98 lines
2.9 KiB
C++
98 lines
2.9 KiB
C++
/*
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* 作者: leehomwu
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* 日期: 2011-05-14
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* 修订: 2011-06-11, 处理部分处理器会将出错时的 EIP 也入栈的情况
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* 描述: 捕获段错误、浮点错误，输出发生错误时的具体位置、调用路径
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* 使用: 在 main 函数所在文件包含该头文件即可
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* 示例: 当发生段错误或浮点错误时，会向STDOUT打印调用路径上的指令地址，类似：
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signal[8] catched when running code at 80486f0
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signal[8] catched when running code at 80488ea
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signal[8] catched when running code at 80488d9
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进一步运行命令行，解析指令地址:
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addr2line 80486f0 80488ea 80488d9 -s -C -f -e
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[可执行文件]
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得到输出：
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main
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newsig.cpp:14
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a()
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kk.cpp:23
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b()
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kk.cpp:19
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*/
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#ifndef __SEGV_CATCH_H
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#define __SEGV_CATCH_H
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#include <execinfo.h>
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#include <signal.h>
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#include <stdio.h>
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#ifndef __USE_GNU
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#define __USE_GNU
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#include <sys/ucontext.h>
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#include <ucontext.h>
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#undef __USE_GNU
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#else
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#include <sys/ucontext.h>
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#include <ucontext.h>
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#endif
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#ifdef __cplusplus
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static void initSegvCatch(void);
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class C_SEGVCATCH {
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public:
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C_SEGVCATCH() { initSegvCatch(); }
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};
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static C_SEGVCATCH C_segv_catch;
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#else
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static void initSegvCatch(void) __attribute__((constructor));
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#endif
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static void OnSIGSEGV(int, siginfo_t*, void*);
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static void initSegvCatch() {
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struct sigaction act;
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sigemptyset(&act.sa_mask);
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act.sa_sigaction = OnSIGSEGV;
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act.sa_flags = SA_SIGINFO;
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if (sigaction(SIGSEGV, &act, NULL) < 0 || sigaction(SIGFPE, &act, NULL) < 0) {
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perror("sigaction:");
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}
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}
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static void OnSIGSEGV(int signum, siginfo_t* info, void* ptr) {
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static int iTime;
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if (iTime++ >=
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1) { /* 容错处理：如果访问 ucontext_t 结构体时产生错误会进入该分支 */
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printf("ReEnter %s is not allowed!\n", __FUNCTION__);
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abort();
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}
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void* array[25];
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int nSize = backtrace(array, sizeof(array) / sizeof(array[0]));
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int i;
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for (i = nSize - 3; i > 2; i--) { /* 头尾几个地址不必输出 */
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/* 对array修正一下，使地址指向正在执行的代码 */
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printf("signal[%d] catched when running code at %x\n", signum,
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(long)array[i] - 1);
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}
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if (NULL != ptr) {
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ucontext_t* ptrUC = (ucontext_t*)ptr;
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int* pgregs = (int*)(&(ptrUC->uc_mcontext.gregs));
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int eip = pgregs[REG_RIP];
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if (eip != (long)array[i]) { /* 有的处理器会将出错时的 EIP 入栈 */
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printf("signal[%d] catched when running code at %x\n", signum,
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(long)array[i] - 1);
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}
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printf("signal[%d] catched when running code at %x\n", signum,
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eip); /* 出错时的指令地址 */
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} else {
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printf("signal[%d] catched when running code at unknown address\n", signum);
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}
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abort();
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}
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#endif // __SEGV_CATCH_H
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