initial commit / add all books

2 files changed, 178 insertions, 0 deletions

diff --git a/1088/CH24/EX24.4/Example4.sce b/1088/CH24/EX24.4/Example4.sce
new file mode 100755
index 000000000..1f362959f
--- /dev/null
+++ b/1088/CH24/EX24.4/Example4.sce
@@ -0,0 +1,82 @@
+clear
+flag=1
+mode(-1)
+
+printf("Example 4    :    Show the effect of obtaining child termination status by WEXITSTATUS \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: wait.c -- Uses wait to obtain child'+ascii(39)+'s termination status.The WEXITSTATUS macro fetches the exit status */'
+i=i+1;f(i)='#include <stdio.h>'
+i=i+1;f(i)='#include <fcntl.h>'
+i=i+1;f(i)='#include <sys/wait.h>'
+i=i+1;f(i)=''
+i=i+1;f(i)='int main(int argc, char **argv) {'
+i=i+1;f(i)='    int fd,exitstatus;'
+i=i+1;f(i)='    int exitval = 10;   /* Value to be returned by child */'
+i=i+1;f(i)='    '
+i=i+1;f(i)='    fd= open(argv[1], O_WRONLY | O_CREAT | O_TRUNC, 0644);'
+i=i+1;f(i)='    write(fd, '+ascii(34)+'Original process writes\n'+ascii(34)+',24); /* First write */'
+    i=i+1;f(i)=''
+i=i+1;f(i)='    switch(fork()) {'
+i=i+1;f(i)='       case 0:'
+i=i+1;f(i)='            write(fd,'+ascii(34)+'Child writes\n'+ascii(34)+',13);       /* Second write */'
+i=i+1;f(i)='            close(fd);        /*Closing here doesn'+ascii(39)+'t affect parent'+ascii(39)+'s copy */'
+i=i+1;f(i)='            printf('+ascii(34)+'CHILD: Terminating with exit value %d\n'+ascii(34)+', exitval);'
+i=i+1;f(i)='            exit(exitval);   /* Can also use_exit(exitval) */'
+i=i+1;f(i)='            '
+i=i+1;f(i)='            default:'
+i=i+1;f(i)='                    wait(&exitstatus);  /* Waits for child to die */'
+i=i+1;f(i)='                    printf('+ascii(34)+'PARENT: Child terminated with exit value %d\n'+ascii(34)+',WEXITSTATUS(exitstatus));'
+i=i+1;f(i)='                                                           /*Extracting exit status */'
+i=i+1;f(i)='                    write(fd, '+ascii(34)+'Parent writes\n'+ascii(34)+', 14);      /* Third write */'
+i=i+1;f(i)='                    exit(20);           /* Value returned to shell; try echo $? */'
+i=i+1;f(i)='                    }'
+i=i+1;f(i)='}'
+n=i
+    
+
+printf("\n\n$ cat wait.c      # to open the file ")
+halt(' ')
+u=mopen('wait.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 wait.c")
+ halt(' ')
+ printf("$ a.out  foo")
+ halt(' ')
+ printf("CHILD: Terminating with exit value 10\nPARENT: Child terminated with exit value 10\n")
+ halt(' ')
+ printf("$ cat foo ")
+ halt(' ')
+ printf("Original process writes\nChild writes\nParent writes\n")
+ 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/EX24.4/Result4.txt b/1088/CH24/EX24.4/Result4.txt
new file mode 100755
index 000000000..1d3d913d7
--- /dev/null
+++ b/1088/CH24/EX24.4/Result4.txt
@@ -0,0 +1,96 @@
+ ans  =

+ 

+    1.  

+ 

+-->exec('Example4.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 4    :    Show the effect of obtaining child termination status by WEXITSTATUS 

+ 

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

+ 

+ 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 wait.c      # to open the file  /* Program: wait.c -- Uses wait to obtain child's termination status.The WEXITSTATUS macro fetches the exit status */

+#include <stdio.h>

+#include <fcntl.h>

+#include <sys/wait.h>

+

+int main(int argc, char **argv) {

+    int fd,exitstatus;

+    int exitval = 10;   /* Value to be returned by child */

+    

+    fd= open(argv[1], O_WRONLY | O_CREAT | O_TRUNC, 0644);

+    write(fd, "Original process writes\n",24); /* First write */

+

+    switch(fork()) {

+       case 0:

+            write(fd,"Child writes\n",13);       /* Second write */

+            close(fd);        /*Closing here doesn't affect parent's copy */

+            printf("CHILD: Terminating with exit value %d\n", exitval);

+            exit(exitval);   /* Can also use_exit(exitval) */

+            

+            default:

+                    wait(&exitstatus);  /* Waits for child to die */

+                    printf("PARENT: Child terminated with exit value %d\n",WEXITSTATUS(exitstatus));

+                                                           /*Extracting exit status */

+                    write(fd, "Parent writes\n", 14);      /* Third write */

+                    exit(20);           /* Value returned to shell; try echo $? */

+                    }

+}

+ $ cc wait.c $ a.out  foo CHILD: Terminating with exit value 10

+PARENT: Child terminated with exit value 10

+ $ cat foo  Original process writes

+Child writes

+Parent writes

+ 

+

+

+$ 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)