c - 为什么使用信号处理程序在此代码中出现分段错误?
问题描述
我在我的程序中编写了一个信号处理程序,但是在这个文件结构中我遇到了分段错误。但是,如果一切都在一个文件中,那么一切正常。据我了解,它无法访问返回地址。我该如何解决?
“测试.h”
#ifndef TEST_H
#define TEST_H
#include <string.h>
#include <setjmp.h>
#include <signal.h>
static jmp_buf g_env;
void sig_handler(int sig);
endif TEST_H
“测试.c”
#include "test.h"
void sig_handler(int sig) {
psignal(sig, "Signal");
siglongjmp(g_env, 1);
}
“主要.c”
#include "test.h"
int main(void) {
struct sigaction act;
memset(&act, 0, sizeof(act));
act.sa_handler = sig_handler;
sigemptyset(&act.sa_mask);
sigaddset(&act.sa_mask, SIGSEGV);
sigaction(SIGSEGV, &act, 0);
if (!sigsetjmp(g_env, 1)) {
raise(SIGSEGV);
}
return (1);
}
“结果:”
Signal: Segmentation fault
Segmentation fault (core dumped)
“瓦尔格林德:”
==44698== Command: ./a.out
==44698==
Signal: Segmentation fault
==44698== Warning: client switching stacks? SP change: 0x1ffeffee08 --> 0xf7c1f413060a2966
==44698== to suppress, use: --max-stackframe=593925450715481250 or greater
==44698== Jump to the invalid address stated on the next line
==44698== at 0xF7C1F413060A2966: ???
==44698== Address 0xf7c1f413060a2966 is not stack'd, malloc'd or (recently) free'd
==44698==
==44698==
==44698== Process terminating with default action of signal 11 (SIGSEGV): dumping core
==44698== Bad permissions for mapped region at address 0xF7C1F413060A2966
==44698== at 0xF7C1F413060A2966: ???
==44698== Invalid write of size 8
==44698== at 0x482F120: _vgnU_freeres (vg_preloaded.c:59)
==44698== Address 0xf7c1f413060a295e is not stack'd, malloc'd or (recently) free'd
==44698==
==44698==
==44698== Process terminating with default action of signal 11 (SIGSEGV)
==44698== General Protection Fault
==44698== at 0x482F120: _vgnU_freeres (vg_preloaded.c:59)
解决方案
这是因为您有不同的实例g_env
- 每个翻译单元都有不同的g_env
. 因此, 中g_env
使用的缓冲区sigsetjmp
与siglongjmp
.
只需从以下位置删除static
:
static jmp_buf g_env;
现在,将只有一个g_env
.
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