mirror of
https://github.com/jart/cosmopolitan.git
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a359de7893
This changes *NSYNC to allocate waiters on the stack so our locks don't need to depend on dynamic memory. This make our runtiem simpler, and it also fixes bugs with thread cancellation support.
109 lines
3.6 KiB
C
109 lines
3.6 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/intrin/getenv.internal.h"
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#include "libc/intrin/leaky.internal.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/intrin/weaken.h"
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#include "libc/macros.internal.h"
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#include "libc/mem/internal.h"
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#include "libc/mem/mem.h"
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#include "libc/runtime/runtime.h"
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#include "libc/sysv/errfuns.h"
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#define ToUpper(c) ((c) >= 'a' && (c) <= 'z' ? (c) - 'a' + 'A' : (c))
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static char **expected;
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static size_t capacity;
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static size_t GetEnvironLen(char **env) {
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char **p = env;
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while (*p) ++p;
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return p - env;
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}
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static char **GrowEnviron(char **a) {
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size_t n, c;
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char **b, **p;
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if (!a) a = environ;
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n = a ? GetEnvironLen(a) : 0;
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c = MAX(16ul, n) << 1;
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if (_weaken(malloc) && (b = _weaken(malloc)(c * sizeof(char *)))) {
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if (a) {
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for (p = b; *a;) {
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*p++ = *a++;
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}
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}
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environ = b;
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expected = b;
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capacity = c;
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return b;
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} else {
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enomem();
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return 0;
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}
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}
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IGNORE_LEAKS(GrowEnviron)
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int PutEnvImpl(char *s, bool overwrite) {
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char **p;
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struct Env e;
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if (!(p = environ)) {
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if (!(p = GrowEnviron(0))) {
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return -1;
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}
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}
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e = __getenv(p, s);
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if (e.s && !overwrite) {
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return 0;
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}
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if (e.s) {
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p[e.i] = s;
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return 0;
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}
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if (p != expected) {
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capacity = e.i;
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}
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if (e.i + 1 >= capacity) {
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if (!(p = GrowEnviron(p))) {
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return -1;
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}
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}
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p[e.i + 1] = 0;
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p[e.i] = s;
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return 0;
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}
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/**
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* Emplaces environment key=value.
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*
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* @param s should be a string that looks like `"name=value"` and it'll
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* become part of the environment; changes to its memory will change
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* the environment too
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* @return 0 on success, or non-zero w/ errno on error
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* @raise ENOMEM if we require more vespene gas
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* @see setenv(), getenv()
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* @threadunsafe
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*/
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int putenv(char *s) {
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int rc;
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rc = PutEnvImpl(s, true);
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STRACE("putenv(%#s) → %d% m", s, rc);
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return rc;
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}
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