Function prctl [src]

Prototype

pub fn prctl(option: PR, args: anytype) PrctlError!u31

Parameters

option: PR

Possible Errors

AccessDenied

Can only occur with PR_SET_SECCOMP/SECCOMP_MODE_FILTER or PR_SET_MM/PR_SET_MM_EXE_FILE

InvalidAddress

InvalidFileDescriptor

Can only occur with PR_SET_MM/PR_SET_MM_EXE_FILE

OperationNotSupported

Can only occur with PR_SET_FP_MODE

PermissionDenied

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.

UnsupportedFeature

Can only occur with PR_SET_SPECULATION_CTRL, PR_MPX_ENABLE_MANAGEMENT, or PR_MPX_DISABLE_MANAGEMENT

Source

  pub fn prctl(option: PR, args: anytype) PrctlError!u31 {
    if (@typeInfo(@TypeOf(args)) != .@"struct")
        @compileError("Expected tuple or struct argument, found " ++ @typeName(@TypeOf(args)));
    if (args.len > 4)
        @compileError("prctl takes a maximum of 4 optional arguments");

    var buf: [4]usize = undefined;
    {
        comptime var i = 0;
        inline while (i < args.len) : (i += 1) buf[i] = args[i];
    }

    const rc = system.prctl(@intFromEnum(option), buf[0], buf[1], buf[2], buf[3]);
    switch (errno(rc)) {
        .SUCCESS => return @intCast(rc),
        .ACCES => return error.AccessDenied,
        .BADF => return error.InvalidFileDescriptor,
        .FAULT => return error.InvalidAddress,
        .INVAL => unreachable,
        .NODEV, .NXIO => return error.UnsupportedFeature,
        .OPNOTSUPP => return error.OperationNotSupported,
        .PERM, .BUSY => return error.PermissionDenied,
        .RANGE => unreachable,
        else => |err| return unexpectedErrno(err),
    }
}  