| … | |
… | |
| 4 | |
4 | |
| 5 | =head1 SYNOPSIS |
5 | =head1 SYNOPSIS |
| 6 | |
6 | |
| 7 | use IO::FDPass; |
7 | use IO::FDPass; |
| 8 | |
8 | |
|
|
9 | IO::FDPass::send fileno $socket, fileno $fh_to_pass |
|
|
10 | or die "send failed: $!"; |
|
|
11 | |
|
|
12 | my $fd = IO::FDPass::recv fileno $socket; |
|
|
13 | $fd >= 0 or die "recv failed: $!"; |
|
|
14 | |
| 9 | =head1 DESCRIPTION |
15 | =head1 DESCRIPTION |
| 10 | |
16 | |
| 11 | This small low-level module only has one purpose: pass a file descriptor |
17 | This small low-level module only has one purpose: pass a file descriptor |
| 12 | to another process, using a unix domain socket (on POSIX systems) or any |
18 | to another process, using a (streaming) unix domain socket (on POSIX |
| 13 | socket (on WIN32 systems). |
19 | systems) or any (streaming) socket (on WIN32 systems). |
| 14 | |
20 | |
| 15 | =head1 FUNCTIONS |
21 | =head1 FUNCTIONS |
| 16 | |
22 | |
| 17 | =over 4 |
23 | =over 4 |
| 18 | |
24 | |
| 19 | =cut |
25 | =cut |
| 20 | |
26 | |
| 21 | package IO::FDPass; |
27 | package IO::FDPass; |
| 22 | |
28 | |
| 23 | BEGIN { |
29 | BEGIN { |
| 24 | $VERSION = '0.0'; |
30 | $VERSION = 0.2; |
| 25 | |
31 | |
| 26 | require XSLoader; |
32 | require XSLoader; |
| 27 | XSLoader::load (__PACKAGE__, $VERSION); |
33 | XSLoader::load (__PACKAGE__, $VERSION); |
| 28 | } |
34 | } |
| 29 | |
35 | |
| … | |
… | |
| 67 | |
73 | |
| 68 | =back |
74 | =back |
| 69 | |
75 | |
| 70 | =head1 PORTABILITY NOTES |
76 | =head1 PORTABILITY NOTES |
| 71 | |
77 | |
| 72 | This module has been tested on NetBSD 6, OS X 10.5, Windows 2000 |
78 | This module has been tested on GNU/Linux x86 and amd64, NetBSD 6, OS X |
| 73 | ActivePerl 5.10, Solaris 10, OpenBSD 4.4, 4.5, 4.8 and 5.0, DragonFly |
79 | 10.5, Windows 2000 ActivePerl 5.10, Solaris 10, OpenBSD 4.4, 4.5, 4.8 and |
| 74 | BSD, FreeBSD 7, 8 and 9, Windows 7 + ActivePerl 5.16.3 32 and 64 bit |
80 | 5.0, DragonFly BSD, FreeBSD 7, 8 and 9, Windows 7 + ActivePerl 5.16.3 32 |
| 75 | and Strawberry Perl 5.16.3 32 and 64 bit, and found to work, although |
81 | and 64 bit and Strawberry Perl 5.16.3 32 and 64 bit, and found to work, |
| 76 | ActivePerl 32 bit needed a newer MinGW version (that supports XP and |
82 | although ActivePerl 32 bit needed a newer MinGW version (that supports XP |
| 77 | higher). |
83 | and higher). |
| 78 | |
84 | |
| 79 | However, windows doesn't support asynchronous file descriptor passing, so |
85 | However, windows doesn't support asynchronous file descriptor passing, so |
| 80 | C<send> and C<recv> will have to "rendezvous", that is, they have to wait |
86 | the source process must still be around when the destination process wants |
| 81 | for each other. Therefore, on windows, it's advisable to run them at the |
87 | to receive the file handle. Also, if the target process fails to fetch the |
| 82 | same time to avoid any unnecessary delays. |
88 | handle, the handle will leak, so never do that. |
| 83 | |
89 | |
| 84 | Also, on windows, the passing process must give the receiving process the |
90 | Also, on windows, the receiving process must have the PROCESS_DUP_HANDLE |
| 85 | PROCESS_DUP_HANDLE access right for this module to work. |
91 | access right on the sender process for this module to work. |
|
|
92 | |
|
|
93 | Cygwin is not supported at the moment, as file descriptor passing in |
|
|
94 | cygwin is not supported, and cannot be rolled on your own as cygwin has no |
|
|
95 | (working) method of opening a handle as fd. That is, it has one, but that |
|
|
96 | one isn't exposed to programs, and only used for stdin/out/err. Sigh. |
| 86 | |
97 | |
| 87 | =head1 OTHER MODULES |
98 | =head1 OTHER MODULES |
| 88 | |
99 | |
| 89 | At the time of this writing, the author of this module was aware of two |
100 | At the time of this writing, the author of this module was aware of two |
| 90 | other file descriptor passing modules on CPAN: L<Linux::FDPasser> and |
101 | other file descriptor passing modules on CPAN: L<Linux::FDPasser> and |
