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| author | Tobias Bucher <tobiasbucher5991@gmail.com> | 2024-05-13 20:32:33 +0200 |
|---|---|---|
| committer | Tobias Bucher <tobiasbucher5991@gmail.com> | 2025-06-05 16:27:27 +0200 |
| commit | fde8a8d518e3bd9124bfe4028e3c45f7dcf34593 (patch) | |
| tree | ddf690f43ec8dce6e563fe6769a28edc7d8913ec /library/std/src/sys/pal | |
| parent | c360e219f5a56631baa46065d28e9852ca7d4ce3 (diff) | |
| download | rust-fde8a8d518e3bd9124bfe4028e3c45f7dcf34593.tar.gz rust-fde8a8d518e3bd9124bfe4028e3c45f7dcf34593.zip | |
Optimize `Seek::stream_len` impl for `File`
It uses the file metadata on Unix with a fallback for files incorrectly reported as zero-sized. It uses `GetFileSizeEx` on Windows. This reduces the number of syscalls needed for determining the file size of an open file from 3 to 1.
Diffstat (limited to 'library/std/src/sys/pal')
| -rw-r--r-- | library/std/src/sys/pal/windows/c/bindings.txt | 1 | ||||
| -rw-r--r-- | library/std/src/sys/pal/windows/c/windows_sys.rs | 1 |
2 files changed, 2 insertions, 0 deletions
diff --git a/library/std/src/sys/pal/windows/c/bindings.txt b/library/std/src/sys/pal/windows/c/bindings.txt index d5fbb453c6f..a99c474c763 100644 --- a/library/std/src/sys/pal/windows/c/bindings.txt +++ b/library/std/src/sys/pal/windows/c/bindings.txt @@ -2156,6 +2156,7 @@ GetExitCodeProcess GetFileAttributesW GetFileInformationByHandle GetFileInformationByHandleEx +GetFileSizeEx GetFileType GETFINALPATHNAMEBYHANDLE_FLAGS GetFinalPathNameByHandleW diff --git a/library/std/src/sys/pal/windows/c/windows_sys.rs b/library/std/src/sys/pal/windows/c/windows_sys.rs index eb2914b8644..95bf8040229 100644 --- a/library/std/src/sys/pal/windows/c/windows_sys.rs +++ b/library/std/src/sys/pal/windows/c/windows_sys.rs @@ -44,6 +44,7 @@ windows_targets::link!("kernel32.dll" "system" fn GetExitCodeProcess(hprocess : windows_targets::link!("kernel32.dll" "system" fn GetFileAttributesW(lpfilename : PCWSTR) -> u32); windows_targets::link!("kernel32.dll" "system" fn GetFileInformationByHandle(hfile : HANDLE, lpfileinformation : *mut BY_HANDLE_FILE_INFORMATION) -> BOOL); windows_targets::link!("kernel32.dll" "system" fn GetFileInformationByHandleEx(hfile : HANDLE, fileinformationclass : FILE_INFO_BY_HANDLE_CLASS, lpfileinformation : *mut core::ffi::c_void, dwbuffersize : u32) -> BOOL); +windows_targets::link!("kernel32.dll" "system" fn GetFileSizeEx(hfile : HANDLE, lpfilesize : *mut i64) -> BOOL); windows_targets::link!("kernel32.dll" "system" fn GetFileType(hfile : HANDLE) -> FILE_TYPE); windows_targets::link!("kernel32.dll" "system" fn GetFinalPathNameByHandleW(hfile : HANDLE, lpszfilepath : PWSTR, cchfilepath : u32, dwflags : GETFINALPATHNAMEBYHANDLE_FLAGS) -> u32); windows_targets::link!("kernel32.dll" "system" fn GetFullPathNameW(lpfilename : PCWSTR, nbufferlength : u32, lpbuffer : PWSTR, lpfilepart : *mut PWSTR) -> u32); |