mirror of
https://github.com/jart/cosmopolitan.git
synced 2024-05-18 03:22:40 +00:00
4a59210008
This change improves the way internal APIs are being hidden behind the `COSMO` define. The cosmo.h header will take care of defining that, so that a separate define statement isn't needed. This change also does a lot more to define which APIs are standard, and which belong to Cosmo.
118 lines
4.4 KiB
C
118 lines
4.4 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 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/calls/calls.h"
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#include "libc/calls/metalfile.internal.h"
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#include "libc/fmt/conv.h"
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#include "libc/intrin/cmpxchg.h"
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#include "libc/intrin/promises.internal.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/macros.internal.h"
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#include "libc/runtime/runtime.h"
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#include "libc/sysv/consts/map.h"
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#include "libc/sysv/consts/o.h"
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#include "libc/sysv/consts/prot.h"
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#include "libc/thread/thread.h"
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#include "libc/zip.internal.h"
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#include "libc/zipos/zipos.internal.h"
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#ifdef __x86_64__
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STATIC_YOINK(APE_COM_NAME);
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#endif
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static uint64_t __zipos_get_min_offset(const uint8_t *base,
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const uint8_t *cdir) {
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uint64_t i, n, c, r, o;
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c = GetZipCdirOffset(cdir);
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n = GetZipCdirRecords(cdir);
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for (r = c, i = 0; i < n; ++i, c += ZIP_CFILE_HDRSIZE(base + c)) {
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o = GetZipCfileOffset(base + c);
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if (o < r) r = o;
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}
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return r;
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}
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static void __zipos_munmap_unneeded(const uint8_t *base, const uint8_t *cdir,
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const uint8_t *map) {
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uint64_t n;
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n = __zipos_get_min_offset(base, cdir);
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n += base - map;
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n = ROUNDDOWN(n, FRAMESIZE);
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if (n) munmap(map, n);
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}
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/**
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* Returns pointer to zip central directory of current executable.
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* @asyncsignalsafe
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* @threadsafe
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*/
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struct Zipos *__zipos_get(void) {
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int fd = -1;
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ssize_t size;
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int err, msg;
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static bool once;
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struct Zipos *res;
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const char *progpath;
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static struct Zipos zipos;
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uint8_t *map, *base, *cdir;
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progpath = getenv("COSMOPOLITAN_INIT_ZIPOS");
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if (progpath) {
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fd = atoi(progpath);
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}
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if (!once && ((fd != -1) || PLEDGED(RPATH))) {
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__zipos_lock();
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if (fd == -1) {
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progpath = GetProgramExecutableName();
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fd = open(progpath, O_RDONLY);
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}
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if (fd != -1) {
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if ((size = lseek(fd, 0, SEEK_END)) != -1 &&
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(map = mmap(0, size, PROT_READ, MAP_SHARED, fd, 0)) != MAP_FAILED) {
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if ((base = FindEmbeddedApe(map, size))) {
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size -= base - map;
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} else {
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base = map;
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}
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if ((cdir = GetZipEocd(base, size, &err)) &&
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_cmpxchg(&zipos.map, 0, base)) {
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__zipos_munmap_unneeded(base, cdir, map);
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zipos.cdir = cdir;
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msg = kZipOk;
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} else {
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munmap(map, size);
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msg = !cdir ? err : kZipErrorRaceCondition;
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}
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} else {
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msg = kZipErrorMapFailed;
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}
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close(fd);
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} else {
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msg = kZipErrorOpenFailed;
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}
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once = true;
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__zipos_unlock();
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STRACE("__zipos_get(%#s) → %d% m", progpath, msg);
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}
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if (zipos.cdir) {
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res = &zipos;
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} else {
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res = 0;
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}
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return res;
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}
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