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Kernel: Add a systrace() syscall and implement /bin/strace using it.

Calling systrace(pid) gives you a file descriptor with a stream of the
syscalls made by a peer process. The process must be owned by the same
UID who calls systrace(). :^)
This commit is contained in:
Andreas Kling 2019-04-22 18:44:45 +02:00
parent 6693cfb26a
commit 5c68929aa1
12 changed files with 188 additions and 1 deletions

31
Kernel/ProcessTracer.cpp Normal file
View file

@ -0,0 +1,31 @@
#include <Kernel/ProcessTracer.h>
#include <AK/kstdio.h>
ProcessTracer::ProcessTracer(pid_t pid)
: m_pid(pid)
{
}
ProcessTracer::~ProcessTracer()
{
}
void ProcessTracer::did_syscall(dword function, dword arg1, dword arg2, dword arg3, dword result)
{
CallData data = { function, arg1, arg2, arg3, result };
m_calls.enqueue(data);
}
int ProcessTracer::read(byte* buffer, int buffer_size)
{
if (!m_calls.is_empty()) {
auto data = m_calls.dequeue();
// FIXME: This should not be an assertion.
ASSERT(buffer_size == sizeof(data));
memcpy(buffer, &data, sizeof(data));
return sizeof(data);
}
return 0;
}