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/*
* atheme-services: A collection of minimalist IRC services
* signal.c: Signal-handling routines.
*
* Copyright (c) 2005-2007 Atheme Project (http://www.atheme.org)
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/

#include "atheme.h"
#include "uplink.h"
#include "conf.h"
#include "internal.h"
#include <signal.h>

#ifndef MOWGLI_OS_WIN
# include <sys/wait.h>
#endif

static void childproc_check(void);

static volatile sig_atomic_t got_sighup, got_sigint, got_sigterm, got_sigchld, got_sigusr2;

/*
* A version of signal(2) that works more reliably across different
* platforms.
*
* It restarts interrupted system calls, does not reset the handler,
* and blocks the same signal from within the handler.
*/
static void
signal_empty_handler(int signum)
{
/* do nothing */
}

static void
signal_hup_handler(int signum)
{
got_sighup = 1;
}

static void
signal_int_handler(int signum)
{
got_sigint = 1;
}

static void
signal_term_handler(int signum)
{
got_sigterm = 1;
}

static void
signal_chld_handler(int signum)
{
got_sigchld = 1;
}

static void
signal_usr2_handler(int signum)
{
got_sigusr2 = 1;
}

/* XXX */
static void
signal_usr1_handler(int signum)
{
int n;
if (me.connected && curr_uplink != NULL &&
curr_uplink->conn != NULL)
{
if (chansvs.nick != NULL)
{
n = send(curr_uplink->conn->fd, ":", 1, 0);
n = send(curr_uplink->conn->fd, chansvs.nick, strlen(chansvs.nick), 0);
n = send(curr_uplink->conn->fd, " QUIT :Out of memory!\r\n", 23, 0);
}
n = send(curr_uplink->conn->fd, "ERROR :Panic! Out of memory.\r\n", 30, 0);
}
if (runflags & (RF_LIVE | RF_STARTING))
n = write(2, "Out of memory!\n", 15);
abort();
}

void init_signal_handlers(void)
{
#ifndef MOWGLI_OS_WIN
#ifdef SIGHUP
mowgli_signal_install_handler(SIGHUP, signal_hup_handler);
#endif

#ifdef SIGINT
mowgli_signal_install_handler(SIGINT, signal_int_handler);
#endif

#ifdef SIGTERM
mowgli_signal_install_handler(SIGTERM, signal_term_handler);
#endif

#ifdef SIGPIPE
mowgli_signal_install_handler(SIGPIPE, signal_empty_handler);
#endif

#ifdef SIGCHLD
mowgli_signal_install_handler(SIGCHLD, signal_chld_handler);
#endif

#ifdef SIGUSR1
mowgli_signal_install_handler(SIGUSR1, signal_usr1_handler);
#endif

#ifdef SIGUSR2
mowgli_signal_install_handler(SIGUSR2, signal_usr2_handler);
#endif
#endif
}

void check_signals(void)
{
/* rehash */
if (got_sighup)
{
got_sighup = 0;
slog(LG_INFO, "sighandler(): got SIGHUP, rehashing \2%s\2", config_file);

wallops(_("Got SIGHUP; reloading \2%s\2."), config_file);

if (db_save && !readonly)
{
slog(LG_INFO, "UPDATE: \2%s\2", "system console");
wallops(_("Updating database by request of \2%s\2."), "system console");
db_save(NULL);
}

slog(LG_INFO, "REHASH: \2%s\2", "system console");
wallops(_("Rehashing \2%s\2 by request of \2%s\2."), config_file, "system console");

/* reload the config, opening other logs besides the core log if needed. */
if (!conf_rehash())
wallops(_("REHASH of \2%s\2 failed. Please correct any errors in the file and try again."), config_file);

return;
}

/* usually caused by ^C */
if (got_sigint && (runflags & RF_LIVE))
{
got_sigint = 0;
wallops(_("Exiting on signal %d."), SIGINT);
if (chansvs.me != NULL && chansvs.me->me != NULL)
quit_sts(chansvs.me->me, "caught interrupt");
me.connected = false;
slog(LG_INFO, "sighandler(): caught interrupt; exiting...");
runflags |= RF_SHUTDOWN;
}
else if (got_sigint && !(runflags & RF_LIVE))
{
got_sigint = 0;
wallops(_("Got SIGINT; restarting."));

slog(LG_INFO, "RESTART: \2%s\2", "system console");
wallops(_("Restarting by request of \2%s\2."), "system console");

runflags |= RF_RESTART;
}

if (got_sigterm)
{
got_sigterm = 0;
wallops(_("Exiting on signal %d."), SIGTERM);
slog(LG_INFO, "sighandler(): got SIGTERM; exiting...");
runflags |= RF_SHUTDOWN;
}

if (got_sigusr2)
{
got_sigusr2 = 0;
wallops(_("Got SIGUSR2; restarting."));

slog(LG_INFO, "RESTART: \2%s\2", "system console");
wallops(_("Restarting by request of \2%s\2."), "system console");

runflags |= RF_RESTART;
}

if (got_sigchld)
{
got_sigchld = 0;
childproc_check();
}
}

mowgli_list_t childproc_list;

struct childproc
{
mowgli_node_t node;
pid_t pid;
char *desc;
void (*cb)(pid_t pid, int status, void *data);
void *data;
};

/* Registers a child process.
* Will call cb(pid, status, data) after the process terminates
* where status is the status from waitpid(2).
*/
void childproc_add(pid_t pid, const char *desc, void (*cb)(pid_t pid, int status, void *data), void *data)
{
struct childproc *p;

p = smalloc(sizeof(*p));
p->pid = pid;
p->desc = sstrdup(desc);
p->cb = cb;
p->data = data;
mowgli_node_add(p, &p->node, &childproc_list);
}

static void childproc_free(struct childproc *p)
{
free(p->desc);
free(p);
}

/* Forgets about all child processes with the given callback.
* Useful if the callback is in a module which is being unloaded.
*/
void childproc_delete_all(void (*cb)(pid_t pid, int status, void *data))
{
mowgli_node_t *n, *tn;
struct childproc *p;

MOWGLI_ITER_FOREACH_SAFE(n, tn, childproc_list.head)
{
p = n->data;
if (p->cb == cb)
{
mowgli_node_delete(&p->node, &childproc_list);
childproc_free(p);
}
}
}

static void childproc_check(void)
{
#ifndef MOWGLI_OS_WIN
pid_t pid;
int status;
mowgli_node_t *n;
struct childproc *p;

while ((pid = waitpid(-1, &status, WNOHANG)) > 0)
{
MOWGLI_ITER_FOREACH(n, childproc_list.head)
{
p = n->data;
if (p->pid == pid)
{
mowgli_node_delete(&p->node, &childproc_list);
if (p->cb)
p->cb(pid, status, p->data);
childproc_free(p);
break;
}
}
}
#endif
}

/* vim:cinoptions=>s,e0,n0,f0,{0,}0,^0,=s,ps,t0,c3,+s,(2s,us,)20,*30,gs,hs
* vim:ts=8
* vim:sw=8
* vim:noexpandtab
*/
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