mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-07-13 14:39:10 +00:00
Linux: Add cachestat, fchmodat2 syscalls (#958)
This commit is contained in:
parent
69faf1b403
commit
cc5c5319bf
8 changed files with 287 additions and 1 deletions
47
libc/calls/cachestat.c
Normal file
47
libc/calls/cachestat.c
Normal file
|
@ -0,0 +1,47 @@
|
|||
/*-*- 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 2022 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/calls/cachestat.h"
|
||||
#include "libc/intrin/strace.internal.h"
|
||||
|
||||
int sys_cachestat(int, struct cachestat_range *, struct cachestat *, uint32_t);
|
||||
|
||||
/**
|
||||
* Query the page cache statistics of a file.
|
||||
*
|
||||
* @param fd The open file descriptor to retrieve statistics from.
|
||||
* @param cstat_range The byte range in `fd` to query. When `len > 0`, the range
|
||||
* is `[off..off + len]`. When `len` == 0, the range is from `off` to the end of
|
||||
* `fd`.
|
||||
* @param cstat The structure where page cache statistics are stored.
|
||||
* @param flags Currently unused, and must be set to `0`.
|
||||
* @return 0 on success, or -1 w/ errno.
|
||||
* @raise EFAULT if `cstat_range` or `cstat` points to invalid memory
|
||||
* @raise EINVAL if `flags` is nonzero
|
||||
* @raise EBADF if `fd` is negative or not open
|
||||
* @raise EOPNOTSUPP if `fd` refers to a hugetlbfs file
|
||||
* @raise ENOSYS if not Linux 6.5
|
||||
*/
|
||||
int cachestat(int fd, struct cachestat_range *cstat_range,
|
||||
struct cachestat *cstat, uint32_t flags) {
|
||||
int rc;
|
||||
rc = sys_cachestat(fd, cstat_range, cstat, flags);
|
||||
STRACE("cachestat(%d, %p, %p, %#x) → %d% m", fd, cstat_range, cstat, flags);
|
||||
return rc;
|
||||
}
|
34
libc/calls/cachestat.h
Normal file
34
libc/calls/cachestat.h
Normal file
|
@ -0,0 +1,34 @@
|
|||
#ifndef COSMOPOLITAN_LIBC_CALLS_CACHESTAT_H_
|
||||
#define COSMOPOLITAN_LIBC_CALLS_CACHESTAT_H_
|
||||
|
||||
#if !(__ASSEMBLER__ + __LINKER__ + 0)
|
||||
COSMOPOLITAN_C_START_
|
||||
|
||||
struct cachestat_range {
|
||||
uint64_t off;
|
||||
uint64_t len;
|
||||
};
|
||||
|
||||
struct cachestat {
|
||||
/** Number of cached pages. */
|
||||
uint64_t nr_cache;
|
||||
/** Number of dirty pages */
|
||||
uint64_t nr_dirty;
|
||||
/** Number of pages marked for writeback. */
|
||||
uint64_t nr_writeback;
|
||||
/** Number of pages evicted from the cache. */
|
||||
uint64_t nr_evicted;
|
||||
/**
|
||||
* Number of recently evicted pages.
|
||||
* A page is recently evicted if its last eviction was recent enough that its
|
||||
* reentry to the cache would indicate that it is actively being used by the
|
||||
* system, and that there is memory pressure on the system.
|
||||
*/
|
||||
uint64_t nr_recently_evicted;
|
||||
};
|
||||
|
||||
int cachestat(int, struct cachestat_range *, struct cachestat *, uint32_t);
|
||||
|
||||
COSMOPOLITAN_C_END_
|
||||
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
|
||||
#endif /* COSMOPOLITAN_LIBC_CALLS_LANDLOCK_H_ */
|
|
@ -20,6 +20,7 @@
|
|||
#include "libc/calls/syscall-nt.internal.h"
|
||||
#include "libc/calls/syscall-sysv.internal.h"
|
||||
#include "libc/dce.h"
|
||||
#include "libc/errno.h"
|
||||
#include "libc/intrin/asan.internal.h"
|
||||
#include "libc/intrin/describeflags.internal.h"
|
||||
#include "libc/intrin/strace.internal.h"
|
||||
|
@ -28,6 +29,7 @@
|
|||
#include "libc/sysv/errfuns.h"
|
||||
|
||||
int sys_fchmodat_linux(int, const char *, unsigned, int);
|
||||
int sys_fchmodat2(int, const char *, unsigned, int);
|
||||
|
||||
/**
|
||||
* Changes permissions on file, e.g.:
|
||||
|
@ -40,6 +42,9 @@ int sys_fchmodat_linux(int, const char *, unsigned, int);
|
|||
* @param mode contains octal flags (base 8)
|
||||
* @param flags can have `AT_SYMLINK_NOFOLLOW`
|
||||
* @raise EROFS if `dirfd` or `path` use zip file system
|
||||
* @raise EOPNOTSUP on Linux if `path` is a symbolic link, `AT_SYMLINK_NOFOLLOW`
|
||||
* is set in `flags`, and filesystem does not support setting the mode of
|
||||
* symbolic links.
|
||||
* @errors ENOENT, ENOTDIR, ENOSYS
|
||||
* @asyncsignalsafe
|
||||
* @see fchmod()
|
||||
|
@ -53,7 +58,12 @@ int fchmodat(int dirfd, const char *path, uint32_t mode, int flags) {
|
|||
rc = erofs();
|
||||
} else if (!IsWindows()) {
|
||||
if (IsLinux() && flags) {
|
||||
rc = sys_fchmodat_linux(dirfd, path, mode, flags);
|
||||
int serrno = errno;
|
||||
rc = sys_fchmodat2(dirfd, path, mode, flags);
|
||||
if (rc == -1 && errno == ENOSYS) {
|
||||
errno = serrno;
|
||||
rc = sys_fchmodat_linux(dirfd, path, mode, flags);
|
||||
}
|
||||
} else {
|
||||
rc = sys_fchmodat(dirfd, path, mode, flags);
|
||||
}
|
||||
|
|
Loading…
Add table
Add a link
Reference in a new issue