mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-07 15:03:34 +00:00
18bb5888e1
- Remove PAGESIZE constant
- Fix realloc() documentation
- Fix ttyname_r() error reporting
- Make forking more reliable on Windows
- Make execvp() a few microseconds faster
- Make system() a few microseconds faster
- Tighten up the socket-related magic numbers
- Loosen restrictions on mmap() offset alignment
- Improve GetProgramExecutableName() with getenv("_")
- Use mkstemp() as basis for mktemp(), tmpfile(), tmpfd()
- Fix flakes in pthread_cancel_test, unix_test, fork_test
- Fix recently introduced futex stack overflow regression
- Let sockets be passed as stdio to subprocesses on Windows
- Improve security of bind() on Windows w/ SO_EXCLUSIVEADDRUSE
66 lines
3.4 KiB
C
66 lines
3.4 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 2023 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/mem/hook.internal.h"
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#include "libc/mem/mem.h"
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#include "third_party/dlmalloc/dlmalloc.h"
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void *(*hook_realloc)(void *, size_t) = dlrealloc;
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/**
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* Allocates / resizes / frees memory, e.g.
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*
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* Returns a pointer to a chunk of size n that contains the same data as
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* does chunk p up to the minimum of (n, p's size) bytes, or null if no
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* space is available.
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*
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* If p is NULL, then realloc() is equivalent to malloc().
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*
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* If p is not NULL and n is 0, then realloc() shrinks the allocation to
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* zero bytes. The allocation isn't freed and still continues to be a
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* uniquely allocated piece of memory. However it should be assumed that
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* zero bytes can be accessed, since that's enforced by `MODE=asan`.
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*
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* The returned pointer may or may not be the same as p. The algorithm
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* prefers extending p in most cases when possible, otherwise it employs
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* the equivalent of a malloc-copy-free sequence.
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*
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* Please note that p is NOT free()'d should realloc() fail, thus:
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*
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* if ((p2 = realloc(p, n2))) {
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* p = p2;
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* ...
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* } else {
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* ...
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* }
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*
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* if n is for fewer bytes than already held by p, the newly unused
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* space is lopped off and freed if possible.
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*
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* The old unix realloc convention of allowing the last-free'd chunk to
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* be used as an argument to realloc is not supported.
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*
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* @param p is address of current allocation or NULL
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* @param n is number of bytes needed
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* @return rax is result, or NULL w/ errno w/o free(p)
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* @see dlrealloc()
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* @threadsafe
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*/
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void *realloc(void *p, size_t n) {
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return hook_realloc(p, n);
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}
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