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Annotation of nono/lib/kevent.h, revision 1.1.1.3

1.1       root        1: //
                      2: // nono
                      3: // Copyright (C) 2021 nono project
                      4: // Licensed under nono-license.txt
                      5: //
                      6: 
1.1.1.2   root        7: //
                      8: // kqueue/kevent をいろいろ便利にする
                      9: //
                     10: 
1.1       root       11: #pragma once
                     12: 
1.1.1.2   root       13: #include "header.h"
                     14: 
1.1       root       15: #include <sys/types.h>
                     16: #if defined(HAVE_SYS_EVENT_H)
                     17: #include <sys/event.h>
                     18: #endif
                     19: #if defined(HAVE_KQUEUE_SYS_EVENT_H)
                     20: #include <kqueue/sys/event.h>
                     21: #endif
                     22: #include <sys/time.h>
                     23: 
                     24: // udata の型は環境によって異なる
                     25: using kevent_udata_t = decltype(kevent::udata);
                     26: 
1.1.1.2   root       27: // udata と int の相互変換
                     28: static inline kevent_udata_t
                     29: EV_INT2UDATA(int x)
                     30: {
                     31:        return (kevent_udata_t)(intptr_t)x;
                     32: }
                     33: static inline int
                     34: EV_UDATA2INT(kevent_udata_t x)
                     35: {
                     36:        return (int)(intptr_t)x;
                     37: }
                     38: 
1.1       root       39: #define kevent_set(k, e, n)            kevent((k), (e), (n), NULL, 0, NULL)
                     40: #define kevent_poll(k, e, n, t)        kevent((k), NULL, 0, (e), (n), (t))
1.1.1.2   root       41: 
                     42: static inline int
                     43: kevent_add(int kq, int fd, int filter, int action, int udata)
                     44: {
                     45:        struct kevent kev;
1.1.1.3 ! root       46:        int r;
1.1.1.2   root       47: 
                     48:        EV_SET(&kev, fd, filter, action, 0, 0, EV_INT2UDATA(udata));
1.1.1.3 ! root       49:        r = kevent_set(kq, &kev, 1);
        !            50: #if defined(__linux__)
        !            51:        // libkqueue は負数を返すけど errno == 0 ということがあり、
        !            52:        // どういうことか分からないけど、とりあえず正常扱いしておく。
        !            53:        if (r < 0 && errno == 0) {
        !            54:                r = 0;
        !            55:        }
        !            56: #endif
        !            57:        return r;
1.1.1.2   root       58: }

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