EmbLogic » Ritu Gupta 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 write routine for character driver https://www.emblogic.com/blog/12/write-routine-for-character-driver/ https://www.emblogic.com/blog/12/write-routine-for-character-driver/#comments Tue, 16 Dec 2014 08:15:01 +0000 http://www.emblogic.com/blog/?p=11917 Continue reading →]]> RCS file: write_dev.c,v
Working file: write_dev.c
head: 1.37
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total revisions: 37; selected revisions: 37
description:
start dev_write()
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revision 1.37 locked by: root;
date: 2014/12/15 04:29:54; author: root; state: Exp; lines: +11 -7
change condition for if statement for writing data to kernel buffer
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revision 1.36
date: 2014/12/13 11:18:22; author: root; state: Exp; lines: +1 -1
perform checking
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revision 1.35
date: 2014/12/10 21:52:14; author: root; state: Exp; lines: +6 -0
add NULL to the last quantum.
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revision 1.34
date: 2014/12/09 02:55:05; author: root; state: Exp; lines: +3 -3
*** empty log message ***
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revision 1.33
date: 2014/12/09 02:53:14; author: root; state: Exp; lines: +8 -2
do mapping for read with read_dev()
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revision 1.32
date: 2014/12/09 02:30:39; author: root; state: Exp; lines: +1 -1
change prototype for write_data()
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revision 1.31
date: 2014/12/09 02:28:25; author: root; state: Exp; lines: +27 -17
*** empty log message ***
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revision 1.30
date: 2014/12/09 02:09:07; author: root; state: Exp; lines: +4 -4
*** empty log message ***
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revision 1.29
date: 2014/12/09 02:04:50; author: root; state: Exp; lines: +5 -5
*** empty log message ***
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revision 1.28
date: 2014/12/09 02:03:12; author: root; state: Exp; lines: +5 -4
*** empty log message ***
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revision 1.27
date: 2014/12/09 01:05:25; author: root; state: Exp; lines: +11 -4
modify write program
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revision 1.26
date: 2014/12/07 22:06:36; author: root; state: Exp; lines: +3 -2
*** empty log message ***
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revision 1.25
date: 2014/12/07 22:05:08; author: root; state: Exp; lines: +1 -1
*** empty log message ***
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revision 1.24
date: 2014/12/07 22:04:12; author: root; state: Exp; lines: +1 -1
*** empty log message ***
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revision 1.23
date: 2014/12/07 22:01:45; author: root; state: Exp; lines: +1 -1
*** empty log message ***
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revision 1.22
date: 2014/12/07 21:58:59; author: root; state: Exp; lines: +6 -7
*** empty log message ***
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revision 1.21
date: 2014/12/07 17:59:51; author: root; state: Exp; lines: +44 -7
define func write_data()
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revision 1.20
date: 2014/12/07 17:35:43; author: root; state: Exp; lines: +1 -0
*** empty log message ***
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revision 1.19
date: 2014/12/07 17:34:47; author: root; state: Exp; lines: +1 -1
remove error
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revision 1.18
date: 2014/12/07 17:33:05; author: root; state: Exp; lines: +32 -0
write func create_quantum()
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revision 1.17
date: 2014/12/07 17:19:14; author: root; state: Exp; lines: +9 -2
check the success condition for func create_qset()
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revision 1.16
date: 2014/12/07 17:15:30; author: root; state: Exp; lines: +12 -0
write func to create qset array
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revision 1.15
date: 2014/12/07 10:23:26; author: root; state: Exp; lines: +1 -2
find out number of quantum to create
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revision 1.14
date: 2014/12/07 10:21:44; author: root; state: Exp; lines: +2 -2
remove error
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revision 1.13
date: 2014/12/07 10:19:06; author: root; state: Exp; lines: +18 -9
write base code for fun create_qset
write fun create_scullqset()
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revision 1.12
date: 2014/12/06 10:43:41; author: root; state: Exp; lines: +1 -0
*** empty log message ***
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revision 1.11
date: 2014/12/06 10:38:44; author: root; state: Exp; lines: +9 -2
find number of quantum to create to store data
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revision 1.10
date: 2014/12/06 10:24:00; author: root; state: Exp; lines: +1 -1
*** empty log message ***
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revision 1.9
date: 2014/12/06 10:19:05; author: root; state: Exp; lines: +1 -1
remove error
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revision 1.8
date: 2014/12/06 10:17:15; author: root; state: Exp; lines: +1 -1
*** empty log message ***
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revision 1.7
date: 2014/12/06 10:14:56; author: root; state: Exp; lines: +37 -0
define function create_qset to create qset used to store data
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revision 1.6
date: 2014/12/06 09:11:13; author: root; state: Exp; lines: +4 -0
get the value of no of qsets used to write data
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revision 1.5
date: 2014/12/06 09:10:11; author: root; state: Exp; lines: +1 -0
*** empty log message ***
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revision 1.4
date: 2014/12/06 09:06:59; author: root; state: Exp; lines: +7 -0
declare a variable size to find size of qset
declare variable noqset to store the value of no of qsets used to write the provided data
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revision 1.3
date: 2014/12/06 08:19:18; author: root; state: Exp; lines: +0 -4
*** empty log message ***
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revision 1.2
date: 2014/12/06 08:07:02; author: root; state: Exp; lines: +1 -1
*** empty log message ***
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revision 1.1
date: 2014/12/06 07:51:10; author: root; state: Exp;
Initial revision
=============================================================================

]]> https://www.emblogic.com/blog/12/write-routine-for-character-driver/feed/ 0 Trim() for character driver https://www.emblogic.com/blog/12/trim-for-character-driver/ https://www.emblogic.com/blog/12/trim-for-character-driver/#comments Tue, 16 Dec 2014 08:13:29 +0000 http://www.emblogic.com/blog/?p=11915 Continue reading →]]> RCS file: trim.c,v
Working file: trim.c
head: 1.14
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root: 1.14
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keyword substitution: kv
total revisions: 14; selected revisions: 14
description:
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revision 1.14 locked by: root;
date: 2014/12/13 11:18:22; author: root; state: Exp; lines: +13 -2
perform checking
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revision 1.13
date: 2014/12/13 10:42:16; author: root; state: Exp; lines: +1 -1
*** empty log message ***
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revision 1.12
date: 2014/12/13 09:18:31; author: root; state: Exp; lines: +3 -20
debuging
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revision 1.11
date: 2014/12/13 09:10:37; author: root; state: Exp; lines: +4 -4
*** empty log message ***
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revision 1.10
date: 2014/12/13 08:51:22; author: root; state: Exp; lines: +2 -2
*** empty log message ***
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revision 1.9
date: 2014/12/13 08:12:14; author: root; state: Exp; lines: +1 -1
*** empty log message ***
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revision 1.8
date: 2014/12/13 08:09:33; author: root; state: Exp; lines: +31 -23
modify trim
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revision 1.7
date: 2014/12/12 11:41:24; author: root; state: Exp; lines: +2 -2
*** empty log message ***
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revision 1.6
date: 2014/12/12 11:22:46; author: root; state: Exp; lines: +3 -2
modify trim
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revision 1.5
date: 2014/12/12 11:13:36; author: root; state: Exp; lines: +3 -3
modify trim
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revision 1.4
date: 2014/12/11 10:19:24; author: root; state: Exp; lines: +3 -1
*** empty log message ***
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revision 1.3
date: 2014/12/11 09:36:47; author: root; state: Exp; lines: +30 -1
write trim()
kfree the quantum and qset
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revision 1.2
date: 2014/12/09 01:53:00; author: root; state: Exp; lines: +1 -1
change prototype for trim()
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revision 1.1
date: 2014/12/09 01:50:41; author: root; state: Exp;
Initial revision
=============================================================================

]]> https://www.emblogic.com/blog/12/trim-for-character-driver/feed/ 0 open() routine for character driver https://www.emblogic.com/blog/12/open-routine-for-character-driver/ https://www.emblogic.com/blog/12/open-routine-for-character-driver/#comments Tue, 16 Dec 2014 08:12:10 +0000 http://www.emblogic.com/blog/?p=11913 Continue reading →]]> RCS file: open_dev.c,v
Working file: open_dev.c
head: 1.12
branch:
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root: 1.12
access list:
symbolic names:
keyword substitution: kv
total revisions: 12; selected revisions: 12
description:
open function for character driver is declared in this file
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revision 1.12 locked by: root;
date: 2014/12/11 09:36:47; author: root; state: Exp; lines: +1 -1
modify proototype for trim
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revision 1.11
date: 2014/12/09 01:53:00; author: root; state: Exp; lines: +1 -1
change prototype for trim()
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revision 1.10
date: 2014/12/09 01:13:22; author: root; state: Exp; lines: +1 -1
*** empty log message ***
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revision 1.9
date: 2014/12/09 01:05:25; author: root; state: Exp; lines: +5 -0
modify write program
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revision 1.8
date: 2014/12/07 23:30:36; author: root; state: Exp; lines: +1 -1
*** empty log message ***
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revision 1.7
date: 2014/12/07 23:29:53; author: root; state: Exp; lines: +3 -2
*** empty log message ***
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revision 1.6
date: 2014/12/06 08:05:08; author: root; state: Exp; lines: +2 -2
*** empty log message ***
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revision 1.5
date: 2014/12/05 02:06:34; author: root; state: Exp; lines: +1 -1
*** empty log message ***
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revision 1.4
date: 2014/12/05 02:04:07; author: root; state: Exp; lines: +1 -1
*** empty log message ***
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revision 1.3
date: 2014/12/02 11:52:28; author: root; state: Exp; lines: +20 -0
declared a local variable of type struct ScullDev to point to memory of device
use container_of to map i_cdev of struct inode with c_dev of struct ScullDev
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revision 1.2
date: 2014/12/02 10:55:58; author: root; state: Exp; lines: +4 -2
there was an error in printk() statement
remove that error
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revision 1.1
date: 2014/12/02 10:50:45; author: root; state: Exp;
Initial revision
=============================================================================

]]> https://www.emblogic.com/blog/12/open-routine-for-character-driver/feed/ 0 Registering and unregistering the character driver into and from the kernel. https://www.emblogic.com/blog/11/rcs-file-for-character-driver-upto-registering-and-unregistering-the-driver-into-and-from-the-kernel/ https://www.emblogic.com/blog/11/rcs-file-for-character-driver-upto-registering-and-unregistering-the-driver-into-and-from-the-kernel/#comments Tue, 25 Nov 2014 19:15:01 +0000 http://www.emblogic.com/blog/?p=11890 Continue reading →]]> RCS file: ./header.h,v
Working file: ./header.h
head: 1.2
branch:
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root: 1.2
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symbolic names:
keyword substitution: kv
total revisions: 2; selected revisions: 2
description:
this is the header file for character driver
in this file i include kernel header files
included linux/kernel.h
included linux/init.h
included linux/fs.h
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revision 1.2 locked by: root;
date: 2014/11/25 17:33:53; author: root; state: Exp; lines: +2 -0
include file linux/kdev_t.h
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revision 1.1
date: 2014/11/25 06:17:14; author: root; state: Exp;
Initial revision
=============================================================================

RCS file: ./declaration.h,v
Working file: ./declaration.h
head: 1.3
branch:
locks: strict
root: 1.3
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symbolic names:
keyword substitution: kv
total revisions: 3; selected revisions: 3
description:
this is the file in which all the declaration for kernel module is made
included file linux/module.h
declare license name
declare author namee
give description for the module
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revision 1.3 locked by: root;
date: 2014/11/25 17:33:53; author: root; state: Exp; lines: +1 -4
declared variable minor_no of type int
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revision 1.2
date: 2014/11/25 17:20:57; author: root; state: Exp; lines: +1 -0
declared extern variable dev of type dev_t
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revision 1.1
date: 2014/11/25 06:17:14; author: root; state: Exp;
Initial revision
=============================================================================

RCS file: ./init.c,v
Working file: ./init.c
head: 1.4
branch:
locks: strict
root: 1.4
access list:
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keyword substitution: kv
total revisions: 4; selected revisions: 4
description:
this is the file which exicuted after inserting module to the kernel
resistering the module using register_chrdev()
get the major number for module
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revision 1.4 locked by: root;
date: 2014/11/25 17:33:53; author: root; state: Exp; lines: +4 -3
get major and minor number from the var dev of type dev_t using macros MAJOR() and MINOR()
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revision 1.3
date: 2014/11/25 17:20:57; author: root; state: Exp; lines: +7 -5
remove the use of register_chrdev function for registering device into the kernel
register driver into the kerrnel using alloc_chrdev_region()
declared variable dev of type dev_t
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revision 1.2
date: 2014/11/25 06:24:41; author: root; state: Exp; lines: +2 -2
change priority for printing messages in ring buffer for kernel
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revision 1.1
date: 2014/11/25 06:17:14; author: root; state: Exp;
Initial revision
=============================================================================

RCS file: ./exit_fun.c,v
Working file: ./exit_fun.c
head: 1.6
branch:
locks: strict
root: 1.6
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symbolic names:
keyword substitution: kv
total revisions: 6; selected revisions: 6
description:
this file executes after rmmod
unregister module using unregister_chrdev
define cleanup function
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revision 1.6 locked by: root;
date: 2014/11/25 17:33:53; author: root; state: Exp; lines: +1 -1
print major and minor number into the kernel buffer
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revision 1.5
date: 2014/11/25 17:27:25; author: root; state: Exp; lines: +1 -1
remove error
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revision 1.4
date: 2014/11/25 17:20:57; author: root; state: Exp; lines: +2 -2
remove the use of unregister_chrdev() for unregisterning driver from the kernel
unregister driver from the kernel using unregister_chrdev_region()
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revision 1.3
date: 2014/11/25 06:24:41; author: root; state: Exp; lines: +1 -1
change priority for printing messages in ring buffer for kernel
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revision 1.2
date: 2014/11/25 06:23:16; author: root; state: Exp; lines: +1 -0
give message to the kernel for unregistering the module
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revision 1.1
date: 2014/11/25 06:17:14; author: root; state: Exp;
Initial revision
=============================================================================

]]> https://www.emblogic.com/blog/11/rcs-file-for-character-driver-upto-registering-and-unregistering-the-driver-into-and-from-the-kernel/feed/ 0 IPC based project using threads https://www.emblogic.com/blog/11/ipc-based-project-using-threads/ https://www.emblogic.com/blog/11/ipc-based-project-using-threads/#comments Fri, 21 Nov 2014 17:51:28 +0000 http://www.emblogic.com/blog/?p=11838 Continue reading →]]> RCS for sever file

RCS file: server.c,v
Working file: server.c
head: 1.34
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keyword substitution: kv
total revisions: 34; selected revisions: 34
description:
server program using threads
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revision 1.34
date: 2014/11/21 06:58:33; author: root; state: Exp; lines: +1 -1
*** empty log message ***
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revision 1.33
date: 2014/11/21 06:57:13; author: root; state: Exp; lines: +8 -4
*** empty log message ***
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revision 1.32
date: 2014/11/21 06:39:39; author: root; state: Exp; lines: +1 -1
*** empty log message ***
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revision 1.31
date: 2014/11/21 06:37:42; author: root; state: Exp; lines: +1 -1
give client id as a type for message queue
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revision 1.30
date: 2014/11/21 06:13:45; author: root; state: Exp; lines: +21 -37
make 100 threads
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revision 1.29
date: 2014/11/20 09:46:12; author: root; state: Exp; lines: +12 -5
*** empty log message ***
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revision 1.28
date: 2014/11/20 09:16:19; author: root; state: Exp; lines: +2 -2
*** empty log message ***
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revision 1.27
date: 2014/11/20 09:15:35; author: root; state: Exp; lines: +3 -3
*** empty log message ***
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revision 1.26
date: 2014/11/20 09:10:45; author: root; state: Exp; lines: +3 -3
*** empty log message ***
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revision 1.25
date: 2014/11/20 09:09:43; author: root; state: Exp; lines: +6 -6
*** empty log message ***
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revision 1.24
date: 2014/11/20 09:07:43; author: root; state: Exp; lines: +6 -3
*** empty log message ***
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revision 1.23
date: 2014/11/20 08:59:07; author: root; state: Exp; lines: +5 -5
*** empty log message ***
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revision 1.22
date: 2014/11/20 08:57:50; author: root; state: Exp; lines: +1 -2
*** empty log message ***
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revision 1.21
date: 2014/11/20 08:56:35; author: root; state: Exp; lines: +1 -1
*** empty log message ***
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revision 1.20
date: 2014/11/20 08:56:00; author: root; state: Exp; lines: +2 -2
*** empty log message ***
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revision 1.19
date: 2014/11/20 08:54:45; author: root; state: Exp; lines: +1 -1
*** empty log message ***
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revision 1.18
date: 2014/11/20 08:53:47; author: root; state: Exp; lines: +1 -1
*** empty log message ***
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revision 1.17
date: 2014/11/20 08:52:18; author: root; state: Exp; lines: +5 -4
*** empty log message ***
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revision 1.16
date: 2014/11/20 08:49:17; author: root; state: Exp; lines: +3 -3
*** empty log message ***
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revision 1.15
date: 2014/11/20 08:45:13; author: root; state: Exp; lines: +3 -3
*** empty log message ***
—————————-
revision 1.14
date: 2014/11/20 08:37:58; author: root; state: Exp; lines: +1 -1
*** empty log message ***
—————————-
revision 1.13
date: 2014/11/20 08:37:39; author: root; state: Exp; lines: +1 -1
*** empty log message ***
—————————-
revision 1.12
date: 2014/11/20 08:36:57; author: root; state: Exp; lines: +1 -1
*** empty log message ***
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revision 1.11
date: 2014/11/20 08:30:25; author: root; state: Exp; lines: +15 -17
compute result and write it to themessage queue
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revision 1.10
date: 2014/11/20 07:59:41; author: root; state: Exp; lines: +3 -3
*** empty log message ***
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revision 1.9
date: 2014/11/20 07:57:11; author: root; state: Exp; lines: +4 -0
*** empty log message ***
—————————-
revision 1.8
date: 2014/11/20 07:52:29; author: root; state: Exp; lines: +3 -3
*** empty log message ***
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revision 1.7
date: 2014/11/20 07:50:32; author: root; state: Exp; lines: +3 -3
*** empty log message ***
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revision 1.6
date: 2014/11/20 07:47:57; author: root; state: Exp; lines: +54 -6
depending upon the information received new thread is created using pthread_create function call
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revision 1.5
date: 2014/11/20 06:52:56; author: root; state: Exp; lines: +9 -1
receive message from message queue using msgrcv function call
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revision 1.4
date: 2014/11/20 06:42:53; author: root; state: Exp; lines: +1 -1
*** empty log message ***
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revision 1.3
date: 2014/11/20 06:39:55; author: root; state: Exp; lines: +19 -1
create meassage queue using msgget function
control message queue operation using msgctl
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revision 1.2
date: 2014/11/19 19:36:38; author: root; state: Exp; lines: +1 -1
included file header.h
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revision 1.1
date: 2014/11/19 18:06:28; author: root; state: Exp;
Initial revision
=============================================================================

RCS for client file
RCS file: ./client1.c,v
Working file: ./client1.c
head: 1.11
branch:
locks: strict
access list:
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keyword substitution: kv
total revisions: 11; selected revisions: 11
description:
this is a file for client 1 which communicates with the server
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revision 1.11
date: 2014/11/21 06:38:26; author: root; state: Exp; lines: +2 -1
get process id and send to the server
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revision 1.10
date: 2014/11/20 09:32:50; author: root; state: Exp; lines: +1 -1
*** empty log message ***
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revision 1.9
date: 2014/11/20 08:35:23; author: root; state: Exp; lines: +3 -1
recieve reesult from the message queue
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revision 1.8
date: 2014/11/20 06:41:03; author: root; state: Exp; lines: +15 -1
define a variable of the form struct msgbuf
assign value to the variable
send data to through message queue
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revision 1.7
date: 2014/11/19 20:15:01; author: root; state: Exp; lines: +1 -1
*** empty log message ***
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revision 1.6
date: 2014/11/19 20:14:35; author: root; state: Exp; lines: +1 -1
*** empty log message ***
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revision 1.5
date: 2014/11/19 20:13:50; author: root; state: Exp; lines: +8 -3
use msgctl to control message queue operations
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revision 1.4
date: 2014/11/19 19:57:16; author: root; state: Exp; lines: +2 -2
*** empty log message ***
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revision 1.3
date: 2014/11/19 19:54:52; author: root; state: Exp; lines: +11 -0
use msgget function to create message queue
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revision 1.2
date: 2014/11/19 19:37:48; author: root; state: Exp; lines: +1 -1
included file header.h
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revision 1.1
date: 2014/11/19 18:10:35; author: root; state: Exp;
Initial revision
=============================================================================
RCS for header file

RCS file: ./header.h,v
Working file: ./header.h
head: 1.8
branch:
locks: strict
access list:
symbolic names:
keyword substitution: kv
total revisions: 8; selected revisions: 8
description:
header file for client-serverr program using threads
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revision 1.8
date: 2014/11/21 06:38:06; author: root; state: Exp; lines: +2 -0
define a new element p_id in structure msgbuf
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revision 1.7
date: 2014/11/21 06:14:25; author: root; state: Exp; lines: +1 -3
give prototype for perform_op
remove prototype for perform_add, perform_sub, perform_mul functions
—————————-
revision 1.6
date: 2014/11/20 08:36:18; author: root; state: Exp; lines: +1 -1
*** empty log message ***
—————————-
revision 1.5
date: 2014/11/20 08:34:49; author: root; state: Exp; lines: +6 -0
define a structure named result to store the computed result
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revision 1.4
date: 2014/11/20 07:48:49; author: root; state: Exp; lines: +4 -1
included header file pthread.h
give prototype for threads perofrm_add, perform_sub, perform_mul
—————————-
revision 1.3
date: 2014/11/19 20:17:58; author: root; state: Exp; lines: +15 -0
define a structure msg_format to define format of information send by client
—————————-
revision 1.2
date: 2014/11/19 19:36:52; author: root; state: Exp; lines: +3 -1
included header files sys/types.h , sys/ipc.h , sys/msg.h to use message queue as a IPC mechanism
—————————-
revision 1.1
date: 2014/11/19 18:10:51; author: root; state: Exp;
Initial revision
=============================================================================

]]> https://www.emblogic.com/blog/11/ipc-based-project-using-threads/feed/ 0 IPC based server-client project using message queue https://www.emblogic.com/blog/11/11771/ https://www.emblogic.com/blog/11/11771/#comments Wed, 12 Nov 2014 15:54:42 +0000 http://www.emblogic.com/blog/?p=11771 Continue reading →]]> Header file RCS for IPC project using message queue:

RCS file: ./header.h,v
Working file: ./header.h
head: 1.4
branch:
locks: strict
root: 1.4
access list:
symbolic names:
keyword substitution: kv
total revisions: 4; selected revisions: 4
description:
header file for client server program using message queue
—————————-
revision 1.4 locked by: root;
date: 2014/11/12 12:09:26; author: root; state: Exp; lines: +6 -0
define a struct named result to store the calculated result and send back this result to tha client with a type 2
—————————-
revision 1.3
date: 2014/11/12 11:54:09; author: root; state: Exp; lines: +8 -1
define structure struct message
this structure has a format of message to be sent in message queue
—————————-
revision 1.2
date: 2014/11/12 10:04:38; author: root; state: Exp; lines: +5 -0
define structure msgbuf to specify the message format
—————————-
revision 1.1
date: 2014/11/12 09:38:23; author: root; state: Exp;
Initial revision
=============================================================================

Server file RCS for IPC project using message queue:

RCS file: ./server.c,v
Working file: ./server.c
head: 1.9
branch:
locks: strict
root: 1.9
access list:
symbolic names:
keyword substitution: kv
total revisions: 9; selected revisions: 9
description:
server for client server project using message queue
—————————-
revision 1.9 locked by: root;
date: 2014/11/12 12:17:41; author: root; state: Exp; lines: +24 -21
insert process of receiving message from client, procesing it and sending output back to the client in a while loop so that
more than one client can request.
—————————-
revision 1.8
date: 2014/11/12 12:12:18; author: root; state: Exp; lines: +1 -1
*** empty log message ***
—————————-
revision 1.7
date: 2014/11/12 12:10:15; author: root; state: Exp; lines: +22 -1
define variable re of type struct result tto store calculated result
send this calculated result back to the client with a type 2
—————————-
revision 1.6
date: 2014/11/12 11:55:11; author: root; state: Exp; lines: +4 -2
change the message format from character to struct message i.e., 2 int values and one char
—————————-
revision 1.5
date: 2014/11/12 10:11:36; author: root; state: Exp; lines: +2 -1
*** empty log message ***
—————————-
revision 1.4
date: 2014/11/12 10:05:18; author: root; state: Exp; lines: +10 -0
receive messege from message queue using msgrcv()
—————————-
revision 1.3
date: 2014/11/12 09:52:05; author: root; state: Exp; lines: +9 -1
perform control operation on message queue
—————————-
revision 1.2
date: 2014/11/12 09:43:40; author: root; state: Exp; lines: +15 -0
create messeage queue
—————————-
revision 1.1
date: 2014/11/12 09:38:23; author: root; state: Exp;
Initial revision
=============================================================================

Header file RCS for IPC project using message queue:
RCS file: ./client1.c,v
Working file: ./client1.c
head: 1.7
branch:
locks: strict
root: 1.7
access list:
symbolic names:
keyword substitution: kv
total revisions: 7; selected revisions: 7
description:
client file for client serverr project using messege queue
—————————-
revision 1.7 locked by: root;
date: 2014/11/12 12:11:02; author: root; state: Exp; lines: +4 -0
define variable res to store the received result from the server
the variable res has a type struct result
—————————-
revision 1.6
date: 2014/11/12 11:55:58; author: root; state: Exp; lines: +11 -4
change the message format from character to struct message i.e., 2 int values and 1 char
—————————-
revision 1.5
date: 2014/11/12 10:11:37; author: root; state: Exp; lines: +2 -1
*** empty log message ***
—————————-
revision 1.4
date: 2014/11/12 10:09:35; author: root; state: Exp; lines: +13 -1
send message to message queue using msgsnd()
—————————-
revision 1.3
date: 2014/11/12 09:52:29; author: root; state: Exp; lines: +9 -1
perform control operation on message queue
—————————-
revision 1.2
date: 2014/11/12 09:43:53; author: root; state: Exp; lines: +12 -0
create message queue
—————————-
revision 1.1
date: 2014/11/12 09:38:23; author: root; state: Exp;
Initial revision
=============================================================================

]]> https://www.emblogic.com/blog/11/11771/feed/ 0 client-server communication using PIPES https://www.emblogic.com/blog/11/client-server-communication-using-pipes/ https://www.emblogic.com/blog/11/client-server-communication-using-pipes/#comments Fri, 07 Nov 2014 09:49:40 +0000 http://www.emblogic.com/blog/?p=11726 Continue reading →]]> server.c:

#include"header1.h"

int main()
{
    pid_t pid_c,pid_p;
    int fd_c[2],fd_p[2],counter=0,pipec_success,pipep_success,stat_val,res;
    char fd_cr[2],fd_cw[2],fd_pr[2],fd_pw[2],*path;
    struct data_format data;

    path = malloc(sizeof(char)*50);

    while(counter < 3)
    {
        pipec_success = pipe(fd_c);
        if(pipec_success != 0)
        {
            perror("Pipe client:");
            return -1;
        }

        sprintf(fd_cr,"%d",fd_c[0]);
        sprintf(fd_cw,"%d",fd_c[1]);

        printf("Enter path\n");
        gets(path);
        pid_c = fork();

        if(pid_c == 0)
        {
            execl(path,fd_cw,"input",NULL);
        }

        if(pid_c != 0)
            wait(&stat_val);

        read(fd_c[0],&data,sizeof(data));
        //printf("read data is %d %d %c",data.num1,data.num2,data.operation);
        pipep_success = pipe(fd_p);
        if(pipep_success != 0)
        {
            perror("Pipe process:");
            return -1;
        }

        write(fd_p[1],&data,sizeof(data));

        sprintf(fd_pr,"%d",fd_p[0]);
        sprintf(fd_pw,"%d",fd_p[1]);

        switch (data.operation)
        {
            case '+':
                pid_p = fork();

                if(pid_p == 0)
                {
                    execl("/home/ritu/emblogic/project_3/adder",fd_pr,fd_pw,NULL);
                }

                if(pid_p != 0)
                wait(&stat_val);
                break;
            case '-':
                pid_p = fork();

                if(pid_p == 0)
                {
                    execl("/home/ritu/emblogic/project_3/subtractor",fd_pr,fd_pw,NULL);
                }

                if(pid_p != 0)
                    wait(&stat_val);
                break;
            case '*':
                 pid_p = fork();

                if(pid_p == 0)
                {
                    execl("/home/ritu/emblogic/project_3/multiplier",fd_pr,fd_pw,NULL);
                }

                if(pid_p != 0)
                    wait(&stat_val);
                break;
        }

        read(fd_p[0],&res,sizeof(res));
        write(fd_c[1],&res,sizeof(res));
        pid_c = fork();
        if(pid_c == 0)
        {
            execl(path,fd_cr,fd_cw,"output",NULL);
        }

        if(pid_c != 0)
            wait(&stat_val);

        counter++;
    }
    return 0;
}
]]> https://www.emblogic.com/blog/11/client-server-communication-using-pipes/feed/ 0 Program to pass file descriptor from one process to another https://www.emblogic.com/blog/10/program-to-pass-file-descriptor-from-one-process-to-another/ https://www.emblogic.com/blog/10/program-to-pass-file-descriptor-from-one-process-to-another/#comments Thu, 30 Oct 2014 15:36:10 +0000 http://www.emblogic.com/blog/?p=11624 Continue reading →]]> Output of the program is:
Main function starts
File opened successfully with fd 3
i am in parent
I am in child process and my pid is 1505
fd received from calling process is 3
file contains
Welcome to emblogic.

child terminated.

]]> https://www.emblogic.com/blog/10/program-to-pass-file-descriptor-from-one-process-to-another/feed/ 0 4-bit compression completed https://www.emblogic.com/blog/10/4-bit-compression-completed/ https://www.emblogic.com/blog/10/4-bit-compression-completed/#comments Sat, 18 Oct 2014 04:22:41 +0000 http://www.emblogic.com/blog/?p=11607 Continue reading →]]> RCS file: mdc.c,v
Working file: mdc.c
head: 1.45
branch:
locks: strict
root: 1.45
access list:
symbolic names:
keyword substitution: kv
total revisions: 45; selected revisions: 45
description:
create a base code for multiple data compression and encryption using iterative technique
—————————-
revision 1.45 locked by: root;
date: 2014/10/17 07:10:11; author: root; state: Exp; lines: +21 -7
define compression function for 4 bit code length
—————————-
revision 1.44
date: 2014/10/17 06:02:25; author: root; state: Exp; lines: +2 -2
*** empty log message ***
—————————-
revision 1.43
date: 2014/10/16 20:45:40; author: root; state: Exp; lines: +3 -3
write a compression code for code length 4 to check if data compressed successfully
if it creates a compressed file of the size half of the original file
—————————-
revision 1.42
date: 2014/10/16 20:32:45; author: root; state: Exp; lines: +24 -3
write a compression function for 4 bit code length
—————————-
revision 1.41
date: 2014/10/16 20:18:51; author: root; state: Exp; lines: +9 -11
there was some error in the code
remove that error
index form the master array read successfully
—————————-
revision 1.40
date: 2014/10/16 20:05:47; author: root; state: Exp; lines: +4 -2
*** empty log message ***
—————————-
revision 1.39
date: 2014/10/16 20:01:54; author: root; state: Exp; lines: +10 -4
write break condition in compress4() function for EOL character
—————————-
revision 1.38
date: 2014/10/16 19:42:37; author: root; state: Exp; lines: +3 -3
*** empty log message ***
—————————-
revision 1.37
date: 2014/10/16 19:33:52; author: root; state: Exp; lines: +1 -1
*** empty log message ***
—————————-
revision 1.36
date: 2014/10/16 19:28:07; author: root; state: Exp; lines: +45 -26
gave a small defination for function compress4()
gave a defination for function search_index to search for the character in file for its index in master array
call search_index() from compress4() and print the value of index to check if it working properly
—————————-
revision 1.35
date: 2014/10/16 13:20:26; author: root; state: Exp; lines: +3 -3
*** empty log message ***
—————————-
revision 1.34
date: 2014/10/16 13:15:03; author: root; state: Exp; lines: +36 -1
define compress_data() function
write code to check if enetered in compress_data function
—————————-
revision 1.33
date: 2014/10/16 10:30:45; author: root; state: Exp; lines: +39 -1
define a function find_code_length()
this function is used to find the code length used to compress the data
—————————-
revision 1.32
date: 2014/10/15 07:35:41; author: root; state: Exp; lines: +0 -4
remove prototypes from functions from c
remove prototypes of functions from c file
—————————-
revision 1.31
date: 2014/10/15 07:06:45; author: root; state: Exp; lines: +22 -21
*** empty log message ***
—————————-
revision 1.30
date: 2014/10/15 07:01:34; author: root; state: Exp; lines: +2 -2
*** empty log message ***
—————————-
revision 1.29
date: 2014/10/15 06:59:02; author: root; state: Exp; lines: +1 -1
remove error in create_master_array_function
declare integer i as a static variable
—————————-
revision 1.28
date: 2014/10/15 06:56:20; author: root; state: Exp; lines: +1 -1
*** empty log message ***
—————————-
revision 1.27
date: 2014/10/15 06:55:25; author: root; state: Exp; lines: +4 -4
*** empty log message ***
—————————-
revision 1.26
date: 2014/10/15 06:48:48; author: root; state: Exp; lines: +23 -13
gave prototype for create_master_array
define function create_master_array
make a call to create_master_array from function read_file
—————————-
revision 1.25
date: 2014/10/15 06:33:54; author: root; state: Exp; lines: +3 -3
use command line arguments to send file name
—————————-
revision 1.24
date: 2014/10/15 06:13:52; author: root; state: Exp; lines: +1 -1
*** empty log message ***
—————————-
revision 1.23
date: 2014/10/15 05:57:47; author: root; state: Exp; lines: +1 -1
*** empty log message ***
—————————-
revision 1.22
date: 2014/10/14 19:58:45; author: root; state: Exp; lines: +1 -1
*** empty log message ***
—————————-
revision 1.21
date: 2014/10/14 19:56:53; author: root; state: Exp; lines: +10 -4
use command line arguments to give the file name instead of hard coded it
—————————-
revision 1.20
date: 2014/10/14 19:21:24; author: root; state: Exp; lines: +2 -2
*** empty log message ***
—————————-
revision 1.19
date: 2014/10/14 19:14:36; author: root; state: Exp; lines: +61 -42
provide proper indentation to the code
use perror call to report the error
—————————-
revision 1.18
date: 2014/10/14 19:01:02; author: root; state: Exp; lines: +1 -1
*** empty log message ***
—————————-
revision 1.17
date: 2014/10/14 18:59:01; author: root; state: Exp; lines: +1 -1
did some changes in function check_unique to get the desired result
—————————-
revision 1.16
date: 2014/10/14 18:47:58; author: root; state: Exp; lines: +1 -1
prevent LF(\n) to save in master array
—————————-
revision 1.15
date: 2014/10/14 18:44:44; author: root; state: Exp; lines: +1 -1
remove error
—————————-
revision 1.14
date: 2014/10/14 18:43:49; author: root; state: Exp; lines: +7 -4
print total number of characters in master array
—————————-
revision 1.13
date: 2014/10/14 18:36:01; author: root; state: Exp; lines: +2 -0
allocate memory to master_array using malloc
—————————-
revision 1.12
date: 2014/10/14 18:34:14; author: root; state: Exp; lines: +2 -2
remove error
—————————-
revision 1.11
date: 2014/10/14 18:28:48; author: root; state: Exp; lines: +29 -1
gave prototype for check_unique function
check_unique function check the master array
if read character found in the array it returns 0 to the calling function
if not found returns 1
a call to the function check_unique is made in read_file function
—————————-
revision 1.10
date: 2014/10/14 17:55:17; author: root; state: Exp; lines: +1 -1
*** empty log message ***
—————————-
revision 1.9
date: 2014/10/14 17:50:04; author: root; state: Exp; lines: +1 -0
made a call to read_file function
—————————-
revision 1.8
date: 2014/10/14 17:46:35; author: root; state: Exp; lines: +16 -1
gave a prototype for read_file function
define function read
read_file
—————————-
revision 1.7
date: 2014/10/14 17:41:33; author: root; state: Exp; lines: +1 -1
*** empty log message ***
—————————-
revision 1.6
date: 2014/10/14 17:39:50; author: root; state: Exp; lines: +7 -3
make a call to open_file function for opening a file
—————————-
revision 1.5
date: 2014/10/14 17:35:54; author: root; state: Exp; lines: +3 -1
did some changes in open_file function
—————————-
revision 1.4
date: 2014/10/14 17:33:51; author: root; state: Exp; lines: +1 -1
remove error in open_file function
—————————-
revision 1.3
date: 2014/10/14 17:26:48; author: root; state: Exp; lines: +8 -0
gave the prototype for open_file function.
open_file fuction is used to open a file and return a file descriptor to the calling function
—————————-
revision 1.2
date: 2014/10/14 17:14:16; author: root; state: Exp; lines: +1 -1
use double quotes instead of triangular braces to include header.h
—————————-
revision 1.1
date: 2014/10/14 17:04:00; author: root; state: Exp;
Initial revision
=============================================================================

]]> https://www.emblogic.com/blog/10/4-bit-compression-completed/feed/ 0 Header file for MDC project https://www.emblogic.com/blog/10/header-file-for-mdc-project/ https://www.emblogic.com/blog/10/header-file-for-mdc-project/#comments Thu, 16 Oct 2014 13:04:32 +0000 http://www.emblogic.com/blog/?p=11604 Continue reading →]]> RCS file: header.h,v
Working file: header.h
head: 1.5
branch:
locks: strict
root: 1.5
access list:
symbolic names:
keyword substitution: kv
total revisions: 5; selected revisions: 5
description:
create header file for multiple data compression and encryption using iterative technique
—————————-
revision 1.5 locked by: root;
date: 2014/10/16 10:32:01; author: root; state: Exp; lines: +1 -0
gave prototype for find_code_length
—————————-
revision 1.4
date: 2014/10/15 07:37:13; author: root; state: Exp; lines: +6 -0
add prototypes of function from c file to header file
—————————-
revision 1.3
date: 2014/10/14 18:34:24; author: root; state: Exp; lines: +1 -0
include header file stdlib.h
—————————-
revision 1.2
date: 2014/10/14 17:30:29; author: root; state: Exp; lines: +1 -1
included header file fcntl.h as this header file is to be used if we are using low level file I/O in our program
—————————-
revision 1.1
date: 2014/10/14 17:06:49; author: root; state: Exp;
Initial revision
=============================================================================

]]> https://www.emblogic.com/blog/10/header-file-for-mdc-project/feed/ 0 Master array for data compression is created https://www.emblogic.com/blog/10/multiple-data-compression-and-encryption-using-iterative-technique-2/ https://www.emblogic.com/blog/10/multiple-data-compression-and-encryption-using-iterative-technique-2/#comments Thu, 16 Oct 2014 09:38:13 +0000 http://www.emblogic.com/blog/?p=11593 Continue reading →]]> RCS file: mdc.c,v
Working file: mdc.c
head: 1.32
branch:
locks: strict
access list:
symbolic names:
keyword substitution: kv
total revisions: 32; selected revisions: 32
description:
create a base code for multiple data compression and encryption using iterative technique
—————————-
revision 1.32
date: 2014/10/15 07:35:41; author: root; state: Exp; lines: +0 -4
remove prototypes from functions from c
remove prototypes of functions from c file
—————————-
revision 1.31
date: 2014/10/15 07:06:45; author: root; state: Exp; lines: +22 -21
*** empty log message ***
—————————-
revision 1.30
date: 2014/10/15 07:01:34; author: root; state: Exp; lines: +2 -2
*** empty log message ***
—————————-
revision 1.29
date: 2014/10/15 06:59:02; author: root; state: Exp; lines: +1 -1
remove error in create_master_array_function
declare integer i as a static variable
—————————-
revision 1.28
date: 2014/10/15 06:56:20; author: root; state: Exp; lines: +1 -1
*** empty log message ***
—————————-
revision 1.27
date: 2014/10/15 06:55:25; author: root; state: Exp; lines: +4 -4
*** empty log message ***
—————————-
revision 1.26
date: 2014/10/15 06:48:48; author: root; state: Exp; lines: +23 -13
gave prototype for create_master_array
define function create_master_array
make a call to create_master_array from function read_file
—————————-
revision 1.25
date: 2014/10/15 06:33:54; author: root; state: Exp; lines: +3 -3
use command line arguments to send file name
—————————-
revision 1.24
date: 2014/10/15 06:13:52; author: root; state: Exp; lines: +1 -1
*** empty log message ***
—————————-
revision 1.23
date: 2014/10/15 05:57:47; author: root; state: Exp; lines: +1 -1
*** empty log message ***
—————————-
revision 1.22
date: 2014/10/14 19:58:45; author: root; state: Exp; lines: +1 -1
*** empty log message ***
—————————-
revision 1.21
date: 2014/10/14 19:56:53; author: root; state: Exp; lines: +10 -4
use command line arguments to give the file name instead of hard coded it
—————————-
revision 1.20
date: 2014/10/14 19:21:24; author: root; state: Exp; lines: +2 -2
*** empty log message ***
—————————-
revision 1.19
date: 2014/10/14 19:14:36; author: root; state: Exp; lines: +61 -42
provide proper indentation to the code
use perror call to report the error
—————————-
revision 1.18
date: 2014/10/14 19:01:02; author: root; state: Exp; lines: +1 -1
*** empty log message ***
—————————-
revision 1.17
date: 2014/10/14 18:59:01; author: root; state: Exp; lines: +1 -1
did some changes in function check_unique to get the desired result
—————————-
revision 1.16
date: 2014/10/14 18:47:58; author: root; state: Exp; lines: +1 -1
prevent LF(\n) to save in master array
—————————-
revision 1.15
date: 2014/10/14 18:44:44; author: root; state: Exp; lines: +1 -1
remove error
—————————-
revision 1.14
date: 2014/10/14 18:43:49; author: root; state: Exp; lines: +7 -4
print total number of characters in master array
—————————-
revision 1.13
date: 2014/10/14 18:36:01; author: root; state: Exp; lines: +2 -0
allocate memory to master_array using malloc
—————————-
revision 1.12
date: 2014/10/14 18:34:14; author: root; state: Exp; lines: +2 -2
remove error
—————————-
revision 1.11
date: 2014/10/14 18:28:48; author: root; state: Exp; lines: +29 -1
gave prototype for check_unique function
check_unique function check the master array
if read character found in the array it returns 0 to the calling function
if not found returns 1
a call to the function check_unique is made in read_file function
—————————-
revision 1.10
date: 2014/10/14 17:55:17; author: root; state: Exp; lines: +1 -1
*** empty log message ***
—————————-
revision 1.9
date: 2014/10/14 17:50:04; author: root; state: Exp; lines: +1 -0
made a call to read_file function
—————————-
revision 1.8
date: 2014/10/14 17:46:35; author: root; state: Exp; lines: +16 -1
gave a prototype for read_file function
define function read
read_file
—————————-
revision 1.7
date: 2014/10/14 17:41:33; author: root; state: Exp; lines: +1 -1
*** empty log message ***
—————————-
revision 1.6
date: 2014/10/14 17:39:50; author: root; state: Exp; lines: +7 -3
make a call to open_file function for opening a file
—————————-
revision 1.5
date: 2014/10/14 17:35:54; author: root; state: Exp; lines: +3 -1
did some changes in open_file function
—————————-
revision 1.4
date: 2014/10/14 17:33:51; author: root; state: Exp; lines: +1 -1
remove error in open_file function
—————————-
revision 1.3
date: 2014/10/14 17:26:48; author: root; state: Exp; lines: +8 -0
gave the prototype for open_file function.
open_file fuction is used to open a file and return a file descriptor to the calling function
—————————-
revision 1.2
date: 2014/10/14 17:14:16; author: root; state: Exp; lines: +1 -1
use double quotes instead of triangular braces to include header.h
—————————-
revision 1.1
date: 2014/10/14 17:04:00; author: root; state: Exp;
Initial revision
=============================================================================

]]> https://www.emblogic.com/blog/10/multiple-data-compression-and-encryption-using-iterative-technique-2/feed/ 0