diff options
Diffstat (limited to '1088/CH24/EX24.13')
| -rwxr-xr-x | 1088/CH24/EX24.13/Example13.sce | 77 | ||||
| -rwxr-xr-x | 1088/CH24/EX24.13/Result13.txt | 93 |
2 files changed, 170 insertions, 0 deletions
diff --git a/1088/CH24/EX24.13/Example13.sce b/1088/CH24/EX24.13/Example13.sce new file mode 100755 index 000000000..c38922d79 --- /dev/null +++ b/1088/CH24/EX24.13/Example13.sce @@ -0,0 +1,77 @@ +clear +flag=1 +mode(-1) +clc + +printf("Example 13 : Show the method of running two programs in a pileline \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 pipe2.c -- Runs two programs in a pipeline Child runs cat, parent runs tr */' +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 *message,int exit_status);' +i=i+1;f(i)='int main(void) { ' +i=i+1;f(i)=' int fd[2]; /* To be fille dup by pipe() */' +i=i+1;f(i)=' ' +i=i+1;f(i)=' if (pipe(fd) < 0) /* Now have four descriptors for pipe */' +i=i+1;f(i)=' quit('+ascii(34)+'pipe'+ascii(34)+', 1);' +i=i+1;f(i)=' switch (fork()) {' +i=i+1;f(i)=' case -1: quit('+ascii(34)+'fork'+ascii(34)+', 2);' +i=i+1;f(i)=' ' +i=i+1;f(i)=' case 0: close(fd[0]); /* CHILD - Close read end first */' +i=i+1;f(i)=' dup2(fd[1], STDOUT_FILENO); /* Connect stdout to write end */' +i=i+1;f(i)=' close(fd[1]); /* and close original descriptor */' + i=i+1;f(i)=' execlp('+ascii(34)+'cat'+ascii(34)+', '+ascii(34)+'cat'+ascii(34)+','+ascii(34)+'/etc/hosts.equiv'+ascii(34)+', (char *) 0);' +i=i+1;f(i)=' ' +i=i+1;f(i)=' default: close(fd[1]); /* PARENT -- Close write end first */' +i=i+1;f(i)=' dup2(fd[0], STDIN_FILENO); /* Connect stdin to read end */' +i=i+1;f(i)=' close(fd[0]); /* and close original descriptor */' +i=i+1;f(i)=' execlp('+ascii(34)+'tr'+ascii(34)+', '+ascii(34)+'tr'+ascii(34)+', '+ascii(34)+''+ascii(39)+'[a-z]'+ascii(39)+''+ascii(34)+','+ascii(34)+''+ascii(39)+'[A-Z]'+ascii(39)+''+ascii(34)+',(char *) 0);' +i=i+1;f(i)=' quit('+ascii(34)+'tr'+ascii(34)+', 4);' +i=i+1;f(i)='}' +i=i+1;f(i)='}' +n=i + + +printf("\n\n$ cat pipe2.c # to open the file emp.lst") +halt(' ') +u=mopen('pipe2.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("SATURN\nEARTH\nMERCURY\nJUPITER\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/EX24.13/Result13.txt b/1088/CH24/EX24.13/Result13.txt new file mode 100755 index 000000000..7d3ae5751 --- /dev/null +++ b/1088/CH24/EX24.13/Result13.txt @@ -0,0 +1,93 @@ + ans =
+
+ 1.
+
+-->exec('Example13.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 13 : Show the method of running two programs in a pileline
+
+ ****************************************************************
+
+ 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 pipe2.c # to open the file emp.lst /* Program pipe2.c -- Runs two programs in a pipeline Child runs cat, parent runs tr */
+#include <stdio.h>
+#include <unistd.h>
+
+void quit(char *message,int exit_status);
+int main(void) {
+ int fd[2]; /* To be fille dup by pipe() */
+
+ if (pipe(fd) < 0) /* Now have four descriptors for pipe */
+ quit("pipe", 1);
+ switch (fork()) {
+ case -1: quit("fork", 2);
+
+ case 0: close(fd[0]); /* CHILD - Close read end first */
+ dup2(fd[1], STDOUT_FILENO); /* Connect stdout to write end */
+ close(fd[1]); /* and close original descriptor */
+ execlp("cat", "cat","/etc/hosts.equiv", (char *) 0);
+
+ default: close(fd[1]); /* PARENT -- Close write end first */
+ dup2(fd[0], STDIN_FILENO); /* Connect stdin to read end */
+ close(fd[0]); /* and close original descriptor */
+ execlp("tr", "tr", "'[a-z]'","'[A-Z]'",(char *) 0);
+ quit("tr", 4);
+}
+}
+ $ cc pipe2.c $ a.out SATURN
+EARTH
+MERCURY
+JUPITER
+
+
+
+$ 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)
|