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e16a7d8f3b
`et` means `expandtab`. ```sh rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\) et\(.*\) :vi/vi: \1 xoet\2:vi/' rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\)noet\(.*\):vi/vi: \1et\2 :vi/' rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\)xoet\(.*\):vi/vi: \1noet\2:vi/' ```
75 lines
3.6 KiB
C
75 lines
3.6 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et 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/internal.h"
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#include "libc/calls/struct/fd.internal.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/fmt/magnumstrs.internal.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 POSIX_FADV_SEQUENTIAL, POSIX_FADV_RANDOM, etc.
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* @return 0 on success, or errno on error
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* @raise EBADF if `fd` isn't a valid file descriptor
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* @raise EINVAL if `advice` is invalid or `len` is huge
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* @raise ESPIPE if `fd` refers to a pipe
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* @raise ENOTSUP if `fd` is a /zip file
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* @raise ENOSYS on XNU and OpenBSD
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* @returnserrno
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*/
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errno_t posix_fadvise(int fd, int64_t offset, int64_t len, int advice) {
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int rc, e = errno;
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if (fd < g_fds.n && g_fds.p[fd].kind == kFdZip) {
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rc = enotsup();
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} else if (IsLinux()) {
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rc = sys_fadvise(fd, offset, len, advice);
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} else if (IsFreebsd()) {
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rc = sys_fadvise(fd, offset, len, advice);
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unassert(rc >= 0);
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} else if (IsNetbsd()) {
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rc = sys_fadvise_netbsd(fd, offset, offset, len, advice);
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unassert(rc >= 0);
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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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if (rc == -1) {
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rc = errno;
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errno = e;
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}
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STRACE("posix_fadvise(%d, %'lu, %'lu, %d) → %s", fd, offset, len, advice,
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!rc ? "0" : _strerrno(rc));
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return rc;
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}
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