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/*
* Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Hyra nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/filedesc.h>
#include <sys/proc.h>
#include <sys/sched.h>
#include <vm/dynalloc.h>
#include <assert.h>
#include <string.h>
/*
* Allocate a file descriptor.
*
* @td: Thread to allocate from, NULL for current thread.
*/
struct filedesc *
fd_alloc(struct proc *td)
{
struct filedesc *fd;
if (td == NULL) {
td = this_td();
__assert(td != NULL);
}
for (size_t i = 0; i < PROC_MAX_FDS; ++i) {
if (td->fds[i] != NULL) {
continue;
}
fd = dynalloc(sizeof(struct filedesc));
memset(fd, 0, sizeof(struct filedesc));
if (fd == NULL) {
return NULL;
}
fd->fdno = i;
td->fds[i] = fd;
return fd;
}
return NULL;
}
/*
* Fetch a file descriptor from a file descriptor
* number.
*
* @td: Thread to fetch from, NULL for current thread.
* @fdno: File descriptor to fetch
*/
struct filedesc *
fd_from_fdnum(const struct proc *td, int fdno)
{
if (td == NULL) {
td = this_td();
__assert(td != NULL);
}
if (fdno < 0 || fdno > PROC_MAX_FDS) {
return NULL;
}
for (size_t i = 0; i < PROC_MAX_FDS; ++i) {
if (i == fdno && td->fds[i] != NULL) {
return td->fds[i];
}
}
return NULL;
}
/*
* Close a file descriptor from its fd number.
*
* @td: Thread to fetch from, NULL for current thread.
* @fdno: File descriptor number to close.
*/
void
fd_close_fdnum(struct proc *td, int fdno)
{
struct filedesc *fd;
if (td == NULL) {
td = this_td();
__assert(td != NULL);
}
fd = fd_from_fdnum(td, fdno);
if (fd == NULL) {
return;
}
dynfree(fd);
td->fds[fdno] = NULL;
}
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