mirror of
https://github.com/jart/cosmopolitan.git
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2b6261a52d
- Fix minor ABI issue with SIOCGIFCONF - Fix ABI translation issues with statfs() on BSDs - Fix SQLite angled header line
56 lines
2.9 KiB
C
56 lines
2.9 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 2022 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/calls/calls.h"
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#include "libc/dce.h"
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#include "libc/str/blake2.h"
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#include "libc/str/path.h"
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#include "libc/str/str.h"
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#include "libc/sysv/errfuns.h"
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#include "libc/thread/thread.h"
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/**
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* Returns filesystem pathname of named semaphore.
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*
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* @param name is `name` of semaphore which should begin with slash
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* @param buf is temporary storage with at least `size` bytes
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* @param size is size of `buf` in bytes
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* @return pointer to file system path
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* @raise ENAMETOOLONG if constructed path would exceed `size`
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*/
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const char *sem_path_np(const char *name, char *buf, size_t size) {
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char *p;
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unsigned n;
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const char *path, *a;
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uint8_t digest[BLAKE2B256_DIGEST_LENGTH];
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a = "/tmp/", n = 5;
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if (IsLinux() && isdirectory("/dev/shm")) {
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a = "/dev/shm/", n = 9;
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}
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if (n + BLAKE2B256_DIGEST_LENGTH * 2 + 4 < size) {
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BLAKE2B256(name, strlen(name), digest);
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p = mempcpy(buf, a, n);
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p = hexpcpy(p, digest, BLAKE2B256_DIGEST_LENGTH);
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p = mempcpy(p, ".sem", 5);
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path = buf;
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} else {
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enametoolong();
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path = 0;
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}
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return path;
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}
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