Function sysctl [src]

Prototype

 pub fn sysctl( name: []const c_int, oldp: ?*anyopaque, oldlenp: ?*usize, newp: ?*anyopaque, newlen: usize, ) SysCtlError!void

Parameters

name: []const c_intoldp: ?*anyopaqueoldlenp: ?*usizenewp: ?*anyopaquenewlen: usize

Possible Errors

NameTooLong

PermissionDenied

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.

UnknownName

Source

  pub fn sysctl(
    name: []const c_int,
    oldp: ?*anyopaque,
    oldlenp: ?*usize,
    newp: ?*anyopaque,
    newlen: usize,
) SysCtlError!void {
    if (native_os == .wasi) {
        @compileError("sysctl not supported on WASI");
    }
    if (native_os == .haiku) {
        @compileError("sysctl not supported on Haiku");
    }

    const name_len = cast(c_uint, name.len) orelse return error.NameTooLong;
    switch (errno(system.sysctl(name.ptr, name_len, oldp, oldlenp, newp, newlen))) {
        .SUCCESS => return,
        .FAULT => unreachable,
        .PERM => return error.PermissionDenied,
        .NOMEM => return error.SystemResources,
        .NOENT => return error.UnknownName,
        else => |err| return unexpectedErrno(err),
    }
}  