 0;
}
#if !(defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__bsdi__) || defined(__sun__) || defined(__linux__) || defined(__APPLE__))
// Early SunOS versions may have SA_INTERRUPT. I can't confirm.
if (set == false)
sa.sa_flags |= SA_INTERRUPT;
else
sa.sa_flags &= ~SA_INTERRUPT;
if (sigaction (signo, &sa, 0) == -1) throw sigerr();
#endif
#endif //windows does not define sigaction
}
struct procsig {
int signo;
procsig (int s): signo (s) {}
void operator () (phnd& ph) { (*ph) (signo); }
};
void sig::kill (int signo)
{
phndlist& v = smap [signo];
// struct procsig used to be here // LN
for_each (v.begin (), v.end (), procsig (signo));
}
sigset_t sig::pending () const
{
#ifndef WIN32
sigset_t s;
if (sigemptyset (&s) == -1) throw sigerr();
if (sigpending (&s) == -1) throw sigerr();
return s;
#else
return true;//is this the right behavior for windows?
#endif //windows does not define sigset_t
}
bool sig::ispending (int signo) const
{
#ifndef WIN32
sigset_t s = pending ();
switch (sigismember (&s, signo)) {
case 0: return false;
case 1: return true;
}
throw sigerr();
#else
return true;//is this the right behavior for windows?
#endif //windows does not define sigset_t
}
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