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LibCore/System: Add anon_create syscall wrapper

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This wrapper is particularly helpful as we use a combination of similar
syscalls on Linux to simulate the behavior of the Serenity-exclusive
anon_create syscall. Users therefore won't have to worry about the
platform anymore :^)
This commit is contained in:
kleines Filmröllchen 2022-01-23 23:03:09 +01:00 • committed by Andreas Kling
parent 05eb68d452
commit cf1f58d51c
2 changed files with 34 additions and 0 deletions
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33
Userland/Libraries/LibCore/System.cpp
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@ -7,6 +7,7 @@
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/StdLibExtras.h>
#include <AK/String.h>
#include <AK/Vector.h>
#include <LibCore/System.h>
@ -24,6 +25,16 @@
# include <serenity.h>
#endif
#if defined(__linux__) && !defined(MFD_CLOEXEC)
# include <linux/memfd.h>
# include <sys/syscall.h>
static int memfd_create(const char* name, unsigned int flags)
{
return syscall(SYS_memfd_create, name, flags);
}
#endif
#define HANDLE_SYSCALL_RETURN_VALUE(syscall_name, rc, success_value) \
if ((rc) < 0) { \
return Error::from_syscall(syscall_name, rc); \
@ -245,6 +256,28 @@ ErrorOr<void> munmap(void* address, size_t size)
return {};
}
ErrorOr<int> anon_create([[maybe_unused]] size_t size, [[maybe_unused]] int options)
{
int fd = -1;
#if defined(__serenity__)
fd = ::anon_create(round_up_to_power_of_two(size, PAGE_SIZE), options);
#elif defined(__linux__)
// FIXME: Support more options on Linux.
auto linux_options = ((options & O_CLOEXEC) > 0) ? MFD_CLOEXEC : 0;
fd = memfd_create("", linux_options);
if (fd < 0)
return Error::from_errno(errno);
if (::ftruncate(fd, size) < 0) {
auto saved_errno = errno;
TRY(close(fd));
return Error::from_errno(saved_errno);
}
#endif
if (fd < 0)
return Error::from_errno(errno);
return fd;
}
ErrorOr<int> open(StringView path, int options, ...)
{
if (!path.characters_without_null_termination())