move over 1 minimal used function to CI test things.

Author: Jan Philipp Hafer

lib/std/fs/file.zig

@@ -393,14 +393,14 @@ pub const File = struct {
         return Stat.fromSystem(st);
     }
 
-    pub const ChmodError = std.os.FChmodError;
+    pub const ChmodError = std.os.posix.FChmodError;
 
     /// Changes the mode of the file.
     /// The process must have the correct privileges in order to do this
     /// successfully, or must have the effective user ID matching the owner
     /// of the file.
     pub fn chmod(self: File, new_mode: Mode) ChmodError!void {
-        try os.fchmod(self.handle, new_mode);
+        try os.posix.fchmod(self.handle, new_mode);
     }
 
     pub const ChownError = std.os.FChownError;

lib/std/os.zig

@@ -40,6 +40,7 @@ pub const uefi = @import("os/uefi.zig");
 pub const wasi = @import("os/wasi.zig");
 pub const windows = @import("os/windows.zig");
 
+pub const posix = @import("os/posix.zig"); // posix
 pub const posix_spawn = @import("os/posix_spawn.zig"); // posix
 pub const ptrace = @import("os/ptrace.zig"); // posix
 pub const dragonfly = std.c;
@@ -62,6 +63,8 @@ test {
     if (builtin.os.tag == .uefi) {
         _ = uefi;
     }
+
+    _ = posix;
 }
 
 /// Applications can override the `system` API layer in their root source file.
@@ -291,46 +294,6 @@ pub fn close(fd: fd_t) void {
     }
 }
 
-pub const FChmodError = error{
-    AccessDenied,
-    InputOutput,
-    SymLinkLoop,
-    FileNotFound,
-    SystemResources,
-    ReadOnlyFileSystem,
-} || UnexpectedError;
-
-/// Changes the mode of the file referred to by the file descriptor.
-/// The process must have the correct privileges in order to do this
-/// successfully, or must have the effective user ID matching the owner
-/// of the file.
-pub fn fchmod(fd: fd_t, mode: mode_t) FChmodError!void {
-    if (builtin.os.tag == .windows or builtin.os.tag == .wasi)
-        @compileError("Unsupported OS");
-
-    while (true) {
-        const res = system.fchmod(fd, mode);
-
-        switch (system.getErrno(res)) {
-            .SUCCESS => return,
-            .INTR => continue,
-            .BADF => unreachable, // Can be reached if the fd refers to a non-iterable directory.
-
-            .FAULT => unreachable,
-            .INVAL => unreachable,
-            .ACCES => return error.AccessDenied,
-            .IO => return error.InputOutput,
-            .LOOP => return error.SymLinkLoop,
-            .NOENT => return error.FileNotFound,
-            .NOMEM => return error.SystemResources,
-            .NOTDIR => return error.FileNotFound,
-            .PERM => return error.AccessDenied,
-            .ROFS => return error.ReadOnlyFileSystem,
-            else => |err| return unexpectedErrno(err),
-        }
-    }
-}
-
 pub const FChownError = error{
     AccessDenied,
     InputOutput,

lib/std/os/posix.zig

@@ -0,0 +1,55 @@
+//! This file contains posix abstractions and wrappers around
+//! OS-specific APIs for conforming platforms, whether libc is or is not linked.
+//! APIs defined here can not have comparable semantics on Windows.
+
+const std = @import("std");
+const builtin = @import("builtin");
+const os = std.os;
+
+// Constants
+const UnexpectedError = os.UnexpectedError;
+const fd_t = os.fd_t;
+const mode_t = os.mode_t;
+const system = os.system;
+// Functions
+const unexpectedErrno = os.unexpectedErrno;
+
+pub const FChmodError = error{
+    AccessDenied,
+    InputOutput,
+    SymLinkLoop,
+    FileNotFound,
+    SystemResources,
+    ReadOnlyFileSystem,
+} || UnexpectedError;
+
+/// Changes the mode of the file referred to by the file descriptor.
+/// The process must have the correct privileges in order to do this
+/// successfully, or must have the effective user ID matching the owner
+/// of the file.
+pub fn fchmod(fd: fd_t, mode: mode_t) FChmodError!void {
+    if (builtin.os.tag == .windows or builtin.os.tag == .wasi)
+        @compileError("Unsupported OS");
+
+    while (true) {
+        const res = system.fchmod(fd, mode);
+
+        switch (system.getErrno(res)) {
+            .SUCCESS => return,
+            .INTR => continue,
+            .BADF => unreachable, // Can be reached if the fd refers to a non-iterable directory.
+
+            .FAULT => unreachable,
+            .INVAL => unreachable,
+            .ACCES => return error.AccessDenied,
+            .IO => return error.InputOutput,
+            .LOOP => return error.SymLinkLoop,
+            .NOENT => return error.FileNotFound,
+            .NOMEM => return error.SystemResources,
+            .NOTDIR => return error.FileNotFound,
+            .PERM => return error.AccessDenied,
+            .ROFS => return error.ReadOnlyFileSystem,
+            else => |err| return unexpectedErrno(err),
+        }
+    }
+}