If a file has this mode number: 0402 what can the user who owns the file do with the file? write to it read read from it execute it nothing If a file has this mode number: 0305 what can the user who owns the file do with the file? write to it read from it execute it nothing If a file has this mode number: e011 what can the user who owns the file do with the file? write to it read from it execute it nothing

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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If a file has this mode number: 0402 what can the user who owns the file do with the file?
O write to it
I read read from it
execute it
O nothing
If a file has this mode number: 0305 what can the user who owns the file do with the file?
O write to it
I read from it
execute it
O nothing
If a file has this mode number: 0011 what can the user who owns the file do with the file?
| write to it
O read from it
I execute it
nothing
Transcribed Image Text:If a file has this mode number: 0402 what can the user who owns the file do with the file? O write to it I read read from it execute it O nothing If a file has this mode number: 0305 what can the user who owns the file do with the file? O write to it I read from it execute it O nothing If a file has this mode number: 0011 what can the user who owns the file do with the file? | write to it O read from it I execute it nothing
Consider the following program. It opens filel and file2 which have already been created with:
rm filel; rm file2; touch filel; touch file2;
echo "ghi" > filel
echo "gst" > file2
Therefore, each file contains 4 bytes.
Here is the program (it will not compile as is because it contains a question mark):
/* problem7.c */
#include cunistd.h>
int main(void)
{
char buffer = 'W';
open("filel", 2);
open("file2",2);
1seek (3, ?,1);
write(3,8buffer, 1);
1seek(4, -2,2);
write(4, 8buffer, 1);
read (e, &buffer, 1);
write(4,8buffer, 1);
1seek(3, -3,2);
write(3, &buffer, 1);
write(4, "\n", 1);
1seek(4,1,0);
write(4, &buffer, 1);
close(3);
close(4);
Without a further header file compilation will produce a warning, but this will not affect this problem.
When you enter a certain character and the single question mark is replaced with an appropriate number cat filel produces:
gxi
and cat file2 produces:
gxWx
What is that number and what is that character?
The single question mark (?) should be replaced with:
Transcribed Image Text:Consider the following program. It opens filel and file2 which have already been created with: rm filel; rm file2; touch filel; touch file2; echo "ghi" > filel echo "gst" > file2 Therefore, each file contains 4 bytes. Here is the program (it will not compile as is because it contains a question mark): /* problem7.c */ #include cunistd.h> int main(void) { char buffer = 'W'; open("filel", 2); open("file2",2); 1seek (3, ?,1); write(3,8buffer, 1); 1seek(4, -2,2); write(4, 8buffer, 1); read (e, &buffer, 1); write(4,8buffer, 1); 1seek(3, -3,2); write(3, &buffer, 1); write(4, "\n", 1); 1seek(4,1,0); write(4, &buffer, 1); close(3); close(4); Without a further header file compilation will produce a warning, but this will not affect this problem. When you enter a certain character and the single question mark is replaced with an appropriate number cat filel produces: gxi and cat file2 produces: gxWx What is that number and what is that character? The single question mark (?) should be replaced with:
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