handle.c

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#include <stdbool.h>
#include <stdint.h>
 
#include <sys/kassert.h>
#include <sys/queue.h>
#include <sys/kmem.h>
#include <sys/handle.h>
#include <sys/thread.h>
#include <sys/syscall.h>
 
Slab handleSlab;
 
void
Handle_GlobalInit()
{
    Slab_Init(&handleSlab, "Handle Objects", sizeof(Handle), 16);
}
 
DEFINE_SLAB(Handle, &handleSlab);
 
void
Handle_Init(Process *proc)
{
    int i;
 
    for (i = 0; i < PROCESS_HANDLE_SLOTS; i++) {
        TAILQ_INIT(&proc->handles[i]);
    }
}
 
void
Handle_Destroy(Process *proc)
{
    int i;
    Handle *handle, *handle_tmp;
 
    for (i = 0; i < PROCESS_HANDLE_SLOTS; i++) {
        TAILQ_FOREACH_SAFE(handle, &proc->handles[i], handleList, handle_tmp) {
            TAILQ_REMOVE(&proc->handles[i], handle, handleList);
            (handle->close)(handle);
        }
    }
}
 
uint64_t
Handle_Add(Process *proc, Handle *handle)
{
    int slot;
 
    handle->fd = proc->nextFD;
    proc->nextFD++;
    handle->processId = proc->pid;
 
    slot = handle->fd % PROCESS_HANDLE_SLOTS;
 
    TAILQ_INSERT_HEAD(&proc->handles[slot], handle, handleList);
 
    return handle->fd;
}
 
void
Handle_Remove(Process *proc, Handle *handle)
{
    int slot = handle->fd % PROCESS_HANDLE_SLOTS;
 
    TAILQ_REMOVE(&proc->handles[slot], handle, handleList);
}
 
Handle *
Handle_Lookup(Process *proc, uint64_t fd)
{
    int slot = fd % PROCESS_HANDLE_SLOTS;
    Handle *handle;
 
    TAILQ_FOREACH(handle, &proc->handles[slot], handleList) {
        if (handle->fd == fd)
            return handle;
    }
 
    return NULL;
}