mirror of
https://github.com/jart/cosmopolitan.git
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b8a6a989c0
This change greatly reduces the number of modules that need to be compiled. The only issue right now is that sometimes when viewing symbol table entries, the aliased symbol is chosen.
69 lines
3.3 KiB
C
69 lines
3.3 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 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/calls.h"
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#include "libc/calls/syscall-nt.internal.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/strace.internal.h"
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#include "libc/str/str.h"
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#include "libc/sysv/errfuns.h"
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int sys_fadvise_netbsd(int, int, int64_t, int64_t, int) asm("sys_fadvise");
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/**
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* Drops hints to O/S about intended I/O behavior.
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*
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* It makes a huge difference. For example, when copying a large file,
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* it can stop the system from persisting GBs of useless memory content.
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*
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* @param len 0 means until end of file
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* @param advice can be MADV_SEQUENTIAL, MADV_RANDOM, etc.
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* @return 0 on success, or -1 w/ errno
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* @raise EBADF if `fd` isn't a valid file descriptor
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* @raise ESPIPE if `fd` refers to a pipe
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* @raise EINVAL if `advice` was invalid
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* @raise ENOSYS on XNU and OpenBSD
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*/
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int fadvise(int fd, uint64_t offset, uint64_t len, int advice) {
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int rc, e = errno;
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if (IsLinux()) {
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rc = sys_fadvise(fd, offset, len, advice);
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} else if (IsFreebsd() || IsNetbsd()) {
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if (IsFreebsd()) {
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rc = sys_fadvise(fd, offset, len, advice);
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} else {
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rc = sys_fadvise_netbsd(fd, offset, offset, len, advice);
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}
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_npassert(rc >= 0);
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if (rc) {
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errno = rc;
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rc = -1;
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}
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} else if (IsWindows()) {
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rc = sys_fadvise_nt(fd, offset, len, advice);
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} else {
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rc = enosys();
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}
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STRACE("fadvise(%d, %'lu, %'lu, %d) → %d% m", fd, offset, len, advice, rc);
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return rc;
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}
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__strong_reference(fadvise, fadvise64);
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