glibc提供的取程式名全局變量program_invocation_short_name

不用自己寫代碼，errno.h中提供了兩個可直接使用的全局變量，GCC預設打開了宏_GNU_SOURCE：

（CUtils::get_program_name();   CUtils::get_program_short_name();）

<a href="https://github.com/eyjian/mooon/blob/master/common_library/include/mooon/sys/utils.h" target="_blank">https://github.com/eyjian/mooon/blob/master/common_library/include/mooon/sys/utils.h</a>

const char* CUtils::get_program_name()

{

    //#define _GNU_SOURCE

    //#include errno.h&gt;

    return program_invocation_name;

}

const char* CUtils::get_program_short_name()

    return program_invocation_short_name;

效果代碼（g++ -g -o x x.cpp）：

//#define _GNU_SOURCE

#include errno.h&gt;

#include stdio.h&gt;

int main()

        printf("program_invocation_name: %s\n", program_invocation_name);

        printf("program_invocation_short_name: %s\n", program_invocation_short_name);

        return 0;

運作結果：

# /tmp/X/x

program_invocation_name: /tmp/X/x

program_invocation_short_name: x