09-13-2007
Question about several things in C
Hey guys, first of all I'd like to say Hi to everyone. I am new here and this is my first post.
I have a question about some C stuff. I am in Computer Science and I have an assignment for a UNIX Applications course. It is really complicated, however.
We're using the C language for this and this is my first time using it(I have used C++ before and theres not really any major differences, as far as I know).
Our prof has asked us to examine disk files in hex. He wants us to write a program that will be used as a command with several options. First, I remember we could easily use getopts to handle options in Bash. Is there a similar command for C?
Then he wants us to display the relative offset from the start of a file. Is there a command for that too? I can't find anything in my textbooks and any help would be appreciated.
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prof(5) File Formats Manual prof(5)
Name
prof - profile within a function
Syntax
#define MARK
#include <prof.h>
void MARK (name)
Description
The symbol produces a mark called name that is treated the same as a function entry point. Execution of the mark increments the counter
for that mark, and the program-counter time spent is accounted to the preceding mark or to the function if a preceding mark is not within
the active function.
The name argument can be any combination of numbers or underscores. Each name in a single compilation must be unique, but can be the same
as any ordinary program symbol.
For marks to be effective, the symbol must be defined before the header file is included. This may be defined by a preprocessor directive
as in the synopsis, or by a command line argument. For example:
cc -p -DMARK foo.c
If is not defined, the statements may remain in the source files, but they will be ignored.
Examples
In the following example, marks are used to determine how much time is spent in each loop. Unless the example is compiled with defined on
the command line, the marks are ignored:
#include <prof.h>
foo( )
{
int i, j;
.
.
.
MARK(loop1);
for (i = 0; i < 2000; i++) {
. . .
}
MARK(loop2);
for (j = 0; j < 2000; j++) {
. . .
}
}
See Also
prof(1), profil(2), monitor(3c)
RISC prof(5)