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.
223 lines
7.2 KiB
C
223 lines
7.2 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
||
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
|
||
╞══════════════════════════════════════════════════════════════════════════════╡
|
||
│ Copyright 2020 Justine Alexandra Roberts Tunney │
|
||
│ │
|
||
│ Permission to use, copy, modify, and/or distribute this software for │
|
||
│ any purpose with or without fee is hereby granted, provided that the │
|
||
│ above copyright notice and this permission notice appear in all copies. │
|
||
│ │
|
||
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
|
||
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
|
||
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
|
||
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
|
||
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
|
||
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
|
||
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
|
||
│ PERFORMANCE OF THIS SOFTWARE. │
|
||
╚─────────────────────────────────────────────────────────────────────────────*/
|
||
#include "libc/assert.h"
|
||
#include "libc/calls/blocksigs.internal.h"
|
||
#include "libc/calls/calls.h"
|
||
#include "libc/calls/internal.h"
|
||
#include "libc/calls/state.internal.h"
|
||
#include "libc/calls/struct/sigset.h"
|
||
#include "libc/calls/syscall-sysv.internal.h"
|
||
#include "libc/dce.h"
|
||
#include "libc/errno.h"
|
||
#include "libc/intrin/asan.internal.h"
|
||
#include "libc/intrin/atomic.h"
|
||
#include "libc/intrin/cmpxchg.h"
|
||
#include "libc/intrin/directmap.internal.h"
|
||
#include "libc/intrin/extend.internal.h"
|
||
#include "libc/intrin/weaken.h"
|
||
#include "libc/runtime/internal.h"
|
||
#include "libc/runtime/memtrack.internal.h"
|
||
#include "libc/sysv/consts/f.h"
|
||
#include "libc/sysv/consts/fd.h"
|
||
#include "libc/sysv/consts/map.h"
|
||
#include "libc/sysv/consts/o.h"
|
||
#include "libc/sysv/consts/prot.h"
|
||
#include "libc/sysv/consts/sig.h"
|
||
#include "libc/sysv/errfuns.h"
|
||
#include "libc/thread/thread.h"
|
||
#include "libc/zip.internal.h"
|
||
#include "libc/zipos/zipos.internal.h"
|
||
|
||
static char *mapend;
|
||
static size_t maptotal;
|
||
|
||
static void *__zipos_mmap_space(size_t mapsize) {
|
||
char *start;
|
||
size_t offset;
|
||
_unassert(mapsize);
|
||
offset = maptotal;
|
||
maptotal += mapsize;
|
||
start = (char *)kMemtrackZiposStart;
|
||
if (!mapend) mapend = start;
|
||
mapend = _extend(start, maptotal, mapend, MAP_PRIVATE,
|
||
kMemtrackZiposStart + kMemtrackZiposSize);
|
||
return start + offset;
|
||
}
|
||
|
||
static struct ZiposHandle *__zipos_alloc(struct Zipos *zipos, size_t size) {
|
||
size_t mapsize;
|
||
struct ZiposHandle *h, **ph;
|
||
__zipos_lock();
|
||
mapsize = sizeof(struct ZiposHandle) + size;
|
||
mapsize = ROUNDUP(mapsize, 4096);
|
||
StartOver:
|
||
ph = &zipos->freelist;
|
||
while ((h = *ph)) {
|
||
if (h->mapsize >= mapsize) {
|
||
if (!_cmpxchg(ph, h, h->next)) goto StartOver;
|
||
h->next = 0;
|
||
break;
|
||
}
|
||
ph = &h->next;
|
||
}
|
||
if (!h) {
|
||
h = __zipos_mmap_space(mapsize);
|
||
}
|
||
__zipos_unlock();
|
||
if (IsAsan()) {
|
||
__asan_unpoison((char *)h, sizeof(struct ZiposHandle) + size);
|
||
__asan_poison((char *)h + sizeof(struct ZiposHandle) + size,
|
||
mapsize - (sizeof(struct ZiposHandle) + size),
|
||
kAsanHeapOverrun);
|
||
}
|
||
if (h) {
|
||
h->size = size;
|
||
h->mapsize = mapsize;
|
||
pthread_mutex_init(&h->lock, 0);
|
||
}
|
||
return h;
|
||
}
|
||
|
||
static int __zipos_mkfd(int minfd) {
|
||
int e, fd;
|
||
static bool demodernize;
|
||
if (!demodernize) {
|
||
e = errno;
|
||
if ((fd = __sys_fcntl(2, F_DUPFD_CLOEXEC, minfd)) != -1) {
|
||
return fd;
|
||
} else if (errno == EINVAL) {
|
||
demodernize = true;
|
||
errno = e;
|
||
} else {
|
||
return fd;
|
||
}
|
||
}
|
||
if ((fd = __sys_fcntl(2, F_DUPFD, minfd)) != -1) {
|
||
__sys_fcntl(fd, F_SETFD, FD_CLOEXEC);
|
||
}
|
||
return fd;
|
||
}
|
||
|
||
static int __zipos_setfd(int fd, struct ZiposHandle *h, unsigned flags,
|
||
int mode) {
|
||
int want = fd;
|
||
atomic_compare_exchange_strong_explicit(
|
||
&g_fds.f, &want, fd + 1, memory_order_release, memory_order_relaxed);
|
||
g_fds.p[fd].kind = kFdZip;
|
||
g_fds.p[fd].handle = (intptr_t)h;
|
||
g_fds.p[fd].flags = flags | O_CLOEXEC;
|
||
g_fds.p[fd].mode = mode;
|
||
g_fds.p[fd].extra = 0;
|
||
__fds_unlock();
|
||
return fd;
|
||
}
|
||
|
||
static int __zipos_load(struct Zipos *zipos, size_t cf, unsigned flags,
|
||
int mode) {
|
||
size_t lf;
|
||
size_t size;
|
||
int rc, fd, minfd;
|
||
struct ZiposHandle *h;
|
||
lf = GetZipCfileOffset(zipos->map + cf);
|
||
_npassert((ZIP_LFILE_MAGIC(zipos->map + lf) == kZipLfileHdrMagic));
|
||
size = GetZipLfileUncompressedSize(zipos->map + lf);
|
||
switch (ZIP_LFILE_COMPRESSIONMETHOD(zipos->map + lf)) {
|
||
case kZipCompressionNone:
|
||
if (!(h = __zipos_alloc(zipos, 0))) return -1;
|
||
h->mem = ZIP_LFILE_CONTENT(zipos->map + lf);
|
||
break;
|
||
case kZipCompressionDeflate:
|
||
if (!(h = __zipos_alloc(zipos, size))) return -1;
|
||
if (!__inflate(h->data, size, ZIP_LFILE_CONTENT(zipos->map + lf),
|
||
GetZipLfileCompressedSize(zipos->map + lf))) {
|
||
h->mem = h->data;
|
||
} else {
|
||
h->mem = 0;
|
||
eio();
|
||
}
|
||
break;
|
||
default:
|
||
return eio();
|
||
}
|
||
h->pos = 0;
|
||
h->cfile = cf;
|
||
h->size = size;
|
||
if (h->mem) {
|
||
minfd = 3;
|
||
__fds_lock();
|
||
TryAgain:
|
||
if (IsWindows() || IsMetal()) {
|
||
if ((fd = __reservefd_unlocked(-1)) != -1) {
|
||
return __zipos_setfd(fd, h, flags, mode);
|
||
}
|
||
} else if ((fd = __zipos_mkfd(minfd)) != -1) {
|
||
if (__ensurefds_unlocked(fd) != -1) {
|
||
if (g_fds.p[fd].kind) {
|
||
sys_close(fd);
|
||
minfd = fd + 1;
|
||
goto TryAgain;
|
||
}
|
||
return __zipos_setfd(fd, h, flags, mode);
|
||
}
|
||
sys_close(fd);
|
||
}
|
||
__fds_unlock();
|
||
}
|
||
__zipos_free(zipos, h);
|
||
return -1;
|
||
}
|
||
|
||
/**
|
||
* Loads compressed file from αcτµαlly pδrταblε εxεcµταblε object store.
|
||
*
|
||
* @param uri is obtained via __zipos_parseuri()
|
||
* @asyncsignalsafe
|
||
* @threadsafe
|
||
*/
|
||
int __zipos_open(const struct ZiposUri *name, unsigned flags, int mode) {
|
||
int rc;
|
||
ssize_t cf;
|
||
struct Zipos *zipos;
|
||
if (_weaken(pthread_testcancel_np) &&
|
||
(rc = _weaken(pthread_testcancel_np)())) {
|
||
errno = rc;
|
||
return -1;
|
||
}
|
||
BLOCK_SIGNALS;
|
||
if ((flags & O_ACCMODE) == O_RDONLY) {
|
||
if ((zipos = __zipos_get())) {
|
||
if ((cf = __zipos_find(zipos, name)) != -1) {
|
||
rc = __zipos_load(zipos, cf, flags, mode);
|
||
assert(rc != 0);
|
||
} else {
|
||
rc = enoent();
|
||
assert(rc != 0);
|
||
}
|
||
} else {
|
||
rc = enoexec();
|
||
assert(rc != 0);
|
||
}
|
||
} else {
|
||
rc = einval();
|
||
assert(rc != 0);
|
||
}
|
||
ALLOW_SIGNALS;
|
||
return rc;
|
||
}
|