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LibC: Implement flock(2) using fcntl's F_SETLK

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While flock is not a posix interface, it exists on linux and all BSDs as
far as I am aware.
This commit is contained in:
Peter Elliott 2021-07-18 23:55:13 -06:00 committed by Ali Mohammad Pur
parent 3fa2816642
commit 2ce8cca7b5
Notes: sideshowbarker 2024-07-18 08:41:03 +09:00 
Author: https://github.com/petelliott
Commit: https://github.com/SerenityOS/serenity/commit/2ce8cca7b5f
Pull-request: https://github.com/SerenityOS/serenity/pull/8878
Reviewed-by: https://github.com/alimpfard ✅
3 changed files with 40 additions and 0 deletions
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1
Userland/Libraries/LibC/CMakeLists.txt
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@ -39,6 +39,7 @@ set(LIBC_SOURCES
strings.cpp
stubs.cpp
syslog.cpp
sys/file.cpp
sys/mman.cpp
sys/prctl.cpp
sys/ptrace.cpp

26
Userland/Libraries/LibC/sys/file.cpp Normal file
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@ -0,0 +1,26 @@
/*
* Copyright (c) 2021, Peter Elliott <pelliott@ualberta.ca>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Assertions.h>
#include <fcntl.h>
#include <stdio.h>
#include <sys/file.h>
extern "C" {
int flock(int fd, int operation)
{
struct flock lock {
short(operation & 0b11), SEEK_SET, 0, 0, 0
};
if (operation & LOCK_NB) {
return fcntl(fd, F_SETLK, &lock);
}
// FIXME: Implement F_SETLKW in fcntl.
VERIFY_NOT_REACHED();
}
}

13
Userland/Libraries/LibC/sys/file.h
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@ -5,3 +5,16 @@
*/
#pragma once
#include <sys/cdefs.h>
__BEGIN_DECLS
#define LOCK_SH 0
#define LOCK_EX 1
#define LOCK_UN 2
#define LOCK_NB (1 << 2)
int flock(int fd, int operation);
__END_DECLS