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Kernel+Userspace: Implement the accept4() system call

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Unlike accept() the new accept4() system call lets the caller specify
flags for the newly accepted socket file descriptor, such as
SOCK_CLOEXEC and SOCK_NONBLOCK.
This commit is contained in:
Gunnar Beutner 2021-05-16 19:56:11 +02:00 • committed by Andreas Kling
parent 529f605ac8
commit 89956cb0d6
7 changed files with 49 additions and 18 deletions
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27
Userland/DevTools/UserspaceEmulator/Emulator_syscalls.cpp
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@ -168,8 +168,8 @@ u32 Emulator::virt_syscall(u32 function, u32 arg1, u32 arg2, u32 arg3)
return virt$fchmod(arg1, arg2);
case SC_fchown:
return virt$fchown(arg1, arg2, arg3);
case SC_accept:
return virt$accept(arg1, arg2, arg3);
case SC_accept4:
return virt$accept4(arg1);
case SC_setsockopt:
return virt$setsockopt(arg1);
case SC_getsockname:
@ -452,17 +452,20 @@ mode_t Emulator::virt$umask(mode_t mask)
return syscall(SC_umask, mask);
}
int Emulator::virt$accept(int sockfd, FlatPtr address, FlatPtr address_length)
int Emulator::virt$accept4(FlatPtr params_addr)
{
socklen_t host_address_length = 0;
mmu().copy_from_vm(&host_address_length, address_length, sizeof(host_address_length));
auto host_buffer = ByteBuffer::create_zeroed(host_address_length);
int rc = syscall(SC_accept, sockfd, host_buffer.data(), &host_address_length);
if (rc < 0)
return rc;
mmu().copy_to_vm(address, host_buffer.data(), min((socklen_t)host_buffer.size(), host_address_length));
mmu().copy_to_vm(address_length, &host_address_length, sizeof(host_address_length));
return rc;
Syscall::SC_accept4_params params;
mmu().copy_from_vm(&params, params_addr, sizeof(params));
sockaddr_storage addr = {};
socklen_t addrlen;
mmu().copy_from_vm(&addrlen, (FlatPtr)params.addrlen, sizeof(socklen_t));
VERIFY(addrlen <= sizeof(addr));
int rc = accept4(params.sockfd, (sockaddr*)&addr, &addrlen, params.flags);
if (rc == 0) {
mmu().copy_to_vm((FlatPtr)params.addr, &addr, addrlen);
mmu().copy_to_vm((FlatPtr)params.addrlen, &addrlen, sizeof(socklen_t));
}
return rc < 0 ? -errno : rc;
}
int Emulator::virt$bind(int sockfd, FlatPtr address, socklen_t address_length)