static inline void sched_dupfiles(FAR _TCB *tcb)
{
/* The parent task is the one at the head of the ready-to-run list */
FAR _TCB *rtcb = (FAR _TCB*)g_readytorun.head;
FAR struct file *parent;
FAR struct file *child;
int i;
/* Duplicate the file descriptors. This will be either all of the
* file descriptors or just the first three (stdin, stdout, and stderr)
* if CONFIG_FDCLONE_STDIO is defined. NFSDS_TOCLONE is set
* accordingly above.
*/
if (rtcb->filelist)
{
/* Get pointers to the parent and child task file lists */
parent = rtcb->filelist->fl_files;
child = tcb->filelist->fl_files;
/* Check each file in the parent file list */
for (i = 0; i < NFDS_TOCLONE; i++)
{
/* Check if this file is opened by the parent. We can tell if
* if the file is open because it contain a reference to a non-NULL
* i-node structure.
*/
if (parent[i].f_inode)
{
/* Yes... duplicate it for the child */
(void)files_dup(&parent[i], &child[i]);
}
}
}
}
int dup2(int fildes1, int fildes2)
#endif
{
FAR struct filelist *list;
/* Get the thread-specific file list */
list = sched_getfiles();
if (!list)
{
set_errno(EMFILE);
return ERROR;
}
/* Verify that fildes is a valid, open file descriptor */
if (!DUP_ISOPEN(fildes1, list))
{
set_errno(EBADF);
return ERROR;
}
/* Handle a special case */
if (fildes1 == fildes2)
{
return fildes1;
}
/* Verify fildes2 */
if ((unsigned int)fildes2 >= CONFIG_NFILE_DESCRIPTORS)
{
set_errno(EBADF);
return ERROR;
}
return files_dup(&list->fl_files[fildes1], &list->fl_files[fildes2]);
}