在Java中，“ 5/0”语句不会在我的Linux机器上触发SIGFPE信号，为什么？

Question

我写了一个非常简单的C程序：

#include<stdio.h>

int main(){
    int a=2;
    int b=0;
    printf("%d\n", a/b);
}

并使用strace：strace ./a.out运行它并获得以下输出（仅粘贴尾部）

... ...
mprotect(0x600000, 4096, PROT_READ)     = 0
mprotect(0x7f04c7fb8000, 4096, PROT_READ) = 0
munmap(0x7f04c7f96000, 127640)          = 0
--- SIGFPE (Floating point exception) @ 0 (0) ---
+++ killed by SIGFPE +++
Floating point exception

输出符合我的期望，因为它已被SIGFPE信号杀死。

但是，用Java编写的同一程序不会收到SIGFPE信号，有人知道Java如何处理“被零除”异常吗？

public class Main {

  public static void main(String[] args) {
    int a = 2;
    int b = 0;
    System.out.println(a / b);
  }
}

strace java -Xcomp主要

... ...
mprotect(0xf6949000, 8171520, PROT_READ|PROT_WRITE) = 0
mprotect(0xf6949000, 8171520, PROT_READ|PROT_EXEC) = 0
munmap(0xf774f000, 5727)                = 0
mmap2(NULL, 331776, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0xfffffffff68d0000
mprotect(0xf68d0000, 4096, PROT_NONE)   = 0
clone(child_stack=0xf6920494, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tidptr=0xf6920bd8, tls=0xf6920bd8, child_tidptr=0xff9c5520) = 958
futex(0xf6920bd8, FUTEX_WAIT, 958, NULL) = 0
exit_group(0)

Answer 1

在这里，它引发了SIGFPE。

你忘了跟strace孩子们说话。将-f选项添加到strace，您应该看到类似以下内容：

[pid  2304] read(3, "\312\376\272\276\0\0\0001\0n\n\0\23\0I\t\0\3\0J\7\0K\n\0L\0M\n\0N\0"..., 2369) = 2369
[pid  2304] --- SIGFPE (Floating point exception) @ 0 (0) ---
[pid  2304] rt_sigreturn(0x1c50800)     = 5
[pid  2304] write(2, "Exception in thread \"main\" ", 27Exception in thread "main" ) = 27
[pid  2304] write(2, "java.lang.ArithmeticException: /"..., 40java.lang.ArithmeticException: / by zero) = 40
[pid  2304] write(2, "\n", 1