Function ppoll [src]

Prototype

pub fn ppoll(fds: []pollfd, timeout: ?*const timespec, mask: ?*const sigset_t) PPollError!usize

Parameters

fds: []pollfdtimeout: ?*const timespecmask: ?*const sigset_t

Possible Errors

SignalInterrupt

The operation was interrupted by a delivery of a signal before it could complete.

SystemResources

The kernel had no space to allocate file descriptor tables.

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 ppoll(fds: []pollfd, timeout: ?*const timespec, mask: ?*const sigset_t) PPollError!usize {
    var ts: timespec = undefined;
    var ts_ptr: ?*timespec = null;
    if (timeout) |timeout_ns| {
        ts_ptr = &ts;
        ts = timeout_ns.*;
    }
    const fds_count = cast(nfds_t, fds.len) orelse return error.SystemResources;
    const rc = system.ppoll(fds.ptr, fds_count, ts_ptr, mask);
    switch (errno(rc)) {
        .SUCCESS => return @intCast(rc),
        .FAULT => unreachable,
        .INTR => return error.SignalInterrupt,
        .INVAL => unreachable,
        .NOMEM => return error.SystemResources,
        else => |err| return unexpectedErrno(err),
    }
}  