initial commit / add all books

2 files changed, 162 insertions, 0 deletions

diff --git a/1088/CH24/EX24.12/Example12.sce b/1088/CH24/EX24.12/Example12.sce
new file mode 100755
index 000000000..d07acaca4
--- /dev/null
+++ b/1088/CH24/EX24.12/Example12.sce
@@ -0,0 +1,75 @@
+clear
+flag=1
+mode(-1)
+clc
+
+printf("Example 12    :    Show the effect of sharing a pipe between two processes from parent to child \n")
+disp("****************************************************************")
+disp("Answer    :   ")
+disp("INSTRUCTIONS   : ")
+halt(' ')
+disp("1.These programs are part of systems programming PURELY in Unix and the commands have NO EQUIVALENT IN SCILAB")
+halt(' ')
+disp("2.However the .c files which are displayed here are also made into a seperate file.If you are a unix user then try compiling and running the programme with gcc or cc compiler")
+halt(' ')
+disp("3.The outputs displayed here are just MOCK OUTPUTS which are DISPLAYED IN THE TEXTBOOK")
+halt(' ')
+disp("4.The inconvenience is regretted.")
+halt('.............Press [ENTER] to continue.....')
+halt("")
+clc
+printf("\tUNIX SHELL SIMULATOR(DEMO VERSION WITH PRELOADED COMMANDS)\n\n\n")
+i=0
+i=i+1;f(i)='/* Program: pipe.c -- Shares a pipe between two processes for data to flow from parent to child*/'
+i=i+1;f(i)='#include <stdio.h>'
+i=i+1;f(i)='#include <unistd.h>'
+i=i+1;f(i)=''
+i=i+1;f(i)='void quit(char *, int);'
+i=i+1;f(i)='int main(void) {'
+i=i+1;f(i)='    int n,fd[2];       /* fd[2] to be filled up by pipe() */'
+i=i+1;f(i)='    char buf[100];     /* Buffer to be used by read() */'
+i=i+1;f(i)='    '
+i=i+1;f(i)='    if (pipe(fd) < 0)  /* fd[0] is read end */'
+i=i+1;f(i)='    quit('+ascii(34)+'pipe'+ascii(34)+',1);    /* fd[1] is write end */'
+ i=i+1;f(i)='   '
+i=i+1;f(i)='    switch (fork()) {    /* Pipe has four descriptors now */'
+i=i+1;f(i)='    case -1:quit('+ascii(34)+'Fork error'+ascii(34)+',2);'
+i=i+1;f(i)='     case 0:close(fd[1]); /* CHILD-Close write end of pipe */'
+i=i+1;f(i)='            n=read(fd[0],buf,100);  /* and read from its read end */'
+i=i+1;f(i)='            write(STDOUT_FILENO,buf,n);'
+i=i+1;f(i)='            break;'
+i=i+1;f(i)='     default: close(fd[0]);  /*PARENT-Close read end of pipe */'
+i=i+1;f(i)='            write(fd[1],'+ascii(34)+'Writing to pipe\n'+ascii(34)+', 16); /* write to write end */'
+i=i+1;f(i)='     }'
+i=i+1;f(i)='     exit(0);'
+i=i+1;f(i)='}'
+n=i
+ 
+
+printf("\n\n$ cat pipe.c      # to open the file emp.lst")
+halt(' ')
+u=mopen('pipe.c','wt')
+for i=1:n
+    mfprintf(u,"%s\n",f(i))
+    printf("%s\n",f(i))
+end
+mclose(u)
+halt('')
+clc
+
+halt(' ')
+ printf("$ cc shell.c")
+ halt(' ')
+ printf("$ a.out ")
+ halt(' ')
+ printf("Writing to pipe")
+ 
+halt(' ')
+printf("\n\n\n$ exit        #To exit the current simulation terminal and return to Scilab console\n\n")
+halt("........# (hit [ENTER] for result)")
+//clc()
+
+printf("\n\n\t\t\tBACK TO SCILAB CONSOLE...\nLoading initial environment')
+sleep(1000)
+
+
diff --git a/1088/CH24/EX24.12/Result12.txt b/1088/CH24/EX24.12/Result12.txt
new file mode 100755
index 000000000..ebbb592dc
--- /dev/null
+++ b/1088/CH24/EX24.12/Result12.txt
@@ -0,0 +1,87 @@
+ ans  =

+ 

+    2.  

+ 

+-->exec('Example12.sci')

+ 

+-->clear

+ 

+-->flag=1

+ flag  =

+ 

+    1.  

+ 

+-->mode(-1)

+Current date is 23-Jun-2013 

+ 

+Welcome to the Textbook Companionship Project 2013 

++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

+ 

+ Book Title                             :       UNIX CONCEPTS AND APPLICATIONS    

+ 

+ Book Edition                         :                                                                           4   

+ 

+ Book Author                          :                                                    Sumitabha Das   

++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

+ 

+ Code Author                          :                                                     Pranav Bhat T   

++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

+ 

+ Chapter Number                    :                                                                            24   

+ 

+ Chapter Title                         :                              Systems programming II- Files   

++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

+Example 12    :    Show the effect of sharing a pipe between two processes from parent to child 

+ 

+ ****************************************************************   

+ 

+ Answer    :      

+ 

+ INSTRUCTIONS   :    

+  

+ 1.These programs are part of systems programming PURELY in Unix and the commands have NO EQUIVALENT IN SCILAB   

+  

+ 2.However the .c files which are displayed here are also made into a seperate file.If you are a unix user then try compiling and 

+       running the programme with gcc or cc compiler                                                                              

+  

+ 3.The outputs displayed here are just MOCK OUTPUTS which are DISPLAYED IN THE TEXTBOOK   

+  

+ 4.The inconvenience is regretted.   

+.............Press [ENTER] to continue.....	UNIX SHELL SIMULATOR(DEMO VERSION WITH PRELOADED COMMANDS)

+

+

+

+

+$ cat pipe.c      # to open the file emp.lst /* Program: pipe.c -- Shares a pipe between two processes for data to flow from parent to child*/

+#include <stdio.h>

+#include <unistd.h>

+

+void quit(char *, int);

+int main(void) {

+    int n,fd[2];       /* fd[2] to be filled up by pipe() */

+    char buf[100];     /* Buffer to be used by read() */

+    

+    if (pipe(fd) < 0)  /* fd[0] is read end */

+    quit("pipe",1);    /* fd[1] is write end */

+   

+    switch (fork()) {    /* Pipe has four descriptors now */

+    case -1:quit("Fork error",2);

+     case 0:close(fd[1]); /* CHILD-Close write end of pipe */

+            n=read(fd[0],buf,100);  /* and read from its read end */

+            write(STDOUT_FILENO,buf,n);

+            break;

+     default: close(fd[0]);  /*PARENT-Close read end of pipe */

+            write(fd[1],"Writing to pipe\n", 16); /* write to write end */

+     }

+     exit(0);

+}

+ $ cc shell.c $ a.out  Writing to pipe 

+

+

+$ exit        #To exit the current simulation terminal and return to Scilab console

+

+........# (hit [ENTER] for result)

+

+			BACK TO SCILAB CONSOLE...

+Loading initial environment 

+-->diary(0)