EmbLogic » pipe https://www.emblogic.com/blog Embedded System and ARM Training Tue, 03 Mar 2020 13:00:06 +0000 en-US hourly 1 http://wordpress.org/?v=3.9.1 client,server and process communication via pipes https://www.emblogic.com/blog/09/clientserver-and-process-communication-via-pipes/ https://www.emblogic.com/blog/09/clientserver-and-process-communication-via-pipes/#comments Wed, 24 Sep 2014 14:33:41 +0000 http://www.emblogic.com/blog/?p=11525 Continue reading →]]> RCS file: RCS/server.c,v
Working file: server.c
head: 1.8
branch:
locks: strict
access list:
symbolic names:
keyword substitution: kv
total revisions: 8;    selected revisions: 8
description:
program which act as a server to take the request of client
done:created one child process and a pipe
done:replace the child process with client1.c and send pfd[1] to the client as a command line argument
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revision 1.8
date: 2014/09/24 14:24:48;  author: root;  state: Exp;  lines: +0 -1
change the o/p appearence
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revision 1.7
date: 2014/09/24 14:12:17;  author: root;  state: Exp;  lines: +42 -10
read result from p1,p2,p3
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revision 1.6
date: 2014/09/24 13:08:55;  author: root;  state: Exp;  lines: +17 -3
create one more child process to call process1.c
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revision 1.5
date: 2014/09/24 09:47:40;  author: root;  state: Exp;  lines: +31 -3
read the data from all three client
do switch case to perform different operation
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revision 1.4
date: 2014/09/24 08:38:36;  author: root;  state: Exp;  lines: +6 -6
create 3 child of same parent to call diff-2 client
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revision 1.3
date: 2014/09/24 08:14:31;  author: root;  state: Exp;  lines: +18 -7
crate another pipe for communication between server and process
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revision 1.2
date: 2014/09/24 06:39:04;  author: root;  state: Exp;  lines: +3 -0
read the data through pipe sent by client1
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revision 1.1
date: 2014/09/24 06:22:18;  author: root;  state: Exp;
Initial revision
=============================================================================

RCS file: RCS/client1.c,v
Working file: client1.c
head: 1.5
branch:
locks: strict
access list:
symbolic names:
keyword substitution: kv
total revisions: 5;    selected revisions: 5
description:
client process which will replace the child process
done:create the structure for operand and operation, get the pipe write fd as a command line argument
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revision 1.5
date: 2014/09/24 14:25:10;  author: root;  state: Exp;  lines: +0 -2
change the o/p appearance
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revision 1.4
date: 2014/09/24 09:48:23;  author: root;  state: Exp;  lines: +6 -11
write operater and two operand into pipe
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revision 1.3
date: 2014/09/24 08:15:04;  author: root;  state: Exp;  lines: +3 -1
send the data to server and exit()
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revision 1.2
date: 2014/09/24 06:39:32;  author: root;  state: Exp;  lines: +5 -1
write the data into pipe so that server can read that
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revision 1.1
date: 2014/09/24 06:24:50;  author: root;  state: Exp;
Initial revision
=============================================================================

RCS file: RCS/client2.c,v
Working file: client2.c
head: 1.2
branch:
locks: strict
root: 1.2
access list:
symbolic names:
keyword substitution: kv
total revisions: 2;    selected revisions: 2
description:
create client 2 to do the different mathematical operation
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revision 1.2    locked by: root;
date: 2014/09/24 09:48:57;  author: root;  state: Exp;  lines: +7 -15
write into pipe
—————————-
revision 1.1
date: 2014/09/24 08:39:12;  author: root;  state: Exp;
Initial revision
=============================================================================

RCS file: RCS/client3.c,v
Working file: client3.c
head: 1.3
branch:
locks: strict
access list:
symbolic names:
keyword substitution: kv
total revisions: 3;    selected revisions: 3
description:
create client 3
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revision 1.3
date: 2014/09/24 14:25:40;  author: root;  state: Exp;  lines: +0 -2
change the o/p appearance
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revision 1.2
date: 2014/09/24 09:49:23;  author: root;  state: Exp;  lines: +6 -13
whrite into pipe
—————————-
revision 1.1
date: 2014/09/24 08:39:54;  author: root;  state: Exp;
Initial revision
=============================================================================

RCS file: RCS/process1.c,v
Working file: process1.c
head: 1.3
branch:
locks: strict
access list:
symbolic names:
keyword substitution: kv
total revisions: 3;    selected revisions: 3
description:
this is process program which do the operation on data and return the result
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revision 1.3
date: 2014/09/24 14:25:49;  author: root;  state: Exp;  lines: +0 -2
change the o/p appearance
—————————-
revision 1.2
date: 2014/09/24 14:13:02;  author: root;  state: Exp;  lines: +8 -3
write the result into pipe in interger form
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revision 1.1
date: 2014/09/24 13:09:17;  author: root;  state: Exp;
Initial revision
=============================================================================

RCS file: RCS/process2.c,v
Working file: process2.c
head: 1.2
branch:
locks: strict
access list:
symbolic names:
keyword substitution: kv
total revisions: 2;    selected revisions: 2
description:
process to perform – operation and writing the result back into the pipe
—————————-
revision 1.2
date: 2014/09/24 14:25:52;  author: root;  state: Exp;  lines: +0 -2
change the o/p appearance
—————————-
revision 1.1
date: 2014/09/24 14:14:17;  author: root;  state: Exp;
Initial revision
=============================================================================

RCS file: RCS/process3.c,v
Working file: process3.c
head: 1.2
branch:
locks: strict
access list:
symbolic names:
keyword substitution: kv
total revisions: 2;    selected revisions: 2
description:
process 3 to perform multiplication
—————————-
revision 1.2
date: 2014/09/24 14:25:55;  author: root;  state: Exp;  lines: +0 -2
change the o/p appearance
—————————-
revision 1.1
date: 2014/09/24 14:14:52;  author: root;  state: Exp;
Initial revision
=============================================================================

]]> https://www.emblogic.com/blog/09/clientserver-and-process-communication-via-pipes/feed/ 0 client server https://www.emblogic.com/blog/05/client-server-7/ https://www.emblogic.com/blog/05/client-server-7/#comments Tue, 22 May 2012 12:25:52 +0000 http://emblogic.org/blog/?p=2930 commination done via pipe for single client server…having problems in getting result from the processing client to server……….

]]> https://www.emblogic.com/blog/05/client-server-7/feed/ 0 process https://www.emblogic.com/blog/05/process/ https://www.emblogic.com/blog/05/process/#comments Tue, 22 May 2012 10:49:58 +0000 http://emblogic.org/blog/?p=2872 done with pipe for single client-server-client

]]> https://www.emblogic.com/blog/05/process/feed/ 0 pipe and FIFO…?? https://www.emblogic.com/blog/01/pipe-and-fifo/ https://www.emblogic.com/blog/01/pipe-and-fifo/#comments Thu, 26 Jan 2012 19:01:13 +0000 http://emblogic.org/blog/?p=1745 Continue reading →]]> Is there any mechanism to remove garbage values from the pipe or FIFO.

As we are reading from pipe/FIFO there are some garbage value along with the desired result.
And in FIFO the behaviour is unexpected, as sometime the it read the exact values, sometime some garbage

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