mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-07 23:13:34 +00:00
046c7ebd4a
- Introduce fast spinlock API - Double rand64() perf w/ spinlock - Improve raise() on New Technology - Support gettid() across platforms - Implement SA_NODEFER on New Technology - Move the lock intrinsics into LIBC_INTRIN - Make SIGTRAP recoverable on New Technology - Block SIGCHLD in wait4() on New Technology - Add threading prototypes for XNU and FreeBSD - Rewrite abort() fixing its minor bugs on XNU/NT - Shave down a lot of the content in libc/bits/bits.h - Let signal handlers modify CPU registers on New Technology
63 lines
2.8 KiB
C
63 lines
2.8 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/assert.h"
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#include "libc/bits/weaken.h"
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#include "libc/calls/internal.h"
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#include "libc/intrin/cmpxchg.h"
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#include "libc/mem/mem.h"
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#include "libc/str/str.h"
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#include "libc/sysv/errfuns.h"
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static void __ensurefds_destroy(void) {
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weaken(free)(g_fds.p);
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}
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int __ensurefds(int fd) {
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size_t n1, n2;
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struct Fd *p1, *p2;
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for (;;) {
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p1 = g_fds.p;
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n1 = g_fds.n;
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if (fd < n1) return fd;
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if (weaken(malloc)) {
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n2 = MAX(fd + 1, n1 + (n1 << 1));
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if ((p2 = weaken(malloc)(n2 * sizeof(*p1)))) {
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memcpy(p2, p1, n1 * sizeof(*p1));
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bzero(p2 + n1, (n2 - n1) * sizeof(*p1));
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if (_cmpxchg(&g_fds.p, p1, p2)) {
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g_fds.n = n2;
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if (weaken(free)) {
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if (p1 == g_fds.__init_p) {
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atexit(__ensurefds_destroy);
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} else {
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weaken(free)(p1);
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}
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}
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return fd;
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} else if (weaken(free)) {
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weaken(free)(p2);
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}
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} else {
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return enomem();
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}
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} else {
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return emfile();
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}
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}
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}
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