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

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
3 changed files with 40 additions and 0 deletions

View file

@ -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();
}
}