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Move zipos into runtime package
This way complex runtime features (e.g. ftrace, symbol tables) can always yoink zipos support. This is important now that apelink.com automates embedding symbol tables for multiple cpus.
This commit is contained in:
Justine Tunney
parent
d53c335a45
commit
e11fa30791
90 changed files with 133 additions and 289 deletions
222
libc/runtime/zipos-open.c
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222
libc/runtime/zipos-open.c
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/*-*- 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/assert.h"
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#include "libc/calls/blocksigs.internal.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/internal.h"
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#include "libc/calls/state.internal.h"
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#include "libc/calls/struct/sigset.h"
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#include "libc/calls/syscall-sysv.internal.h"
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/intrin/asan.internal.h"
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#include "libc/intrin/atomic.h"
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#include "libc/intrin/cmpxchg.h"
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#include "libc/intrin/directmap.internal.h"
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#include "libc/intrin/extend.internal.h"
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#include "libc/intrin/weaken.h"
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#include "libc/runtime/internal.h"
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#include "libc/runtime/memtrack.internal.h"
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#include "libc/sysv/consts/f.h"
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#include "libc/sysv/consts/fd.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/sysv/errfuns.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/runtime/zipos.internal.h"
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static char *mapend;
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static size_t maptotal;
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static void *__zipos_mmap_space(size_t mapsize) {
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char *start;
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size_t offset;
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unassert(mapsize);
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offset = maptotal;
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maptotal += mapsize;
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start = (char *)kMemtrackZiposStart;
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if (!mapend) mapend = start;
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mapend = _extend(start, maptotal, mapend, MAP_PRIVATE,
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kMemtrackZiposStart + kMemtrackZiposSize);
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return start + offset;
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}
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static struct ZiposHandle *__zipos_alloc(struct Zipos *zipos, size_t size) {
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size_t mapsize;
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struct ZiposHandle *h, **ph;
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__zipos_lock();
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mapsize = sizeof(struct ZiposHandle) + size;
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mapsize = ROUNDUP(mapsize, 4096);
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StartOver:
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ph = &zipos->freelist;
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while ((h = *ph)) {
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if (h->mapsize >= mapsize) {
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if (!_cmpxchg(ph, h, h->next)) goto StartOver;
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h->next = 0;
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break;
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}
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ph = &h->next;
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}
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if (!h) {
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h = __zipos_mmap_space(mapsize);
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}
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__zipos_unlock();
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if (IsAsan()) {
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__asan_unpoison((char *)h, sizeof(struct ZiposHandle) + size);
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__asan_poison((char *)h + sizeof(struct ZiposHandle) + size,
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mapsize - (sizeof(struct ZiposHandle) + size),
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kAsanHeapOverrun);
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}
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if (h) {
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h->size = size;
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h->mapsize = mapsize;
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pthread_mutex_init(&h->lock, 0);
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}
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return h;
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}
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static int __zipos_mkfd(int minfd) {
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int e, fd;
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static bool demodernize;
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if (!demodernize) {
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e = errno;
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if ((fd = __sys_fcntl(2, F_DUPFD_CLOEXEC, minfd)) != -1) {
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return fd;
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} else if (errno == EINVAL) {
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demodernize = true;
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errno = e;
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} else {
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return fd;
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}
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}
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if ((fd = __sys_fcntl(2, F_DUPFD, minfd)) != -1) {
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__sys_fcntl(fd, F_SETFD, FD_CLOEXEC);
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}
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return fd;
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}
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static int __zipos_setfd(int fd, struct ZiposHandle *h, unsigned flags,
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int mode) {
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int want = fd;
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atomic_compare_exchange_strong_explicit(
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&g_fds.f, &want, fd + 1, memory_order_release, memory_order_relaxed);
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g_fds.p[fd].kind = kFdZip;
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g_fds.p[fd].handle = (intptr_t)h;
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g_fds.p[fd].flags = flags | O_CLOEXEC;
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g_fds.p[fd].mode = mode;
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g_fds.p[fd].extra = 0;
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__fds_unlock();
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return fd;
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}
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static int __zipos_load(struct Zipos *zipos, size_t cf, unsigned flags,
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int mode) {
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size_t lf;
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size_t size;
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int rc, fd, minfd;
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struct ZiposHandle *h;
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lf = GetZipCfileOffset(zipos->map + cf);
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npassert((ZIP_LFILE_MAGIC(zipos->map + lf) == kZipLfileHdrMagic));
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size = GetZipLfileUncompressedSize(zipos->map + lf);
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switch (ZIP_LFILE_COMPRESSIONMETHOD(zipos->map + lf)) {
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case kZipCompressionNone:
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if (!(h = __zipos_alloc(zipos, 0))) return -1;
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h->mem = ZIP_LFILE_CONTENT(zipos->map + lf);
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break;
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case kZipCompressionDeflate:
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if (!(h = __zipos_alloc(zipos, size))) return -1;
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if (!__inflate(h->data, size, ZIP_LFILE_CONTENT(zipos->map + lf),
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GetZipLfileCompressedSize(zipos->map + lf))) {
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h->mem = h->data;
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} else {
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h->mem = 0;
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eio();
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}
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break;
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default:
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return eio();
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}
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h->pos = 0;
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h->cfile = cf;
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h->size = size;
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if (h->mem) {
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minfd = 3;
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__fds_lock();
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TryAgain:
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if (IsWindows() || IsMetal()) {
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if ((fd = __reservefd_unlocked(-1)) != -1) {
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return __zipos_setfd(fd, h, flags, mode);
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}
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} else if ((fd = __zipos_mkfd(minfd)) != -1) {
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if (__ensurefds_unlocked(fd) != -1) {
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if (g_fds.p[fd].kind) {
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sys_close(fd);
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minfd = fd + 1;
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goto TryAgain;
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}
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return __zipos_setfd(fd, h, flags, mode);
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}
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sys_close(fd);
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}
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__fds_unlock();
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}
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__zipos_free(zipos, h);
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return -1;
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}
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/**
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* Loads compressed file from αcτµαlly pδrταblε εxεcµταblε object store.
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*
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* @param uri is obtained via __zipos_parseuri()
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* @asyncsignalsafe
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* @threadsafe
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*/
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int __zipos_open(const struct ZiposUri *name, unsigned flags, int mode) {
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int rc;
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ssize_t cf;
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struct Zipos *zipos;
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if (_weaken(pthread_testcancel_np) &&
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(rc = _weaken(pthread_testcancel_np)())) {
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errno = rc;
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return -1;
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}
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BLOCK_SIGNALS;
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if ((flags & O_ACCMODE) == O_RDONLY) {
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if ((zipos = __zipos_get())) {
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if ((cf = __zipos_find(zipos, name)) != -1) {
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rc = __zipos_load(zipos, cf, flags, mode);
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assert(rc != 0);
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} else {
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rc = enoent();
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assert(rc != 0);
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}
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} else {
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rc = enoexec();
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assert(rc != 0);
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}
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} else {
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rc = einval();
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assert(rc != 0);
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}
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ALLOW_SIGNALS;
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return rc;
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}
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