mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
227 lines
8.6 KiB
C
227 lines
8.6 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/assert.h"
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#include "libc/bits/bits.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/internal.h"
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#include "libc/calls/sigbits.h"
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#include "libc/calls/struct/sigaction-freebsd.internal.h"
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#include "libc/calls/struct/sigaction-linux.internal.h"
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#include "libc/calls/struct/sigaction-netbsd.h"
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#include "libc/calls/struct/sigaction-openbsd.internal.h"
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#include "libc/calls/struct/sigaction-xnu.internal.h"
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#include "libc/calls/struct/sigaction.h"
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#include "libc/calls/typedef/sigaction_f.h"
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#include "libc/calls/ucontext.h"
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#include "libc/dce.h"
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#include "libc/limits.h"
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#include "libc/macros.internal.h"
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#include "libc/mem/mem.h"
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#include "libc/runtime/runtime.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/sa.h"
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#include "libc/sysv/consts/sig.h"
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#include "libc/sysv/errfuns.h"
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#ifndef SWITCHEROO
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#define SWITCHEROO(S1, S2, A, B, C, D) \
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do { \
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autotype((S2).A) a = (typeof((S2).A))(S1).A; \
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autotype((S2).B) b = (typeof((S2).B))(S1).B; \
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autotype((S2).C) c = (typeof((S2).C))(S1).C; \
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typeof((S2).D) d; \
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memset(&d, 0, sizeof(d)); \
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memcpy(&d, &((S1).D), MIN(sizeof(d), sizeof((S1).D))); \
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(S2).A = a; \
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(S2).B = b; \
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(S2).C = c; \
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memset(&((S2).D), 0, sizeof((S2).D)); \
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memcpy(&((S2).D), &d, MIN(sizeof(d), sizeof((S2).D))); \
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} while (0);
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#endif
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union metasigaction {
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struct sigaction cosmo;
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struct sigaction_linux linux;
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struct sigaction_freebsd freebsd;
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struct sigaction_openbsd openbsd;
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struct sigaction_netbsd netbsd;
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struct sigaction_xnu_in xnu_in;
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struct sigaction_xnu_out xnu_out;
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};
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void __sigenter_netbsd(int, void *, void *);
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void __sigenter_freebsd(int, void *, void *);
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void __sigenter_openbsd(int, void *, void *);
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static void sigaction_cosmo2native(union metasigaction *sa) {
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if (!sa) return;
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switch (__hostos) {
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case LINUX:
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SWITCHEROO(sa->cosmo, sa->linux, sa_handler, sa_flags, sa_restorer,
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sa_mask);
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break;
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case XNU:
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SWITCHEROO(sa->cosmo, sa->xnu_in, sa_handler, sa_flags, sa_restorer,
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sa_mask);
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break;
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case FREEBSD:
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SWITCHEROO(sa->cosmo, sa->freebsd, sa_handler, sa_flags, sa_flags,
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sa_mask);
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break;
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case OPENBSD:
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SWITCHEROO(sa->cosmo, sa->openbsd, sa_handler, sa_flags, sa_flags,
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sa_mask);
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break;
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case NETBSD:
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SWITCHEROO(sa->cosmo, sa->netbsd, sa_handler, sa_flags, sa_flags,
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sa_mask);
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break;
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default:
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break;
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}
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}
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static void sigaction_native2cosmo(union metasigaction *sa) {
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if (!sa) return;
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switch (__hostos) {
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case LINUX:
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SWITCHEROO(sa->linux, sa->cosmo, sa_handler, sa_flags, sa_restorer,
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sa_mask);
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break;
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case XNU:
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SWITCHEROO(sa->xnu_out, sa->cosmo, sa_handler, sa_flags, sa_flags,
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sa_mask);
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break;
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case FREEBSD:
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SWITCHEROO(sa->freebsd, sa->cosmo, sa_handler, sa_flags, sa_flags,
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sa_mask);
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break;
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case OPENBSD:
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SWITCHEROO(sa->openbsd, sa->cosmo, sa_handler, sa_flags, sa_flags,
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sa_mask);
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break;
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case NETBSD:
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SWITCHEROO(sa->netbsd, sa->cosmo, sa_handler, sa_flags, sa_flags,
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sa_mask);
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break;
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default:
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break;
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}
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}
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/**
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* Installs handler for kernel interrupt, e.g.:
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*
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* void GotCtrlC(int sig, siginfo_t *si, ucontext_t *ctx);
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* struct sigaction sa = {.sa_sigaction = GotCtrlC,
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* .sa_flags = SA_RESETHAND|SA_RESTART|SA_SIGINFO};
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* CHECK_NE(-1, sigaction(SIGINT, &sa, NULL));
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*
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* @see xsigaction() for a much better api
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* @asyncsignalsafe
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* @vforksafe
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*/
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int(sigaction)(int sig, const struct sigaction *act, struct sigaction *oldact) {
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int64_t arg4, arg5;
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int rc, rva, oldrva;
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struct sigaction *ap, copy;
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assert(sizeof(struct sigaction) > sizeof(struct sigaction_linux) &&
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sizeof(struct sigaction) > sizeof(struct sigaction_xnu_in) &&
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sizeof(struct sigaction) > sizeof(struct sigaction_xnu_out) &&
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sizeof(struct sigaction) > sizeof(struct sigaction_freebsd) &&
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sizeof(struct sigaction) > sizeof(struct sigaction_openbsd) &&
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sizeof(struct sigaction) > sizeof(struct sigaction_netbsd));
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if (IsMetal()) return enosys(); /* TODO: Signals on Metal */
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if (!(0 < sig && sig < NSIG)) return einval();
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if (sig == SIGKILL || sig == SIGSTOP) return einval();
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if (!act) {
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rva = (int32_t)(intptr_t)SIG_DFL;
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} else if ((intptr_t)act->sa_handler < kSigactionMinRva) {
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rva = (int)(intptr_t)act->sa_handler;
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} else if ((intptr_t)act->sa_handler >= (intptr_t)&_base + kSigactionMinRva &&
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(intptr_t)act->sa_handler < (intptr_t)&_base + INT_MAX) {
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rva = (int)((uintptr_t)act->sa_handler - (uintptr_t)&_base);
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} else {
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return efault();
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}
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if (__vforked && rva != (intptr_t)SIG_DFL && rva != (intptr_t)SIG_IGN) {
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return einval();
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}
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if (!IsWindows()) {
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if (act) {
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memcpy(©, act, sizeof(copy));
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ap = ©
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if (IsXnu()) {
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ap->sa_restorer = (void *)&__sigenter_xnu;
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ap->sa_handler = (void *)&__sigenter_xnu;
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} else if (IsLinux()) {
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if (!(ap->sa_flags & SA_RESTORER)) {
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ap->sa_flags |= SA_RESTORER;
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ap->sa_restorer = &__restore_rt;
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}
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} else if (IsNetbsd()) {
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ap->sa_sigaction = (sigaction_f)__sigenter_netbsd;
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} else if (IsFreebsd()) {
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ap->sa_sigaction = (sigaction_f)__sigenter_freebsd;
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} else if (IsOpenbsd()) {
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ap->sa_sigaction = (sigaction_f)__sigenter_openbsd;
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} else {
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return enosys();
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}
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sigaction_cosmo2native((union metasigaction *)ap);
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} else {
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ap = NULL;
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}
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if (IsXnu()) {
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arg4 = (int64_t)(intptr_t)oldact; /* from go code */
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arg5 = 0;
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} else if (IsNetbsd()) {
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if (ap) {
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arg4 = (int64_t)(intptr_t)&__restore_rt_netbsd;
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arg5 = 2; /* netbsd/lib/libc/arch/x86_64/sys/__sigtramp2.S */
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} else {
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arg4 = 0;
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arg5 = 0; /* netbsd/lib/libc/arch/x86_64/sys/__sigtramp2.S */
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}
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} else {
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arg4 = 8; /* or linux whines */
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arg5 = 0;
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}
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if ((rc = sys_sigaction(sig, ap, oldact, arg4, arg5)) != -1) {
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sigaction_native2cosmo((union metasigaction *)oldact);
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}
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} else {
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if (oldact) {
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memset(oldact, 0, sizeof(*oldact));
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}
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rc = 0;
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}
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if (rc != -1 && !__vforked) {
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if (oldact) {
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oldrva = __sighandrvas[sig];
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oldact->sa_sigaction = (sigaction_f)(
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oldrva < kSigactionMinRva ? oldrva : (intptr_t)&_base + oldrva);
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}
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if (act) {
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__sighandrvas[sig] = rva;
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}
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}
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return rc;
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}
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