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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, Bytes buffer)
- {
- ssize_t rc = ::read(fd, buffer.data(), buffer.size());
- if (rc < 0)
- return Error::from_syscall("read"sv, -errno);
- return rc;
- }
- ErrorOr<ssize_t> write(int fd, ReadonlyBytes buffer)
- {
- ssize_t rc = ::write(fd, buffer.data(), buffer.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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