mirror of
https://github.com/jart/cosmopolitan.git
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102 lines
4.3 KiB
C
102 lines
4.3 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/bits/safemacros.internal.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/sigbits.h"
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#include "libc/calls/struct/stat.h"
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#include "libc/errno.h"
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#include "libc/limits.h"
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#include "libc/log/libfatal.internal.h"
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#include "libc/macros.internal.h"
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#include "libc/mem/alloca.h"
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#include "libc/runtime/runtime.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/auxv.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/sysv/consts/sig.h"
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#include "libc/zip.h"
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#include "libc/zipos/zipos.internal.h"
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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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*/
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struct Zipos *__zipos_get(void) {
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static bool once;
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static struct Zipos zipos;
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int fd;
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char *path;
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size_t size;
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sigset_t neu, old;
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uint8_t *map, *base, *cdir;
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if (!once) {
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sigfillset(&neu);
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sigprocmask(SIG_BLOCK, &neu, &old);
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if ((fd = open(program_executable_name, O_RDONLY)) != -1) {
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if ((size = getfiledescriptorsize(fd)) != SIZE_MAX &&
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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 = GetZipCdir(base, size))) {
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__zipos_munmap_unneeded(base, cdir, map);
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zipos.map = base;
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zipos.cdir = cdir;
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} else {
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munmap(map, size);
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ZTRACE("__zipos_get(%s) → eocd not found", program_executable_name);
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}
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} else {
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ZTRACE("__zipos_get(%s) → stat/mmap %s", program_executable_name,
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strerror(errno));
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}
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close(fd);
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} else {
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ZTRACE("__zipos_get(%s) → open %s", program_executable_name,
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strerror(errno));
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}
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once = true;
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sigprocmask(SIG_SETMASK, &old, 0);
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}
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return zipos.cdir ? &zipos : 0;
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}
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