epollsample.d

import core.sys.linux.epoll;
import std.stdio;
import core.stdc.errno;
import std.exception : errnoEnforce;

void main()
{
    epoll_event event;
    event.events = EPOLLIN;
    auto epfd = epoll_create1(EPOLL_CLOEXEC);
    if (epfd < 0)
        throw new Error("epfd == -1");

    auto rc = epoll_ctl(epfd, EPOLL_CTL_ADD, 0, &event);
    if (rc == -1)
        errnoEnforce(false, "epoll_ctl(2) failed");
}

log.txt

( ՞ਊ ՞) :~/dev/dlang $ cat epollsample.d 
import core.sys.linux.epoll;
import std.stdio;
import core.stdc.errno;
import std.exception : errnoEnforce;

void main()
{
    epoll_event event;
    event.events = EPOLLIN;
    auto epfd = epoll_create1(EPOLL_CLOEXEC);
    if (epfd < 0)
        throw new Error("epfd == -1");

    auto rc = epoll_ctl(epfd, EPOLL_CTL_ADD, 0, &event);
    if (rc == -1)
        errnoEnforce(false, "epoll_ctl(2) failed");
}
( ՞ਊ ՞) :~/dev/dlang $ dmd epollsample.d 
( ՞ਊ ՞) :~/dev/dlang $ echo foobar > /tmp/foobar
( ՞ਊ ՞) :~/dev/dlang $ ./epollsample < /tmp/foobar 
[email protected](16): epoll_ctl(2) failed (Operation not permitted)
----------------
??:? @safe bool std.exception.errnoEnforce!(bool, "epollsample.d", 16uL).errnoEnforce(bool, lazy immutable(char)[]) [0x985acc95]
??:? _Dmain [0x985acc10]
??:? _D2rt6dmain211_d_run_mainUiPPaPUAAaZiZ6runAllMFZ9__lambda1MFZv [0x985ad31f]
??:? void rt.dmain2._d_run_main(int, char**, extern (C) int function(char[][])*).tryExec(scope void delegate()) [0x985ad24b]
??:? void rt.dmain2._d_run_main(int, char**, extern (C) int function(char[][])*).runAll() [0x985ad2c4]
??:? void rt.dmain2._d_run_main(int, char**, extern (C) int function(char[][])*).tryExec(scope void delegate()) [0x985ad24b]
??:? _d_run_main [0x985ad1af]
??:? main [0x985acd2f]
??:? __libc_start_main [0x7d75b3f0]