Invoking a syscall won't necessarily print anything to the kernel log.
On 7 Jun 2014 07:50, "Dipanjan Das" [off-list ref] wrote:

Hi,

I want to invoke getpid() system call using syscall. Here's the code
snippet below. But, I can't find anything in dmesg|tail output.

#include <sys/types.h>

int main()
{
       pid_tret = syscall(20);
       return 0;
}

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