01-20-2010
From the man page of strcat (emphasis added)
Quote:
The strcat() function appends the src string to the dest string, overwriting the null byte ('\0') at the end of dest, and then adds a terminating null byte. The strings may not overlap, and the dest string must have enough space for the result.[...]
If src contains n or more characters, strcat() writes n+1 characters to dest (n from src plus the terminating null byte). Therefore, the size of dest must be at least strlen(dest)+n+1.
So as soon as you read more that 512 bytes from the process (which, with netstat will happen almost guaranteed) you'll start trying to write into unreserved space. This space might already be claimed by another process, and so the system intervenes.
One approach might be to allocate a large enough part of memory at the beginning.
A better approach would be to allocate a bit of memory using malloc(), and expanding that if needed using realloc().
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LEARN ABOUT OSX
term_send
term::send(n) Terminal control term::send(n)
__________________________________________________________________________________________________________________________________________________
NAME
term::send - General output to terminals
SYNOPSIS
package require Tcl 8.4
package require term::send ?0.1?
::term::send::wrch chan str
::term::send::wr str
_________________________________________________________________
DESCRIPTION
This package provides the most primitive commands for sending characters to a terminal. They are in essence convenient wrappers around the
builtin command puts.
::term::send::wrch chan str
Send the text str to the channel specified by the handle chan. In contrast to the builtin command puts this command does not termi-
nate the string with a line terminator. It also forces an flush of Tcl internal and OS buffers to ensure that the characters are
processed immediately.
::term::send::wr str
This convenience command is like ::term::send::wrch, except that the destination channel is fixed to stdout.
BUGS, IDEAS, FEEDBACK
This document, and the package it describes, will undoubtedly contain bugs and other problems. Please report such in the category term of
the Tcllib SF Trackers [http://sourceforge.net/tracker/?group_id=12883]. Please also report any ideas for enhancements you may have for
either package and/or documentation.
KEYWORDS
character output, control, terminal
CATEGORY
Terminal control
COPYRIGHT
Copyright (c) 2006 Andreas Kupries <andreas_kupries@users.sourceforge.net>
term 0.1 term::send(n)