为系统调用制作通用的 valgrind 错误抑制

Question

在 C++ 项目的上下文中使用 valgrind，我一直在尝试抑制来自第三方库中的

uninitialised byte

的信息。如何针对以下类似警告生成特定抑制？system calls

Syscall param sendmsg(msg.msg_iov[12]) points to uninitialised byte(s) 
==9473==    at 0x740E6F7: sendmsg (sendmsg.c:28) 
==9473==    by 0xA2AB34A: tcp_send(int, msghdr const*, int) (in /usr/local/lib/libgrpc.so.15.0.0) 
==9473==    by 0xA2ACB6C: tcp_flush((anonymous namespace)::grpc_tcp*, grpc_error**) (in /usr/local/lib/libgrpc.so.15.0.0) 

Syscall param sendmsg(msg.msg_iov) points to uninitialised byte(s) 
==9473==    at 0x740E6F7: sendmsg (sendmsg.c:28) 
==9473==    by 0xA2AB34A: tcp_send(int, msghdr const*, int) (in /usr/local/lib/libgrpc.so.15.0.0) 
==9473==    by 0xA2ACB6C: tcp_flush((anonymous namespace)::grpc_tcp*, grpc_error**) (in /usr/local/lib/libgrpc.so.15.0.0) 

我都试过了

Syscall param sendmsg(msg.msg_iov[2]) points to uninitialised byte(s) 
==9473==    at 0x740E6F7: sendmsg (sendmsg.c:28) 
==9473==    by 0xA2AB34A: tcp_send(int, msghdr const*, int) (in /usr/local/lib/libgrpc.so.15.0.0) 
==9473==    by 0xA2ACB6C: tcp_flush((anonymous namespace)::grpc_tcp*, grpc_error**) (in /usr/local/lib/libgrpc.so.15.0.0) 

和

{
   sendmsg_uninitialized_bytes
   Memcheck:Param
   sendmsg(msg.msg_iov)
   fun:sendmsg
}

但是，它们都不起作用。

Answer 1

这是一个抑制示例：

{
   sendmsg_uninitialized_bytes
   Memcheck:Param
   sendmsg(msg.msg_iov*)
   fun:sendmsg
}

希望这对解决这个问题有帮助。