mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-08 15:33:33 +00:00
b76b2be2d0
readdir() will now always yield an inode that's consistent with stat() on ZipOS and Windows in general. More APIs have been updated to return the appropriate error code when inappropriately trying to do ops, like sockets, with a zip file descriptor. The path normalization algorithms are now fully fleshed out. Some socket APIs have been fixed so they'll raise EBADF vs. ENOTSOCK appropriately. Lastly seekdir() will now work properly on NetBSD and FreeBSD (not sure why anyone would even use it)
87 lines
3.8 KiB
C
87 lines
3.8 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/assert.h"
|
|
#include "libc/calls/calls.h"
|
|
#include "libc/calls/cp.internal.h"
|
|
#include "libc/calls/internal.h"
|
|
#include "libc/calls/struct/fd.internal.h"
|
|
#include "libc/calls/struct/iovec.h"
|
|
#include "libc/calls/struct/iovec.internal.h"
|
|
#include "libc/calls/syscall-sysv.internal.h"
|
|
#include "libc/dce.h"
|
|
#include "libc/intrin/asan.internal.h"
|
|
#include "libc/intrin/strace.internal.h"
|
|
#include "libc/macros.internal.h"
|
|
#include "libc/sysv/errfuns.h"
|
|
|
|
/**
|
|
* Writes to file at offset.
|
|
*
|
|
* This function never changes the current position of `fd`.
|
|
*
|
|
* @param fd is something open()'d earlier, noting pipes might not work
|
|
* @param buf is copied from, cf. copy_file_range(), sendfile(), etc.
|
|
* @param size in range [1..0x7ffff000] is reasonable
|
|
* @param offset is bytes from start of file at which write begins,
|
|
* which can exceed or overlap the end of file, in which case your
|
|
* file will be extended
|
|
* @return [1..size] bytes on success, or -1 w/ errno; noting zero is
|
|
* impossible unless size was passed as zero to do an error check
|
|
* @see pread(), write()
|
|
* @cancellationpoint
|
|
* @asyncsignalsafe
|
|
* @threadsafe
|
|
* @vforksafe
|
|
*/
|
|
ssize_t pwrite(int fd, const void *buf, size_t size, int64_t offset) {
|
|
ssize_t rc;
|
|
size_t wrote;
|
|
BEGIN_CANCELLATION_POINT;
|
|
|
|
if (offset < 0) {
|
|
rc = einval();
|
|
} else if (fd == -1) {
|
|
rc = ebadf();
|
|
} else if (IsAsan() && !__asan_is_valid(buf, size)) {
|
|
rc = efault();
|
|
} else if (__isfdkind(fd, kFdZip)) {
|
|
rc = ebadf();
|
|
} else if (!IsWindows()) {
|
|
rc = sys_pwrite(fd, buf, size, offset, offset);
|
|
} else if (__isfdkind(fd, kFdFile)) {
|
|
rc = sys_write_nt(fd, (struct iovec[]){{buf, size}}, 1, offset);
|
|
} else {
|
|
return ebadf();
|
|
}
|
|
if (rc != -1) {
|
|
wrote = (size_t)rc;
|
|
if (!wrote) {
|
|
npassert(size == 0);
|
|
} else {
|
|
npassert(wrote <= size);
|
|
}
|
|
}
|
|
|
|
END_CANCELLATION_POINT;
|
|
DATATRACE("pwrite(%d, %#.*hhs%s, %'zu, %'zd) → %'zd% m", fd,
|
|
MAX(0, MIN(40, rc)), buf, rc > 40 ? "..." : "", size, offset, rc);
|
|
return rc;
|
|
}
|
|
|
|
__strong_reference(pwrite, pwrite64);
|