mirror of
https://github.com/jart/cosmopolitan.git
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63 lines
3.1 KiB
C
63 lines
3.1 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/calls/calls.h"
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#include "libc/calls/cp.internal.h"
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#include "libc/calls/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/intrin/strace.h"
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#include "libc/runtime/runtime.h"
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#include "libc/sysv/errfuns.h"
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/**
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* Blocks until kernel flushes buffers for fd to disk.
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*
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* @return 0 on success, or -1 w/ errno
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* @raise ECANCELED if thread was cancelled in masked mode
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* @raise EROFS if `fd` is on a read-only filesystem e.g. /zip
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* @raise EINVAL if `fd` is a special file w/o synchronization
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* @raise ENOSPC if disk space was exhausted
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* @raise EBADF if `fd` isn't an open file
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* @raise EINTR if signal was delivered
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* @raise EIO if an i/o error happened
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* @see __nosync to secretly disable
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* @see fdatasync()
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* @cancelationpoint
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* @asyncsignalsafe
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*/
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int fsync(int fd) {
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int rc;
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bool fake = __nosync == 0x5453455454534146;
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BEGIN_CANCELATION_POINT;
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if (__isfdkind(fd, kFdZip)) {
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rc = erofs();
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} else if (!IsWindows()) {
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if (!fake) {
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rc = sys_fsync(fd);
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} else {
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rc = sys_fsync_fake(fd);
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}
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} else {
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rc = sys_fdatasync_nt(fd, fake);
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}
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END_CANCELATION_POINT;
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STRACE("fsync%s(%d) → %d% m", fake ? "_fake" : "", fd, rc);
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return rc;
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}
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