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/* $Id: cleanup.c,v 1.1.1.1 2001/05/12 23:00:06 cegger Exp $
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******************************************************************************
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LibGG - Functions for adding and removing cleanup callbacks
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Copyright (C) 1998 Marcus Sundberg [marcus@ggi-project.org]
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of this software and associated documentation files (the "Software"),
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to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense,
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and/or sell copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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THE AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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******************************************************************************
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typedef struct funclist {
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struct funclist *next;
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static funclist *firstfunc = NULL;
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static ggcleanup_func *currentfunc = NULL;
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static int is_registered = 0;
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static int force_exit = 0;
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static void do_cleanup(void)
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funclist *curr = firstfunc, *prev;
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while (curr != NULL) {
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currentfunc = curr->func;
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curr->func(curr->arg);
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/* Make sure we don't call the function again */
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ggUnregisterCleanup(prev->func, prev->arg);
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static void cleanup_function(void)
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static void cleanup_function_ret(int retval)
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#if defined(HAVE_SIGNAL) || defined(HAVE_SIGACTION)
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typedef void (ggsighandler)(int);
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ggsighandler *oldhandler;
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struct sigaction oldsa;
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static gg_siginfo siglist[] = {
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{ SIGQUIT, SIG_ERR },
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{ SIGTRAP, SIG_ERR },
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{ SIGABRT, SIG_ERR },
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{ SIGSEGV, SIG_ERR },
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{ SIGPIPE, SIG_ERR },
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{ SIGALRM, SIG_ERR },
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{ SIGTERM, SIG_ERR },
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{ SIGSTKFLT, SIG_ERR },
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#if defined(SIGPOLL) && (SIGPOLL != SIGIO)
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{ SIGPOLL, SIG_ERR },
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{ SIGXCPU, SIG_ERR },
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{ SIGXFSZ, SIG_ERR },
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{ SIGVTALRM, SIG_ERR },
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{ SIGPROF, SIG_ERR },
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{ SIGLOST, SIG_ERR },
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{ SIGUNUSED, SIG_ERR }
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#define SIGLIST_LEN sizeof(siglist)/sizeof(gg_siginfo)
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static void sighandler(int signum)
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ggsighandler *oldfunc = NULL;
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for (i = 0; i < SIGLIST_LEN; i++) {
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if (siglist[i].sig == signum) {
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if (siglist[i].oldhandler == SIG_IGN) {
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signal(signum, sighandler);
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if (siglist[i].oldhandler != SIG_DFL) {
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oldfunc = siglist[i].oldhandler;
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fprintf(stderr, "Terminating on signal %d\n", signum);
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cleanup_function_ret(signum);
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#ifdef HAVE_SIGACTION
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static void setsa(struct sigaction *sa, ggsighandler *func)
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sa->sa_handler = func;
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sigemptyset(&sa->sa_mask);
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static void unregister_sighandler(void)
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for (i = 0; i < SIGLIST_LEN; i++) {
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if (siglist[i].oldhandler == SIG_ERR) continue;
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if (sigaction(siglist[i].sig, NULL, &sa) != 0) continue;
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if (sa.sa_flags == 0 && sa.sa_handler == sighandler) {
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sigaction(siglist[i].sig, &siglist[i].oldsa, NULL);
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/* Someone else has changed this signal action, so
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we shouldn't touch it */
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siglist[i].oldhandler = SIG_ERR;
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static void register_sighandler(void)
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for (i = 0; i < SIGLIST_LEN; i++) {
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if (sigaction(siglist[i].sig, NULL, &siglist[i].oldsa) != 0) {
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if (siglist[i].oldsa.sa_handler == SIG_DFL ||
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siglist[i].oldsa.sa_handler == SIG_IGN) {
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setsa(&sa, sighandler);
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if (sigaction(siglist[i].sig, &sa, NULL) != 0) {
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siglist[i].oldhandler = siglist[i].oldsa.sa_handler;
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#else /* HAVE_SIGACTION */
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static void unregister_sighandler(void)
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for (i = 0; i < SIGLIST_LEN; i++) {
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ggsighandler *oldfunc;
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if (siglist[i].oldhandler == SIG_ERR) continue;
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oldfunc = signal(siglist[i].sig, siglist[i].oldhandler);
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if (oldfunc != sighandler) {
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/* Someone else has changed this signal handler, so
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we shouldn't touch it */
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signal(siglist[i].sig, oldfunc);
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siglist[i].oldhandler = SIG_ERR;
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static void register_sighandler(void)
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for (i = 0; i < SIGLIST_LEN; i++) {
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ggsighandler *oldfunc;
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oldfunc = signal(siglist[i].sig, sighandler);
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if (oldfunc != SIG_DFL &&
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oldfunc != SIG_IGN) {
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/* If there's a sighandler registered already we don't
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if (oldfunc != SIG_ERR) {
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signal(siglist[i].sig, oldfunc);
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siglist[i].oldhandler = oldfunc;
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#endif /* HAVE_SIGACTION */
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#else /* HAVE_SIGNAL || HAVE_SIGACTION */
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#define register_sighandler() /* empty */
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#define unregister_sighandler() /* empty */
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#endif /* HAVE_SIGNAL || HAVE_SIGACTION */
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int ggRegisterCleanup(ggcleanup_func *func, void *arg)
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ggLock(_gg_global_mutex);
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register_sighandler();
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if (!is_registered) {
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if (atexit(cleanup_function) != 0) {
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if ((newlist = malloc(sizeof(funclist))) == NULL) {
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newlist->func = func;
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/* Insert first in list */
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newlist->next = firstfunc;
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ggUnlock(_gg_global_mutex);
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int ggUnregisterCleanup(ggcleanup_func *func, void *arg)
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funclist *curr = firstfunc, *prev = NULL;
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if (func == currentfunc) {
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/* Don't unregister a function while it is being called */
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ggLock(_gg_global_mutex);
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while (curr != NULL) {
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if (curr->func == func && curr->arg == arg) {
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if (curr == firstfunc) firstfunc = curr->next;
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else prev->next = curr->next;
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if (firstfunc == NULL) unregister_sighandler();
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ggUnlock(_gg_global_mutex);
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ggUnlock(_gg_global_mutex);
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return GGI_ENOTALLOC;
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void ggCleanupForceExit(void)
added
removed
gg/cleanup.c
