IO-FDPass/FDPass.xs

#ifdef __sun
  #define _XOPEN_SOURCE 1
  #define _XOPEN_SOURCE_EXTENDED 1
  #define __EXTENSIONS__ 1
#endif

#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"

#if WIN32

  /* perl probably did this already */
  #include <windows.h>

#elif __CYGWIN__

  #include <windows.h>
  #include <io.h>
  #include <sys/cygwin.h>

  #define ioctlsocket(a,b,c) ioctl (a, b, c)
  #define _open_osfhandle(h,m) cygwin_attach_handle_to_fd ("/dev/pipe", -1, (HANDLE)h, 1, GENERIC_READ | GENERIC_WRITE)
  typedef int SOCKET;

#else

  #include <stddef.h> // needed by broken bsds for NULL used in sys/uio.h
  #include <stdlib.h>
  #include <errno.h>

  /* send_fd/recv_fd taken from libptytty */
  #include <sys/types.h>
  #include <sys/uio.h>
  #include <sys/socket.h>

  #ifndef CMSG_SPACE
  # define CMSG_SPACE(len) (sizeof (cmsghdr) + len)
  #endif

  #ifndef CMSG_LEN
  # define CMSG_LEN(len) (sizeof (cmsghdr) + len)
  #endif

#endif

#if defined(WIN32)
/* the rub is this: win32 doesn't seem to have a way to query whether a socket */
/* is non-blocking or not. so we assume it is blocking, make it so if it isn't */
/* and reset it afterwards */
static int
rw (int wr, int fd, char *buf, int len)
{
  u_long nbio = 0;
  int got = 0;

  while (got != len)
    {
      int sze = wr
              ? send ((SOCKET)fd, buf, len, 0)  /* we assume send and recv are macros with arguments */
              : recv ((SOCKET)fd, buf, len, 0); /* to be on the safe side */

      if (sze <= 0)
        {
          if (errno == EAGAIN || errno == WSAEWOULDBLOCK)
            {
              ioctlsocket (fd, FIONBIO, &nbio);
              nbio = 1;
            }
          else
            break;
        }
      else
        got += sze;
    }

  if (nbio)
    ioctlsocket (fd, FIONBIO, &nbio);

  return got == len;
}
#endif

static int
fd_send (int socket, int fd)
{
#if defined(WIN32)
  DWORD pid;
  HANDLE target, h;

  /* seriously, there is no way to query whether a socket is non-blocking?? */
  if (!rw (0, socket, (char *)&pid, sizeof (pid)))
    return 0;

  target = OpenProcess (PROCESS_DUP_HANDLE, FALSE, pid);
  if (!target)
    croak ("AnyEvent::ProcessPool::fd_recv: OpenProcess failed");

  if (!DuplicateHandle ((HANDLE)-1, (HANDLE)_get_osfhandle (fd), target, &h, 0, FALSE, DUPLICATE_SAME_ACCESS))
    croak ("AnyEvent::ProcessPool::fd_recv: DuplicateHandle failed");

  CloseHandle (target);

  if (!rw (1, socket, (char *)&h  , sizeof (h  )))
    return 0;

  return 1;

#else
  void *buf = malloc (CMSG_SPACE (sizeof (int)));

  if (!buf)
    return 0;

  struct msghdr msg;
  struct iovec iov;
  struct cmsghdr *cmsg;
  char data = 0;

  iov.iov_base = &data;
  iov.iov_len  = 1;

  msg.msg_name       = 0;
  msg.msg_namelen    = 0;
  msg.msg_iov        = &iov;
  msg.msg_iovlen     = 1;
  msg.msg_control    = buf;
  msg.msg_controllen = CMSG_SPACE (sizeof (int));

  cmsg = CMSG_FIRSTHDR (&msg);
  cmsg->cmsg_level = SOL_SOCKET;
  cmsg->cmsg_type  = SCM_RIGHTS;
  cmsg->cmsg_len   = CMSG_LEN (sizeof (int));

  *(int *)CMSG_DATA (cmsg) = fd;

  ssize_t result = sendmsg (socket, &msg, 0);

  free (buf);

  return result >= 0;
#endif
}

static int
fd_recv (int socket)
{
#if defined(WIN32)
  DWORD pid = GetCurrentProcessId ();
  HANDLE h;

  if (!rw (1, socket, (char *)&pid, sizeof (pid)))
    return -1;

  if (!rw (0, socket, (char *)&h  , sizeof (h  )))
    return -1;

  return _open_osfhandle ((intptr_t)h, 0);
#else
  void *buf = malloc (CMSG_SPACE (sizeof (int)));

  if (!buf)
    return -1;

  struct msghdr msg;
  struct iovec iov;
  char data = 1;

  iov.iov_base = &data;
  iov.iov_len  = 1;

  msg.msg_name       = 0;
  msg.msg_namelen    = 0;
  msg.msg_iov        = &iov;
  msg.msg_iovlen     = 1;
  msg.msg_control    = buf;
  msg.msg_controllen = CMSG_SPACE (sizeof (int));

  if (recvmsg (socket, &msg, 0) <= 0)
    return -1;

  int fd = -1;

  errno = EDOM;

  if (
     data == 0
#if __OpenBSD__
     && msg.msg_controllen >= CMSG_LEN   (sizeof (int)) /* work around a bug in at least openbsd 4.5 and 4.8 */
#else
     && msg.msg_controllen >= CMSG_SPACE (sizeof (int))
#endif
  ) {
      struct cmsghdr *cmsg = CMSG_FIRSTHDR (&msg);

      if (cmsg->cmsg_level   == SOL_SOCKET
          && cmsg->cmsg_type == SCM_RIGHTS
          && cmsg->cmsg_len  >= CMSG_LEN (sizeof (int)))
        fd = *(int *)CMSG_DATA (cmsg);
    }

  free (buf);

  return fd;
#endif
}

MODULE = IO::FDPass             PACKAGE = IO::FDPass            PREFIX = fd_

PROTOTYPES: DISABLE

int
fd_send (int socket, int fd)

int
fd_recv (int socket)

Revision:	1.3
Committed:	Fri Apr 5 04:32:50 2013 UTC (11 years, 1 month ago) by root
Branch:	MAIN
Changes since 1.2:	+0 -4 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.1	#ifdef __sun
2			#define _XOPEN_SOURCE 1
3			#define _XOPEN_SOURCE_EXTENDED 1
4			#define __EXTENSIONS__ 1
5			#endif
6
7			#include "EXTERN.h"
8			#include "perl.h"
9			#include "XSUB.h"
10
11			#if WIN32
12
13			/* perl probably did this already */
14			#include <windows.h>
15
16			#elif __CYGWIN__
17
18			#include <windows.h>
19			#include <io.h>
20			#include <sys/cygwin.h>
21
22			#define ioctlsocket(a,b,c) ioctl (a, b, c)
23			#define _open_osfhandle(h,m) cygwin_attach_handle_to_fd ("/dev/pipe", -1, (HANDLE)h, 1, GENERIC_READ \| GENERIC_WRITE)
24			typedef int SOCKET;
25
26			#else
27
28			#include <stddef.h> // needed by broken bsds for NULL used in sys/uio.h
29			#include <stdlib.h>
30			#include <errno.h>
31
32			/* send_fd/recv_fd taken from libptytty */
33			#include <sys/types.h>
34			#include <sys/uio.h>
35			#include <sys/socket.h>
36
37			#ifndef CMSG_SPACE
38			# define CMSG_SPACE(len) (sizeof (cmsghdr) + len)
39			#endif
40
41			#ifndef CMSG_LEN
42			# define CMSG_LEN(len) (sizeof (cmsghdr) + len)
43			#endif
44
45			#endif
46
47			#if defined(WIN32)
48			/* the rub is this: win32 doesn't seem to have a way to query whether a socket */
49			/* is non-blocking or not. so we assume it is blocking, make it so if it isn't */
50			/* and reset it afterwards */
51			static int
52			rw (int wr, int fd, char *buf, int len)
53			{
54			u_long nbio = 0;
55			int got = 0;
56
57			while (got != len)
58			{
59			int sze = wr
60	root	1.2	? send ((SOCKET)fd, buf, len, 0) /* we assume send and recv are macros with arguments */
61			: recv ((SOCKET)fd, buf, len, 0); /* to be on the safe side */
62	root	1.1
63			if (sze <= 0)
64			{
65	root	1.2	if (errno == EAGAIN \|\| errno == WSAEWOULDBLOCK)
66	root	1.1	{
67	root	1.2	ioctlsocket (fd, FIONBIO, &nbio);
68	root	1.1	nbio = 1;
69			}
70			else
71			break;
72			}
73			else
74			got += sze;
75			}
76
77			if (nbio)
78	root	1.2	ioctlsocket (fd, FIONBIO, &nbio);
79	root	1.1
80			return got == len;
81			}
82			#endif
83
84			static int
85			fd_send (int socket, int fd)
86			{
87			#if defined(WIN32)
88			DWORD pid;
89			HANDLE target, h;
90
91			/* seriously, there is no way to query whether a socket is non-blocking?? */
92	root	1.2	if (!rw (0, socket, (char *)&pid, sizeof (pid)))
93	root	1.1	return 0;
94
95			target = OpenProcess (PROCESS_DUP_HANDLE, FALSE, pid);
96			if (!target)
97			croak ("AnyEvent::ProcessPool::fd_recv: OpenProcess failed");
98
99			if (!DuplicateHandle ((HANDLE)-1, (HANDLE)_get_osfhandle (fd), target, &h, 0, FALSE, DUPLICATE_SAME_ACCESS))
100			croak ("AnyEvent::ProcessPool::fd_recv: DuplicateHandle failed");
101
102			CloseHandle (target);
103
104	root	1.2	if (!rw (1, socket, (char *)&h , sizeof (h )))
105	root	1.1	return 0;
106
107			return 1;
108
109			#else
110			void *buf = malloc (CMSG_SPACE (sizeof (int)));
111
112			if (!buf)
113			return 0;
114
115			struct msghdr msg;
116			struct iovec iov;
117			struct cmsghdr *cmsg;
118			char data = 0;
119
120			iov.iov_base = &data;
121			iov.iov_len = 1;
122
123			msg.msg_name = 0;
124			msg.msg_namelen = 0;
125			msg.msg_iov = &iov;
126			msg.msg_iovlen = 1;
127			msg.msg_control = buf;
128			msg.msg_controllen = CMSG_SPACE (sizeof (int));
129
130			cmsg = CMSG_FIRSTHDR (&msg);
131			cmsg->cmsg_level = SOL_SOCKET;
132			cmsg->cmsg_type = SCM_RIGHTS;
133			cmsg->cmsg_len = CMSG_LEN (sizeof (int));
134
135			(int )CMSG_DATA (cmsg) = fd;
136
137			ssize_t result = sendmsg (socket, &msg, 0);
138
139			free (buf);
140
141			return result >= 0;
142			#endif
143			}
144
145			static int
146			fd_recv (int socket)
147			{
148			#if defined(WIN32)
149			DWORD pid = GetCurrentProcessId ();
150			HANDLE h;
151
152	root	1.2	if (!rw (1, socket, (char *)&pid, sizeof (pid)))
153	root	1.1	return -1;
154
155	root	1.2	if (!rw (0, socket, (char *)&h , sizeof (h )))
156	root	1.1	return -1;
157
158			return _open_osfhandle ((intptr_t)h, 0);
159			#else
160			void *buf = malloc (CMSG_SPACE (sizeof (int)));
161
162			if (!buf)
163			return -1;
164
165			struct msghdr msg;
166			struct iovec iov;
167			char data = 1;
168
169			iov.iov_base = &data;
170			iov.iov_len = 1;
171
172			msg.msg_name = 0;
173			msg.msg_namelen = 0;
174			msg.msg_iov = &iov;
175			msg.msg_iovlen = 1;
176			msg.msg_control = buf;
177			msg.msg_controllen = CMSG_SPACE (sizeof (int));
178
179			if (recvmsg (socket, &msg, 0) <= 0)
180			return -1;
181
182			int fd = -1;
183
184			errno = EDOM;
185
186			if (
187			data == 0
188			#if __OpenBSD__
189			&& msg.msg_controllen >= CMSG_LEN (sizeof (int)) /* work around a bug in at least openbsd 4.5 and 4.8 */
190			#else
191			&& msg.msg_controllen >= CMSG_SPACE (sizeof (int))
192			#endif
193			) {
194			struct cmsghdr *cmsg = CMSG_FIRSTHDR (&msg);
195
196			if (cmsg->cmsg_level == SOL_SOCKET
197			&& cmsg->cmsg_type == SCM_RIGHTS
198			&& cmsg->cmsg_len >= CMSG_LEN (sizeof (int)))
199			fd = (int )CMSG_DATA (cmsg);
200			}
201
202			free (buf);
203
204			return fd;
205			#endif
206			}
207
208			MODULE = IO::FDPass PACKAGE = IO::FDPass PREFIX = fd_
209
210			PROTOTYPES: DISABLE
211
212			int
213			fd_send (int socket, int fd)
214
215			int
216			fd_recv (int socket)
217