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Full Discussion: C system() how to send the output to an array??
Top Forums Programming C system() how to send the output to an array?? Post 302388288 by pludi on Wednesday 20th of January 2010 02:17:36 AM
Old 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 DEBIAN

term_send

term::send(3tcl)						 Terminal control						  term::send(3tcl)

__________________________________________________________________________________________________________________________________________________

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(3tcl)
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