69 lines
2.0 KiB
C++
69 lines
2.0 KiB
C++
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#include "Log.h"
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#include "memory/MemoryManager.h"
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#include "sys/Syscall.h"
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#include "thread/Scheduler.h"
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Result<u64> sys_sigreturn(Registers* regs, SyscallArgs)
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{
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auto* current = Scheduler::current();
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current->sigreturn(regs);
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// Since we could be returning to anywhere in the program, we don't want to be changing the return value register
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// (RAX on x86_64). But our syscall framework doesn't allow that, so we just set it to its current value.
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return current->return_register();
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}
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Result<u64> sys_sigaction(Registers*, SyscallArgs args)
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{
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auto* current = Scheduler::current();
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int signo = (int)args[0];
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const struct sigaction* act = (const struct sigaction*)args[1];
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struct sigaction* oldact = (struct sigaction*)args[2];
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void* sigreturn = (void*)args[3];
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if (signo > NSIG) return err(EINVAL);
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if (signo <= 0) return err(EINVAL);
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if (oldact)
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{
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if (!MemoryManager::copy_to_user_typed(oldact, ¤t->signal_handlers[signo - 1])) return err(EFAULT);
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}
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if (act)
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{
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struct sigaction kact;
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if (!MemoryManager::copy_from_user_typed(act, &kact)) return err(EFAULT);
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kact.__sa_sigreturn = sigreturn;
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kinfoln("sigaction: installing signal handler for signo=%d: handler=%p, sigreturn=%p", signo,
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(void*)kact.sa_handler, sigreturn);
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current->signal_handlers[signo - 1] = kact;
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}
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return 0;
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}
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Result<u64> sys_kill(Registers*, SyscallArgs args)
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{
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auto* current = Scheduler::current();
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pid_t pid = (pid_t)args[0];
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int signo = (int)args[1];
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// FIXME: Support this case.
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if (pid <= 0) return err(ENOTSUP);
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auto* target = TRY(Result<Thread*>::from_option(Scheduler::find_by_pid(pid), ESRCH));
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if (current->auth.euid != 0 && current->auth.euid != target->auth.euid && current->auth.egid != target->auth.egid)
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return err(EPERM);
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if (target->is_kernel) return 0;
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if (signo == 0) return 0;
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target->pending_signals |= 1 << (signo - 1);
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return 0;
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}
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