mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
55 lines
2.8 KiB
C
55 lines
2.8 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/bits/safemacros.h"
|
|
#include "libc/calls/calls.h"
|
|
#include "libc/limits.h"
|
|
#include "libc/runtime/ezmap.internal.h"
|
|
#include "libc/runtime/runtime.h"
|
|
#include "libc/sysv/consts/map.h"
|
|
#include "libc/sysv/consts/o.h"
|
|
#include "libc/sysv/consts/prot.h"
|
|
|
|
hidden int MapFileRead(const char *filename, struct MappedFile *mf) {
|
|
mf->addr = MAP_FAILED;
|
|
if ((mf->fd = open(filename, O_RDONLY)) != -1 &&
|
|
(mf->size = getfiledescriptorsize(mf->fd)) < INT_MAX &&
|
|
(mf->addr = mf->size ? mmap(NULL, mf->size, PROT_READ,
|
|
MAP_PRIVATE | MAP_POPULATE, mf->fd, 0)
|
|
: NULL) != MAP_FAILED) {
|
|
return 0;
|
|
} else {
|
|
UnmapFile(mf);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
hidden int UnmapFile(struct MappedFile *mf) {
|
|
int rc;
|
|
rc = 0;
|
|
if (mf->addr && mf->addr != MAP_FAILED) {
|
|
rc |= munmap(mf->addr, mf->size);
|
|
mf->addr = MAP_FAILED;
|
|
}
|
|
if (mf->fd != -1) {
|
|
rc |= close(mf->fd);
|
|
mf->fd = -1;
|
|
}
|
|
mf->size = 0;
|
|
return rc;
|
|
}
|