mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 11:37:35 +00:00
36 lines
2.3 KiB
C
36 lines
2.3 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2021 Justine Alexandra Roberts Tunney │
|
|
│ │
|
|
│ Permission to use, copy, modify, and/or distribute this software for │
|
|
│ any purpose with or without fee is hereby granted, provided that the │
|
|
│ above copyright notice and this permission notice appear in all copies. │
|
|
│ │
|
|
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
|
|
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
|
|
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
|
|
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
|
|
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
|
|
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
|
|
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
|
|
│ PERFORMANCE OF THIS SOFTWARE. │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/calls/internal.h"
|
|
#include "libc/intrin/atomic.h"
|
|
#include "libc/macros.h"
|
|
#include "libc/str/str.h"
|
|
|
|
// really want to avoid locking here so close() needn't block signals
|
|
void __releasefd(int fd) {
|
|
int f1, f2;
|
|
if (!(0 <= fd && fd < g_fds.n))
|
|
return;
|
|
g_fds.p[fd].kind = kFdEmpty;
|
|
bzero(g_fds.p + fd, sizeof(*g_fds.p));
|
|
f1 = atomic_load_explicit(&g_fds.f, memory_order_relaxed);
|
|
do {
|
|
f2 = MIN(fd, f1);
|
|
} while (!atomic_compare_exchange_weak_explicit(
|
|
&g_fds.f, &f1, f2, memory_order_release, memory_order_relaxed));
|
|
}
|