Add stubs for getgid, getpid, getegid, geteuid and socket

Author: fwsGonzo

lib/tinykvm/linux/system_calls.cpp

@@ -650,6 +650,13 @@ void Machine::setup_linux_system_calls()
 			SYSPRINT("getpid() = %lld\n", regs.rax);
 			cpu.set_registers(regs);
 		});
+	Machine::install_syscall_handler(
+		SYS_socket, [](vCPU& cpu) { // SOCKET
+			auto& regs = cpu.registers();
+			regs.rax = -ENOSYS;
+			SYSPRINT("socket(...) = %lld\n", regs.rax);
+			cpu.set_registers(regs);
+		});
 	Machine::install_syscall_handler(
 		SYS_exit, [](vCPU& cpu) { // EXIT
 #ifdef VERBOSE_GUEST_EXITS
@@ -739,12 +746,30 @@ void Machine::setup_linux_system_calls()
 					 regs.rdi, regs.rax);
 			cpu.set_registers(regs);
 		});
+	Machine::install_syscall_handler(
+		SYS_getgid, [](vCPU& cpu) { // GETGID
+			auto& regs = cpu.registers();
+			regs.rax = 0;
+			cpu.set_registers(regs);
+		});
 	Machine::install_syscall_handler(
 		SYS_getuid, [](vCPU& cpu) { // GETUID
 			auto& regs = cpu.registers();
 			regs.rax = 0;
 			cpu.set_registers(regs);
 		});
+	Machine::install_syscall_handler(
+		SYS_geteuid, [](vCPU& cpu) { // GETEUID
+			auto& regs = cpu.registers();
+			regs.rax = 0;
+			cpu.set_registers(regs);
+		});
+	Machine::install_syscall_handler(
+		SYS_getegid, [](vCPU& cpu) { // GETEGID
+			auto& regs = cpu.registers();
+			regs.rax = 0;
+			cpu.set_registers(regs);
+		});
 	Machine::install_syscall_handler( // sched_getparam
 		SYS_sched_getparam, [](vCPU& cpu)
 		{