bsd/kern/kern_descrip.c

33  * All or some portions of this file are derived from material licensed
51  *    may be used to endorse or promote products derived from this software
252  * Notes:	Called at system startup from bsd_init().
558  *		uap->from			The fd to dup
572 	int old = uap->from, new = uap->to;
683  * Notes:	This system call differs from fcntl_nocancel() in that it
789 		 * extend a long when we are called from a 32-bit process.
791 		 * from a 32-bit process we lop off the top 32-bits to avoid
1516 	 * SPI (private) for opening a file starting from a dir fd
1579 	 * SPI (private) for unlinking a file starting from a dir fd
1665  * An arbitrary limit, to prevent someone from mapping in a 20GB blob.  This should cover
2142 			/* extract 32 bits of flags from userland */
2381 			/* Check for error from vn_getpath before moving on */
2554  *		has not been subsequently changed out from under it.
2691  *		has not been subsequently changed out from under it.
2705 	/* Keep people from using the filedesc while we are closing it */
3293  * Description:	Get the fileproc pointer for the given fd from the per process
3332  * Description:	Get fileproc and vnode pointer for a given fd from the per
3388  * Description:	Get fileproc, vnode pointer, and vid for a given fd from the
3449  * Description:	Get fileproc and socket pointer for a given fd from the
3469  *		ever called from accept1().
3504  * Description:	Get fileproc and kqueue pointer for a given fd from the
3560  *		from the per process open file table of the specified process
3617  * Description:	Get fileproc and POSIX semaphore pointer for a given fd from
3683  * Description:	Get fileproc and pipe pointer for a given fd from the
3737  * Description:	Get fileproc pointer for a given fd from the per process
3987  * Parameters:	fd				fd to obtain vnode from
4007  *		not be recoverable from the vnode, if there is a subsequent
4047  * Parameters:	fd				fd to obtain vnode from
4068  *		not be recoverable from the vnode, if there is a subsequent
4114  * Parameters:	fd				fd to obtain vnode from
4133  *		not be recoverable from the socket, if there is a subsequent
4619  *		working directory, we inherit the working directory from the
4620  *		thread making the call, rather than from the process.
4625  *		reference there would constitute an "escape" from the chroot
4651 	 * inherit the new current working directory from the current thread
4661 	 * will keep us from using a non-referenced vp
4678 		 * our reference from the parent also
4696 	/* Coming from a chroot environment and unable to get a reference... */
4703 		 * escape from a chroot environment by
4823  *		this is done on process exit(), or from forkproc_free() if
5005  *		close to prevent fd's from being closed out from under
5344  *		dfd				fd to dup from
5396 	 * For ENXIO steal away the file structure from (dfd) and
5552  * Description:	Remove fileglob from message queue
5607  *		!0				Errno from read
5628  *		!0				Errno from write
5651  *		!0				Errno from ioctl
5683  *		!0				Errno from select
5703  *		!0				Errno from close
5723  *		!0				Errno from kqueue filter