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Command: etext | Section: 5 | Source: Digital UNIX | File: etext.5.gz
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NAME
end, etext, edata - Defines the last location of a program
SYNOPSIS
extern end; extern etext; extern edata;
DESCRIPTION
The external names end, etext, and edata are defined for all programs.
They are not functions, but identifiers associated with the following
addresses: The first address following the program text. The first ad-
dress following the initialized data region. The first address follow-
ing the data region that is not initialized.
The break value of the program is the first location beyond the data.
When a program begins running, this location coincides with end. How-
ever, many factors can change the break value, including: The brk()
function The malloc() function The standard I/O functions The -p flag
on the cc command
Therefore, use sbrk(0), not end, to determine the break value of the
program.
SEE ALSO
Functions: brk(2), malloc(3)
Commands: cc(1)
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