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LibC: Implement posix_fadvise() (as a harmless no-op)

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This commit is contained in:
Andreas Kling 2022-04-29 20:54:43 +02:00
parent 910532b8dc
commit a7f702a021
2 changed files with 18 additions and 1 deletions
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15
Userland/Libraries/LibC/fcntl.cpp
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@ -87,4 +87,19 @@ int openat(int dirfd, char const* path, int options, ...)
int rc = syscall(SC_open, &params); int rc = syscall(SC_open, &params);
__RETURN_WITH_ERRNO(rc, rc, -1); __RETURN_WITH_ERRNO(rc, rc, -1);
} }
// https://pubs.opengroup.org/onlinepubs/9699919799/functions/posix_fadvise.html
int posix_fadvise(int fd, off_t offset, off_t len, int advice)
{
// Per POSIX:
// "The posix_fadvise() function shall have no effect on the semantics of other operations on the specified data,
// although it may affect the performance of other operations."
// For now, we simply ignore posix_fadvise() requests. In the future we may use them to optimize performance.
(void)fd;
(void)offset;
(void)len;
(void)advice;
return 0;
}
} }

4
Userland/Libraries/LibC/fcntl.h
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@ -1,5 +1,5 @@
/* /*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org> * Copyright (c) 2018-2022, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021, sin-ack <sin-ack@protonmail.com> * Copyright (c) 2021, sin-ack <sin-ack@protonmail.com>
* *
* SPDX-License-Identifier: BSD-2-Clause * SPDX-License-Identifier: BSD-2-Clause
@ -20,4 +20,6 @@ int create_inode_watcher(unsigned flags);
int inode_watcher_add_watch(int fd, char const* path, size_t path_length, unsigned event_mask); int inode_watcher_add_watch(int fd, char const* path, size_t path_length, unsigned event_mask);
int inode_watcher_remove_watch(int fd, int wd); int inode_watcher_remove_watch(int fd, int wd);
int posix_fadvise(int fd, off_t offset, off_t len, int advice);
__END_DECLS __END_DECLS