Function sysctlbynameZ [src]

Prototype

 pub fn sysctlbynameZ( name: [*:0]const u8, oldp: ?*anyopaque, oldlenp: ?*usize, newp: ?*anyopaque, newlen: usize, ) SysCtlError!void

Parameters

name: [*:0]const u8oldp: ?*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 sysctlbynameZ(
    name: [*:0]const u8,
    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");
    }

    switch (errno(system.sysctlbyname(name, 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),
    }
}  