mirror of
https://github.com/jart/cosmopolitan.git
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76 lines
3.9 KiB
C
76 lines
3.9 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 2023 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/struct/iovec.h"
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/intrin/likely.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/sysv/consts/map.h"
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#include "libc/sysv/consts/prot.h"
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#include "libc/sysv/errfuns.h"
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#include "libc/zipos/zipos.internal.h"
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#define IP(X) (intptr_t)(X)
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#define VIP(X) (void *)IP(X)
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/**
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* Map zipos file into memory. See mmap.
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*
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* @param addr should be 0 or a compatible address
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* @param size must be >0 and will be rounded up to FRAMESIZE
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* automatically.
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* @param prot can have PROT_READ/PROT_WRITE/PROT_EXEC/PROT_NONE/etc.
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* @param flags cannot have `MAP_SHARED` or `MAP_ANONYMOUS`, there is
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* no actual file backing for zipos files. `MAP_SHARED` could be
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* simulated for non-writable mappings, but that would require
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* tracking zipos mappings to prevent making it PROT_WRITE.
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* @param h is a zip store object
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* @param off specifies absolute byte index of h's file for mapping,
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* it does not need to be 64kb aligned.
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* @return virtual base address of new mapping, or MAP_FAILED w/ errno
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*/
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void *__zipos_mmap(void *addr, size_t size, int prot, int flags,
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struct ZiposHandle *h, int64_t off) {
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if (!(flags & MAP_PRIVATE) ||
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(flags & ~(MAP_PRIVATE | MAP_FILE | MAP_FIXED | MAP_FIXED_NOREPLACE)) ||
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(!!(flags & MAP_FIXED) ^ !!(flags & MAP_FIXED_NOREPLACE))) {
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STRACE(
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"zipos mappings currently only support MAP_PRIVATE with select flags");
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return VIP(einval());
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}
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const int tempProt = !IsXnu() ? prot | PROT_WRITE : PROT_WRITE;
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void *outAddr =
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mmap(addr, size, tempProt, (flags & (~MAP_FILE)) | MAP_ANONYMOUS, -1, 0);
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if (outAddr == MAP_FAILED) {
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return MAP_FAILED;
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}
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const int64_t beforeOffset = __zipos_lseek(h, 0, SEEK_CUR);
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if ((beforeOffset == -1) ||
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(__zipos_read(h, &(struct iovec){outAddr, size}, 1, off) == -1) ||
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(__zipos_lseek(h, beforeOffset, SEEK_SET) == -1) ||
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((prot != tempProt) && (mprotect(outAddr, size, prot) == -1))) {
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const int e = errno;
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munmap(outAddr, size);
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errno = e;
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return MAP_FAILED;
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}
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return outAddr;
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}
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