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// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build linux && (amd64 || arm64 || ppc64le)
#include <errno.h>
#include <stddef.h>
#include <stdint.h>
#include <string.h>
#include <signal.h>
#include "libcgo.h"
// go_sigaction_t is a C version of the sigactiont struct from
// defs_linux_amd64.go. This definition — and its conversion to and from struct
// sigaction — are specific to linux/amd64.
typedef struct {
uintptr_t handler;
uint64_t flags;
uintptr_t restorer;
uint64_t mask;
} go_sigaction_t;
// SA_RESTORER is part of the kernel interface.
// This is Linux i386/amd64 specific.
#ifndef SA_RESTORER
#define SA_RESTORER 0x4000000
#endif
int32_t
x_cgo_sigaction(intptr_t signum, const go_sigaction_t *goact, go_sigaction_t *oldgoact) {
int32_t ret;
struct sigaction act;
struct sigaction oldact;
size_t i;
_cgo_tsan_acquire();
memset(&act, 0, sizeof act);
memset(&oldact, 0, sizeof oldact);
if (goact) {
if (goact->flags & SA_SIGINFO) {
act.sa_sigaction = (void(*)(int, siginfo_t*, void*))(goact->handler);
} else {
act.sa_handler = (void(*)(int))(goact->handler);
}
sigemptyset(&act.sa_mask);
for (i = 0; i < 8 * sizeof(goact->mask); i++) {
if (goact->mask & ((uint64_t)(1)<<i)) {
sigaddset(&act.sa_mask, (int)(i+1));
}
}
act.sa_flags = (int)(goact->flags & ~(uint64_t)SA_RESTORER);
}
ret = sigaction((int)signum, goact ? &act : NULL, oldgoact ? &oldact : NULL);
if (ret == -1) {
// runtime.rt_sigaction expects _cgo_sigaction to return errno on error.
_cgo_tsan_release();
return errno;
}
if (oldgoact) {
if (oldact.sa_flags & SA_SIGINFO) {
oldgoact->handler = (uintptr_t)(oldact.sa_sigaction);
} else {
oldgoact->handler = (uintptr_t)(oldact.sa_handler);
}
oldgoact->mask = 0;
for (i = 0; i < 8 * sizeof(oldgoact->mask); i++) {
if (sigismember(&oldact.sa_mask, (int)(i+1)) == 1) {
oldgoact->mask |= (uint64_t)(1)<<i;
}
}
oldgoact->flags = (uint64_t)oldact.sa_flags;
}
_cgo_tsan_release();
return ret;
}
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