Programming :: Handle A Broken Pipe Exception (SIGPIPE) In FIFO Pipe?
Mar 2, 2011
I've written a simple server in linux used fork to create a FIFO pipe.The server create two FIFO pipe.One for server read data from client and write data to client.Then another pipe for client read data from server and write data to server.When the server read data from a client used server-pipe and then write data to client.But ,if the client no read open the pipe,the server side write will be crashed because of a broken-pipe SIGPIPE. How to check whether the read side is opened?Or,how to catch the SIGPIPE,and then my server will still execute on,not crashed!!
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Jul 12, 2011
What is a pipe? and why a file is a named pipe? I am just learning linux.
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Jul 21, 2011
I am building a python script which works same as SMTP protocol. I have build separate functions in that for each command of SMTP, and after this i have integrated all those functions in a new function named as send_mail(so that i don't have to execute every function separately for every command). Now, when i execute the script for the first time it runs successfully, but for the second time it gives the error of "BROKEN PIPE". I really can't make out how the socket is getting closed.
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Nov 16, 2014
I wrote y bash script that opens YouTube playlist using youtube-dl and VLC applications: the output of youtube-dl is the input of VLC. The only problem is VLC needs to be closed after each playlist item unless I get the error message of the operating system:
"ERROR: unable to write data: [Errno 32] Broken pipe".
I understand the reason but I don't know how to resolve it: it is possible to close previous STDIN of VLC without killing the entire VLC process so that a new youtube-dl instance can connect to the same VLC instance? In short this is my question. The problem is detailed here: Downloading and playing videos and subtitles.
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Apr 10, 2009
I'm doing ping between 2 RH servers through a VPN site2site tunnel and in some times I got in the result pipe 2 and another pipe 3 as I mark it in blue color below.
e.g.
64 bytes from 192.168.1.10: icmp_seq=0 ttl=128 time=0.229 ms
64 bytes from 192.168.1.10: icmp_seq=1 ttl=128 time=0.287 ms
64 bytes from 192.168.1.10: icmp_seq=2 ttl=128 time=0.278 ms
[code]....
What's the difference between pipe 2 and pipe 3 and what's the meaning of it?
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Sep 2, 2010
I am running somes instances of Redis. I want to get Redis stats with following command:
Code:
$ echo "info" | nc <server_IP> <port>
but sometime it returns nothing. The first thing come to my mind is broken pipe or something like this. I always get the result if telnet to Redis and typing 'info' command. I also try pipe viewer to monitor the progress of data but it didn't help:
Code:
$ echo "info" | pv | nc <server_IP> <port>
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Jul 15, 2010
We are facing broken pipe exception while connecting to SMPP gateway through TCP/IP.on RHEL4 It is coming till we restart the application. Below is the exception we are getting. java.net.SocketException: Broken pipe
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Apr 11, 2010
I connect to our server by ssh, default ssh client on Debian system.when I run a command that has large output on stdout (on shell) my connection is lost and I get error: "Write failed: Broken pipe"Unfortunate on our server there is limitation for connection per hour!
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Apr 10, 2009
my net worked HP printer will not print-broken pipe - this started after I had to switch off the printer at the mains in order to attend to a paper jam. Now it will not print apart from a test page. I am using Fedora 10 and the device info is "hp:/net/Officejet_Pro_L7500?ip=192.168.0.4"
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Mar 2, 2010
I have installed a LAMP server (Debian Lenny + Apache2 + PHP Version 5.3.1-0.dotdeb.1). On this machine, my web application (PHP + MySQL) exists in 2 flavours:
- Dev
- Prod
In /etc/apache2/sites-available, I have ims & ims-dev, one for each instance. Their contents are identical in terms of settings, except for the paths (dev/prod):
Code:
<VirtualHost *:80>
ServerAdmin admin@domain.com
ServerName ims.domain.com
ServerAlias ims.domain.com
[code]....
why this difference when the settings are strictly identical? Do I need to add EnableSendfile off in my conf files to stop that?
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Apr 20, 2011
I have script which does file locking via flock and then writing it's pid into that file. It perfectly works being run by hand in terminal, running under cron on Debian, but somehow fails being run under cron on Centos 5.6. Script part and straced outputs are below.
bash code:
#setting lock
mylog "setting lockfile $LOCKFILE"
exec 200<> $LOCKFILE
[code]....
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Jul 22, 2010
I'm following the "The Perfect Server - Fedora12 x86_64 [ISPConfig 3]" instructions and I am encountering an error when trying to build the rpm for courier-imap (from page 4 of the HOWTO).
The command I run is:
Code:
rpmbuild -ta courier-imap-4.6.0.tar.bz2
The error is below:
Code:
INFO: LOGIN, user=confmdtest, ip=[127.0.0.1], port=[0], protocol=SMAP1
INFO: LOGOUT, user=confmdtest, ip=[127.0.0.1], headers=0, body=0, rcvd=26, sent=610, time=0
sort: fflush failed: standard output: Broken pipe
[code]....
RPM build errors: Bad exit status from /var/tmp/rpm-tmp.85697 (%build)
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Apr 19, 2010
I move a page from a server in SuSe to Debian and this script was working well but when I move the page to a Debian base server it is sending in the logs the following message:
cat: write error: Broken pipe, referer: [URL]
The cgi does the following, read a db file plain text that repeat each 15 lines an information where to look the seraching info. if it is there sends to the output the 15 lines block. but it was not sending errors in suse distro, does anybody knows why the cat's line are sending "cat: write error: Broken pipe," if I am not writing or making a pipe with ">" to none file.
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Apr 23, 2010
Unpacking replacement ffmpeg ... dpkg: error processing /var/cache/apt/archives/ffmpeg_5%3a0.5.1+svn20100411-0.0_i386.deb (--unpack): trying to overwrite '/usr/share/ffmpeg/libx264-ipod640.ffpreset', which is also in package libavcodec52 4:0.5.1-3 dpkg-deb: subprocess paste killed by signal (Broken pipe) Errors were encountered while processing: /var/cache/apt/archives/ffmpeg_5%3a0.5.1+svn20100411-0.0_i386.deb E: Sub-process /usr/bin/dpkg returned an error code (1)
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Apr 13, 2010
In shell, I execute "./ffmpeg -f h264 - | xxx"
Now I hope use execl function to execute above operations,
I call execl("/bin/sh", "sh", "-c", "./ffmpeg -f h264 - | xxx");
but ffmpeg doesn't work, it seems that "|" pipe don't work.
how could I solve this?
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Aug 11, 2010
I understand that $! is the PID of a command. For example:
Code: #!/bin/bash
myprogram &
echo "PID of myprogram is $!"
I'd like to send the output of "myprogram" to both console and to a log file using the "tee" command but I also want to store the PID of "myprogam". Something like this:
Code: #!/bin/bash
myprogram | tee ./logfile &
echo "PID of myprogram is $!"
The problem is that $! is now the PID of "tee" rather than the PID of "myprogram".
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Feb 16, 2011
I am trying to automate some directory naming when we're manually running some scripts and are using tee to direct the output to a file (log). Right now this is what we do
Code:
./some_script.sh 2>&1 | tee /home/user/some_dir/logs/manual/some_script_20110216_1628.log
As a matter of laziness and keeping the log files consistently named, I'd like to create a function to pipe it to so that it's doing all the naming How I envision the command running
Code:
./some_script.sh 2>&1 | myfunc
And what the logfile name should look like (and in the right directory)
Code:
some_script_20110216-1628.log
I was thinking of adding a function to our profile to handle this. Just in testing I was trying to stream line right on the command line, but I'm having some difficulty in getting the name of the script that is pushing data over the pipe. Here is what I've tried
Code:
./some_script.sh 2>&1 | tee $(cd ../logs/manual; pwd)/$0_$(date +%Y%m%d)-$(date +%H%M).log
but that created a file named
"bash_20110216-1628.log"
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Apr 5, 2011
For instance, suppose I want to pipe the output of ps -A to a gtkdialog table.
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May 3, 2011
I want to pipe the output of ls in a folder to a file (lets call it test.txt) but when i do so, but when i do ls > test.txt in test.txt there is also test.txt (logical
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Mar 24, 2011
I want to have the output of a program go to 2 different files but not going to standard out. Is there a way to do this in bash? I know that in Z shell its really easy. omething like: Code: echo "test" >> file1 >> file2 Would work. But in Bash it doesn't seem that easy. I know that tee will send the output to 2 files but it also sends it to STDOUT.Something like:Code: echo "test" | tee -a file1 file2 Would put the word "test" in file1, file2, and STDOUT. Is there a way to just send the output to file1 and file2?
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Mar 14, 2010
I have a small program that reads stdin from a pipe using fgets. Now fgets blocks for the first line but after that it will not block.
The code, my_echo.c -
int main(int argc, char **argv) { char buf [2000] ;
char* pc ; printf("hello ") ; while (1)
{ buf[0] = (char) 0 ;
pc = fgets(buf, sizeof(buf), stdin);
if (pc != NULL) printf("%s ",buf); } return 0; }
How its called
* In terminal window 1: ./my_echo < my_fifo
* In terminal window 2: echo "1234" > my_fifo
* In terminal window 1: prints hello then 1234.
* Checking with ksysguard or top shows that my_echo is consuming 40% of CPU time.
Adding a few printf's shows that the gets is not blocking and returns a null pointer.
* In terminal window 2: echo "qwerty" > my_fifo
* In terminal window 1 qwerty prints.
I want a read function that does in fact block so my program does not tie up CPU time, read does not block.
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Jan 24, 2009
I'm looking for a way to detect whether or not a program has been called from pipe, e.g.
Code:
whatever | my_program
versus simply just being exectuated directly:
Code:
my_program
Why? In the first case, I want to run the program non-interactively, and in the latter case I want to print out user-friendly messages. I've been thinking along the lines of some check I haven't yet found, like:
Code:
if( stream_buffer_is_not_empty() )
print_interactive_messages();
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Oct 13, 2010
If a process forks its child and communicate with the child using pipe, do closing the write end of the pipe and terminating the writing process have the same effect?
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May 10, 2010
I am having a truly bizarre problem when trying to set up my sheeva plug as a backup server. I have four users (one for each member of my family) that I want to give permission to ssh in (well, sftp in but they're essentially the same) and backup to an external harddrive.
My user works perfectly well and has done since I got the plug. So does a transmission user I set up to run the transmission daemon. With the other three users, however, I get the following error after SSH asks for the user's password:
Code:
Write failed: Broken pipe
This happens whether I try locally or over my network. I haven't been able to find a solution to it at all. I've made sure that /bin/bash was set as the shell and that the home directory is writeable with the correct permissions (ls -al /home):
Code:
drwxr-xr-x 7 root root 4096 Dec 21 19:25 .
drwxr-xr-x 21 root root 4096 Dec 17 19:27 ..
[code]...
The alternative for me would be to use netatalk and AFP but the problem is that there is no native support for AFP and so things like d�ja dup backup may not be able to mount the afp drive...
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Jul 18, 2011
Whenever I put ssh into remote machine am getting the following messages. Write Failed: Broken Pipe (After logged into that machine ) Read Socket Failed: Connection reset by peer (While trying to log in ) Also known_hosts file is changed frequently.
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Feb 9, 2010
which cropped up today after no changes to the system: I can successfully ssh into my ubuntu 64-bit 9.10 machine (via OS X with iTerm), but after about 30 seconds, the connection drops with the message "Connection reset by peer Connection to xx.xx.xx.xx closed".
If I then try to immediately ssh back in I get: "Write failed: Broken pipe". If I try to immediately ping the machine instead, I cannot ping it until the ~10th try. Eventually I can log back in again, only to be kicked off after between 5 and 60 seconds. I called the network people and their are no known issue right now with networking. The networking on the ubuntu machine is otherwise fine, it seems. In the /var/log/auth.log file, it simple says:
Quote:
Feb 9 14:19:20 harriet sshd[4134]: Accepted password for xxx from xx.xx.xx.xx port 55105 ssh2
Feb 9 14:19:20 harriet sshd[4134]: pam_unix(sshd:session): session opened for user xxx by (uid=0)
Feb 9 14:19:28 harriet sshd[4046]: pam_unix(sshd:session): session closed for user xxx
The solution I come across to a similar problem is to add a "ClientAwakeInterval" number to sshdconfig, but this (as expected) doesn't fix my problem.
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Oct 20, 2010
how to pipe the current directory listing into sort so that the output is the date in descending order (primary sort key). If there are multiple entries with the same date, I'd like the times sorted in ascending order. It seems simple but for some reason this isn't working:
ls -l | sort -k 6r -k 7
For some reason it doesn't seem to ever get to the second sort key when using column 6 (last modified date).
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Apr 3, 2010
I understand that the linux pipe is a buffer and that any data written to it will stay there until it is read, and if the max capacity of the buffer is reached, any additional writes will block (by default).
HOWEVER, the behavior of the pipeline below suggest that the write operations are buffered/cached before ever being written to the pipe on the client side here is write.sh, which creates 1000 byte string and writes it 100 times to stdout... the idea being that it'll block as soon as the 64kb linux pipe size is reached:
[Code]...
This is not what I was expecting: I was expected that once the capacity was reached, any reads would be followed immediately by a write to take advantage of the freed space. Instead, the blocked write operation seems to wait for some random amount of time/space to free until it unblocks and writes.
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Aug 12, 2010
I've written a usb device driver and a program that sends and receives data over the bulk pipe. The read function sometimes returnsI'm reading an unknown amount of data. However, using a usb tracker I can see that the correct data is being sent.The error only occurs sometimes.I expect that the read function is told to read more data that it receives it would fail and return -1, however if this was the case then every read call would fail.
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Apr 22, 2010
My question deals with me creating a name pipe (file) in the my /group directory called chat.I then have to write a script to read from the named pipe and save data into a file called chat.log until the words End of File are passed to the program.
-When I created the named pipe file (chat) I used the mknod chat p command..Is this the correct command to create a named pipe file? -Then I'm having trouble with my script and how to make it run until the words End of File are entered in. This is what I have so far.
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