ID: 32979
User updated by: mjpph at stardust dot fi
Reported By: mjpph at stardust dot fi
Status: Open
Bug Type: Network related
Operating System: Linux (Fedora Core 3)
PHP Version: 5CVS-2005-05-08 (dev)
Assigned To: wez
New Comment:
The latter has actual ip which I intended to not show, but anyway I had
to use actual IP on the other test machine as it doesn't run it's own
SMTP. Using the actual ip instead of the 127.0.0.1 didn't have any
impact on the non-working machines though.
Previous Comments:
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[2005-05-26 16:54:38] mjpph at stardust dot fi
New info, I was able to get the reproduce code to actually work as it's
intended on a Fedora Core 2 machine with PHP 5.0.0RC3 (cgi) (built: Jun
10 2004 16:56:32). Here's strace of it:
read(3, "<?\n$c = stream_socket_client(\"tc"..., 8192) = 199
read(3, "", 4096) = 0
read(3, "", 8192) = 0
close(3) = 0
munmap(0x2a97e16000, 4096) = 0
socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP) = 3
close(3) = 0
socket(PF_INET, SOCK_STREAM, IPPROTO_IP) = 3
fcntl(3, F_GETFL) = 0x2 (flags
O_RDWR|O_LARGEFILE)
fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0
connect(3, {sa_family=AF_INET, sin_port=htons(25),
sin_addr=inet_addr("83.145.20
0.2")}, 16) = -1 EINPROGRESS (Operation now in progress)
select(4, [3], [3], [3], {60, 0}) = 1 (out [3], left {60, 0})
getsockopt(3, SOL_SOCKET, SO_ERROR, [17179869184], [4]) = 0
fcntl(3, F_SETFL, O_RDWR) = 0
select(4, [3], [], [], {0, 5000}) = 0 (Timeout)
select(4, [3], [], [], {0, 5000}) = 1 (in [3], left {0, 5000})
select(4, [3], NULL, NULL, {60, 0}) = 1 (in [3], left {60, 0})
at this point the stream_select returns as intended and script ends.
The reproduce code DOESN'T work with several machines running Fedora
Core 3 by using 5.0.4 as well as with 200505260030 dated snapshot.
stream_select simply doesn't give me anything. Platform is Fedora Core
3 x86_64 under dual xeon 3.2ghz (Nocona, EM64T) with kernel
2.6.11-1.14_FC3smp on the machines that don't return stream_select() as
it should.
------------------------------------------------------------------------
[2005-05-26 16:42:54] mjpph at stardust dot fi
I used the reproduce code to connect to my own SMTP server, which by
using standard socket functions, telnet or any other method instantly
outputs the welcome message when I connect. Just add IP+Port to some
SMTP server and it'll work for the test.
Here's the strace:
read(3, "<?\n$c = stream_socket_client(\"tc"..., 8192) = 220
read(3, "", 4096) = 0
read(3, "", 8192) = 0
close(3) = 0
munmap(0x2aaaad2e0000, 4096) = 0
socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP) = 3
close(3) = 0
socket(PF_INET, SOCK_STREAM, IPPROTO_IP) = 3
fcntl(3, F_GETFL) = 0x2 (flags
O_RDWR|O_LARGEFILE)
fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0
connect(3, {sa_family=AF_INET, sin_port=htons(25),
sin_addr=inet_addr("127.0.0.1")}, 16) = -1 EINPROGRESS (Operation now
in progress)
poll([{fd=3, events=POLLIN|POLLOUT|POLLERR|POLLHUP, revents=POLLOUT}],
1, 60000) = 1
getsockopt(3, SOL_SOCKET, SO_ERROR, "\0\0\0\0", [12884901892]) = 0
fcntl(3, F_SETFL, O_RDWR) = 0
select(4, [3], [], [], {0, 5000}) = 1 (in [3], left {0, 1000})
select(4, [3], [], [], {0, 5000}) = 1 (in [3], left {0, 5000})
select(4, [3], [], [], {0, 5000}) = 1 (in [3], left {0, 5000})
select(4, [3], [], [], {0, 5000}) = 1 (in [3], left {0, 5000})
select(4, [3], [], [], {0, 5000}) = 1 (in [3], left {0, 5000})
.. it continues like this until I kill the script. The stream_select()
never returns anything. If I do fgets() instead of the stream_select()
it returns the SMTP welcome instantly.
------------------------------------------------------------------------
[2005-05-26 03:05:44] [EMAIL PROTECTED]
Worked for me just the other week.
You'll need to convince me with a short self-contained test and strace
output to prove it.
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[2005-05-09 09:51:34] mjpph at stardust dot fi
No I used http only as an examply not thinking that it doesn't actually
output anything straight away.
I used the example code on several services that output information
straight from connect without needing any input from the client. For
example port 25 welcome message and several others. Telnet straight
away you get a welcome. Use only fgets, you get a welcome. Use the
example code, you get nothing. Didn't try anything which actually
closes the connection after the output, as this isn't the case with my
own implementation either and shouldn't be a requirement anyway.
The case is always the same, fgets would get input straight away but
stream_select stays dead no matter how many times it loops and waits.
Setting the stream to blocking or non-blocking mode has no effect on
stream_select's behaviour on this case. The data in the buffer just
stays there and stream_select is completely ignorant about it. So, the
read wouldn't block (as I know there is data pending), but even despite
that stream_select returns 0 changed streams always. So it thinks that
read would block, in reality, it doesn't.
Partly unrelated: I have this code in a script which also selects
stdin. The stdin select works as expected, the stream_socket selecting
select doesn't. I had a perfectly working implementation with
socket-based functions which stalled at the selects right after I
changed to stream_socket-based functions.
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[2005-05-09 01:26:32] [EMAIL PROTECTED]
Is the server end of the socket talking http?
If not, does it send data to the client immediately upon client
connection (without expecting data from the client first)?
If not, stream_select() is working precisely as it should.
Also note that stream_select() tells you only if a read or write would
not block, not whether there actually is data pending.
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the rest of the comments, please view the bug report online at
http://bugs.php.net/32979
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