Function fchown [src]

Changes the owner and group of the file referred to by the file descriptor. The process must have the correct privileges in order to do this successfully. The group may be changed by the owner of the directory to any group of which the owner is a member. If the owner or group is specified as null, the ID is not changed.

Prototype

pub fn fchown(fd: fd_t, owner: ?uid_t, group: ?gid_t) FChownError!void

Parameters

fd: fd_towner: ?uid_tgroup: ?gid_t

Possible Errors

AccessDenied

FileNotFound

InputOutput

PermissionDenied

ReadOnlyFileSystem

SymLinkLoop

SystemResources

Unexpected UnexpectedError

The Operating System returned an undocumented error code.

This error is in theory not possible, but it would be better to handle this error than to invoke undefined behavior.

When this error code is observed, it usually means the Zig Standard Library needs a small patch to add the error code to the error set for the respective function.

Source

  pub fn fchown(fd: fd_t, owner: ?uid_t, group: ?gid_t) FChownError!void {
    switch (native_os) {
        .windows, .wasi => @compileError("Unsupported OS"),
        else => {},
    }

    while (true) {
        const res = system.fchown(fd, owner orelse ~@as(uid_t, 0), group orelse ~@as(gid_t, 0));

        switch (errno(res)) {
            .SUCCESS => return,
            .INTR => continue,
            .BADF => unreachable, // Can be reached if the fd refers to a directory opened without `Dir.OpenOptions{ .iterate = true }`

            .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.PermissionDenied,
            .ROFS => return error.ReadOnlyFileSystem,
            else => |err| return unexpectedErrno(err),
        }
    }
}  