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47 lines
2.9 KiB
C
47 lines
2.9 KiB
C
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/*-*- 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 2022 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/cachestat.h"
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#include "libc/intrin/strace.h"
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int sys_cachestat(int, struct cachestat_range *, struct cachestat *, uint32_t);
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/**
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* Query the page cache statistics of a file.
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*
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* @param fd The open file descriptor to retrieve statistics from.
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* @param cstat_range The byte range in `fd` to query. When `len > 0`, the range
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* is `[off..off + len]`. When `len` == 0, the range is from `off` to the end of
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* `fd`.
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* @param cstat The structure where page cache statistics are stored.
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* @param flags Currently unused, and must be set to `0`.
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* @return 0 on success, or -1 w/ errno.
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* @raise EFAULT if `cstat_range` or `cstat` points to invalid memory
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* @raise EINVAL if `flags` is nonzero
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* @raise EBADF if `fd` is negative or not open
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* @raise EOPNOTSUPP if `fd` refers to a hugetlbfs file
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* @raise ENOSYS if not Linux 6.5
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*/
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int cachestat(int fd, struct cachestat_range *cstat_range,
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struct cachestat *cstat, uint32_t flags) {
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int rc;
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rc = sys_cachestat(fd, cstat_range, cstat, flags);
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STRACE("cachestat(%d, %p, %p, %#x) → %d% m", fd, cstat_range, cstat, flags);
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return rc;
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}
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