如何检查 GDB 中函数的返回值? [英] How to inspect the return value of a function in GDB?

问题描述

假设返回值未分配给变量，是否可以检查 gdb 中函数的返回值?

Is it possible to inspect the return value of a function in gdb assuming the return value is not assigned to a variable?

推荐答案

我想有更好的方法可以做到，但是 finish 命令执行直到当前堆栈帧弹出并打印返回值——给定程序

I imagine there are better ways to do it, but the finish command executes until the current stack frame is popped off and prints the return value -- given the program

int fun() {
    return 42;
}

int main( int argc, char *v[] ) {
    fun();
    return 0;
}

你可以这样调试 --

(gdb) r
Starting program: /usr/home/hark/a.out 

Breakpoint 1, fun () at test.c:2
2               return 42;
(gdb) finish
Run till exit from #0  fun () at test.c:2
main () at test.c:7
7               return 0;
Value returned is $1 = 42
(gdb) 

finish 命令可以缩写为 fin.不要使用 f，它是 frame 命令的缩写！

The finish command can be abbreviated as fin. Do NOT use the f, which is abbreviation of frame command!

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