mirror of
https://github.com/FEX-Emu/FEX.git
synced 2026-10-10 17:00:19 +02:00
Ryan Houdek
98f0f22f41
Performance stats up front: This improves pressure-vessel startup time on my test device by 10.1% Improving the startup time from 9.71425 seconds to 8.7421 seconds. Most filesystem based syscalls support a file descriptor version with an *at suffix. This allows us to do these syscalls with pathnames that are relative to the directory FD that is passed to the syscall. This is pretty much exactly what we want when we are searching for files inside of our rootfs. The only quirk ends up being that we are getting passed absolute paths. This ends up being very simple to workaround by stripping off the front '/' character. Doing this is just offsetting the pointer passed to the syscall by one byte. This does require having two temporary buffers of size PATH_MAX passed to the handler since just like in the other implementation, we need to keep the previous result around. The difference being now that we aren't doing a bunch of std::string temporary manipulation and now we are returning one of the passed in buffers back depending on the result.
106 lines
3.3 KiB
C++
106 lines
3.3 KiB
C++
/*
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$info$
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tags: LinuxSyscalls|common
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$end_info$
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*/
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#pragma once
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#include <FEXCore/Config/Config.h>
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#include <cstdint>
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#include <fcntl.h>
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#include <functional>
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#include <map>
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#include <mutex>
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#include <linux/limits.h>
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#include <optional>
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#include <stddef.h>
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#include <string>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <vector>
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#include <unordered_map>
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#include <unordered_set>
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#include "Tests/LinuxSyscalls/EmulatedFiles/EmulatedFiles.h"
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namespace FEXCore::Context {
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class Context;
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}
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namespace FEX::HLE {
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[[maybe_unused]]
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static bool IsSymlink(int FD, const char *Filename) {
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// Checks to see if a filepath is a symlink.
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struct stat Buffer{};
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int Result = fstatat(FD, Filename, &Buffer, AT_SYMLINK_NOFOLLOW);
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return Result == 0 && S_ISLNK(Buffer.st_mode);
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}
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[[maybe_unused]]
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static ssize_t GetSymlink(int FD, const char *Filename, char *ResultBuffer, size_t ResultBufferSize) {
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return readlinkat(FD, Filename, ResultBuffer, ResultBufferSize);
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}
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struct open_how;
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class FileManager final {
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public:
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FileManager() = delete;
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FileManager(FileManager &&) = delete;
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FileManager(FEXCore::Context::Context *ctx);
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~FileManager();
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uint64_t Open(const char *pathname, int flags, uint32_t mode);
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uint64_t Close(int fd);
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uint64_t CloseRange(unsigned int first, unsigned int last, unsigned int flags);
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uint64_t Stat(const char *pathname, void *buf);
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uint64_t Lstat(const char *path, void *buf);
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uint64_t Access(const char *pathname, int mode);
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uint64_t FAccessat(int dirfd, const char *pathname, int mode);
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uint64_t FAccessat2(int dirfd, const char *pathname, int mode, int flags);
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uint64_t Readlink(const char *pathname, char *buf, size_t bufsiz);
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uint64_t Chmod(const char *pathname, mode_t mode);
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uint64_t Readlinkat(int dirfd, const char *pathname, char *buf, size_t bufsiz);
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uint64_t Openat(int dirfs, const char *pathname, int flags, uint32_t mode);
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uint64_t Openat2(int dirfs, const char *pathname, FEX::HLE::open_how *how, size_t usize);
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uint64_t Statx(int dirfd, const char *pathname, int flags, uint32_t mask, struct statx *statxbuf);
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uint64_t Mknod(const char *pathname, mode_t mode, dev_t dev);
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uint64_t NewFSStatAt(int dirfd, const char *pathname, struct stat *buf, int flag);
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uint64_t NewFSStatAt64(int dirfd, const char *pathname, struct stat64 *buf, int flag);
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// vfs
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uint64_t Statfs(const char *path, void *buf);
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std::string *FindFDName(int fd);
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std::optional<std::string> GetSelf(const char *Pathname);
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void UpdatePID(uint32_t PID) { CurrentPID = PID; }
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std::string GetEmulatedPath(const char *pathname, bool FollowSymlink = false);
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using FDPathTmpData = std::array<char[PATH_MAX], 2>;
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std::optional<std::pair<int, const char*>> GetEmulatedFDPath(const char *pathname, bool FollowSymlink, FDPathTmpData &TmpFilename);
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std::mutex *GetFDLock() { return &FDLock; }
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private:
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FEX::EmulatedFile::EmulatedFDManager EmuFD;
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std::mutex FDLock;
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std::map<uint32_t, std::string> FDToNameMap;
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std::map<std::string, std::string, std::less<>> ThunkOverlays;
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FEX_CONFIG_OPT(Filename, APP_FILENAME);
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FEX_CONFIG_OPT(LDPath, ROOTFS);
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FEX_CONFIG_OPT(ThunkGuestLibs, THUNKGUESTLIBS);
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FEX_CONFIG_OPT(ThunkGuestLibs32, THUNKGUESTLIBS32);
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FEX_CONFIG_OPT(ThunkConfig, THUNKCONFIG);
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FEX_CONFIG_OPT(AppConfigName, APP_CONFIG_NAME);
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FEX_CONFIG_OPT(Is64BitMode, IS64BIT_MODE);
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uint32_t CurrentPID{};
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int RootFSFD{AT_FDCWD};
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};
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}
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