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| author | priyanka | 2015-06-24 15:03:17 +0530 |
|---|---|---|
| committer | priyanka | 2015-06-24 15:03:17 +0530 |
| commit | b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b (patch) | |
| tree | ab291cffc65280e58ac82470ba63fbcca7805165 /1088/CH23/EX23.1/Result1.txt | |
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initial commit / add all books
Diffstat (limited to '1088/CH23/EX23.1/Result1.txt')
| -rwxr-xr-x | 1088/CH23/EX23.1/Result1.txt | 88 |
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diff --git a/1088/CH23/EX23.1/Result1.txt b/1088/CH23/EX23.1/Result1.txt new file mode 100755 index 000000000..13866ef0c --- /dev/null +++ b/1088/CH23/EX23.1/Result1.txt @@ -0,0 +1,88 @@ + ans =
+
+ 1.
+
+-->exec('Example1.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 : 23
+
+ Chapter Title : Systems programming I- Files
++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+Example 1 : Show the method of copying files with the read and write system calls
+
+ ****************************************************************
+
+ Answer :
+
+ INSTRUCTIONS :
+
+ 1.These programs are part of systems programming in Unix and the commands have NO EQUIVALENT IN SCILAB
+
+ 2.However if possible some selected programmes have been TRIED TO BE IMPLEMENTED
+
+ 3.For most of the programmes whose equivalent is NOT THERE IN SCILAB,only the output has been printed as given in the textbook w
+ ith no interactive input as in the programme below
+
+ 4.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
+
+ 5.The inconvenience is regretted.
+.............Press [ENTER] to continue..... UNIX SHELL SIMULATOR(DEMO VERSION WITH PRELOADED COMMANDS)
+
+
+
+
+$ cat ccp.c # to open the file emp.lst /* Program ccp.c -- Copies a file with the read and write system calls */
+
+#include <fcntl.h> /* For O_RDONLY , O_WRONLY , O_CREAT etc. */
+#include <sys/stat.h> /* for S_IRUSR , S_IWUSR , S_IRGRP etc. */
+#define BUFSIZE 1024 /* May not be the rigth size here */
+
+int main(void) {
+ int fd1, fd2; /* File descriptors for read and write */
+ int n; /* Number of characters returned by read */
+ char buf[BUFSIZE]; /* BUFSIZE should be carefully chosen */
+ fd1 = open("/etc/passwd",O_RDONLY);
+ fd2 = open("passwd.bak",O_WRONLY | O_CREAT | O_TRUNC ,
+ S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH); /* Mode 664*/
+
+ while ((n = read(fd1, buf, BUFSIZE)) > 0) /* Return value of read is */
+ write(fd2, buf, n); /* used by write as argument */
+
+ close(fd1);
+ close(fd2);
+ exit(0); /* This would have closed all file descriptors */
+}
+ $ cc ccp.c $ a.out $ cmp /etc/passwd passwd.bak $ _ # Prompt returns-files identical
+
+
+$ 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)
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