initial commit / add all books

1 files changed, 92 insertions, 0 deletions

diff --git a/1088/CH24/EX24.14/Example14.sce b/1088/CH24/EX24.14/Example14.sce
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index 000000000..4550a5a8c
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+++ b/1088/CH24/EX24.14/Example14.sce
@@ -0,0 +1,92 @@
+clear
+flag=1
+mode(-1)
+clc
+
+printf("Example 14    :  Show the use of generating signals and how the system can be made to catch it  \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: signal.c -- Waits for 5 seconds for user input and then generates SIGALRM that has a handler specified */'
+i=i+1;f(i)='#include <stdio.h>'
+i=i+1;f(i)='#include <unistd.h>'
+i=i+1;f(i)='#include <signal.h>'
+i=i+1;f(i)='#define BUFSIZE 100'
+i=i+1;f(i)=''
+i=i+1;f(i)='void alrm_handler(int signo);    /* Prototypes declarations for */'
+i=i+1;f(i)='void quit(char *message,int exit_status);  /*signal handler and quit */'
+i=i+1;f(i)=''
+i=i+1;f(i)='char buf[BUFSIZE] = '+ascii(34)+'foo\0'+ascii(34)+';         /* Global variable */'
+i=i+1;f(i)='int main(void) {'
+i=i+1;f(i)='    int n;'
+i=i+1;f(i)='    if (signal(SIGALRM, alrm_handler) == SIG_ERR)   /* signal returns SIG_ERR */'
+i=i+1;f(i)='    quit('+ascii(34)+'sigalrm'+ascii(34)+',1);                              /*on error*/'
+i=i+1;f(i)='    '
+i=i+1;f(i)='    fprintf(stderr, '+ascii(34)+'Enter filename: '+ascii(34)+');'
+i=i+1;f(i)='    alarm(5);                       /* Sets alarm clock;will deliver */'
+i=i+1;f(i)='    n = read(STDIN_FILENO, buf, BUFSIZE); /* SIGALRM in 5 seconds */'
+i=i+1;f(i)='    if (n>1)                               /* Will come here if user inputs */'
+i=i+1;f(i)='         printf('+ascii(34)+'Filename: %s\n'+ascii(34)+',buf);     /* string within 5 seconds */'
+i=i+1;f(i)='    exit(0);'
+i=i+1;f(i)='}'
+i=i+1;f(i)=''
+i=i+1;f(i)='void alrm_handler(int signo) {      /* Invoked with process recieves SIGALRM */'
+i=i+1;f(i)='        signal(SIGALRM, alrm_handler);  /* Resetting signal handler */'
+i=i+1;f(i)='        fprintf(stderr, '+ascii(34)+'\nSignal %d reeived, default filename: %s\n'+ascii(34)+', signo, buf);'
+i=i+1;f(i)='        exit(1);'
+i=i+1;f(i)='}'
+n=i
+    
+
+printf("\n\n$ cat signal.c      # to open the file emp.lst")
+halt(' ')
+u=mopen('signal.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 signal.c")
+ halt(' ')
+ printf("$ a.out ")
+ halt(' ')
+printf("Enter filename:  ")
+sleep(1000);printf("s");sleep(300);printf("i");sleep(300);printf("g") ;sleep(300);printf("n") ;sleep(300);printf("a") ;sleep(300);printf("l") ;sleep(300);printf(".") ;sleep(300);printf("l") ;sleep(300);printf("o") ;sleep(300);printf("g") ;sleep(500) ;printf(" [-ENTER-]")
+printf("\nFilename: signal.log")
+halt('')
+printf("$ a.out")
+halt(' ')
+printf("Enter filename:                             # Do not enter anything")
+sleep(5000)
+printf("# Nothing entered in 5 seconds \n")
+printf("Signal 14 received, default filename: foo")
+halt(' ')
+printf("$ kill -l | grep 14                      # What is signal 14")
+halt(' ')
+printf("13) SIGPIPE      14) SIGALRM       15) SIGTERM        16) SIGUSRI\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)
+
+