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123 lines
2.4 KiB
C
123 lines
2.4 KiB
C
3 years ago
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/* See the end of this file for copyright, license, and warranty information. */
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#include <ardix/device.h>
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#include <ardix/file.h>
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#include <ardix/malloc.h>
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#include <config.h>
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#include <errno.h>
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#include <stddef.h>
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static struct file *fdtab[CONFIG_NFILE];
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static MUTEX(fdtab_lock);
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static void file_destroy(struct kent *kent)
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{
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struct file *file = container_of(kent, struct file, kent);
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mutex_lock(&fdtab_lock);
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fdtab[file->fd] = NULL;
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mutex_unlock(&fdtab_lock);
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free(file);
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}
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struct file *file_create(struct device *device, enum file_type type, int *err)
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{
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struct file *f;
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struct file **slot;
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int fd;
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mutex_lock(&fdtab_lock);
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for (fd = 0; fd < CONFIG_NFILE; fd++) {
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slot = &fdtab[fd];
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if (*slot == NULL)
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break;
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}
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if (*slot != NULL) {
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*err = -EMFILE;
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mutex_unlock(&fdtab_lock);
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return NULL;
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}
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f = malloc(sizeof(*f));
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if (f == NULL) {
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*err = -ENOMEM;
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mutex_unlock(&fdtab_lock);
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return NULL;
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}
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*slot = f;
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mutex_unlock(&fdtab_lock);
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f->kent.parent = &device->kent;
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f->kent.destroy = file_destroy;
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kent_init(&f->kent);
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f->fd = fd;
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f->device = device;
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f->pos = 0;
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f->type = type;
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mutex_init(&f->lock);
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return f;
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}
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struct file *file_get(int fd)
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{
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struct file *f = NULL;
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if (fd < CONFIG_NFILE) {
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mutex_lock(&fdtab_lock);
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f = fdtab[fd];
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if (f != NULL)
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kent_get(&f->kent);
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mutex_unlock(&fdtab_lock);
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}
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return f;
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}
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void file_put(struct file *f)
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{
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kent_put(&f->kent);
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}
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ssize_t file_read(void *buf, struct file *file, size_t len)
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{
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ssize_t ret;
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mutex_lock(&file->lock);
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ret = file->device->read(buf, file->device, len, file->pos);
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if (file->type == FILE_TYPE_REGULAR && ret > 0)
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file->pos += ret;
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mutex_unlock(&file->lock);
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return ret;
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}
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ssize_t file_write(struct file *file, const void *buf, size_t len)
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{
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ssize_t ret;
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mutex_lock(&file->lock);
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ret = file->device->write(file->device, buf, len, file->pos);
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if (file->type == FILE_TYPE_REGULAR && ret > 0)
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file->pos += ret;
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mutex_unlock(&file->lock);
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return ret;
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}
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/*
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* This file is part of Ardix.
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* Copyright (c) 2020, 2021 Felix Kopp <owo@fef.moe>.
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*
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* Ardix is non-violent software: you may only use, redistribute,
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* and/or modify it under the terms of the CNPLv6+ as found in
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* the LICENSE file in the source code root directory or at
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* <https://git.pixie.town/thufie/CNPL>.
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*
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* Ardix comes with ABSOLUTELY NO WARRANTY, to the extent
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* permitted by applicable law. See the CNPLv6+ for details.
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*/
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