如何抑制gpgme的警告？

Question

我试图在我的代码中使用GPGME来验证一些签名。但是，简单地初始化和发布GPGME上下文会导致val研发出大量警告。

例如：

#include <gpgme.h>

int main() {
    gpgme_check_version(NULL);
    gpgme_ctx_t my_ctx;
    gpgme_error_t gpg_err;

    gpg_err = gpgme_new(&my_ctx);

    gpgme_release(my_ctx);

    return 0;
}

用gcc -lgpgme -lassuan -lgpg-error main.c编译它，然后运行它。从valgrind -v ./a.out来看，这段代码似乎启动了6个不同的进程。我复制了相关的警告信息：

==19158== Warning: invalid file descriptor 1024 in syscall close()
==19158==    at 0x558DBC4: close (in /usr/lib/libc-2.26.so)
==19158==    by 0x4E65DF8: ??? (in /usr/lib/libgpgme.so.11.19.0)
==19158==    by 0x4E66D65: ??? (in /usr/lib/libgpgme.so.11.19.0)
==19158==    by 0x4E6736B: ??? (in /usr/lib/libgpgme.so.11.19.0)
==19158==    by 0x4E56572: gpgme_get_engine_info (in /usr/lib/libgpgme.so.11.19.0)
==19158==    by 0x4E56C87: ??? (in /usr/lib/libgpgme.so.11.19.0)
==19158==    by 0x4E6838F: gpgme_new (in /usr/lib/libgpgme.so.11.19.0)
==19158==    by 0x10880B: main (in /home/thedoctor/Programming/gpgmetest/mytest)
==19158== Warning: invalid file descriptor 1025 in syscall close()
==19158==    at 0x558DBC4: close (in /usr/lib/libc-2.26.so)
==19158==    by 0x4E65DF8: ??? (in /usr/lib/libgpgme.so.11.19.0)
==19158==    by 0x4E66D65: ??? (in /usr/lib/libgpgme.so.11.19.0)
==19158==    by 0x4E6736B: ??? (in /usr/lib/libgpgme.so.11.19.0)
==19158==    by 0x4E56572: gpgme_get_engine_info (in /usr/lib/libgpgme.so.11.19.0)
==19158==    by 0x4E56C87: ??? (in /usr/lib/libgpgme.so.11.19.0)
==19158==    by 0x4E6838F: gpgme_new (in /usr/lib/libgpgme.so.11.19.0)
==19158==    by 0x10880B: main (in /home/thedoctor/Programming/gpgmetest/mytest)
==19158== Warning: invalid file descriptor 1026 in syscall close()
==19158==    at 0x558DBC4: close (in /usr/lib/libc-2.26.so)
==19158==    by 0x4E65DF8: ??? (in /usr/lib/libgpgme.so.11.19.0)
==19158==    by 0x4E66D65: ??? (in /usr/lib/libgpgme.so.11.19.0)
==19158==    by 0x4E6736B: ??? (in /usr/lib/libgpgme.so.11.19.0)
==19158==    by 0x4E56572: gpgme_get_engine_info (in /usr/lib/libgpgme.so.11.19.0)
==19158==    by 0x4E56C87: ??? (in /usr/lib/libgpgme.so.11.19.0)
==19158==    by 0x4E6838F: gpgme_new (in /usr/lib/libgpgme.so.11.19.0)
==19158==    by 0x10880B: main (in /home/thedoctor/Programming/gpgmetest/mytest)
==19158== Warning: invalid file descriptor 1027 in syscall close()
==19158==    Use --log-fd=<number> to select an alternative log fd.
==19158==    at 0x558DBC4: close (in /usr/lib/libc-2.26.so)
==19158==    by 0x4E65DF8: ??? (in /usr/lib/libgpgme.so.11.19.0)
==19158==    by 0x4E66D65: ??? (in /usr/lib/libgpgme.so.11.19.0)
==19158==    by 0x4E6736B: ??? (in /usr/lib/libgpgme.so.11.19.0)
==19158==    by 0x4E56572: gpgme_get_engine_info (in /usr/lib/libgpgme.so.11.19.0)
==19158==    by 0x4E56C87: ??? (in /usr/lib/libgpgme.so.11.19.0)
==19158==    by 0x4E6838F: gpgme_new (in /usr/lib/libgpgme.so.11.19.0)
==19158==    by 0x10880B: main (in /home/thedoctor/Programming/gpgmetest/mytest)
==19158== Warning: invalid file descriptor 1028 in syscall close()
==19158==    at 0x558DBC4: close (in /usr/lib/libc-2.26.so)
==19158==    by 0x4E65DF8: ??? (in /usr/lib/libgpgme.so.11.19.0)
==19158==    by 0x4E66D65: ??? (in /usr/lib/libgpgme.so.11.19.0)
==19158==    by 0x4E6736B: ??? (in /usr/lib/libgpgme.so.11.19.0)
==19158==    by 0x4E56572: gpgme_get_engine_info (in /usr/lib/libgpgme.so.11.19.0)
==19158==    by 0x4E56C87: ??? (in /usr/lib/libgpgme.so.11.19.0)
==19158==    by 0x4E6838F: gpgme_new (in /usr/lib/libgpgme.so.11.19.0)
==19158==    by 0x10880B: main (in /home/thedoctor/Programming/gpgmetest/mytest)
==19158== Warning: invalid file descriptor 1029 in syscall close()
==19158==    at 0x558DBC4: close (in /usr/lib/libc-2.26.so)
==19158==    by 0x4E65DF8: ??? (in /usr/lib/libgpgme.so.11.19.0)
==19158==    by 0x4E66D65: ??? (in /usr/lib/libgpgme.so.11.19.0)
==19158==    by 0x4E6736B: ??? (in /usr/lib/libgpgme.so.11.19.0)
==19158==    by 0x4E56572: gpgme_get_engine_info (in /usr/lib/libgpgme.so.11.19.0)
==19158==    by 0x4E56C87: ??? (in /usr/lib/libgpgme.so.11.19.0)
==19158==    by 0x4E6838F: gpgme_new (in /usr/lib/libgpgme.so.11.19.0)
==19158==    by 0x10880B: main (in /home/thedoctor/Programming/gpgmetest/mytest)

对于6个不同的进程，总共重复完全相同的一组警告。似乎GPGME试图关闭一些不属于GPGME的文件描述符。

我的问题有两个：

1. 我是不是用错了gpgme？还有什么需要我做的吗？
2. 如果API的使用是正确的，我如何才能阻止这些警告来自valgrind？

我似乎无法为这些警告产生抑制作用。运行valgrind --gen-suppressions=all -v ./a.out不会在输出中显示任何抑制。我想这是因为这些都是警告而不是真正的错误。我试着自己写一篇压抑的文章，但我不知道该怎么写。通常，当我不得不写抑制词时，它们是为Memcheck:Leak编写的。但这些警告属于哪一类呢？

编辑:这是我试着写的一个抑制：

{
    gpgme-leak-fd
    fun:close
    ...
    fun:gpgme_new
}

编辑2:我试着悬赏，但它过期了。如果你对此有一个有效的答案，我会给你100英镑的奖金。

Answer 1

下面是丹McGee编写的GPGME的一些规则，摘自这里

{
   gpgme-static-get-engine-info
   Memcheck:Leak
   fun:malloc
   ...
   fun:gpgme_get_engine_info
}
{
   gpgme-static-set-engine-info
   Memcheck:Leak
   fun:malloc
   ...
   fun:_gpgme_set_engine_info
   fun:gpgme_set_engine_info
}
{
   gpgme-static-set-locale
   Memcheck:Leak
   fun:malloc
   fun:strdup
   fun:gpgme_set_locale
}