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) Standards, Environments, and Macros prof(5)
NAME
prof - profile within a function
SYNOPSIS
#define MARK
#include <prof.h>
void MARK(name);
DESCRIPTION
MARK introduces a mark called name that is treated the same as a function entry point. Execution of the mark adds to a counter for that
mark, and program-counter time spent is accounted to the immediately preceding mark or to the function if there are no preceding marks
within the active function.
name may be any combination of letters, numbers, or underscores. Each name in a single compilation must be unique, but may be the same as
any ordinary program symbol.
For marks to be effective, the symbol MARK must be defined before the header prof.h is included, either by a preprocessor directive as in
the synopsis, or by a command line argument:
cc -p -DMARK work.c
If MARK is not defined, the MARK(name) statements may be left in the source files containing them and are ignored. prof -g must be used
to get information on all labels.
EXAMPLES
In this example, marks can be used to determine how much time is spent in each loop. Unless this example is compiled with MARK defined on
the command line, the marks are ignored.
#include <prof.h>
work( )
{
int i, j;
. . .
MARK(loop1);
for (i = 0; i < 2000; i++) {
. . .
}
MARK(loop2);
for (j = 0; j < 2000; j++) {
. . .
}
}
SEE ALSO
profil(2), monitor(3C)
SunOS 5.10 3 Jul 1990 prof(5)