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

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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
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5
Kernel/Syscall.cpp
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@ -3,6 +3,7 @@
#include "Syscall.h"
#include "Console.h"
#include "Scheduler.h"
#include <Kernel/ProcessTracer.h>
extern "C" void syscall_trap_entry(RegisterDump&);
extern "C" void syscall_trap_handler();
@ -251,6 +252,8 @@ static dword handle(RegisterDump& regs, dword function, dword arg1, dword arg2,
return current->process().sys$shm_unlink((const char*)arg1);
case Syscall::SC_ftruncate:
return current->process().sys$ftruncate((int)arg1, (off_t)arg2);
case Syscall::SC_systrace:
return current->process().sys$systrace((pid_t)arg1);
default:
kprintf("<%u> int0x82: Unknown function %u requested {%x, %x, %x}\n", current->process().pid(), function, arg1, arg2, arg3);
break;
@ -268,6 +271,8 @@ void syscall_trap_entry(RegisterDump& regs)
dword arg2 = regs.ecx;
dword arg3 = regs.ebx;
regs.eax = Syscall::handle(regs, function, arg1, arg2, arg3);
if (auto* tracer = current->process().tracer())
tracer->did_syscall(function, arg1, arg2, arg3, regs.eax);
current->process().big_lock().unlock();
}