ladybird/Kernel/Syscalls/sysconf.cpp
Andrew Kaster b4a7d148b1 Kernel: Expose maximum argument limit in sysconf
Move the definitions for maximum argument and environment size to
Process.h from execve.cpp. This allows sysconf(_SC_ARG_MAX) to return
the actual argument maximum of 128 KiB to userspace.
2022-02-13 22:06:54 +02:00

44 lines
1.1 KiB
C++

/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <Kernel/FileSystem/VirtualFileSystem.h>
#include <Kernel/Process.h>
#include <Kernel/Time/TimeManagement.h>
namespace Kernel {
ErrorOr<FlatPtr> Process::sys$sysconf(int name)
{
VERIFY_NO_PROCESS_BIG_LOCK(this)
switch (name) {
case _SC_MONOTONIC_CLOCK:
return 1;
case _SC_NPROCESSORS_CONF:
case _SC_NPROCESSORS_ONLN:
return Processor::count();
case _SC_OPEN_MAX:
return OpenFileDescriptions::max_open();
case _SC_PAGESIZE:
return PAGE_SIZE;
case _SC_HOST_NAME_MAX:
return HOST_NAME_MAX;
case _SC_TTY_NAME_MAX:
return TTY_NAME_MAX;
case _SC_GETPW_R_SIZE_MAX:
return 4096; // idk
case _SC_CLK_TCK:
return TimeManagement::the().ticks_per_second();
case _SC_SYMLOOP_MAX:
return Kernel::VirtualFileSystem::symlink_recursion_limit;
case _SC_ARG_MAX:
return Process::max_arguments_size;
default:
return EINVAL;
}
}
}