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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(). :^)
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12 changed files with 188 additions and 1 deletions
31
Kernel/ProcessTracer.cpp
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31
Kernel/ProcessTracer.cpp
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#include <Kernel/ProcessTracer.h>
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#include <AK/kstdio.h>
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ProcessTracer::ProcessTracer(pid_t pid)
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: m_pid(pid)
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{
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}
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ProcessTracer::~ProcessTracer()
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{
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}
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void ProcessTracer::did_syscall(dword function, dword arg1, dword arg2, dword arg3, dword result)
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{
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CallData data = { function, arg1, arg2, arg3, result };
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m_calls.enqueue(data);
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}
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int ProcessTracer::read(byte* buffer, int buffer_size)
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{
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if (!m_calls.is_empty()) {
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auto data = m_calls.dequeue();
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// FIXME: This should not be an assertion.
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ASSERT(buffer_size == sizeof(data));
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memcpy(buffer, &data, sizeof(data));
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return sizeof(data);
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}
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return 0;
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}
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