minix/lib/libsys/copyfd.c

#include "syslib.h"

#include <string.h>

int
copyfd(endpoint_t endpt, int fd, int what)
{
	message m;

	memset(&m, 0, sizeof(m));
	m.VFS_COPYFD_ENDPT = endpt;
	m.VFS_COPYFD_FD = fd;
	m.VFS_COPYFD_WHAT = what;

	return _taskcall(VFS_PROC_NR, COPYFD, &m);
}
libsys: various updates - move system calls for use by services from libminlib into libsys; - move srv_fork(2) and srv_kill(2) from RS and into libsys; - replace getprocnr(2) with sef_self(3); - rename previous getnprocnr(2) to getprocnr(2); - clean up getepinfo(2); - change all libsys calls that used _syscall to use _taskcall, so as to avoid going through errno to pass errors; this is already how most calls work anyway, and many of the calls previously using _syscall were already assumed to return the actual error; - initialize request messages to zero, for future compatibility (note that this does not include PCI calls, which are in need of a much bigger overhaul, nor kernel calls); - clean up more of dead DS code as a side effect. Change-Id: I8788f54c68598fcf58e23486e270c2d749780ebb 2013-11-03 22:33:44 +01:00			`#include "syslib.h"`

Extend dupfrom(2) into copyfd(2) This single function allows copying file descriptors from and to processes, and closing a previously copied remote file descriptor. This function replaces the five FD-related UDS backcalls. While it limits the total number of in-flight file descriptors to OPEN_MAX, this change greatly improves crash recovery support of UDS, since all in-flight file descriptors will be closed instead of keeping them open indefinitely (causing VFS to crash on system shutdown). With the new copyfd call, UDS becomes simpler, and the concept of filps is no longer exposed outside of VFS. This patch also moves the checkperms(2) stub into libminlib, thus fully abstracting away message details of VFS communication from UDS. Change-Id: Idd32ad390a566143c8ef66955e5ae2c221cff966 2013-10-05 16:31:35 +02:00			`#include <string.h>`

			`int`
			`copyfd(endpoint_t endpt, int fd, int what)`
			`{`
			`message m;`

			`memset(&m, 0, sizeof(m));`
			`m.VFS_COPYFD_ENDPT = endpt;`
			`m.VFS_COPYFD_FD = fd;`
			`m.VFS_COPYFD_WHAT = what;`

libsys: various updates - move system calls for use by services from libminlib into libsys; - move srv_fork(2) and srv_kill(2) from RS and into libsys; - replace getprocnr(2) with sef_self(3); - rename previous getnprocnr(2) to getprocnr(2); - clean up getepinfo(2); - change all libsys calls that used _syscall to use _taskcall, so as to avoid going through errno to pass errors; this is already how most calls work anyway, and many of the calls previously using _syscall were already assumed to return the actual error; - initialize request messages to zero, for future compatibility (note that this does not include PCI calls, which are in need of a much bigger overhaul, nor kernel calls); - clean up more of dead DS code as a side effect. Change-Id: I8788f54c68598fcf58e23486e270c2d749780ebb 2013-11-03 22:33:44 +01:00			`return _taskcall(VFS_PROC_NR, COPYFD, &m);`
Extend dupfrom(2) into copyfd(2) This single function allows copying file descriptors from and to processes, and closing a previously copied remote file descriptor. This function replaces the five FD-related UDS backcalls. While it limits the total number of in-flight file descriptors to OPEN_MAX, this change greatly improves crash recovery support of UDS, since all in-flight file descriptors will be closed instead of keeping them open indefinitely (causing VFS to crash on system shutdown). With the new copyfd call, UDS becomes simpler, and the concept of filps is no longer exposed outside of VFS. This patch also moves the checkperms(2) stub into libminlib, thus fully abstracting away message details of VFS communication from UDS. Change-Id: Idd32ad390a566143c8ef66955e5ae2c221cff966 2013-10-05 16:31:35 +02:00			`}`