serenity/Userland/Libraries/LibC/fcntl.cpp

/*
 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
 * Copyright (c) 2021, sin-ack <sin-ack@protonmail.com>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdarg.h>
#include <string.h>
#include <syscall.h>

extern "C" {

int fcntl(int fd, int cmd, ...)
{
    va_list ap;
    va_start(ap, cmd);
    u32 extra_arg = va_arg(ap, u32);
    int rc = syscall(SC_fcntl, fd, cmd, extra_arg);
    va_end(ap);
    __RETURN_WITH_ERRNO(rc, rc, -1);
}

int create_inode_watcher(unsigned flags)
{
    int rc = syscall(SC_create_inode_watcher, flags);
    __RETURN_WITH_ERRNO(rc, rc, -1);
}

int inode_watcher_add_watch(int fd, const char* path, size_t path_length, unsigned event_mask)
{
    Syscall::SC_inode_watcher_add_watch_params params { { path, path_length }, fd, event_mask };
    int rc = syscall(SC_inode_watcher_add_watch, &params);
    __RETURN_WITH_ERRNO(rc, rc, -1);
}

int inode_watcher_remove_watch(int fd, int wd)
{
    int rc = syscall(SC_inode_watcher_remove_watch, fd, wd);
    __RETURN_WITH_ERRNO(rc, rc, -1);
}

int creat(const char* path, mode_t mode)
{
    return open(path, O_CREAT | O_WRONLY | O_TRUNC, mode);
}

int open(const char* path, int options, ...)
{
    if (!path) {
        errno = EFAULT;
        return -1;
    }
    auto path_length = strlen(path);
    if (path_length > INT32_MAX) {
        errno = EINVAL;
        return -1;
    }
    va_list ap;
    va_start(ap, options);
    auto mode = (mode_t)va_arg(ap, unsigned);
    va_end(ap);
    Syscall::SC_open_params params { AT_FDCWD, { path, path_length }, options, mode };
    int rc = syscall(SC_open, &params);
    __RETURN_WITH_ERRNO(rc, rc, -1);
}

int openat(int dirfd, const char* path, int options, ...)
{
    if (!path) {
        errno = EFAULT;
        return -1;
    }
    auto path_length = strlen(path);
    if (path_length > INT32_MAX) {
        errno = EINVAL;
        return -1;
    }
    va_list ap;
    va_start(ap, options);
    auto mode = (mode_t)va_arg(ap, unsigned);
    va_end(ap);
    Syscall::SC_open_params params { dirfd, { path, path_length }, options, mode };
    int rc = syscall(SC_open, &params);
    __RETURN_WITH_ERRNO(rc, rc, -1);
}
}