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https://github.com/ashinn/chibi-scheme.git
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8b5eb68238
They can be close()d explicitly with close-file-descriptor, and will close() on gc, but only explicitly closing the last port on them will close the fileno. Notably needed for network sockets where we open separate input and output ports on the same socket.
143 lines
4.6 KiB
C
143 lines
4.6 KiB
C
/* signal.c -- process signals interface */
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/* Copyright (c) 2009-2011 Alex Shinn. All rights reserved. */
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/* BSD-style license: http://synthcode.com/license.txt */
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#define SEXP_MAX_SIGNUM 32
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static sexp sexp_signal_contexts[SEXP_MAX_SIGNUM];
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static struct sigaction call_sigaction, call_sigdefault, call_sigignore;
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static void sexp_call_sigaction (int signum, siginfo_t *info, void *uctx) {
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sexp ctx;
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#if ! SEXP_USE_GREEN_THREADS
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sexp sigctx, handler;
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sexp_gc_var1(args);
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#endif
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ctx = sexp_signal_contexts[signum];
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if (ctx) {
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#if SEXP_USE_GREEN_THREADS
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sexp_global(ctx, SEXP_G_THREADS_SIGNALS) =
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sexp_make_fixnum((1UL<<signum) | sexp_unbox_fixnum(sexp_global(ctx, SEXP_G_THREADS_SIGNALS)));
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#else
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handler = sexp_vector_ref(sexp_global(ctx, SEXP_G_SIGNAL_HANDLERS),
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sexp_make_fixnum(signum));
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if (sexp_applicablep(handler)) {
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sigctx = sexp_make_child_context(ctx, NULL);
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sexp_gc_preserve1(sigctx, args);
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args = sexp_cons(sigctx, sexp_make_fixnum(signum), SEXP_NULL);
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sexp_apply(sigctx, handler, args);
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sexp_gc_release1(sigctx);
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}
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#endif
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}
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}
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static sexp sexp_set_signal_action (sexp ctx, sexp self, sexp signum, sexp newaction) {
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int res;
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sexp oldaction;
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if (! (sexp_fixnump(signum) && sexp_unbox_fixnum(signum) > 0
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&& sexp_unbox_fixnum(signum) < SEXP_MAX_SIGNUM))
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return sexp_xtype_exception(ctx, self, "not a valid signal number", signum);
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if (! (sexp_procedurep(newaction) || sexp_opcodep(newaction)
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|| sexp_booleanp(newaction)))
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return sexp_type_exception(ctx, self, SEXP_PROCEDURE, newaction);
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if (! sexp_vectorp(sexp_global(ctx, SEXP_G_SIGNAL_HANDLERS)))
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sexp_global(ctx, SEXP_G_SIGNAL_HANDLERS)
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= sexp_make_vector(ctx, sexp_make_fixnum(SEXP_MAX_SIGNUM), SEXP_FALSE);
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oldaction = sexp_vector_ref(sexp_global(ctx, SEXP_G_SIGNAL_HANDLERS), signum);
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res = sigaction(sexp_unbox_fixnum(signum),
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(sexp_booleanp(newaction) ?
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(sexp_truep(newaction) ? &call_sigdefault : &call_sigignore)
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: &call_sigaction),
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NULL);
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if (res)
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return sexp_user_exception(ctx, self, "couldn't set signal", signum);
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sexp_vector_set(sexp_global(ctx, SEXP_G_SIGNAL_HANDLERS), signum, newaction);
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sexp_signal_contexts[sexp_unbox_fixnum(signum)] = ctx;
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return oldaction;
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}
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#if SEXP_BSD
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#include <sys/time.h>
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#ifndef __DragonFly__
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#include <sys/param.h>
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#include <sys/sysctl.h>
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#include <sys/proc.h>
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#endif
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#include <sys/sysctl.h>
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#include <sys/user.h>
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static sexp sexp_pid_cmdline (sexp ctx, int pid) {
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size_t reslen = sizeof(struct kinfo_proc);
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struct kinfo_proc res;
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int name[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PID, pid};
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if (sysctl(name, 4, &res, &reslen, NULL, 0) >= 0) {
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#if defined(__APPLE__) || defined(__NetBSD__)
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return sexp_c_string(ctx, res.kp_proc.p_comm, -1);
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#elif __OpenBSD__
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return sexp_c_string(ctx, res.p_comm, -1);
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#elif __DragonFly__
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return sexp_c_string(ctx, res.kp_comm, -1);
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#else
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return sexp_c_string(ctx, res.ki_comm, -1);
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#endif
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} else {
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return SEXP_FALSE;
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}
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}
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#else
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/* #include <sys/syscall.h> */
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/* #include <linux/sysctl.h> */
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/* #define CMDLINE_LENGTH 512 */
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/* static sexp sexp_pid_cmdline (sexp ctx, int pid) { */
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/* struct __sysctl_args args; */
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/* char cmdline[CMDLINE_LENGTH]; */
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/* size_t cmdline_length; */
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/* int name[] = { CTL_KERN, KERN_OSTYPE }; */
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/* memset(&args, 0, sizeof(struct __sysctl_args)); */
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/* args.name = name; */
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/* args.nlen = sizeof(name)/sizeof(name[0]); */
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/* args.oldval = cmdline; */
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/* args.oldlenp = &cmdline_length; */
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/* cmdline_length = sizeof(cmdline); */
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/* if (syscall(SYS__sysctl, &args) == -1) { */
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/* return SEXP_FALSE; */
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/* } else { */
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/* return sexp_c_string(ctx, cmdline, -1); */
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/* } */
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/* } */
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#endif
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static pid_t sexp_fork_and_kill_threads (sexp ctx) {
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pid_t res = fork();
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#if SEXP_USE_GREEN_THREADS
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if (res == 0) { /* child */
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sexp_global(ctx, SEXP_G_THREADS_FRONT) = SEXP_NULL;
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sexp_global(ctx, SEXP_G_THREADS_BACK) = SEXP_NULL;
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sexp_global(ctx, SEXP_G_THREADS_PAUSED) = SEXP_NULL;
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}
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#endif
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return res;
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}
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static void sexp_init_signals (sexp ctx, sexp env) {
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call_sigaction.sa_sigaction = sexp_call_sigaction;
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#if SEXP_USE_GREEN_THREADS
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call_sigaction.sa_flags = SA_SIGINFO | SA_RESTART /* | SA_NODEFER */;
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sigfillset(&call_sigaction.sa_mask);
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#else
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call_sigaction.sa_flags = SA_SIGINFO | SA_RESTART | SA_NODEFER;
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#endif
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call_sigdefault.sa_handler = SIG_DFL;
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call_sigignore.sa_handler = SIG_IGN;
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memset(sexp_signal_contexts, 0, sizeof(sexp_signal_contexts));
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}
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