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/*
* Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021, Kenneth Myhra <kennethmyhra@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/String.h>
#include <LibCore/System.h>
#include <LibSystem/syscall.h>
#include <fcntl.h>
#include <stdarg.h>
#include <sys/mman.h>
#include <unistd.h>
#define HANDLE_SYSCALL_RETURN_VALUE(syscall_name, rc, success_value) \
if ((rc) < 0) { \
return Error::from_syscall(syscall_name, rc); \
} \
return success_value;
namespace Core::System {
#ifdef __serenity__
ErrorOr<void> pledge(StringView promises, StringView execpromises)
{
Syscall::SC_pledge_params params {
{ promises.characters_without_null_termination(), promises.length() },
{ execpromises.characters_without_null_termination(), execpromises.length() },
};
int rc = syscall(SC_pledge, ¶ms);
HANDLE_SYSCALL_RETURN_VALUE("pledge"sv, rc, {});
}
ErrorOr<void> unveil(StringView path, StringView permissions)
{
Syscall::SC_unveil_params params {
{ path.characters_without_null_termination(), path.length() },
{ permissions.characters_without_null_termination(), permissions.length() },
};
int rc = syscall(SC_unveil, ¶ms);
HANDLE_SYSCALL_RETURN_VALUE("unveil"sv, rc, {});
}
ErrorOr<Array<int, 2>> pipe2(int flags)
{
Array<int, 2> fds;
if (::pipe2(fds.data(), flags) < 0)
return Error::from_syscall("pipe2"sv, -errno);
return fds;
}
#endif
ErrorOr<void> sigaction(int signal, struct sigaction const* action, struct sigaction* old_action)
{
if (::sigaction(signal, action, old_action) < 0)
return Error::from_syscall("sigaction"sv, -errno);
return {};
}
ErrorOr<struct stat> fstat(int fd)
{
struct stat st = {};
if (::fstat(fd, &st) < 0)
return Error::from_syscall("fstat"sv, -errno);
return st;
}
ErrorOr<int> fcntl(int fd, int command, ...)
{
va_list ap;
va_start(ap, command);
u32 extra_arg = va_arg(ap, u32);
int rc = ::fcntl(fd, command, extra_arg);
va_end(ap);
if (rc < 0)
return Error::from_syscall("fcntl"sv, -errno);
return rc;
}
ErrorOr<void*> mmap(void* address, size_t size, int protection, int flags, int fd, off_t offset, [[maybe_unused]] size_t alignment, [[maybe_unused]] StringView name)
{
#ifdef __serenity__
Syscall::SC_mmap_params params { (uintptr_t)address, size, alignment, protection, flags, fd, offset, { name.characters_without_null_termination(), name.length() } };
ptrdiff_t rc = syscall(SC_mmap, ¶ms);
if (rc < 0 && rc > -EMAXERRNO)
return Error::from_syscall("mmap"sv, rc);
return reinterpret_cast<void*>(rc);
#else
// NOTE: Regular POSIX mmap() doesn't support custom alignment requests.
VERIFY(!alignment);
auto* ptr = ::mmap(address, size, protection, flags, fd, offset);
if (ptr == MAP_FAILED)
return Error::from_syscall("mmap"sv, -errno);
return ptr;
#endif
}
ErrorOr<void> munmap(void* address, size_t size)
{
if (::munmap(address, size) < 0)
return Error::from_syscall("munmap"sv, -errno);
return {};
}
ErrorOr<int> open(StringView path, int options, ...)
{
if (!path.characters_without_null_termination())
return Error::from_syscall("open"sv, -EFAULT);
va_list ap;
va_start(ap, options);
auto mode = (mode_t)va_arg(ap, unsigned);
va_end(ap);
#ifdef __serenity__
Syscall::SC_open_params params { AT_FDCWD, { path.characters_without_null_termination(), path.length() }, options, mode };
int rc = syscall(SC_open, ¶ms);
HANDLE_SYSCALL_RETURN_VALUE("open"sv, rc, rc);
#else
// NOTE: We have to ensure that the path is null-terminated.
String path_string = path;
int rc = ::open(path_string.characters(), options, mode);
if (rc < 0)
return Error::from_syscall("open"sv, -errno);
return rc;
#endif
}
ErrorOr<void> close(int fd)
{
if (::close(fd) < 0)
return Error::from_syscall("close"sv, -errno);
return {};
}
ErrorOr<void> ftruncate(int fd, off_t length)
{
if (::ftruncate(fd, length) < 0)
return Error::from_syscall("ftruncate"sv, -errno);
return {};
}
ErrorOr<struct stat> stat(StringView path)
{
if (!path.characters_without_null_termination())
return Error::from_syscall("stat"sv, -EFAULT);
struct stat st = {};
#ifdef __serenity__
Syscall::SC_stat_params params { { path.characters_without_null_termination(), path.length() }, &st, AT_FDCWD, true };
int rc = syscall(SC_stat, ¶ms);
HANDLE_SYSCALL_RETURN_VALUE("stat"sv, rc, st);
#else
String path_string = path;
if (::stat(path_string.characters(), &st) < 0)
return Error::from_syscall("stat"sv, -errno);
return st;
#endif
}
ErrorOr<ssize_t> read(int fd, void* buffer, size_t buffer_size)
{
ssize_t rc = ::read(fd, buffer, buffer_size);
if (rc < 0)
return Error::from_syscall("read"sv, -errno);
return rc;
}
ErrorOr<ssize_t> write(int fd, void const* data, size_t data_size)
{
ssize_t rc = ::write(fd, data, data_size);
if (rc < 0)
return Error::from_syscall("write"sv, -errno);
return rc;
}
ErrorOr<void> kill(pid_t pid, int signal)
{
if (::kill(pid, signal) < 0)
return Error::from_syscall("kill"sv, -errno);
return {};
}
ErrorOr<int> dup2(int source_fd, int destination_fd)
{
int fd = ::dup2(source_fd, destination_fd);
if (fd < 0)
return Error::from_syscall("dup2"sv, -errno);
return fd;
}
ErrorOr<String> ptsname(int fd)
{
auto* name = ::ptsname(fd);
if (!name)
return Error::from_syscall("ptsname"sv, -errno);
return String(name);
}
ErrorOr<String> gethostname()
{
char hostname[256];
int rc = ::gethostname(hostname, sizeof(hostname));
if (rc < 0)
return Error::from_syscall("gethostname"sv, -errno);
return String(&hostname[0]);
}
}
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