1 files changed, 70 insertions, 0 deletions
diff --git a/1088/CH24/EX24.5/Example5.sce b/1088/CH24/EX24.5/Example5.sce
new file mode 100755
index 000000000..882b7c003
--- /dev/null
+++ b/1088/CH24/EX24.5/Example5.sce
@@ -0,0 +1,70 @@
+clear
+flag=1
+mode(-1)
+clc
+
+printf("Example 5    :    Show the effect of creating an orphan by letting child sleep for 2 minutes where parent dies immediately \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: orphan.c -- Creates an orphan by letting child sleep for 2 minutes.'
+i=i+1;f(i)='                        Parent doesn'+ascii(39)+'t call wait and dies immediately */'
+i=i+1;f(i)='#include <stdio.h>'
+i=i+1;f(i)='int main(void) {'
+i=i+1;f(i)='    int pid;'
+i=i+1;f(i)='    if ((pid = fork()) > 0)     /* Parent */'
+i=i+1;f(i)='    exit(10);                   /* Parent exits without calling wait */'
+i=i+1;f(i)='    else if (pid == 0) {        /* Child */'
+i=i+1;f(i)='    sleep(2);                   /* Lets parent die in this time frame */'
+i=i+1;f(i)='    printf('+ascii(34)+'CHILD: Adopted by init now, PPID: %d\n'+ascii(34)+',getppid());'
+i=i+1;f(i)='    exit(0);'
+i=i+1;f(i)='}'
+i=i+1;f(i)='}'
+n=i
+    
+
+printf("\n\n$ cat orphan.c      # to open the file emp.lst")
+halt(' ')
+u=mopen('orphan.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 orphan.c")
+ halt(' ')
+ printf("$ a.out                      ....no response for 2 seconds...")
+ halt(' ')
+ sleep(2000)
+ printf("CHILD: Adopted by init now, PPID: 1")
+ halt(' ')
+ printf("$ echo $?")
+ halt(' ')
+ printf("10")
+ halt(' ')
+
+printf("\n\n\n$ 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)
+
+