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fs/epoll_fd: support dup file descriptor

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Signed-off-by: Jiuzhu Dong <dongjiuzhu1@xiaomi.com>
This commit is contained in:
Jiuzhu Dong 2022-01-26 21:36:49 +08:00 committed by Xiang Xiao
parent bff02fcd79
commit 02ba5f4103
1 changed files with 40 additions and 3 deletions
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43
fs/vfs/fs_epoll.c
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@ -32,6 +32,7 @@
#include <errno.h>
#include <string.h>
#include <debug.h>
#include <semaphore.h>
#include <nuttx/clock.h>
#include <nuttx/fs/fs.h>
@ -47,6 +48,8 @@ struct epoll_head
{
int size;
int occupied;
int crefs;
sem_t sem;
struct file fp;
struct inode in;
FAR epoll_data_t *data;
@ -57,6 +60,7 @@ struct epoll_head
* Private Function Prototypes
****************************************************************************/
static int epoll_do_open(FAR struct file *filep);
static int epoll_do_close(FAR struct file *filep);
static int epoll_do_poll(FAR struct file *filep,
FAR struct pollfd *fds, bool setup);
@ -67,7 +71,7 @@ static int epoll_do_poll(FAR struct file *filep,
static const struct file_operations g_epoll_ops =
{
NULL, /* open */
epoll_do_open, /* open */
epoll_do_close, /* close */
NULL, /* read */
NULL, /* write */
@ -108,12 +112,41 @@ static FAR struct epoll_head *epoll_head_from_fd(int fd)
return (FAR struct epoll_head *)filep->f_inode->i_private;
}
static int epoll_do_open(FAR struct file *filep)
{
FAR struct epoll_head *eph = filep->f_inode->i_private;
int ret;
ret = nxsem_wait(&eph->sem);
if (ret < 0)
{
return ret;
}
eph->crefs++;
nxsem_post(&eph->sem);
return ret;
}
static int epoll_do_close(FAR struct file *filep)
{
FAR struct epoll_head *eph = filep->f_inode->i_private;
int ret;
kmm_free(eph);
return OK;
ret = nxsem_wait(&eph->sem);
if (ret < 0)
{
return ret;
}
eph->crefs--;
nxsem_post(&eph->sem);
if (eph->crefs <= 0)
{
kmm_free(eph);
}
return ret;
}
static int epoll_do_poll(FAR struct file *filep,
@ -138,6 +171,8 @@ static int epoll_do_create(int size, int flags)
return -1;
}
nxsem_init(&eph->sem, 0, 0);
nxsem_set_protocol(&eph->sem, SEM_PRIO_NONE);
eph->size = size;
eph->data = (FAR epoll_data_t *)(eph + 1);
eph->poll = (FAR struct pollfd *)(eph->data + reserve);
@ -155,11 +190,13 @@ static int epoll_do_create(int size, int flags)
fd = files_allocate(&eph->in, flags, 0, eph, 0);
if (fd < 0)
{
nxsem_destroy(&eph->sem);
kmm_free(eph);
set_errno(-fd);
return -1;
}
nxsem_post(&eph->sem);
return fd;
}